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Wetland and Stream Assessment Report
I-405, Renton to Bellevue Corridor
Milepost 4.0 – 13.7
Renton, WA
Bellevue, WA
King County, WA
Prepared by
I-405/SR 167 Corridor Program
July 2017
I-405 Wetland and Stream Assessment Report Page 1
TABLE OF CONTENTS
TABLE OF CONTENTS .............................................................................................................. 1
LIST OF TABLES ........................................................................................................................ 1
LIST OF FIGURES ..................................................................................................................... 3
INTRODUCTION ........................................................................................................................ 4
Study Area ................................................................................................................................. 4
METHODS .................................................................................................................................. 6
Wetland Delineation ................................................................................................................. 6
Wetland Classification and Rating ......................................................................................... 6
Stream Assessment ................................................................................................................. 6
Buffer Assessment ................................................................................................................... 6
EXISTING CONDITIONS ............................................................................................................ 7
Landscape Setting ................................................................................................................... 7
Wetlands .................................................................................................................................... 8
Streams .................................................................................................................................... 68
Sensitive Plants, Fish, and Wildlife ..................................................................................... 76
REFERENCES ......................................................................................................................... 78
APPENDIX A – Existing Conditions Plan Sheets ........................................................................ 1
APPENDIX B – Wetland Delineation Data Sheets ....................... Error! Bookmark not defined.
APPENDIX C – Wetland Rating Forms ........................................ Error! Bookmark not defined.
LIST OF TABLES
Table 1. Wetland Summary ......................................................................................................... 9
Table 2. Wetland 4.1R-NJ Summary ......................................................................................... 11
Table 3. Wetland 4.9R Summary .............................................................................................. 12
Table 4. Wetland 4.53R Summary ............................................................................................ 13
Table 5. Wetland 4.95L Summary ............................................................................................. 14
Table 6. Wetland 5.0R Summary .............................................................................................. 15
Table 7. Wetland 5.1R Summary .............................................................................................. 16
Table 8. Wetland 5.4L Summary ............................................................................................... 17
Table 9. Wetland 5.36L Summary ............................................................................................. 18
Table 10. Wetland 5.37L Summary ........................................................................................... 19
Table 11. Wetland 5.38L Summary ........................................................................................... 20
Table 12. Wetland 5.39L Summary ........................................................................................... 21
Table 13. Wetland 7.2 R Summary ........................................................................................... 22
Table 14. Wetland 7.3 R Summary ........................................................................................... 23
Table 15. Wetland 7.5L Summary ............................................................................................. 24
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Table 16. Wetland 7.8L Summary ............................................................................................. 25
Table 17. Wetland 7.35R Summary .......................................................................................... 26
Table 18. Wetland 7.42R Summary .......................................................................................... 27
Table 19. Wetland 7.44L Summary ........................................................................................... 28
Table 20. Wetland 7.78L Summary ........................................................................................... 29
Table 21. Wetland 7.79L Summary ........................................................................................... 30
Table 22. Wetland 7.82R Summary .......................................................................................... 31
Table 23. Wetland 7.83R Summary .......................................................................................... 32
Table 24. Wetland 7.84R Summary .......................................................................................... 33
Table 25. Wetland 8.2L Summary ............................................................................................. 34
Table 26. Wetland 8.2R Summary ............................................................................................ 35
Table 27. Wetland 8.4L Summary ............................................................................................. 36
Table 28. Wetland 8.05R Summary .......................................................................................... 37
Table 29. Wetland 8.2L Summary ............................................................................................. 38
Table 30. Wetland 8.5L Summary ............................................................................................. 39
Table 31. Wetland 8.6R Summary ............................................................................................ 40
Table 32. Wetland 8.44L Summary ........................................................................................... 41
Table 33. Wetland 8.75L Summary ........................................................................................... 42
Table 34. Wetland 8.8L Summary ............................................................................................. 43
Table 35. Wetland 9.5L Summary ............................................................................................. 44
Table 36. Wetland 9.68L Summary ........................................................................................... 45
Table 37. Wetland 9.82L Summary ........................................................................................... 46
Table 38. Wetland 10.0L Summary ........................................................................................... 47
Table 39. Wetland 10.01R Summary ........................................................................................ 48
Table 40. Wetland 10.05R Summary ........................................................................................ 49
Table 41. Wetland 10.9L Summary ........................................................................................... 50
Table 42. Wetland 10.16L Summary ......................................................................................... 51
Table 43. Wetland 10.25LA Summary ....................................................................................... 53
Table 44. Wetland 10.25LB Summary ....................................................................................... 54
Table 45. Wetland 10.8L Summary ........................................................................................... 55
Table 46. Wetland 118-1 Summary ........................................................................................... 56
Table 47. Wetland 118-2 Summary ........................................................................................... 58
Table 48. Wetland 118-3 Summary ........................................................................................... 60
Table 49. Wetland 118-4 Summary ........................................................................................... 62
Table 50. Wetland 12.45M Summary ........................................................................................ 63
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Table 51. Wetland 12.82R Summary ........................................................................................ 65
Table 52. Wetland 13.0R Summary .......................................................................................... 66
Table 53. Wetland 13.25R Summary ........................................................................................ 67
Table 54. Stream Summary ...................................................................................................... 68
Table 55. Johns Creek Summary .............................................................................................. 69
Table 56. May Creek Summary ................................................................................................. 70
Table 57. UNT.08.LW.0283 Summary ...................................................................................... 71
Table 58. Stream 7.7a Summary .............................................................................................. 72
Table 59. Stream 7.8 Summary ................................................................................................ 73
Table 60. Coal Creek Summary ................................................................................................ 74
Table 61. Median Creek Summary ............................................................................................ 75
Table 62. Sturtevant Creek Summary ....................................................................................... 76
LIST OF FIGURES
Figure 1. Study Area ................................................................................................................... 5
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INTRODUCTION
This assessment provides the baseline conditions of wetlands, streams, and associated buffers
within the Interstate 405 (I-405) corridor from milepost 4.0 to 13.7. This information will be used
to support projects funded by the Connecting Washington funding package, and any future
funding. The programmed work on the corridor includes widening for two additional lanes in each
direction, expansion of the I-405 Express Toll Lanes system, stormwater treatment and retrofit,
and fish passage. Construction is anticipated to occur between 2019 and 2024.
Study Area
The area examined for wetlands, streams, and associated buffers is referred to as the study area
and it includes all potential areas impacted by the upcoming projects, which are the I-405, Renton
to Bellevue Project (Stage 1), and the I-405, I-90 to NE 6th Improvement Project. The study area
is limited to the current WSDOT right-of-way (ROW) and proposed new ROW for the upcoming
construction stages. Generally, this was within 300 feet of the existing I-405 alignment,
interchanges, on-off ramps, adjacent park-and-rides, the Eastside Rail Corridor, and 118th Ave
SE in Bellevue. Many of the wetlands within the study area had been previously delineated or
identified through other means. The current assessment supersedes all previous documentation
of these wetlands, as they were not all field verified, and those that were, were delineated prior to
publication of the U.S. Army Corps of Engineers Delineation Manual: Western Mountains, Valleys,
and Coasts Regional Supplement (Version 2.0) (USACE 2010). Figure 1 shows the I-405
alignment from milepost 4.0 to 13.7.
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Figure 1. I-405 Alignment
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METHODS
Wetland Delineation
The corridor has been studied extensively as part of the I-405, Renton to Bellevue Project, and
the I-405, South Bellevue Project. Wetland delineations from previous studies required
verification, because they were greater than five years old, and could not be used to support
current or future project permits. Some new study areas were identified that were not included in
previous documentation. Specifically, along 118th Ave SE between Mercer Slough and I-405 in
south Bellevue, and along the Eastside Rail Corridor from Ripley Lane in Renton to Coal Creek
Parkway in Bellevue. The Eastside Rail Corridor is located between I-405 and Lake Washington
in this area.
The wetland verifications and new delineations were conducted using observable vegetation,
hydrology, and soil indicators. Data points were collected in each wetland and adjacent upland
using the routine methods described in the U.S. Army Corps of Engineers Wetlands Delineation
Manual (Environmental Laboratory 1987) and the U.S. Army Corps of Engineers Wetlands
Delineation Manual: Western Mountains, Valleys, and Coasts Regional Supplement (Version 2.0)
(USACE 2010). A wetland/non-wetland determination was made for each examined area based
on field data collected by walking the study area and in-field review of previously documented
wetland boundaries. Boundaries of wetlands occurring within the study area were either
determined to be correct as previously mapped or modifications to wetland boundaries were made
based on conditions observed at the time. When changes to boundaries were necessary, a
modified wetland boundary was flagged in the field. Wetland and upland sample point locations,
as well as revised or newly identified wetland boundaries, were surveyed by a WSDOT survey
crew.
Wetland Classification and Rating
The wetlands were classified using the US Fish and Wildlife Service (USFWS) classification
system (Cowardin, Carter, Golet and others 1979) and the Hydrogeomorphic Classification
system (HGM) (Brinson 1993). Wetlands were rated using the Washington State Wetland Rating
System for Western Washington, 2014 Update (Hruby 2014). The local jurisdictions occurring
within the corridor require the use of the Ecology rating system to classify wetlands.
Stream Assessment
A field review of the ordinary high-water marks of each stream was conducted and streams were
flagged and surveyed.
Buffer Assessment
Buffers only include vegetated areas outside of the developed road prism. Existing structures
such as managed road embankments, buildings, and paved or impervious surfaces do not provide
functions for adjacent aquatic resources, and were excluded from buffers. Most of the wetland
and stream buffers in the project area are limited in width and function due to adjacent structures
and paved surfaces.
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EXISTING CONDITIONS
Landscape Setting
The project is located in the Lake Washington watershed, which comprises 13 major drainage
sub-basins and numerous smaller drainages, totaling approximately 656 miles of streams, two
major lakes, and numerous smaller lakes. Lake Washington and its major drainages (Issaquah
Creek, the Sammamish River, and the Cedar River) are located in the Cedar-Sammamish
Watershed Basin, or W ater Resource Inventory Area (WRIA) 8. The majority of the watershed is
highly developed, with 63 percent of the watershed fully developed; WRIA 8 has the highest
human population of any WRIA in Washington State (NMFS 2008). Lake Washington is the
second largest natural lake in Washington with 80 miles of shoreline. The lake is approximately
20 miles long with a mean width of approximately 1.5 miles, has a circumference of 50 miles,
covers 22,138 surface acres, and has a mean depth of approximately 100 feet and a maximum
depth of approximately 200 feet (Jones and Stokes 2005).
The Lake Washington watershed has been dramatically altered in the 165 years since the first
Euro-American settlers arrived in the Seattle area (Kerwin 2001). This started with heavy logging
of old growth forest in the 19th Century. It expanded at the turn of the 20th Century, when Seattle
tapped the Cedar River as its main source of water supply. A major alteration of the watershed
occurred in the decade of 1910-20, when the Lake Washington Ship Canal and Hiram M.
Chittenden Locks were completed. The ecological consequences of this last alteration were
profound. The outlet of Lake Washington was redirected from its south end, at the Black River, to
a new outlet at the Locks providing an abrupt transition from freshwater to saltwater, which had
almost no features of a natural estuary. In addition, the level of Lake Washington dropped
approximately 9 feet, which drained wetlands along much of its shoreline and dramatically
changed its confluences with tributaries. In a separate but related action in the same decade, the
Cedar River was redirected from its normal connection with the Black River, which fed the
Duwamish, and was channelized to flow into Lake Washington, with the initial hope of creating a
major freshwater industrial port at Renton. Lowering Lake Washington also lowered Lake
Sammamish and drained the vast wetland complex that had made up the Sammamish River
Corridor between the lakes. This provided the basis for a major expansion of farming in the
corridor, which led to channelization of the Sammamish River to nearly its present course in the
early 1920s. Thus, by the 1920s, the general hydrogeography of today's watershed was
established.
In the ensuing years, the most important cause of physical change to the watershed has been the
expansion of urban and suburban development. In particular, this has altered the hydrology of the
watershed; both through changes in land cover and through increased water withdrawals.
Changes in land cover due to urbanization have been extensively shown to relate to degradations
in salmon habitat, mostly due to changes in flows, but also because of degraded riparian areas.
The removal of forest cover for urban and suburban development dramatically increases the size
and frequency of high flows from stormwater in lowland creeks. It also reduces low flows in the
summer and early fall, because cleared land and impervious surfaces dramatically reduces
groundwater recharge. Increased water withdrawals through the 1950s were primarily from
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Seattle's Cedar River Watershed, but total withdrawals from the watershed have been relatively
stable since then, as Seattle and the region have developed other supplies. Major withdrawals in
the watershed since then have been from groundwater below the lower Cedar River, lower
Issaquah Creek, lower Bear Creek and Rock Creek (a tributary to the Cedar River).
Following significant floods in the 1950s, countywide flood control efforts in the 1960s led to a
dramatic expansion of levees on the Cedar River and local sponsorship of major dredging and
levee construction on the Sammamish River by the Corps of Engineers. This supported greater
human development in the floodplains of both rivers. Meanwhile, expanding urbanization led to
heavy residential development of the shorelines of Lake Washington and Lake Sammamish. The
nearshore of WRIA 8 was even more dramatically affected by the construction of a railroad line
along most of its length early in the century.
Wetlands
There is a wide variety of wetland types of various quality found within the study area. Many are
small roadside ditches with little species diversity beyond erosion control grasses and invasive
plants. Most of the wetlands in the corridor receive runoff through ditches and drainage pipes off
of developed areas, as well as natural sources including groundwater, seeps, and springs. The
most diverse and highest quality wetlands are found around Coal Creek, the larger wetlands
around Gypsy Creek and the Mercer Slough wetland adjacent to I-90. A summary of wetland
hydrogeomorphic (HGM) classes, ratings, and sizes is provided in Table 1.
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Table 1. Wetland Summary
Wetland HGM Class Rating Buffer
Width
Cowardin
Classification Size (ft2) Size (acres)
4.1 R-NJ slope IV 40 PEM 218 0.005
4.53 R depressional IV 40 PSS 436 0.01
4.9R slope IV 40 PEM 300 0.007
5.00R slope IV 40 PEM 900 0.021
5.1R depressional IV 40 PFO 2,400 0.055
5.36L slope IV 40 PEM/PSS 3,700 0.085
5.37L slope IV 40 PEM/PSS 5,300 0.122
5.38L depressional IV 40 PEM/PFO 11,400 0.262
5.39L depressional IV 40 PEM 2,600 0.060
5.4L slope III 75 PSS 700 0.016
7.2R depressional III 75 PFO 223,500 5.131
7.3R depressional IV 40 PFO 21,052 0.483
7.35R depressional IV 40 PEM 12,077 0.277
7.42R depressional III 75 PEM 7,259 0.167
7.5L depressional III 75 PSS 12,059 0.277
7.66R depressional III 75 PSS, PEM 21,943 0.504
7.78L depressional III 75 PEM/PSS/PFO 30,349 0.697
7.44L depressional IV 40 PSS 2,965 0.068
7.79L depressional IV 40 PSS/PEM 4,398 0.101
7.8L depressional IV 40 PEM 2,842 0.065
7.82R slope IV 40 PSS/PFO 16,299 0.374
7.84R slope IV 40 PEM/PFO 29,076 0.667
8.05R slope IV 40 PEM/PFO 2,154 0.049
8.2L depressional IV 50 PEM 369 0.008
8.2R slope IV 40 PEM 1,200 0.028
8.4L depressional IV 40 PEM 700 0.016
8.44L slope IV 40 PEM 4,700 0.108
8.5L slope IV 40 PEM 200 0.005
8.6R depressional IV 40 PEM 600 0.014
8.75L depressional IV 40 PEM 2,200 0.050
8.8L depressional IV 40 PEM/PFO 3,100 0.071
9.2R riverine IV 40 PSS 5,200 0.119
9.30R depressional III 75 PEM 11,100 0.255
9.32R depressional III 75 PEM 1,600 0.037
9.5L depressional IV 40 PEM 872 0.020
9.68L depressional III 75 PEM 4,400 0.101
9.82L depressional III 75 PEM/PFO 4,000 0.092
10.0L depressional III 75 PSS 15,000 0.344
10.01R depressional III 75 3,500 0.080
10.16L depressional III 75 PSS 6,000 0.138
10.25L-A slope IV 40 PEM 1,000 0.023
10.25L-B slope IV 40 PEM/PFO 8,800 0.202
10.8L depressional II 115 PEM/PSS/PFO 1,790,000 41.093
118-1 depressional III 75 PEM 3,049 0.070
118-2 depressional IV 40 PEM 1,306 0.030
118-3 depressional IV 40 PEM 2,178 0.050
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Wetland HGM Class Rating Buffer
Width
Cowardin
Classification Size (ft2) Size (acres)
118-4 depressional IV 40 PEM/PSS 6,621 0.152
10.90L depressional IV 40 PSS 3,200 0.073
12.45M slope II 60 PEM/PSS/PFO 74,052 1.701
12.82 R depressional IV 40 PEM 2,651 0.061
13.0 R depressional IV 40 PEM 1,001 0 .023
13.25R depressional III PSS, PEM 8,300 0.191
Details of the conditions of each wetland and the rationale for delineations are provided in the
following summary tables.
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Table 2. Wetland 4.1R-NJ Summary
WETLAND 4.1R-NJ – INFORMATION SUMMARY
Location: Latitude 47.484463, Longitude -122.194123
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.005 acre
Cowardin
Classification PEM
HGM Classification Slope
Wetland Data Sheet(s) SP 4.1R-NJ-W
Upland Data Sheet (s) SP 4.1R-NJ-U
Flag color N/A
Dominant
Vegetation
Wetland 4.1R-NJ is dominated by an emergent vegetation community of reed
canarygrass (Phalaris arundinaceae). Some Himalayan blackberry (Rubus
armeniacus) are also present.
Soils
Soils in Wetland 4.1R-NJ consist of 10 inches of very dark gray (10YR 3/1) loamy sand
over at least 6 inches of dark gray (Gley1 4/10Y) loamy sand. Sulfidic odor was also
present within 10 inches of the soil profile. Soils in Wetland 4.1R-NJ meets hydric soil
indicators for a Hydrogen Sulfide (A4) and a Loamy Gleyed Matrix (F2).
Hydrology Soils were saturated to the surface with a water table of 9 inches deep. Groundwater
discharge from hillside seeps is the primary sources of hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 4.1R-NJ were verified
with a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 4.1R-NJ is rated Category IV using the Ecology rating system because it
provides moderate water quality (6) and hydrologic (6) functions and low habitat (3)
functions, scoring 15 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 4.1R-NJ has moderate potential to improve water quality functions as it has
over 90 percent of dense, uncut, herbaceous plants. Roadway runoff to the wetland
provides moderate potential for the wetland to support water quality functions. Wetland
4.1R-NJ is located in the Lower Cedar River basin, and the Cedar River is on the
303(d) list.
Hydrologic
Wetland 4.1R-NJ has moderate potential to reduce flooding and erosion due to the
presence of over 90 percent of dense, uncut, rigid plants. Roadway runoff adjacent to
the wetland provides moderate potential for the wetland to support hydrologic
functions.
Habitat
Wetland 4.1R-NJ has low potential to provide habitat functions due to its size and
location in the landscape. Limited accessible habitat is present since it is surrounded
by paved roadways. Wetland 4.1R-NJ exhibits low species diversity and no
interspersion of habitats.
Buffer
Condition
The buffers adjoining Wetland 4.1R-NJ is dominated by Himalayan blackberry. Herb-
Robert (Geranium robertianum), common St. Johnswort (Hypericum perforatum),
creeping bentgrass (Agrostis stolonifera), and orchard grass (Dactylis glomerata) are
also present. The buffer west of Wetland 4.1R-NJ is cut off by I-405 off-ramp.
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Table 3. Wetland 4.9R Summary
WETLAND 4.9R – INFORMATION SUMMARY
Location: Latitude 47.496273, Longitude -122.193545
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 50
Wetland Size 0.01
Cowardin
Classification PEM
HGM Classification Slope
Wetland Data Sheet(s) SP 4.9R-W
Upland Data Sheet (s) SP 4.9R-U
Flag color N/A
Dominant
Vegetation
Wetland 4.9R is dominated by an emergent vegetation community with reed
canarygrass and giant horsetail (Equisetum telmateia).
Soils
Soils in Wetland 8.1R consist of 4 inches of very dark grayish brown (10YR 3/2) silt
loam and 15 inches of dark grayish brown (10YR 4/2) sandy loam with redoximorphic
features. Sulfidic odor was present at 11 inches below the surface. Wetland 8.1R
meets hydric soil indicators for a Hydrogen Sulfide (A4) and a Depleted Matrix (F3).
Hydrology
Soils were saturated to the surface, and water table was present at 10 inches in the
soil pit. Groundwater discharge from hillside seeps is the primary source of wetland
hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 4.9R were delineated
where indicators of wetland vegetation, hydric soil and wetland hydrology were
present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 4.9R is rated Category IV using the Ecology rating system because the
wetland provides moderate water quality (5) functions and low hydrologic (4) and
habitat (3) functions, scoring 12 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 4.9R has moderate potential to improve water quality due to lack of retention
areas and lack of dense, uncut herbaceous plants. I-405 next to the wetland provides
moderate potential to support the water quality functions. Wetland 4.9R lacks an outlet
and does not discharge into any water bodies.
Hydrologic
Wetland 4.9R has moderate potential to reduce flooding and erosion because it has
over 90 percent of dense, uncut, rigid plants. However, upslope land uses are
vegetated and are not likely to generate excess surface runoff, resulting in low
potential to support the hydrologic functions of the wetland
Habitat
Wetland 4.9R has low potential to provide habitat for wildlife due to its size, low
species diversity, and no habitat interspersion. Accessible habitat and undisturbed
habitat are limited around the wetland due to the surrounding land uses.
Buffer
Condition
The vegetated portion of the buffer is located east of Wetland 4.9R as I-405 cuts off
the western portion of the buffer. The vegetated buffer is dominated by Himalayan
blackberry, tall fescue (Schedonorus arundinaceus), and giant horsetail.
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Table 4. Wetland 4.53R Summary
WETLAND 4.53R – INFORMATION SUMMARY
Location: Latitude 47.491144, Longitude -122.191154
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.06 acres
Cowardin
Classification PSS
HGM Classification Depressional
Wetland Data Sheet(s) SP 4.53R-W
Upland Data Sheet (s) SP 4.53R-U
Flag color N/A
Dominant
Vegetation
Wetland 4.53R is dominated by a scrub-shrub vegetation community that consists of
Himalayan blackberry, weeping willow (Salix babylonia), paper birch (Betula
papyrifera), and English hawthorn (Crataegus monogyna). Soft rush (Juncus effusus)
and tall buttercup (Ranunculus acris) are also present in the wetland.
Soils
Soils in Wetland 4.53R consist of 9 inches of very dark grayish brown (10YR 3/2)
sandy loam over at least 7 inches of grayish brown (2.5Y 5/2) sandy loam with
redoximorphic features. Compacted gravel is present below 16 inches. Soils in
Wetland 4.53R meet hydric soil indicator for a Depleted Matrix (F3).
Hydrology
No soil saturation was observed at the sample plot; however, saturation was observed
at 6 inches below the soil surface approximately 20 feet south of the sample plot within
the wetland. The primary sources of hydrology include groundwater and stormwater
runoff from adjacent roadway.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 4.53R were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 4.53R is rated Category IV using the Ecology rating system because it
provides moderate water quality (5) functions and low hydrologic (4) and habitat (3)
functions, scoring 12 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 4.53R has moderate potential to improve water quality as it is vegetated with
dense ungrazed vegetation and has an intermittently flowing outlet at the north end of
the wetland. Roadway runoff to the wetland provides moderate potential to support
water quality functions.
Hydrologic
Wetland 4.53R has low potential to reduce flooding and erosion as the wetland has
minimal storage capacity available. Roadway runoff to the wetland provide moderate
potential to support hydrologic functions.
Habitat
Wetland 4.53R has low potential to provide habitat for wildlife as it has low vegetation
structure and no habitat interspersion. Due to its location and surrounding land uses,
accessible habitat and undisturbed habitat around this wetland are limited.
Buffer
Condition
The buffer adjoining Wetland 4.53R is dominated by Himalayan blackberry, western
red cedar (Thuja plicata), and Douglas fir (Pseudotsuga menziesii). Southern and
western portions of the buffer are less than 50 feet wide as SR 900 and I-405 off-ramp
cut off the buffer.
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Table 5. Wetland 4.95L Summary
WETLAND 4.95L – INFORMATION SUMMARY
Location: Latitude 47.496235, Longitude -122.194649
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.19 acres
Cowardin
Classification PSS
HGM Classification Depressional
Wetland Data Sheet(s) SP 4.95L-W
Upland Data Sheet (s) SP 4.95L-U
Flag color N/A
Dominant
Vegetation
Wetland 4.95L is composed of a scrub-shrub vegetation community that consists of
salmonberry (Rubus spectabilis), Pacific willow (Salix lasiandra), and red-osier
dogwood (Cornus alba) with an understory of slough sedge (Carex obnupta).
Soils
Soils in Wetland 4.95L consist of 10 inches of peat and 8 inches of dark greenish gray
(Gley1 4/10Y) sandy loam. Wetland 4.95L meets hydric soil indicators for a Histic
Epipedon (A2) and a Loamy Gleyed Matrix (F2).
Hydrology
Soils were saturated to the surface with a water table of 7 inches deep. Approximately
1.5 inches of surface water was present 5 feet south from the soil pit. The primary
sources of hydrology include a high groundwater table and stormwater runoff from
Houser Way.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 4.95L were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 4.95L is rated Category IV using the Ecology rating system because it
provides moderate water quality (6) and hydrologic (6) functions and low habitat (3)
functions, scoring 15 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 4.95L has moderate potential to improve water quality since it has an organic
soil layer, an intermittently flowing ditch, and over 50 percent of seasonally ponding
area. Surrounding land uses provide high potential to support the water quality
functions of this wetland. Trash was observed in the wetland as this wetland is located
immediately adjacent to Houser Way where factory employees and truck drivers park
along the street.
Hydrologic
Wetland 4.95L has moderate potential to reduce flooding and erosion due to the
presence of an intermittently flowing ditch and its smaller contributing basin. Roadways
near the wetland provide high potential to support hydrologic functions.
Habitat
Wetland 4.95L has low potential to provide habitat for wildlife because it exhibits low
species diversity and interspersion of habitats. Accessible habitat and undisturbed
habitat are limited around the wetland due to the surrounding land use.
Buffer
Condition
The buffer west of Wetland 4.95L is cut off by Houser Way. The remaining portion of
the buffer is dominated by black cottonwood (Populus balsamifera) red alder (Alnus
rubra) trees with western red cedar saplings and Himalayan blackberry.
I-405 Wetland and Stream Assessment Report Page 15
Table 6. Wetland 5.0R Summary
WETLAND 5.0R – INFORMATION SUMMARY
Location: Latitude 47.497812, Longitude - -122.194411
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40
Wetland Size 0.02
Cowardin
Classification PEM
HGM Classification Slope
Wetland Data Sheet(s) SP 5.0R-W
Upland Data Sheet (s) SP 5.0R-U
Flag color N/A
Dominant
Vegetation
Wetland 5.0R is dominated by an emergent vegetation community with reed
canarygrass, broad-leaf cattail (Typha latifolia), and soft rush.
Soils
Soils in Wetland 5.0R consist of 7 inches of dark gray (10YR 4/1) sandy loam with
redoximorphic features and 6 inches dark gray (Gley1 4/10N) sandy loam with
redoximorphic features. Wetland 5.0R meets hydric soil indicators for a Loamy Gleyed
Matrix (F2) and a Depleted Matrix (F3).
Hydrology
Soils were saturated to the surface, and surface water was also present near the soil
pit. Groundwater discharge from hillside seeps is the primary source of wetland
hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 5.0R were delineated
where indicators of wetland vegetation, hydric soil and wetland hydrology were
present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 5.0R is rated Category IV using the Ecology rating system because the
wetland provides low water quality (4), hydrologic (3), and habitat (3) functions, scoring
10 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 5.0 R has low potential to improve water quality due to lack of retention areas
and dense, uncut herbaceous plants. However, runoff from I-405 next to the wetland
provides moderate potential to support the water quality functions. Wetland 5.0R lacks
an outlet and does not discharge into any water bodies.
Hydrologic
Wetland 5.0R has low potential to reduce flooding and erosion due to lack of dense,
uncut, rigid plants. Upslope land uses are vegetated and are not likely to generate
excess surface runoff, resulting in low potential to support the hydrologic functions of
the wetland.
Habitat
Wetland 5.0R has low potential to provide habitat for wildlife due to its size, low
species diversity, and lack of habitat interspersion. Accessible habitat and undisturbed
habitat are limited around the wetland due to the surrounding land uses.
Buffer
Condition
The vegetated portion of the buffer is located east of Wetland 5.0R as I-405 cuts off
the western portion of the buffer. The vegetated buffer is dominated by Himalayan
blackberry, tall fescue, and creeping bentgrass.
I-405 Wetland and Stream Assessment Report Page 16
Table 7. Wetland 5.1R Summary
WETLAND 5.1R – INFORMATION SUMMARY
Location: Latitude 47.498448, Longitude -122.194551
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40
Wetland Size 0.04
Cowardin
Classification PFO
HGM Classification Depressional
Wetland Data Sheet(s) SP 5.1R-W
Upland Data Sheet (s) SP 5.1R-U
Flag color N/A
Dominant
Vegetation
Wetland 5.1R is dominated by a forested vegetation community that consists of red
alder and black cottonwood with an understory of reed canarygrass, skunk cabbage
(Lysichiton americanus), field bindweed (Convolvulus arvensis), and tall managrass
(Glyceria elata). Some Himalayan blackberry is also present.
Soils
Soils in Wetland 5.1R consist of 10 inches of dark gray (10YR 4/1) sandy loam and 9
inches of dark gray (2.5Y 4/1) loamy sand. Sulfidic odor was present at 10 inches
below the soil surface. Wetland 5.1R meets hydric soil indicators for a Hydrogen
Sulfide (A4).
Hydrology
Soils were saturated to the surface, and water table was present at 8 inches in the soil
pit. A drainage runs along the eastern boundary of the wetland. Primary sources of
wetland hydrology include a high-water table and overbank flooding from the drainage
way.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 5.1R were delineated
where indicators of wetland vegetation, hydric soil and wetland hydrology were
present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 5.1R is rated Category IV using the Ecology rating system because it provides
moderate water quality (5) and low hydrologic (4) and habitat (4) functions, totaling 13
points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 5.1R has moderate potential to improve water quality due to the presence of
slightly constricted outlet, over 95 percent of persistent ungrazed plants, and over 25
percent of seasonally ponding area. I-405 next to the wetland provides moderate
potential to support the water quality function of the wetland. Wetland 5.1R discharges
into the drainage way, bypasses I-405 via a 16-inch culvert, and discharges into
Renton’s stormwater system on the east side of I-405.
Hydrologic
Wetland 5.1R has low potential to reduce flooding and erosion because it has shallow
live storage available and has a larger contributing basin. Surrounding land uses
provide moderate potential to support hydrologic functions of the wetland.
Habitat
Wetland 5.1R has low potential to provide habitat for wildlife due to its size, low
species diversity, and lack of habitat interspersion. Limited accessible habitat and
undisturbed habitat in one kilometer of the wetland are present. However, the drainage
way running along Wetland 5.1R provides a moderate value to this wetland.
Buffer
Condition
The buffers adjoining Wetland 5.1R is dominated by Himalayan blackberry, giant
horsetail, big-leaf maple (Acer macrophyllum), Norway maple (Acer platanoides),
sword fern (Polystichum munitum), and common snowberry (Symphoricarpos albus).
The buffer west of Wetland 5.1R is less than 50 feet wide as it is cut off by I-405.
I-405 Wetland and Stream Assessment Report Page 17
Table 8. Wetland 5.4L Summary
WETLAND 5.4L – INFORMATION SUMMARY
Location: Latitude 47.502787, Longitude -122.198119
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.02 acres
Cowardin
Classification PEM
HGM Classification Slope
Wetland Data Sheet(s) SP 5.4L-W
Upland Data Sheet (s) SP 5.4L-U
Flag color N/A
Dominant
Vegetation
Wetland 5.4L is dominated by an emergent vegetation community that consists of soft
rush (Juncus effusus), baltic rush (Juncus balticus), and creeping bentgrass. Black
cottonwood saplings and Himalayan blackberry are also present in the wetland.
Soils
Soils in Wetland 5.4L consists of 6 inches of very dark grayish brown (10YR 3/2) sandy
loam and 12 inches of dark gray (2.5Y 4/1) with redoximorphic features. The second
layer is compacted and appears to be disturbed. Soils in Wetland 5.4L meets hydric
soil indicators for a Depleted Matrix (F3).
Hydrology
No soil saturation or water table was observed at the soil pit during the field
investigation on May 11, 2016; however, based on the presence of a drainage pattern
(B10) and its geomorphic position (D2), wetland hydrology was assumed to be
present. The primary sources of hydrology include groundwater discharge from hillside
seeps.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 5.4L were verified with a
GPS device where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 5.4L is rated Category IV using the Ecology rating system because it provides
moderate water quality (6) functions and low hydrologic (4) and habitat (3) functions,
scoring 13 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 5.4L provides low potential to improve water quality due to its steepness.
Over 50 percent of dense, uncut, herbaceous plants are present in the wetland. I-405
located uphill side of the wetland provides moderate potential to support the water
quality functions. Johns Creek is mapped to originate near the wetland, and the stream
discharges into Lake Washington approximately 1,300 feet downstream of the wetland.
Lake Washington is listed as an impaired water body on the 303(d) list. Due to its
proximity to Lake Washington, this wetland has an opportunity to improve water
quality.
Hydrologic
Wetland 5.4L has low potential to reduce flooding and erosion due to limited presence
dense, uncut, rigid plants, but I-405 located upslope of the wetland provides moderate
potential to support the hydrologic functions of the wetland.
Habitat
Wetland 5.4L has low potential to provide habitat for wildlife due to low species
diversity and lack of habitat interspersion. No special habitat features were observed in
the wetland. Surrounding land uses contribute to limited accessible habitat and
undisturbed habitat around the wetland.
Buffer
Condition
The buffer of Wetland 5.4L is mostly forested and dominated by black cottonwood.
English hawthorn, common velvet grass (Holcus lanatus), creeping bentgrass, and red
fescue (Festuca rubra) are also present. A gravel access road is located on the north
side of the buffer.
I-405 Wetland and Stream Assessment Report Page 18
Table 9. Wetland 5.36L Summary
WETLAND 5.36L – INFORMATION SUMMARY
Location: Latitude 47.498162, Longitude -122.195652
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.08 acres
Cowardin
Classification PEM/PSS
HGM Classification Slope
Wetland Data Sheet(s) SP 5.36L-W
Upland Data Sheet (s) SP 5.36L-U
Flag color N/A
Dominant
Vegetation
Wetland 5.36L is comprised of scrub-shrub and emergent vegetation communities.
The emergent community is dominated by dagger-leaf rush (Juncus ensifolius),
common duckweed (Lemna minor), soft rush, bird’s-foot trefoil (Lotus corniculatus),
and broad-leaf cattail. The scrub-shrub community is composed of red-osier dogwood
and Himalayan blackberry.
Soils
Soils in Wetland 5.36L consists of 4 inches of muck, 8 inches of greenish black (Gley 1
2.5/10Y) sandy loam and 6 inches of very dark greenish gray (Gley1 3/10Y) sandy clay
loam. Wetland 5.36L meets hydric soil indicators for a Histic Epipedon (A2).
Hydrology
Saturated soils and water table were present at the surface, and surface water was
present near the soil pit. Groundwater discharge from hillside seeps is the primary
sources of hydrology
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 5.36L were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 5.36L is rated Category IV using the Ecology rating system because it
provides moderate water quality (5) functions and low hydrologic (4) and habitat (3)
functions, scoring 12 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 5.36L has moderate potential to improve water quality due to the presence of
organic soils and over 50 percent of dense, uncut herbaceous plants. Roadways near
the wetland provide moderate potential to support the water quality functions.
Hydrologic
Wetland 5.36L has low potential to reduce flooding and stream erosion due to limited
presence of dense, uncut, rigid plant cover. Highway runoff from upslope of the
wetland provide moderate potential to support the hydrologic functions.
Habitat
Wetland 5.36L has low potential to provide habitat for wildlife due to low species
diversity and lack of special habitat features. Limited accessible habitat and disturbed
habitat are present around the wetland because the wetland is surrounded by Houser
Way to the west and I-405 to the east.
Buffer
Condition
The vegetated buffer of Wetland 5.36L is limited as the wetland is bounded by paved
roads. The remaining portion of the buffer is dominated by big-leaf maple (Acer
macrophyllum) and Himalayan blackberry.
I-405 Wetland and Stream Assessment Report Page 19
Table 10. Wetland 5.37L Summary
WETLAND 5.37L – INFORMATION SUMMARY
Location: Latitude 47.498915, Longitude -122.195986
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.37 acres
Cowardin
Classification PEM/PSS
HGM Classification Slope
Wetland Data Sheet(s) SP 5.37L-W
Upland Data Sheet (s) SP 5.37L-U
Flag color N/A
Dominant
Vegetation
Wetland 5.37L consists of scrub-shrub and emergent vegetation communities. The
emergent community is dominated by soft rush and creeping bentgrass. Stalk-grain
sedge (Carex stipata) is also present in the wetland. The scrub-shrub community is
dominated by red-osier dogwood and Himalayan blackberry.
Soils
Soils in Wetland 5.37L consist of 10 inches of dark grayish brown (10YR 4/2) sandy
loam with redoximorphic features and at least 6 inches of gray (5Y 5/1) sandy loam
with redoximorphic features. Wetland 5.37L meets hydric soil indicators for a Depleted
Matrix (F3).
Hydrology
No soil saturation or water table was present during the field investigation on May 11,
2016. However, sediment deposits (B2) were observed within the wetland, indicating
hillside seeps are likely the primary source of wetland hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 5.37L were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 5.37L is rated Category IV using the Ecology rating system because the
wetland provides low water quality (4), hydrologic (4), and habitat (3) functions, scoring
11 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 5.37L has low potential to improve water quality due to lack of retention areas
and lack of dense, uncut herbaceous plants. Roadways near the wetland provide
moderate potential to support the water quality functions.
Hydrologic
Wetland 5.37L has low potential to reduce flooding and stream erosion due to limited
presence of dense, uncut, rigid plants cover. Highways located upslope of the wetland
provide moderate potential to support the hydrologic functions.
Habitat
Wetland 5.37L has low potential to provide habitat for wildlife due to low species
diversity and lack of special habitat features. Limited accessible habitat and
undisturbed habitat are available around the wetland because the wetland is
surrounded by Houser Way to the west and I-405 to the east.
Buffer
Condition
The vegetated portion of the buffer is mostly located east of Wetland 5.37L as Houser
Way cuts off the western portion of the buffer. The vegetated buffer is dominated by
Himalayan blackberry, sword fern (Polystichum munitum), and trailing blackberry
(Rubus ursinus).
I-405 Wetland and Stream Assessment Report Page 20
Table 11. Wetland 5.38L Summary
WETLAND 5.38L – INFORMATION SUMMARY
Location: Latitude 47.501479, Longitude -122.197424
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.26 acres
Cowardin
Classification PEM/PFO
HGM Classification Depressional
Wetland Data Sheet(s) SP 5.38L-W
Upland Data Sheet (s) SP 5.38L-U
Flag color N/A
Dominant
Vegetation
Wetland 5.38L is comprised of emergent and forested communities. The emergent
community is dominated by soft rush, bird’s-foot trefoil, and giant horsetail. Lady fern
(Athyrium cyclosorum) and woolly sedge (Carex pellita) are also present. The forested
community is dominated by black cottonwood with an understory of giant horsetail and
lady fern.
Soils
Soils in Wetland 5.38L consists of 10 inches of very dark grayish brown (10YR 3/2) silt
loam over 8 inches of dark greenish gray (Gley1 4/10Y) sandy loam with redoximorphic
features. Sulfidic odor was present at 6 inches below surface. Wetland 5.38L meets
hydric soil indicators for a Hydrogen Sulfide (A4) and a Loamy Gleyed Matrix (F2).
Hydrology
Saturated soils and water table were present at the soil surface, and surface water was
present near the sam ple plot. The primary sources of hydrology for Wetland 5.38L
include a high-water table and groundwater discharge from hillside seeps
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 5.38L were verified with a
GPS device where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 5.38L is rated Category IV using the Ecology rating system because it provides
moderate water quality (5) and hydrologic (5) functions and low habitat (4) functions,
scoring 14 points on the rating form.
Wetland Functions Summary
Water
Quality
Wetland 5.38L has low site potential to improve water quality because the wetland has a
constricted permanently flowing outlet with over 50 percent of persistent, ungrazed plants
and less than 25 percent of seasonally ponded area. Surrounding landscape provides
moderate potential to support water quality functions as the wetland receives untreated
runoff from adjacent roadway.
Hydrologic
Wetland 5.38L has moderate potential to reduce flooding and erosion as the wetland has
some storage capacity available to retain surface water. Roadways near the wetlands
provide moderate potential to support hydrologic functions.
Habitat
Wetland 5.38L has low site potential to provide habitat for wildlife because the wetland
has multiple hydroperiods, some interspersion of habitats, and presence of special
habitat features including large downed woody debris, and presence of overhanging
plants, and evidence of beaver activity. However, the surrounding landscape provides
limited potential to support habitat functions of this wetland.
Buffer
Condition
The buffer west of Wetland 5.38L is partly cut off by Houser Way. The remaining portion
of the buffer is mostly dominated by black cottonwood and Himalayan blackberry.
I-405 Wetland and Stream Assessment Report Page 21
Table 12. Wetland 5.39L Summary
WETLAND 5.39L – INFORMATION SUMMARY
Location: Latitude 47.501932, Longitude -122.198235
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.06 acres
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 5.39L-W
Upland Data Sheet (s) SP 5.39L-U
Flag color N/A
Dominant
Vegetation
Wetland 5.39L is dominated by an emergent vegetation community of soft rush, giant
horsetail, and bird’s-foot trefoil. Himalayan blackberry, black cottonwood saplings, red
alder saplings, and dagger-leaf rush are also present.
Soils
Soils in Wetland 5.39L consist of 6 inches of very dark grayish brown (10YR 3/2) silt
loam over at least 6 inches of dark grayish brown (2.5Y 4/2) sandy loam with
redoximorphic features. Compacted gravel is present below 12 inches of the soil
surface. Soils observed in the sample plot meet hydric soil indicators for a Depleted
Matrix (F3).
Hydrology
Saturated soils were present at the soil surface. No water table or surface water was
observed during the field investigation, but a high-water table is likely the primary
source of hydrology for this wetland.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 5.39L were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 4.53R is rated Category IV using the Ecology rating system because it
provides moderate water quality (5) and hydrologic (5) functions and low habitat (3)
functions, scoring 13 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 5.39L has moderate potential to improve water quality as it lacks an outlet and
has over 50 percent of persistent, ungrazed vegetation. Roadways adjacent to the
wetland provide moderate potential to support t the water quality functions of Wetland
5.39L.
Hydrologic
Wetland 5.39L has moderate potential to reduce flooding and erosion due to lack of an
outlet and a smaller contributing basin. Surrounding land uses also provide moderate
potential to support hydrologic functions of the wetland.
Habitat
Wetland 5.39L has low potential to provide habitat for wildlife because it has low plant
diversity and no interspersion of habitat. No special habitat features were observed in
the wetland. Surrounding land uses provide limited accessible habitat and undisturbed
habitat.
Buffer
Condition
The buffer south of Wetland 5.39L is cut off by Houser Way. The remaining portion of
the buffer is in road prism containing riprap. Black cottonwood, big-leaf maple saplings,
and Himalayan blackberry are present in the road prism.
I-405 Wetland and Stream Assessment Report Page 22
Table 13. Wetland 7.2 R Summary
WETLAND 7.2R – INFORMATION SUMMARY
Location: Latitude 47.52974, Longitude -122.196789
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width
125 feet (Shoreline
Jurisdiction)
Wetland Size 3.9 acres
Cowardin
Classification PFO
HGM Classification Depressional
Wetland Data Sheet(s) SP 7.2R-W
Upland Data Sheet (s) SP 7.2R-U
Flag color N/A
Dominant
Vegetation
Wetland 7.2R is dominated by a forested vegetation community that consists of red
alder and Oregon ash (Fraxinus latifolia) with an understory of Sitka willow (Salix
sitchensis), Himalayan blackberry, and reed canarygrass.
Soils
Soils in Wetland 7.2R consists of 4 inches of black (10YR 2/1) sandy loam and 14
inches of very dark greenish gray (Gley1 3/10Y) sandy loam with redoximorphic
features. Suflidic odor was present in the soil profile. Soils in Wetland 7.2R meet the
hydric soil indicators for a Hydrogen Sulfide (A4).
Hydrology
Soil saturation was present at 10 inches below the surface. Primary sources of
hydrology for this wetland include a high groundwater table and stormwater runoff from
adjacent roadways.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 7.2R were verified with a
GPS device where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 7.2R is rated Category III using the Ecology rating system because it provides
moderate water quality (7), hydrologic (5), and habitat (6) functions, scoring 18 points
on the rating form.
Wetland Functions Summary
Water Quality
Wetland 7.2R has moderate potential to improve water quality because it has an
intermittently flowing ditch with over 95 percent of persistent, ungrazed plants and over
25 percent of seasonally ponded area. Because it is located immediately adjacent to I-
405 and Jones Avenue, surrounding landscape provides moderate potential to support
the water quality function of this wetland. Southern portion of the wetland likely sheet
flows into May Creek, which is on the 303(d) list.
Hydrologic
Wetland 7.2R has low site potential to reduce flooding and erosion lack of storage
capacity. However, surrounding roadways provide high potential to support hydrologic
functions of the wetland.
Habitat
Wetland 7.2R has low site potential to provide habitat for wildlife due to lack of species
diversity and habitat interspersion. Due to its location in the landscape, accessible
habitat and undisturbed habitat are limited around the wetland. Some special habitat
features, including large downed woody debris, standing snags, and at least ¼ acre of
thin-stemmed persistent plants were observed in the wetland.
Buffer
Condition
Wetland 7.2R is bounded by I-405 to the west, I-405 off-ramp to the north, and Jones
Avenue to the east. The vegetated buffer of Wetland 7.2R is located south of Wetland
7.2R and is dominated by big-leaf maple, black cottonwood, and Himalayan
blackberry.
I-405 Wetland and Stream Assessment Report Page 23
Table 14. Wetland 7.3 R Summary
WETLAND 7.3R – INFORMATION SUMMARY
Location: Latitude 47.531666, Longitude -122.195695
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.4 acres
Cowardin
Classification PFO
HGM Classification Depressional
Wetland Data Sheet(s) SP 1-GC
Upland Data Sheet (s) SP 2-GC
Flag color Pink
Dominant
Vegetation
Wetland 7.3R is dominated by a forested vegetation community that consists of black
cottonwood and Oregon ash with an understory of Himalayan blackberry, creeping
buttercup, and giant horsetail. English ivy (Hedera helix) is also present within the
wetland.
Soils Use information collected on SP 1-GC by WSDOT
Hydrology Use information collected on SP 1-GC by WSDOT. The primary sources of
hydrology include a high groundwater table and overbank flooding from Gypsy Creek.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 7.3R were verified with a
GPS device where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system. Wetland
7.3R is rated Category IV using the Ecology rating system because the wetland provides low
water quality (4) functions and moderate hydrologic (6) functions and habitat (5) functions,
scoring 15 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 7.3R has low site potential to improve water quality because it has a slightly
constricted permanently flowing surface outlet, over 50 percent of persistent ungrazed
plants, and less than 25 percent of seasonal ponding. Surrounding land uses provide
moderate potential to support water quality functions. Gypsy Creek is not on the
303(d) list.
Hydrologic
Wetland 7.3R has moderate potential to reduce flooding since it has some flood
storage capacity. Surrounding land uses provide high potential to support hydrologic
functions of the wetland.
Habitat
Wetland 7.3R has low site potential to provide habitat for wildlife due to lack of species
diversity and habitat interspersion. Due to its location in the landscape, Wetland 7.3R
has limited accessible and undisturbed habitats. This wetland provides a moderate
value to habitat because Gypsy Creek flows through the wetland.
Buffer
Condition
Wetland 7.3R is bounded by the I-405 ramp to the west, NE 44th Street to the north, a
parking lot to the east, and Jones Avenue NE to the south. As a result, the vegetated
buffer is limited to a narrow strip between the paved area and the wetland. This area is
dominated by Himalayan blackberry, sword fern, beaked hazelnut (Corylus cornuta),
and Indian plum (Oemleria cerasiformis)
I-405 Wetland and Stream Assessment Report Page 24
Table 15. Wetland 7.5L Summary
WETLAND 7.5L – INFORMATION SUMMARY
Location: Latitude 47.533055, Longitude -122.198286
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 75 feet
Wetland Size 0.28 acres
Cowardin
Classification PSS
HGM Classification Depressional
Wetland Data Sheet(s) SP 7.5L-W1,
SP 7.5L-W2
Upland Data Sheet (s) SP 7.5L-U
Flag color N/A
Dominant
Vegetation
Wetland 7.5L is dominated by a scrub-shrub vegetation community consisting of
Oregon ash saplings, Pacific willow, red-osier dogwood, and Himalayan blackberry.
Japanese knotweed (Reynoutria japonica), yellow iris (Iris pseudacorus), and fringed
willowherb (Epilobium ciliatum) are also present in the wetland.
Soils
Soils in Wetland 7.5L consists of at least 5 inches of very dark grayish brown (10YR
3/2) sandy loam or silt loam over 7 inches of dark grayish brown (10YR 4/2) silt loam
with redoximorphic features. Soils in Wetland 7.5L meet hydric soil indicators for a
Depleted Matrix (F3).
Hydrology
No soil saturation or water table was observed in the sample plot. However, evidence
of surface water ponding including rust on the chain link fence that runs through the
wetland, sediment deposit on woody vegetation, water stained leaves, and algal mat
were present in the wetland. The primary sources of wetland hydrology include a high
groundwater table and runoff from adjacent roadway.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 7.5L were verified with a
GPS device where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 7.5L is rated Category III using the Ecology rating system because it provides
moderate water quality (5) and hydrologic (7) functions and low habitat (4) functions,
scoring 16 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 7.5L has moderate potential to improve water quality as the wetland lacks an
outlet and has over 50 percent of persistent ungrazed plants and over 50 percent of
seasonally ponded area. Surrounding roadways provide moderate potential to support
the water quality functions of the wetland.
Hydrologic
Wetland 7.5L has high site potential to reduce flooding and erosion due to lack of an
outlet, the presence of live storage available, and a smaller size of contributing basin.
Surrounding roadways also provide high potential to support hydrologic functions of
the wetland.
Habitat
Wetland 7.5L has low potential to provide habitat for wildlife as it has low species
diversity and no habitat interspersion. Some special habitat features such as large
downed woody debris and standing snags were observed in the wetland. Because the
wetland is surrounded by roadways, accessible habitat and undisturbed habitat around
the wetland are limited.
Buffer
Condition
Wetland 7.5L is bounded by I-405 off-ramp to the east and Seahawks Way to the west;
therefore, the vegetated buffer of Wetland 7.5L is limited to north and south of the
wetland. The vegetated buffer of Wetland 7.5L is dominated by red alder, black
cottonwood, and Himalayan blackberry.
I-405 Wetland and Stream Assessment Report Page 25
Table 16. Wetland 7.8L Summary
WETLAND 7.8L – INFORMATION SUMMARY
Location: Latitude 47.537608, Longitude -122.195466
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40
Wetland Size 0.07 acre
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 7.8L-W
Upland Data Sheet (s) SP 7.8L-U
Flag color N/A
Dominant
Vegetation
Wetland 7.8L is dominated by an emergent vegetation community that consists of giant
horsetail, climbing nightshade, American brooklime (Veronica americana), and tall
managrass.
Soils
Soils in Wetland 7.8L consist of 2 inches of black (10YR 2/1) silt loam, 6 inches of very
dark greenish gray (Gley 1 3/10Y) silt loam, and 2 inches of very dark greenish gray
(Gley 1 3/10Y) with redoximorphic features. Positive reaction to alpha-alpha-dipyridyl
strip was observed in the second silt loam layer. Soils in Wetland 7.8L are considered
problematic; however, a positive reaction to alpha-alpha-dipyridyl strip indicates that
the soils are hydric.
Hydrology
Saturated soils and water table were present at the soil surface, and surface water was
also present near the sample plot. High groundwater table is the primary source of
wetland hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 7.8L were verified with a
GPS device where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 7.8L is rated Category III using the Ecology rating system because it provides
moderate water quality (5) functions, moderate hydrologic (5) functions, and low
habitat (4) functions, totaling 14 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 7.8L has low site potential to improve water quality as it has slightly
constricted surface outlet, less than 50 percent of persistent ungrazed plants, and less
than 25 percent of seasonally ponding area. The adjacent roadway provides moderate
potential to support the water quality function of the wetland.
Hydrologic
Wetland 7.8 L has low site potential to reduce flooding and erosion due to limited live
storage available. Surrounding land uses provide high potential to support hydrologic
functions of the wetland.
Habitat
Wetland 7.8L has low potential to provide habitat for wildlife due to its size, low species
diversity, and lack of habitat interspersion. Accessible habitat and undisturbed habitat
are limited around the wetland. A tributary to Lake Washington that runs along this
wetland provides moderate value for wildlife.
Buffer
Condition
Wetland 7.8L is bounded by Ripley Lane North to the east and residential houses to
the north and the west. As a result, the vegetated buffer of Wetland 7.8L is less than
50 feet wide. The vegetated portion of the wetland buffer Is dominated by red alder,
Himalayan blackberry, and giant horsetail.
I-405 Wetland and Stream Assessment Report Page 26
Table 17. Wetland 7.35R Summary
WETLAND 7.35R – INFORMATION SUMMARY
Location: Latitude 47.531619, Longitude -122.196917
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.28 acres
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 7.35R-W
Upland Data Sheet (s) SP 7.35R-U
Flag color N/A
Dominant
Vegetation
Wetland 7.35R is dominated by an emergent vegetation community of reed
canarygrass. Forget-me-not (Myosotis arvensis), American purple vetch (Vicia
americana), and Canada thistle (Cirsium arvense) are also present in the wetland.
Soils
Soils in Wetland 7.35R consist of 7 inches of dark grayish brown (10YR 4/2) silt loam,
8 inches of dark grayish brown (2.5Y 4/2) silt loam with redoximorphic features, and at
least 3 inches of dark grayish brown (2.5Y 4/2) sandy loam with redoximorphic
features. Soils in Wetland 7.35R meet hydric soil indicators for a Depleted Matrix (F3).
Hydrology
No soil saturation was observed at the sample plot. However, surface saturation was
observed approximately 20 feet south of the sample plot in a swale. The primary
sources of hydrology include a high groundwater table and stormwater runoff from
adjacent roadway. Sediment deposits (B2) are also present within the wetland.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 7.35R were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 7.35R is rated Category IV using the Ecology rating system because it
provides moderate water quality (5) and hydrologic (6) functions and low habitat (4)
functions, totaling 15 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 7.35R has moderate potential to improve water quality because it has an
intermittently flowing ditch and over 90 percent of persistent ungrazed plants. Because
this wetland is located immediately adjacent to the I-405 on-ramp, surrounding
landscape has the moderate potential to support the water quality functions of the
wetland.
Hydrologic
Wetland 7.35R has moderate potential to reduce flooding and erosion because it has
an intermittent outflow and has a smaller contributing basin. Because of its location
adjacent to the I-405 on-ramp, surrounding landscape provides high potential to
support hydrologic functions of this wetland.
Habitat
Wetland 7.35R has low potential to provide habitat for wildlife due to its location, size,
low species diversity, and lack of habitat interspersion. No special habitat features
were observed in the wetland. Accessible habitat and undisturbed habitat are limited
as the wetland is surrounded by roadways. Wetland 7.35R is considered to provide a
moderate value for wildlife because it is located in close proximity to Gypsy Creek.
Buffer
Condition
The buffer south of Wetland 7.35R is cut off by I-405 off-ramp. The remaining portion
of the buffer is dominated by Kentucky blue grass (Poa pratensis), forget-me-not, and
field mouse-ear chickweed (Cerastium arvense).
I-405 Wetland and Stream Assessment Report Page 27
Table 18. Wetland 7.42R Summary
WETLAND 7.42R – INFORMATION SUMMARY
Location: Latitude 47.53534, Longitude -122.19534
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 100
Wetland Size 0.17
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 7.42R-W
Upland Data Sheet (s) SP 7.42R-U
Flag color N/A
Dominant
Vegetation
Wetland 7.42R is dominated with an emergent vegetation community with reed
canarygrass. Common cattail, pale-yellow iris, and Himalayan blackberry are also
present in the wetland.
Soils
Soils in Wetland 7.42R consist of 6 inches of very dark grayish brown (10YR 3/2)
sandy loam and 12 inches of dark gray (10YR 4/1) sandy loam with redoximorphic
features. Soils in Wetland 7.42R meet hydric soil indicators for a Depleted Matrix (F3).
Hydrology
No soil saturation was observed at the sample plot during the field investigation in
June 2016; however, sediment deposits (B2) and water stained leaves (B9) were
observed within the wetland. Primary sources of hydrology for this wetland include
high-water table and runoff from adjacent roadways.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 7.42R were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 7.42R is rated Category III using the Ecology rating system because it
provides moderate water quality (65, hydrologic (6), and habitat (5) functions, scoring
16 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 7.42R has moderate potential to improve water quality due to the presence of
an intermittently flowing ditch, over 95 percent of persistent ungrazed plants, and over
25 percent of seasonally ponding area. The adjacent roadways provide moderate
potential to support the water quality function of the wetland. Gypsy Creek is not on the
303(d) list.
Hydrologic
Wetland 7.42R has moderate potential to reduce flooding and erosion because it has
somewhat limited outflow and has a smaller contributing basin. Surrounding land uses
provide high potential to support hydrologic functions of the wetland.
Habitat
Wetland 7.42R has low potential to provide habitat for wildlife due to lack of species
diversity and habitat interspersion. No special habitat features were observed in the
wetland. Accessible habitat and undisturbed habitat are limited around the wetland,
however, land use intensity in 1 kilometer of the wetland is estimated to be less than
50 percent. Wetland 7.42R provides a moderate value for wildlife because Gypsy
Creek runs south end of the wetland.
Buffer
Condition
The vegetated portion of the buffer is located east of Wetland 4.9R as I-405 cuts off
the western portion of the buffer. The vegetated buffer is dominated by black
cottonwood, Cascara buckhorn (Rhamnus purshiana), Himalayan blackberry, sword
fern, and trailing blackberry.
I-405 Wetland and Stream Assessment Report Page 28
Table 19. Wetland 7.44L Summary
WETLAND 7.44L – INFORMATION SUMMARY
Location: Latitude 47.532125, Longitude -122.199066
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.07 acres
Cowardin
Classification PSS
HGM Classification Depressional
Wetland Data Sheet(s) SP 7.44L-W
Upland Data Sheet (s) SP 7.44L-U
Flag color N/A
Dominant
Vegetation
Wetland 7.44L is dominated by a scrub-shrub vegetation community that consists of
Scouler’s willow (Salix scouleriana), Stika willow, red osier dogwood, and Himalayan
blackberry.
Soils
Soils in Wetland 7.44L consists of 8 inches of dark grayish brown (10YR 4/2) sandy
loam and 10 inches of dark gray (5Y 4/1) sandy loam with redoximorphic features.
Wetland 7.44L meets hydric soil indicators for a Depleted Matrix (F3).
Hydrology
No soil saturation or water table was present during the field investigation on May 4,
2016. However, water marks (B1) and water stained leaves (B9) were observed within
the wetland, indicating that the wetland likely gets inundated early in the growing
season. A high groundwater table is likely the primary source of hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 7.44L were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 7.44L is rated Category IV using the Ecology rating system because the
wetland provides moderate water quality (5) and hydrologic (6) functions and low
habitat (4) functions, scoring 15 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 7.44L has moderate potential to improve water quality because it has no
outlet and has persistent ungrazed plants. Surrounding roadways provide moderate
potential to support water quality functions of this wetland.
Hydrologic
Wetland 7.44L has moderate potential to reduce flooding and erosion due to lack of an
outlet and a smaller contributing basin size. Surrounding roadways provide high
potential to support hydrologic functions of the site.
Habitat
Potential habitat functions provided by Wetland 7.44L are low due to low species
diversity, no habitat interspersion, and lack of special habitat features. Accessible
habitat around Wetland 7.44L is limited, and undisturbed habitat is fragmented.
Buffer
Condition
The buffer adjoining Wetland 7.44L is dominated by red alder, Scouler’s willow, red-
osier dogwood, sword fern, and Himalayan blackberry. English ivy, English holly (Ilex
aquifolium), and reed canarygrass are also present. Southern and western portions of
the buffer are less than 50 feet wide as Seahawks Way and Lake Washington
Boulevard cut off the buffer.
I-405 Wetland and Stream Assessment Report Page 29
Table 20. Wetland 7.78L Summary
WETLAND 7.78L – INFORMATION SUMMARY
Location: Latitude 47.534765, Longitude -122.196569
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 100 feet
Wetland Size 0.87 acres
Cowardin
Classification PEM/PSS/PFO
HGM Classification Depressional
Wetland Data Sheet(s) SP 7.78L-W
Upland Data Sheet (s) SP 7.78L-U
Flag color N/A
Dominant
Vegetation
Wetlands 7.78L is comprised of emergent, scrub-shrub, and forested vegetation
communities. The emergent community is located at the northern end of the wetland
and is dominated by reed canarygrass, broad-leaf cattail, and common duckweed. The
scrub-shrub community is located at the southern end of the wetland, and it consists of
Pacific willow, red-osier dogwood, and Himalayan blackberry. The forested community
is dominated by red alder with an understory of reed canarygrass, pale-yellow iris,
giant horsetail, and lady fern. Himalayan blackberry is present in all vegetation
communities.
Soils
Soils in Wetland 7.78L consist of 10 inches of organic layer, 2 inches of greenish gray
(Gley1 5/10Y) silt loam with redoximorphic features, and 7 inches of dark gray (10YR
4/1) silt loam with organic debris inclusion. Wetland 7.78L meets hydric soil indicators
for a Histic Epipedon (A2) and Loamy Gleyed Matrix (F2).
Hydrology
Saturated soils and water table were present at the soil surface. The primary sources
of hydrology include a high groundwater table and overbank flooding from Gypsy
Creek and two other drainage features.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 5.38L were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present. Portions of the wetland near Gypsy Creek have been re-
delineated.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 7.78L is rated Category III using the Ecology rating system because it
provides moderate water quality (6), hydrologic (6), and habitat (5) functions, scoring
18 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 7.78L provides high site potential to improve water quality due to the
presence of organic soils, over 95 percent of persistent ungrazed plants, and over 50
percent of seasonal ponding area. Water quality functions of this wetland are
supported by surrounding roadways.
Hydrologic
Wetland 7.78L has moderate potential to reduce flooding and erosion due to the
presence of available live storage and a smaller size of contributing basin. Surrounding
roadways support hydrologic functions of the wetland.
Habitat
Wetland 7.78L has moderate potential to provide wildlife habitat because it has
multiple Cowardin classes and hydroperiods with streams running through the wetland.
Accessible habitat and undisturbed habitat are limited around the wetland; however,
Wetland 7.78L provides a moderate value for wildlife as Gypsy Creek flows through
the wetland.
Buffer
Condition
Wetland 7.78L is bounded by I-405 to the east and Seahawks Way to the west;
therefore, the vegetated buffer of Wetland 7.78L is less than 100 feet wide. The
vegetated buffer of Wetland 7.78L is mostly dominated by Himalayan blackberry.
Choke cherry (Prunus virginiana) is also present along I-405.
I-405 Wetland and Stream Assessment Report Page 30
Table 21. Wetland 7.79L Summary
WETLAND 7.79L – INFORMATION SUMMARY
Location: Latitude 47.537163, Longitude -122.19542
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.1 acres
Cowardin
Classification PSS/PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 7.79L-W
Upland Data Sheet (s) SP 7.79L-U
Flag color N/A
Dominant
Vegetation
Wetland 7.79L consists of scrub-shrub and emergent vegetation communities. The
scrub-shrub community is dominated by Sitka willow and red alder saplings with an
understory of climbing nightshade. The emergent community is dominated by climbing
nightshade (Soladum dulcamara), reed canarygrass, and soft rush.
Soils
Soils in Wetland 7.79L consists of 8 inches of dark grayish brown (10YR 4/2) silt loam
with redoximorphic features, 10 inches of dark greenish gray (Gley1 4/10Y) silt loam,
and 10 inches of grayish brown (10YR 4/2) silt loam with redoximorphic features.
Wetland 7.79L meets hydric soil indicators for a Loamy Gleyed Matrix (F2) and a
Depleted Matrix (F3).
Hydrology
Soils were saturated to the surface, and water stained leaves were also present in the
wetland. Primary sources of wetland hydrology include a high-water table and
overbank flooding from an unnamed tributary to lake Washington.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 7.79L were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 7.79L is rated Category IV using the Ecology rating system because it
provides moderate water quality (5), hydrologic (6), and habitat (4) functions, totaling
15 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 7.79L has moderate potential to improve water quality due to the presence of
slightly constricted outlet, over 95 percent of persistent ungrazed plants, and over 25
percent of seasonally ponding area. The adjacent roadway provides moderate
potential to support the water quality function of the wetland.
Hydrologic
Wetland 7.79L has moderate potential to reduce flooding and erosion because it has
somewhat limited outflow and has some live storage available. Surrounding land uses
provide high potential to support hydrologic functions of the wetland.
Habitat
Wetland 7.79L has low site potential to provide habitat for wildlife due to its size, low
species diversity, and low habitat interspersion. Accessible habitat is limited around the
wetland, and undisturbed habitat in one kilometer of the wetland is estimated to be less
than 50 percent. Wetland 7.79L provides a moderate value for wildlife because an
unnamed tributary to Lake Washington flows through the wetland.
Buffer
Condition
Wetland 7.9L is bounded by Ripley Lane to the east and BNSF track to the west;
therefore, the vegetated buffer of Wetland 7.9L is limited to north and south. The
vegetated portion of the wetland buffer Is dominated by black cottonwood and
Himalayan blackberry.
I-405 Wetland and Stream Assessment Report Page 31
Table 22. Wetland 7.82R Summary
WETLAND 7.82R – INFORMATION SUMMARY
Location: Latitude 47.536603, Longitude -122.19443
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.37 acres
Cowardin
Classification PSS/PFO
HGM Classification Slope
Wetland Data Sheet(s) SP 7.82R-W
Upland Data Sheet (s) SP 7.82R-U
Flag color N/A
Dominant
Vegetation
Wetland 7.82R is dominated by forested and scrub-shrub vegetation communities. The
forested community consists of red alder, black cottonwood with an understory of
Himalayan blackberry, reed canarygrass, and giant horsetail. The scrub-shrub
vegetation comm unity is dominated by red alder saplings, Scouler’s willow, and
Himalayan blackberry.
Soils
Soils in Wetland 7.82R consist of 6 inches of black (10YR 2/1) silt loam and 12 inches
of dark greenish gray (Gley1 4/10Y) sandy loam with redoximorphic concentration.
Wetland 7.82R meets hydric soil indicators for a Loamy Gleyed Matrix (F2).
Hydrology
Soils were saturated to the surface, and water table was present at 12 inches in the
soil pit. Groundwater discharge from hillside seeps is the primary source of wetland
hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 7.82R were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 7.82R is rated Category IV using the Ecology rating system because it
provides moderate water quality (5), hydrologic (5), and habitat (5) functions, totaling
15 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 7.82R has low site potential to improve water quality due over 90 percent of
dense, uncut, herbaceous plants. Because this wetland is located adjacent to I-405,
surrounding land uses provide moderate potential to support the water quality function
of this wetland.
Hydrologic
Wetland 7.82R provides moderate potential to reduce flooding and stream erosion due
to the presence of dense, uncut, rigid plants. Surrounding landscape supports the
wetland to provide hydrologic functions.
Habitat
Wetland 7.82R has moderate potential to provide habitat for wildlife as the wetland has
two plant communities. Some special habitat features such as large downed woody
debris, standing snags, and overhanging vegetation over a stream were observed in
the wetland. Due to its location, accessible habitat and undisturbed habitat are limited
around the wetland. However, the presence of a stream in the wetland provides a
moderate value for wildlife.
Buffer
Condition
Wetland 7.82R is bounded by I-405 to the west and Lake Washington Boulevard to the
east; therefore, the vegetated buffer of Wetland 7.82R is less than 50 feet wide. The
vegetated buffer is dominated by big-leaf maple, black cottonwood, Himalayan
blackberry, and beaked hazelnut.
I-405 Wetland and Stream Assessment Report Page 32
Table 23. Wetland 7.83R Summary
WETLAND 7.83R – INFORMATION SUMMARY
Location: Latitude 47.538549, Longitude -122.193126
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40
Wetland Size 0.17
Cowardin
Classification PFO
HGM Classification Slope
Wetland Data Sheet(s) SP 7.83R-W
Upland Data Sheet (s) SP 7.83R-U
Flag color N/A
Dominant
Vegetation
Wetland 7.83R is dominated by a forested vegetation community that consists of red
alder with an understory of salmonberry, reed canarygrass, lady fern, and giant
horsetail. Some Himalayan blackberry is also present along the edge.
Soils
Soils in Wetland 7.83R consist of 6 inches of very dark grayish brown (10YR 3/2) silt
loam and 12 inches of dark gray (10YR 4/1) silt loam with redoximorphic features.
Wetland 7.83R meets hydric soil indicators for a Depleted Matrix (F3).
Hydrology
Soils were saturated to the surface, and water table was present at 4 inches below the
surface. Surface water was also present at the soil pit. Groundwater discharge from
hillside seep is the primary source of hydrology for this wetland.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 7.83R were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 7.83R is rated Category IV using the Ecology rating system because it
provides moderate water quality (5) and low hydrologic (3) and habitat (4) functions,
totaling 12 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 7.83R has moderate potential as it has over 90 percent of dense, uncut,
herbaceous plants. Lake Washington Boulevard located on the uphill side of the
wetland provides moderate potential to support the water quality functions of the
wetland.
Hydrologic
Wetland 7.83R has low potential to reduce flooding and stream erosion due to lack of
over 90 percent of dense, uncut, rigid plants. Hydrologic functions of the wetland are
limited as there are no sources of excess surface runoff within 150 feet upslope of
wetland.
Habitat
Wetland 7.843 has low potential to provide habitat for wildlife due to low diversity and
lack of habitat interspersion. Surrounding land uses including commercial and
residential buildings limit accessible habitat and undisturbed habitat around the
wetland. Presence of the unnamed stream near the wetland gives a moderate value
for wildlife.
Buffer
Condition
The buffers adjoining Wetland 7.843 is dominated by red alder, Himalayan blackberry,
reed canarygrass, and giant horsetail.
I-405 Wetland and Stream Assessment Report Page 33
Table 24. Wetland 7.84R Summary
WETLAND 7.84R – INFORMATION SUMMARY
Location: Latitude 47.538226, Longitude -122.193913
Local Jurisdiction Renton
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.66 acres
Cowardin
Classification PEM/PFO
HGM Classification Slope
Wetland Data Sheet(s) SP 7.84R-W
Upland Data Sheet (s) SP 7.84R-U
Flag color Pink
Dominant
Vegetation
Wetland 7.84R consists of emergent and forested vegetation communities. The
emergent community is dominated by reed canarygrass, and the forested community
is dominated by red alder and black cottonwood with an understory of reed
canarygrass, lady fern, and giant horsetail.
Soils
Soils in Wetland 7.84R consists of 6 inches of very dark grayish brown (10YR 3/2) silt
loam and 12 inches of dark greenish gray (Gley1 4/10Y) sandy loam with
redoximorphic features. Wetland 7.84R meets hydric soil indicators for a Loamy
Gleyed Matrix (F2).
Hydrology
Soils were saturated to the surface, and water table was present at 5 inches in the soil
pit. Primary sources of wetland hydrology include groundwater discharge from hillside
seeps and drainage ways.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 7.84R were verified with
a GPS device and re-delineated where indicators of wetland vegetation, hydric soil and
wetland hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 7.84R is rated Category IV using the Ecology rating system because it
provides moderate water quality (5), low h ydrologic (4), and moderate habitat (5)
functions, totaling 14 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 7.84R has moderate potential as it has over 90 percent of dense, uncut,
herbaceous plants. Lake Washington Boulevard located on the uphill side of the
wetland provides moderate potential to support the water quality functions of the
wetland.
Hydrologic
Wetland 7.84R has low potential to reduce flooding and stream erosion due to lack of
over 90 percent of dense, uncut, rigid plants. Hydrologic functions of the wetland are
limited as there are no sources of excess surface runoff within 150 feet upslope of
wetland.
Habitat
Wetland 7.84R has moderate potential to provide habitat for wildlife because it has
multiple vegetation types and hydroperiods. Special habitat features such as large
downed woody debris and overhanging plants over a stream are present in the
wetland. Surrounding land uses including commercial and residential buildings limit
accessible habitat and undisturbed habitat around the wetland. Presence of the
unnamed tributary to Lake Washington near the wetland provides a moderate value for
wildlife.
Buffer
Condition
The buffers adjoining Wetland 7.84R is dominated by black cottonwood, Douglas fir,
Himalayan blackberry, and sword fern. Reed canarygrass and giant horsetail are also
present on the west side of the wetland.
I-405 Wetland and Stream Assessment Report Page 34
Table 25. Wetland 8.2L Summary
WETLAND 8.2L – INFORMATION SUMMARY
Location: Latitude 47.54192737, Longitude -122.1961163
Local Jurisdiction King County
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 50 feet
Wetland Size 0.01 acres
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 8.2L-W
Upland Data Sheet (s) SP 8.2L-U
Flag color N/A
Dominant
Vegetation
Wetland 8.2L is dominated by Himalayan blackberry, reed canarygrass, slough sedge,
and ladyfern.
Soils
Soils in Wetland 8.2L consist of 5 inches of black (10YR2/1) sandy loam over 13
inches of very dark gray (10YR3/1) sandy loam with redoximorphic features. Soils
meet hydric indicator for presence of Hydrogen Sulfide (A4).
Hydrology
Soils were saturated at the surface (A1). Signs of surface water ponding were
observed at 3 inches (A1). The primary sources of hydrology for this wetland include
seeps emanating from the adjacent hillslope.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 8.2L were verified with a
GPS device where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
King County classifies wetlands according to the current Ecology rating system.
Wetland 8.2L is rated Category IV using the Ecology rating system because it provides
moderate water quality (5) and low hydrologic (4) functions and low habitat (3)
functions, scoring 12 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 8.2L has moderate potential to improve water quality as it has a slightly
constricted surface outlet, the wetland has persistent, ungrazed plants greater than
half the area, and over 50 percent of the wetland has seasonal ponding. Surrounding
landscape provides moderate potential to support the water quality.
Hydrologic
Wetland 8.2L has low potential to reduce flooding and erosion due to its minimal depth
of storage capacity during wet periods and a larger contributing basin. Surrounding
areas provide moderate potential to support the hydrologic functions, but there are no
flooding problems downstream of the wetland.
Habitat
Wetland 8.2L has low potential to provide habitat for wildlife due to a single Cowardin
plant structure and no habitat interspersion. No special habitat features or WDFW
Priority Habitats were observed or documented in the wetland.
Buffer
Condition
Wetland 8.2L is bounded by BNSF railroad track to the west. The vegetated portion on
east of Wetland 8.2L is dominated by big leaf maple, beaked hazelnut, ocean spray
(Holodiscus discolor), Himalyan blackberry, and swordfern.
I-405 Wetland and Stream Assessment Report Page 35
Table 26. Wetland 8.2R Summary
WETLAND 8.2R – INFORMATION SUMMARY
Location: Latitude 47.543108, Longitude -122.195299
Local Jurisdiction King County
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 50
Wetland Size 0.03
Cowardin
Classification PEM
HGM Classification Slope
Wetland Data Sheet(s) SP 8.1R-W
Upland Data Sheet (s) SP 8.1R-U
Flag color N/A
Dominant
Vegetation
Wetland 8.2R is dominated by an emergent vegetation community with reed
canarygrass. Some Himalayan blackberries are present along the edges.
Soils
Soils in Wetland 8.2R consist of 4 inches of very dark grayish brown (10YR 3/2) silt
loam and 15 inches of dark grayish brown (10YR 4/2) sandy loam with redoximorphic
features. Sulfidic odor was present at 11 inches below the surface. Wetland 8.1R
meets hydric soil indicators for a Hydrogen Sulfide (A4) and a Depleted Matrix (F3).
Hydrology
Soils were saturated to the surface, and a water table was present at 10 inches in the
soil pit. Groundwater discharge from hillside seeps is the primary source of wetland
hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 8.2R were verified with a
GPS device where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
King County classifies wetlands according to the current Ecology rating system.
Wetland 8.2R is rated Category IV using the Ecology rating system because the
wetland provides low water quality (4), hydrologic (4), and habitat (4) functions, scoring
12 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 8.2 R has moderate site potential to improve water quality as it has over 90
percent off dense, uncut herbaceous plants. However, upslope land uses are
vegetated and have low potential to support the water quality functions. Wetland 8.2R
lacks a surface outlet and does not discharge into any water bodies.
Hydrologic
Wetland 8.2R has moderate site potential to reduce flooding and erosion due to the
presence of dense, uncut, rigid plants. Upslope land uses are vegetated and are not
likely to generate excess surface runoff, resulting in low potential to support the
hydrologic functions of the wetland
Habitat
Wetland 8.2R has low potential to provide habitat for wildlife due to its size, low
species diversity, and no habitat interspersion. Accessible habitat and undisturbed
habitat are limited around the wetland due to the surrounding land uses.
Buffer
Condition
The vegetated portion of the buffer is located east of Wetland 8.1R as I-405 cuts off
the western portion of the buffer. The vegetated buffer is dominated by Himalayan
blackberry, beaked hazelnut, and western red cedar.
I-405 Wetland and Stream Assessment Report Page 36
Table 27. Wetland 8.4L Summary
WETLAND 8.4L – INFORMATION SUMMARY
Location: Latitude 47.484463, Longitude -122.194123
Local Jurisdiction King County
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 50
Wetland Size 0.98 acres
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 8.4L-W
Upland Data Sheet (s) SP 8.4L-U
Flag color Pink
Dominant
Vegetation
Wetland 8.4L is dominated by an emergent vegetation community with creeping
bentgrass, reed canarygrass, and giant horsetail. Himalayan blackberry is also
present.
Soils
Soils in Wetland 8.4L consists of 6 inches of very dark grayish brown (10YR 3/2) silt
loam and at least 11 inches of grayish brown (2.5Y 5/2) silt loam with redoximorphic
features. Wetland 8.4L meets hydric soil indicators for a Depleted Matrix (F3).
Hydrology
No soil saturation was observed at the sample plot; however, evidence of surface
ponding including sediment deposit (B2) and water stained leaves (B9) were present
within the wetland. A high-water table is the primary sources of wetland hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 8.4L were flagged where
indicators of wetland vegetation, hydric soil and wetland hydrology were present.
Rationale for
Local Rating
King County classifies wetlands according to the current Ecology rating system.
Wetland 8.4L is rated Category IV using the Ecology rating system because it provides
moderate water quality (5) and hydrologic (5) functions and low habitat (3) functions,
totaling 15 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 8.4L has moderate potential to improve water quality because the wetland
has an intermittent flowing ditch, over 50 percent of persistent ungrazed plants, and
over 25 percent of seasonal ponding area. Roadways located uphill of the wetland
provide moderate potential to support water quality function of the wetland.
Hydrologic
Wetland 8.4L has low site potential to reduce flooding due to its size and limited live
storage available. However, surrounding landscape provides high potential to maintain
hydrologic functions of the wetland.
Habitat
Wetland 8.4L has low potential to provide habitat for wildlife due to low species
diversity and lack of habitat interspersion. No special habitat features were present in
the wetland. Surrounding landscape provides limited accessible habitat and
undisturbed habitat around the wetland.
Buffer
Condition
The buffer west of Wetland 8.4L is less than 50 feet wide as it is cut off by BNSF
railroad track. The remaining portion of the vegetated buffer is dominated by black
cottonwood and big-leaf maple with an understory of deer fern (Pteridium aquilinum).
I-405 Wetland and Stream Assessment Report Page 37
Table 28. Wetland 8.05R Summary
WETLAND 8.05R – INFORMATION SUMMARY
Location: Latitude 47.540825, Longitude -122.194956
Local Jurisdiction King
County/Newcastle
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 50/40 feet
Wetland Size 0.05 acre
Cowardin
Classification PEM
HGM Classification Slope
Wetland Data Sheet(s) SP 8.05R-W
Upland Data Sheet (s) SP 8.05R-U
Flag color N/A
Dominant
Vegetation
Wetland 8.05R is dominated by an emergent vegetation community with reed
canarygrass. Some Himalayan blackberries are present along the edges.
Soils
Soils in Wetland 8.05R consist of 11 inches of very dark grayish brown (10YR 3/2)
sandy loam and 7 inches of dark grayish brown (2.5Y 4/2) sandy loam. No
redoximorphic features were present, but both layers had positive reaction to alpha-
alpha-dipyridyl strips, indicating that soils are hydric.
Hydrology
Soils were saturated to the surface, and water table was present at 9 inches in the soil
pit. Groundwater discharge from hillside seeps is the primary source of wetland
hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 8.05R were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
King County and the City of Newcastle both classify wetlands according to the current
Ecology rating system. Wetland 8.05R is rated Category IV using the Ecology rating
system because it provides low water quality (4), hydrologic (4), and habitat (3)
functions, totaling 11 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 8.05 R has moderate site potential to improve water quality as it has over 90
percent of dense, uncut herbaceous plants. However, upslope land uses are vegetated
and have low potential to support the water quality functions. Wetland 8.05R lacks a
surface outlet and does not discharge into any water bodies.
Hydrologic
Wetland 8.05R has moderate site potential to reduce flooding and erosion due to the
presence of dense, uncut, rigid plants. Upslope land uses are vegetated and are not
likely to generate excess surface runoff, resulting in low potential to support the
hydrologic functions of the wetland
Habitat
Wetland 8.05R has low potential to provide habitat for wildlife due to its size, low
species diversity, and no habitat interspersion. Accessible habitat and undisturbed
habitat are limited around the wetland due to the surrounding land uses.
Buffer
Condition
The vegetated portion of the buffer is located east of Wetland 5.0R as I-405 cuts off
the western portion of the buffer. The vegetated buffer is dominated by Douglas fir,
Himalayan blackberry, and beaked hazelnut.
I-405 Wetland and Stream Assessment Report Page 38
Table 29. Wetland 8.2L Summary
WETLAND 8.2L – INFORMATION SUMMARY
Location: Latitude 47.54192737, Longitude -122.1961163
Local Jurisdiction King County
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 50 feet
Wetland Size 0.01 acres
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 8.2L-W
Upland Data Sheet (s) SP 8.2L-U
Flag color N/A
Dominant
Vegetation
Wetland 8.2L is dominated by Himalayan blackberry, reed canarygrass, slough sedge,
and ladyfern.
Soils
Soils in Wetland 8.2L consist of 5 inches of black (10YR2/1) sandy loam over 13
inches of very dark gray (10YR3/1) sandy loam with redoximorphic features. Soils
meet hydric indicator for presence of Hydrogen Sulfide (A4).
Hydrology
Soils were saturated at the surface (A1). Signs of surface water ponding were
observed at 3 inches (A1). The primary sources of hydrology for this wetland include
seeps emanating from the adjacent hillslope.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 8.2L were verified with a
GPS device where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
King County classifies wetlands according to the current Ecology rating system.
Wetland 8.2L is rated Category IV using the Ecology rating system because it provides
moderate water quality (5) and low hydrologic (4) functions and low habitat (3)
functions, scoring 12 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 8.2L has moderate potential to improve water quality as it has a slightly
constricted surface outlet, the wetland has persistent, ungrazed plants greater than
half the area, and over 50 percent of the wetland has seasonal ponding. Surrounding
landscape provides moderate potential to support the water quality.
Hydrologic
Wetland 8.2L has low potential to reduce flooding and erosion due to its minimal depth
of storage capacity during wet periods and a larger contributing basin. Surrounding
areas provide moderate potential to support the hydrologic functions, but there are no
flooding problems downstream of the wetland.
Habitat
Wetland 8.2L has low potential to provide habitat for wildlife due to a single Cowardin
plant structure and no habitat interspersion. No special habitat features or WDFW
Priority Habitats were observed or documented in the wetland.
Buffer
Condition
Wetland 8.2L is bounded by BNSF railroad track to the west. The vegetated portion on
east of Wetland 8.2L is dominated by big leaf maple, beaked hazelnut, ocean spray
(Holodiscus discolor), Himalyan blackberry, and swordfern.
I-405 Wetland and Stream Assessment Report Page 39
Table 30. Wetland 8.5L Summary
WETLAND 8.5L – INFORMATION SUMMARY
Location: Latitude 47.547601, Longitude -122.19615
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width N/A
Wetland Size 0.003 acres
Cowardin
Classification PEM
HGM Classification Slope
Wetland Data Sheet(s) SP 8.5L-W
Upland Data Sheet (s) SP 8.5L-U
Flag color N/A
Dominant
Vegetation
Wetland 8.5L is dominated by an emergent vegetation community with reed
canarygrass, giant horsetail, and climbing nightshade.
Soils
Soils in Wetland 8.5L consists of very dark grayish brown (10YR 3/2) sandy loam with
redoximorphic features and 10 inches of dark greenish gray (Gley1 4/10Y) sandy loam.
Soils in Wetland 8.5L meets hydric soil indicators for a Loamy Gleyed Matrix (F2).
Hydrology Soils were saturated to the surface in the soil pit. The primary sources of hydrology
include groundwater discharge from hillside seeps and runoff from adjacent roadway.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 8.5L were verified with a
GPS device where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 8.5L is rated Category IV using the Ecology rating system because it
provides low water quality (4), hydrologic (4), and habitat (3) functions, scoring 11
points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 8.5L has low potential to improve water quality due to its steepness. Some
dense, uncut, herbaceous plants are present in the wetland. Adjacent roadways
provide moderate potential to support the water quality functions.
Hydrologic
Wetland 8.5L has low potential to reduce flooding and stream erosion due to lack of
dense, uncut, rigid plants. Surrounding landscape provides moderate potential to
support hydrologic functions.
Habitat
Wetland 8.5L has low potential to provide habitat for wildlife due to its size, low species
diversity, and lack of habitat interspersion. Accessible habitat and undisturbed habitat
are limited around Wetland 8.5L due to the presence of roadways adjacent to the
wetland.
Buffer
Condition
The City of Bellevue does not require buffers for Category IV wetlands that are less
than 2,500 square feet. Wetland 8.5L is approximately 138 square feet.
I-405 Wetland and Stream Assessment Report Page 40
Table 31. Wetland 8.6R Summary
WETLAND 8.6R – INFORMATION SUMMARY
Location: Latitude 47.548853, Longitude -122.194997
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width N/A
Wetland Size 0.01 acres
Cowardin
Classification PSS
HGM Classification Depressional
Wetland Data Sheet(s) SP 8.6R-W
Upland Data Sheet (s) SP 8.6R-U
Flag color N/A
Dominant
Vegetation
Wetland 8.6R is dominated by a scrub-shrub vegetation community consisting of
salmonberry, Himalayan blackberry, black cottonwood saplings, giant horsetail, and
scouring rush (Equisetum hyemale).
Soils
Soils in Wetland 8.6R consists of 8 inches of very dark grayish brown (10YR 3/2)
sandy loam and 10 inches of dark grayish brown (10YR 4/2) sandy loam with
redoximorphic features. Wetland 8.6R meets hydric soil indicators for a Depleted
Matrix (F3).
Hydrology Soil saturation was present at 8 inches below the surface. A high-water table is likely
the primary source of hydrology for this wetland.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 8.6R were verified with a
GPS device where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 8.6R is rated Category III using the Ecology rating system because it
provides moderate water quality (5) and hydrologic (5) functions and low habitat (4)
functions, scoring 14 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 8.6R has moderate potential to improve water quality because it has an
intermittently flowing ditch, over 50 percent of persistent ungrazed plants, and over 25
percent of seasonal ponding area. Surrounding landscape provides moderate potential
to support the water quality functions.
Hydrologic
Wetland 8.6R has limited potential to reduce flooding due to limited amount of live
storage available. Surrounding landscape provide the potential to support the
hydrologic functions.
Habitat
Wetland 8.6R has low potential to provide habitat for wildlife due to low species
diversity and lack of habitat interspersion. Accessible habitat and undisturbed habitat
around Wetland 8.6R are limited.
Buffer
Condition
The City of Bellevue does not require buffers for Category IV wetlands that are less
than 2,500 square feet. Wetland 8.6R is approximately 580 square feet.
I-405 Wetland and Stream Assessment Report Page 41
Table 32. Wetland 8.44L Summary
WETLAND 8.44L – INFORMATION SUMMARY
Location: Latitude 47.546715, Longitude -122.196207
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.1 acres
Cowardin
Classification PEM
HGM Classification Slope
Wetland Data Sheet(s) SP 8.44L-W
Upland Data Sheet (s) SP 8.44L-U
Flag color N/A
Dominant
Vegetation
Wetland 8.44L is dominated by an emergent vegetation community that consists of
American brooklime, lady fern, reed canarygrass, bird’s-foot trefoil, climbing
nightshade, and giant horsetail.
Soils
Soils in Wetland 8.44L consist of 4 inches of very dark grayish brown (10YR 3/2)
sandy loam, 4 inches of dark grayish brown (10YR 4/2) sandy loam with redoximorphic
features, and 10 inches of very dark greenish gray (Gley1 3/10Y) sandy clay loam.
Positive reaction to alpha-alpha-dipyridyl strip was observed in both profiles. Soils in
Wetland 10.25LA are considered problematic; however, positive reaction to alpha-
alpha-dipyridyl strip indicates that the soils are hydric
Hydrology Soil was saturated to the surface in the sample plot. Groundwater discharge from
hillside seeps is likely the primary source of wetland hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 8.44L were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 8.44L is rated Category IV using the Ecology rating system because
it provides moderate water quality (6) functions, low hydrologic (4) functions, and low
habitat (4) functions, scoring 14 points on the rating form
Wetland Functions Summary
Water Quality
Wetland 8.44L has moderate potential to improve water quality due to the presence of
over 90 percent of dense, uncut, herbaceous plants. Roadways located uphill of the
wetland provide moderate potential to support the water quality functions.
Hydrologic
Wetland 8.44L has low potential to reduce flooding and stream erosion due to lack of
over 90 percent of dense, uncut, rigid plants. Hydrologic functions of the wetland are
supported by the roadways located upslope of the wetland.
Habitat
Habitat functions provided by Wetland 8.44L are limited due to low species diversity
and lack of habitat interspersion. No special habitat features were observed in the
wetland. Due to its close proximity to Lake Washington, surrounding landscape
provides moderate potential to support habitat functions of the wetland.
Buffer
Condition
Western and some eastern portions of the Wetland 8.44L buffers are less than 40 feet
wide as the wetland is bounded by Lake Washington Boulevard Trail to the east and
BNSF railroad track to the west. The vegetated portion of the buffer is dominated by
big-leaf maple, black cottonwood, beaked hazelnut, choke cherry, thimbleberry (Rubus
parviflorus), Himalayan blackberry, sword fern, and trailing blackberry.
I-405 Wetland and Stream Assessment Report Page 42
Table 33. Wetland 8.75L Summary
WETLAND 8.75L – INFORMATION SUMMARY
Location: Latitude: 47.551300, Longitude: -122.196815
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.05 acres
Cowardin
Classification PEM1
HGM Classification Depressional
Wetland Data Sheet(s) SP 8.75L-W
Upland Data Sheet (s) SP 8.75L-U
Flag color N/A
Dominant
Vegetation
Wetland 8.75L is dominated by climbing nightshade (Solanum dulcamara) and
willowherb. Small amounts of giant horsetail, soft rush, and lady fern are alos present.
Soils
Soils in Wetland 8.75L consists of 14 inches of very dark gray (10YR 3/1) sandy loam,
over 6 inches of dark gray (Gley1 4/10Y) sandy loam. Wetland 8.75L meets hydric soil
indicators for presence of Hydrogen Sulfide (A4) and Loamy Gleyed Matrix (F2).
Hydrology
Soils were saturated at the surface (A3) and a High Water Table (A2) was observed in
the sample plot. The primary sources of hydrology for this wetland includes a high
water table and groundwater discharge from hillside seeps.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 8.75L were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 8.75L is rated Category IV using the Ecology rating system because
it provides moderate (5) water quality functions, low (4) hydrologic functions and low
(3) habitat functions, scoring 12 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 8.75L has moderate potential to improve water quality because it has an
intermittently flowing ditch outlet and greater than half of the wetland has persistent,
ungrazed vegetation, and less than half of the wetland is seasonally ponded. The
wetland receives some stormwater runoff from nearby roadways, providing water
quality functions.
Hydrologic
Wetland 8.75L has low potential to reduce flooding and erosion due to an intermittently
flowing ditch outlet and minimal capacity to provide storage during wet periods. The
wetland receives stormwater from the surrounding area, providing some hydrologic
functions. However, there are no documented flooding problems downstream of the
wetland.
Habitat
Wetland 8.75L has low potential to provide habitat for wildlife due to lack of species
diversity and low habitat interspersion. No special habitat features or WDFW priority
habitats are present in the wetland. Wetland 8.75L has limited accessible habitat as it
is surrounded by roadways and railroad track..
Buffer
Condition
The City of Bellevue does not require buffers for Category IV wetlands that are less than 2,500
square feet. Wetland 8.75L is approximately 1,970 square feet.
I-405 Wetland and Stream Assessment Report Page 43
Table 34. Wetland 8.8L Summary
WETLAND 8.8L – INFORMATION SUMMARY
Location: Latitude: 47.551113, Longitude : -122.196228
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.07 acres
Cowardin
Classification PEM/PFO
HGM Classification Depressional
Wetland Data Sheet(s) SP 8.8L-W
Upland Data Sheet (s) SP 8.8L-U
Flag color N/A
Dominant
Vegetation
Wetland 8.8L is dominated by Oregon ash, Himalayan blackberry and reed canary
grass.
Soils
Soils in Wetland 8.8L consists of 7 inches of very dark gray (10YR 3/1) sandy loam
over 12 inches of dark gray (5Y4/1) sandy loam with redoxim orphic features. Wetland
8.8L meets hydric soil indicators for a Depleted Matrix (F3).
Hydrology
Soils were saturated to the surface (A3) and the water table was observed at 8 inches
(A2). A high groundwater table is likely the primary source of hydrology for W etland
8.8L
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 8.8L were verified with a
GPS device where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 8.8L is rated Category IV using the Ecology rating system because it
provides moderate (5) water quality, low (4) hydrology and low (3) habitat functions for
a total of 12 points.
Wetland Functions Summary
Water Quality
Wetland 8.8L has moderate potential to improve water quality as it has an
intermittently flowing ditch outlet and over 95 percent of persistent, ungrazed plants
and over 15 percent of seasonally ponded area. Surrounding landscape provides
moderate potential to support the water quality function of the wetland.
Hydrologic
Wetland 8.8L has low potential to reduce flooding and erosion due to the presence of
an intermittently flowing stream and minimal storage capacity during wet periods.
Hydrologic functions of the wetland are supported by stormwater inputs from the
surrounding area.
Habitat
Wetland 8.8L has low potential to provide habitat for wildlife doe to lack of species
diversity and low habitat interspersion. No special habitat features or WDFW Priority
Habitats were mapped or observed in the wetland. Due to its location in the landscape,
accessible habitat and undisturbed habitat are limited around the wetland.
Buffer
Condition
The vegetated portion of Wetland 8.75L buffer is bounded by 106th Avenue SE to the
east and BNSF railroad track to the west. The buffer of Wetland 8.8L is dominated by
black cottonwood and big leaf maple trees and Himalayan blackberry.
I-405 Wetland and Stream Assessment Report Page 44
Table 35. Wetland 9.5L Summary
WETLAND 9.5L – INFORMATION SUMMARY
Location: Latitude 47.56034424 , Longitude -122.1886577
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width N/A
Wetland Size 0.02 acres
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 9.5L-W
Upland Data Sheet (s) SP 9.5L-U
Flag color N/A
Dominant
Vegetation
Wetland 9.5L is dominated by reed canarygrass. Some creeping bentgrass is also
present in the wetland.
Soils
Soils in Wetland 9.5L consist of 7 inches of very dark brown (10YR 2/2) loam, over a 3-
inch mixed layer of very dark grayish brown (2.5Y3/2) and gray (2.5Y5/1) sandy loam
with redoximorphic features, and anl 8-inch layer of dark gray (2.5Y4/1) sandy loam
with redoximorphic features. Wetland 9.5L meets hydric soil indicators for a Depleted
Matrix (F3).
Hydrology Soils were saturated at 10 inches below the surface. A high groundwater table is likely
the primary source of hydrology for this wetland.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 9.5L were verified with a
GPS device where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 9.5L is rated Category IV using the Ecology rating system because it
provides moderate water quality (5) and hydrologic (5) functions and low habitat (3)
functions, scoring 13 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 9.5L has moderate potential to improve water quality as it is a depression with
no surface water leaving it and has over 50 percent of persistent, ungrazed plants. The
wetland does not directly receive stormwater but some runoff may reach Wetland 9.5L
from nearby roadways.
Hydrologic
Wetland 9.5L has moderate potential to reduce flooding and erosion due to lack of an
outlet. Nearby roadways generate some excess runoff that provide Wetland 9.5L with
moderate potential to support hydrologic functions. There are no problems with
flooding downstream of the wetland.
Habitat
Wetland 9.5L has low potential to provide habitat for wildlife due to low species
diversity and no habitat interspersion. No special habitat features were observed in the
wetland. Surrounding land uses including highways, local roads, and residential
houses limit accessible habitat and undisturbed habitat around the wetland.
Buffer
Condition
The City of Bellevue does not require buffers for Category IV wetlands that are less than 2,500
square feet. Wetland 9.5L is approximately 695 square feet.
I-405 Wetland and Stream Assessment Report Page 45
Table 36. Wetland 9.68L Summary
WETLAND 9.68L – INFORMATION SUMMARY
Location: Latitude 47.563406, Longitude -122.187624
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 110 feet
Wetland Size 0.1 acres
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 9.68-W
Upland Data Sheet (s) SP 9.68-U
Flag color N/A
Dominant
Vegetation
Wetland 9.68L is dominated by a plant emergent vegetation community that consists of
Kentucky blue grass, lady fern, giant horsetail, and American brooklime.
Soils
Soils in Wetland 9.68L consists of 8 inches of dark grayish brown (10YR 3/2) silt loam
and 10 inches of grayish brown (2.5Y 5/2) silty clay loam with redoximorphic features.
Soils in Wetland 9.68L meets hydric soil indicators for a Depleted Matrix (F3).
Hydrology
No soil saturation was observed at the sample plot during the field investigation in
June 2016. However, water stained leaves (B9) were also observed within the wetland.
High groundwater table is the primary source of wetland hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 9.68L were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 9.68L is rated Category IV using the Ecology rating system because
it provides moderate water quality (5), hydrologic (6), and habitat (5) functions, scoring
16 points on the rating form
Wetland Functions Summary
Water Quality
Wetland 9.68L has moderate potential to improve water quality as it has an
intermittently flowing ditch, over 50 percent of persistent ungrazed plants, and over 25
percent of seasonal ponding area. Surrounding landscape provides moderate potential
to support the water quality functions.
Hydrologic
Wetland 9.68L has moderate potential to reduce flooding and erosion since it has a
smaller contributing basin. Surrounding landscape provides high potential to maintain
hydrologic functions of the wetland.
Habitat
Wetland 9.68L has low potential to provide habitat for wildlife because it has low
species diversity and lacks habitat interspersion. No special habitat features were
observed in the wetland. Surrounding landscape provides limited accessible habitat
and undisturbed habitat around the wetland. Wetland 9.68L provides a moderate value
for wildlife due to its close proximity to Lake Washington and lake fringe riparian
habitat.
Buffer
Condition
Wetland 9.68L is bounded by 106th Avenue SE to the north and east and BNSF
railroad track to the west; therefore, the vegetated portions of northern, eastern, and
western buffers are less than 110 feet wide. The vegetated portion of the buffer is
dominated by Himalayan blackberry, common snowberry (Symphoricarpos albus), and
thimbleberry. Red alder and big-leaf maple trees, giant horsetail, and sword fern are
also present.
I-405 Wetland and Stream Assessment Report Page 46
Table 37. Wetland 9.82L Summary
WETLAND 9.82L – INFORMATION SUMMARY
Location: Latitude 47.565444, Longitude -122.185959
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 110 feet
Wetland Size 0.17 acres
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 9.82L-W
Upland Data Sheet (s) SP 9.82L-U
Flag color Pink/Orange
Dominant
Vegetation
Wetland 9.82L is dominated by an emergent vegetation community that consists of
reed canarygrass, giant horsetail, and Kentucky blue grass. Different-leaved water-
starwort (Callitriche verna) is also present in the ponded area.
Soils
Soils in Wetland 9.82L consists of 5 inches of organic layer, 6 inches of dark gray
(2.5Y 4/1) sand, 3 inches of black (5Y 2.5/1) silt loam, and 5 inches of dark gray (5Y
4/1) sand. A positive reaction to Alpha-alpha-dipyridyl strip was also observed in the
second sand layer, indicating that soils are hydric.
Hydrology
Saturated soils and water table were present at the soil surface, and surface water was
present near the sample plot. Groundwater discharge from hillside seeps and a high-
water table are the primary sources of wetland hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 9.82L were verified and
re-delineated where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 9.82L is rated Category IV using the Ecology rating system because
it provides moderate water quality (7) and hydrologic (5) functions and low habitat (4)
functions, scoring 16 points on the rating form
Wetland Functions Summary
Water Quality
Wetland 9.82L has high potential to improve water quality as it has an intermittently
flowing ditch running through, organic soils, over 50 percent of persistent, ungrazed
plants, and over 50 percent of seasonally ponding area. Surrounding landscape
provides moderate potential to support the water quality functions. Wetland 9.82L
discharges into an unnamed tributary to Lake Washington. This stream drains into
Lake Washington approximately 0.25 mile west. The discharging location of Lake
Washington is on the 303(d) list.
Hydrologic
Wetland 9.82L has moderate potential to reduce flooding and erosion as it has some
live storage capacity available and has a smaller contributing basin. Surrounding
landscape also provides moderate potential to support the hydrologic functions.
Habitat
Wetland 9.82L has low potential to provide habitat for wildlife due to low species of
diversity and lack of habitat interspersion. Accessible habitat and undisturbed habitat
are limited around the wetland. Wetland 9.82L provides a moderate value for wildlife
as it is located in close proximity to the shoreline riparian habitat.
Buffer
Condition
Wetland 9.82L is bounded by Lake Washington Boulevard Trail to the east and BNSF
railroad track to the west; therefore, the vegetated portions of eastern and western
buffers are less than 110 feet wide. The vegetated portion of the buffer is dominated by
beaked hazelnut, thimbleberry, Himalayan blackberry, sword fern, and sticky-willy.
I-405 Wetland and Stream Assessment Report Page 47
Table 38. Wetland 10.0L Summary
WETLAND 10.0L – INFORMATION SUMMARY
Location: Latitude 47.567075, Longitude --122.18222
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 110 feet
Wetland Size 0.34 acres
Cowardin
Classification PEM/PFO
HGM Classification Depressional
Wetland Data Sheet(s) SP 10.0L-W
Upland Data Sheet (s) SP 10.0L-U
Flag color Pink
Dominant
Vegetation
Wetland 10.0L is dominated by emergent and forested vegetation communities. The
emergent community is dominated by reed canarygrass. The forested community is
dominated by black cottonwood and red alder with an understory of salmonberry,
Himalayan blackberry, and reed canarygrass.
Soils
Soils in Wetland 10.0L consist of 7 inches of very dark grayish brown (10YR 3/2) silt
loam and at least 12 inches of grayish brown (10YR 5/2) silt loam with redoximorphic
features. Wetland 10.0L meets hydric soil indicators for a Depleted Matrix (F3).
Hydrology
Surface water is present at the south end of the wetland where recent beaver activity
was observed. A narrow seasonal drainage channel runs through this wetland and
drains into Coal Creek.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 10.0L were delineated
where indicators of wetland vegetation, hydric soil and wetland hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating system.
Wetland 10.0L is rated Category III because it provides moderate water quality (7),
hydrologic (6), and habitat (5) functions, scoring 18 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 10.0L provide moderate potential to improve water quality as it has an
intermittently flowing stream, over 50 percent of persistent, ungrazed plants, and over 25
percent of seasonally ponded area. Surrounding land uses such as I-405 generate
pollutants, providing moderate landscape potential to support water quality functions.
Wetland 10.0L directly discharges into Coal Creek, providing the wetland a high
opportunity for water quality improvement.
Hydrologic
Wetland 10.0L has moderate potential to reduce flooding and erosion as the wetland
has some storage capacity available to retain surface water and has a smaller
contributing basin. Surrounding land uses provide moderate potential to support
hydrologic functions of the wetland. Newport shores located along the lower part of Coal
Creek are known to have flooding issues; therefore, this wetland has an opportunity to
reduce flooding
Habitat
Wetland 10.0L has moderate potential to provide habitat for wildlife as it has multiple
Cowardin classes and hydroperiods. Special habitat features including large downed
woody debris, standing snags, overhanging vegetation over the seasonal drainage
channel, and signs of recent beaver activity were observed in the wetland. Wetland
10.0L has limited accessible habitat as it is bounded by the trail and the BNSF track, and
surrounding land uses provide limited undisturbed habitat around the wetland. Wetland
10.0L provides a moderate value for wildlife as it is in close proximity to Coal Creek.
Buffer
Condition
Wetland 10.0L is bounded by Lake Washington Boulevard Trail to the east and BNSF
railroad track to the west; therefore, the vegetated portions of eastern and western
buffers are less than 110 feet wide. The vegetated portion of the buffer is dominated by
big-leaf maple, black cottonwood, Himalayan blackberry, sword fern, and creeping
bentgrass.
I-405 Wetland and Stream Assessment Report Page 48
Table 39. Wetland 10.01R Summary
WETLAND 10.01R – INFORMATION SUMMARY
Location: Latitude 47.566091, Longitude -122.182021
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 110 feet
Wetland Size 0.08 acres
Cowardin
Classification PSS
HGM Classification Depressional
Wetland Data Sheet(s) SP 10.01R-W
Upland Data Sheet (s) SP 10.01R-U
Flag color N/A
Dominant
Vegetation
Wetland 10.01R is dominated by Sitka willow, Scouler’s willow, twinberry (Lonicera
involucrata), and Himalayan blackberry. English holly is also present in the wetland.
Soils
Soils in Wetland 10.01R consists of 6 inches of very dark gray (10YR 3/1) sandy loam,
4 inches of dark gray (Gley1 4/10Y) sandy loam with redoximorphic features, and 8
inches of brown (10YR 4/3) sandy loam with redoximorphic features. Wetland 10.01R
meets hydric soil indicators for a Loamy Gleyed Matrix (F2).
Hydrology
Sols were saturated at 16 inches below the surface. Signs of surface water ponding
such as water marks (B1) and water stained leaves (B9) were observed. The primary
sources of hydrology for this wetland include a high-water table and a drainage
channel located at the south end of the wetland.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 10.01R were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 10.01R is rated Category III using the Ecology rating system because
it provides moderate water quality (6) and hydrologic (6) functions and low habitat (5)
functions, scoring 17 points on the rating form
Wetland Functions Summary
Water Quality
Wetland 10.01R has moderate potential to improve water quality as it has an
intermittently flowing stream on the north end, over 95 percent of persistent, ungrazed
plants, and over 50 percent of seasonal ponding area. Highways adjacent to the
wetland also provide moderate potential to support the water quality functions of the
wetland. Wetland 10.01R does not directly discharge into Coal Creek, which is on the
303(d) list; however, the wetland is located within the Coal Creek basin.
Hydrologic
Wetland 10.01R has moderate potential to reduce flooding and erosion due to the
presence of intermittently flowing stream and some storage capacity. Highways
adjacent to the wetland provide moderate potential to support hydrologic functions of
the wetland. Newport shores located along the lower part of Coal Creek are known to
have flooding issues; therefore, this wetland has an opportunity to reduce flooding.
Habitat
Wetland 10.01R has low potential to provide habitat for wildlife due to low species
diversity and no habitat interspersion. No special habitat features were observed in the
wetland. Surrounding land uses including highways, local roads, and residential
houses limit accessible habitat and undisturbed habitat around the wetland. A stream
located on the south end of the wetland and in close proximity to the forested habitat
associated with Coal Creek give this wetland a high value for wildlife.
Buffer
Condition
The buffer of Wetland 10.01R is dominated by Himalayan blackberry. Some
ornamental and landscaping trees are also present. The western portion of the buffer
is less than 110 feet as it is cut off by I-405.
I-405 Wetland and Stream Assessment Report Page 49
Table 40. Wetland 10.05R Summary
WETLAND 10.05R – INFORMATION SUMMARY
Location: Latitude 47.566248, Longitude -122.179709
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 110 feet
Wetland Size 1.9acres
Cowardin
Classification PFO
HGM Classification Slope
Wetland Data Sheet(s) SP 10.05R-W
Upland Data Sheet (s) SP 10.05R-U
Flag color Pink
Dominant
Vegetation
Wetland 10.05R is dominated by a forested vegetation community that consists of red
alder with an understory of vine maple (Acer circinatum), salmonberry, black
gooseberry (Ribes divaricatum), red cedar saplings, slough sedge, and reed
canarygrass. Himalayan blackberry is also present near the wetland boundary.
Soils
Soils in Wetland 10.05R consists of 10 inches of black (10YR 2/1) silt loam and 8
inches of greenish black (Gley1 2.5/10Y) sandy clay loam. Both layers had positive
reactions to alpha-alpha-dipyridyl strips, indicating that hydric soil is present.
Hydrology
Soils were saturated to the surface in the soil pit. The primary sources of hydrology
include groundwater discharge from hillside seeps. Only a small portion of the wetland
gets flooded by overbank flooding from Newport Creek and Coal Creek.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 10.05R were verified and
re-delineated where indicators of wetland vegetation, hydric soil and wetland hydrology
were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 10.05R is rated Category III using the Ecology rating system because
it provides moderate water quality (6), hydrologic (5), and habitat (6) functions, scoring
17 points on the rating form
Wetland Functions Summary
Water Quality
Wetland 10.05R has low site potential to improve water quality due to kits steepness
and lack of dense, uncut, herbaceous plants. Residential houses located uphill of the
wetland provide moderate potential to support the water quality functions of the
wetland. Wetland 10.05R directly discharges into Coal Creek, providing the wetland a
high opportunity for water quality improvement.
Hydrologic
Wetland 10.05R provides low site potential to reduce flooding and stream erosion due
to limited presence of dense, uncut, rigid plants. Roadway and residential houses
located upslope of the wetland provide moderate potential to support hydrologic
functions of the wetland. Newport shores located along the lower part of Coal Creek
are known to have flooding issues; therefore, this wetland has an opportunity to reduce
flooding.
Habitat
Wetland 10.05R has low site potential to provide habitat for wildlife because it has one
Cowardin class and low interspersion of habitats. Overhanging plants over the streams
are observed in the wetland. Middle and upper parts of the Coal Creek basin still have
intact forest habitat; therefore, the surrounding landscape provides moderate potential
to support habitat functions of this wetland. Presence of the streams and forested
habitat associated with Coal creek give this wetland a higher value for wildlife.
Buffer
Condition
The buffer of Wetland 10.05R is dominated by big-leaf maple and red alder with an
understory of salmonberry, cascara, and Himalayan blackberry. The western and
southern portions of the wetland is less than 110 feet as the area is cut off by 119th
Avenue SE and residential houses.
I-405 Wetland and Stream Assessment Report Page 50
Table 41. Wetland 10.9L Summary
WETLAND 10.9L – INFORMATION SUMMARY
Location: Latitude 47.578749, Longitude -122.175819
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.07 acres
Cowardin
Classification PSS
HGM Classification Depressional
Wetland Data Sheet(s) SP 10.9L-W
Upland Data Sheet (s) SP 10.9L-U
Flag color N/A
Dominant
Vegetation
Wetland 10.9L is dominated by a scrub-shrub vegetation community that consists of
Himalayan blackberry and reed canarygrass, and tall fescue (Schedonorus
arundinaceus).
Soils
Soils in Wetland 10.9L consist of 4 inches of very dark grayish brown (10YR 3/2)
sandy loam, 6 inches of dark grayish brown (10YR 4/2) sandy loam, 6 inches of dark
grayish brown (2.5Y 4/2) sandy loam with redoximorphic features, and at least 2
inches of dark grayish brown (2.5Y 4/2) sandy loam. Wetland 10.9L meets hydric soil
indicator for a Depleted Matrix (F3).
Hydrology
No soil saturation or water table was observed in the sample plot. A high-water table is
likely the primary source of hydrology. This wetland may have been getting drier due to
the construction of a new storm water pond located east of the wetland. However, it is
assumed that the wetland would still have hydrology during the early growing season.
Therefore, wetland hydrology is assumed to be present.
Rationale for
Delineation
Wetland vegetation and hydric soils are present, and wetland hydrology is assumed to
be present in the wetland. The boundaries of Wetland 10.9L were verified with a GPS
unit.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 10.9L is rated Category IV using the Ecology rating system because
it provides moderate water quality (6) and hydrologic (5) functions, and low habitat (3)
functions, scoring 14 points on the rating form
Wetland Functions Summary
Water Quality
Wetland 10.9L has a moderate potential to improve water quality due to lack of an
outlet and presence of persistent, ungrazed plants. I-90 on-ramp and residential
houses around the wetland also provide moderate potential to support the water
quality functions of the wetland. Although this wetland does not directly discharge into
any impaired water bodies, it is located in the Mercer Slough basin, and Mercer Slough
is on the 303(d) list.
Hydrologic
Wetland 10.9L has a moderate potential to reduce flooding and erosion due to lack of
an outlet and a smaller size of the contributing basin. Surrounding land uses also
provide moderate potential to support hydrologic functions of this wetland.
Habitat
Wetland 10.9L has low potential to provide habitat for wildlife due to lack of species
diversity and habitat interspersion. No special habitat features were observed in the
wetland. Accessible habitat and undisturbed habitat are limited around the wetland due
to the location of the wetland near highways and residential houses.
Buffer
Condition
Wetland 10.9L is bounded by an access road to the north and east and residential
houses to the west. The vegetation portion of the buffer is dominated by Himalayan
blackberry, Kentucky blue grass, sweet vernal grass (Anthoxanthum odoratum), sword
fern, and tall fescue.
I-405 Wetland and Stream Assessment Report Page 51
Table 42. Wetland 10.16L Summary
WETLAND 10.16L – INFORMATION SUMMARY
Location: Latitude 47.568527, Longitude -122.18073
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 60
Wetland Size 0.14
Cowardin
Classification PSS
HGM Classification Depressional
Wetland Data Sheet(s) SP 10.16L-W
Upland Data Sheet (s) SP 10.16L-U
Flag color N/A
Dominant
Vegetation
Wetland 10.16L is dominated by a scrub-shrub vegetation community that consists of
red-osier dogwood and coastal black gooseberry with an understory of skunk cabbage,
giant horsetail, and reed canarygrass.
Soils
Soils in Wetland 10.16L consist of 7 in. of black (2.5Y 2.5/1) silt loam, 2 in. of dark gray
(Gley1 4/N) silty clay loam, and 9 in. of dark greenish gray (Gley1 4/10Y) sand. Sulfidic
odor was present at 7 in. below the soil surface. Wetland 10.16L meets hydric soil
indicators for a Hydrogen Sulfide (A4) and a Loamy Gleyed Matrix (F2).
Hydrology
Soils were saturated to the surface, and water table was present at 10 in. in the soil pit.
Surface water was also present at the soil pit. Primary sources of wetland hydrology
include a high-water table and groundwater discharge from hillside seeps on the north
side of 118th Avenue.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 10.16L were verified with
a GPS device where indicators of wetland vegetation, hydric soil, and wetland
hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 10.16L is rated Category III using the Ecology rating system because
it provides moderate water quality (7) and hydrologic (7) functions and low habitat (4)
functions, totaling 18 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 10.16L has moderate potential to improve water quality because it has an
intermittently flowing stream, over 50 percent of persistent ungrazed plants, and over
25 percent of seasonally ponding area. The adjacent roadway provides moderate
potential to support the water quality function of the wetland. Wetland 10.16L directly
discharges into Coal Creek, providing the wetland a high opportunity for water quality
improvement. Coal Creek is on the 303(d) list.
Hydrologic
Wetland 10.16L has moderate potential to reduce flooding and erosion as the wetland
has some storage capacity available to retain surface water and has a smaller
contributing basin. Surrounding land uses provide high potential to support hydrologic
functions. Newport shores located along the lower part of Coal Creek are known to
have flooding issues; therefore, this wetland has an opportunity to reduce flooding.
Habitat
Wetland 10.16L has low potential to provide habitat for wildlife due to low species
diversity and lack of habitat interspersion. Special habitat features including large
downed woody debris and overhanging vegetation over the seasonal drainage channel
were observed in the wetland. Wetland 10.16L has limited accessible habitat as it is
bounded by the trail and the BNSF track. Undisturbed habitat in 1 km. of the wetland is
limited to riparian corridor along Coal Creek and Newport Creek Lake Washington
shorelines. Wetland 10.16LL has moderate value to society as it is in close proximity to
Coal Creek.
I-405 Wetland and Stream Assessment Report Page 52
WETLAND 10.16L – INFORMATION SUMMARY
Buffer
Condition
The buffers of Wetland 10.16L are less than 60 ft. wide as the wetland is bounded by
Lake Washington Boulevard Trail to the east and BNSF railroad track to the west. The
vegetated portion of the wetland buffer is dominated by big-leaf maple, black
cottonwood, and red alder trees with an understory of English ivy, sword fern, and
giant horsetail
I-405 Wetland and Stream Assessment Report Page 53
Table 43. Wetland 10.25LA Summary
WETLAND 10.25LA – INFORMATION SUMMARY
Location: Latitude 47.56928, Longitude -122.180088
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width N/A
Wetland Size 0.02 acre
Cowardin
Classification PEM
HGM Classification Slope
Wetland Data Sheet(s) SP 10.25LA-W
Upland Data Sheet (s) SP 10.25LA-U
Flag color Pink
Dominant
Vegetation
Wetland 10.25LA is dominated by an emergent vegetation community that consists of
giant horsetail, soft rush, slough sedge, and red fescue (Festuca rubra). Himalayan
blackberry is present at the north end of the wetland.
Soils
Soils in Wetland 10.25LA consists of 6 inches of very dark gray (10YR 3/1) sandy loam
and 6 inches of dark gray (10YR 4/1) sandy loam. Positive reaction to an alpha-alpha-
dipyridyl strip was observed in the second sand layer. Soils in Wetland 10.25LA are
considered problematic; however, positive reaction to the alpha-alpha-dipyridyl strip
indicates that the soils are hydric.
Hydrology Soils were saturated at 6 inches from the surface. Groundwater discharge from hillside
seeps is the primary source of wetland hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 10.25LA were delineated
where indicators of wetland vegetation, hydric soil and wetland hydrology were
present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 10.25LA is rated Category IV using the Ecology rating system
because it provides moderate water quality (6) functions and low hydrology (4) and
habitat (4) functions, scoring 14 points on the rating form
Wetland Functions Summary
Water Quality
Wetland 10.25LA provides moderate potential to improve water quality as it has over
90 percent of dense, uncut, herbaceous plants. Adjacent roadway provides moderate
potential to support water quality functions of the wetland. Wetland 10.25LA does not
directly discharge into Coal Creek, which is on the 303(d) list. However, this wetland is
located in the Coal Creek basin, providing the wetland a moderate opportunity for
water quality improvement.
Hydrologic
Wetland 10.25LA has low potential to reduce flooding as it lacks over 90 percent of
dense, uncut, rigid plants. Surrounding land uses provide low potential to support
hydrologic functions as roadway and pavements cover less than 25 percent of the area
within 150 feet upslope of the wetland. Newport shores located along the lower part of
Coal Creek are known to have flooding issues; therefore, this wetland has an
opportunity to reduce flooding.
Habitat
Wetland 10.25LA has low potential to provide habitat for wildlife due to its size, its
location, low species diversity, and lack of habitat interspersion. No special habitat
features were observed in the wetland. Surrounding land uses provide limited
accessible habitat and undisturbed habitat. Proximity to Coal Creek gives this wetland
a moderate value for wildlife.
Buffer
Condition
The City of Bellevue does not require buffers for Category IV wetlands that are less
than 2,500 square feet. Wetland 10.25LA is approximately 1,500 square feet.
I-405 Wetland and Stream Assessment Report Page 54
Table 44. Wetland 10.25LB Summary
WETLAND 10.25LB – INFORMATION SUMMARY
Location: Latitude 47.569035, Longitude --122.179796
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.2 acre
Cowardin
Classification PEM/PFO
HGM Classification Slope
Wetland Data Sheet(s) SP 10.25LB-W
Upland Data Sheet (s) SP 10.25LB-U
Flag color Pink
Dominant
Vegetation
Wetland 10.25LB is comprised of emergent and forested vegetation communities. The
emergent community is dominated by climbing nightshade, watercress (Rorippa
nasturtium-aquaticum), bird’s-foot trefoil, giant horsetail, lady fern, and soft rush.
Common cattail is also present in the wetland. The forested community is dominated
by black cottonwood trees.
Soils
Soils in Wetland 10.25LB consist of 2 inches of black gray (10YR 3/1) sandy loam and
at least 12 inches of grayish brown (2.5Y 5/2) loamy sand with redoximorphic features.
Compacted gravel is present below 14 inches. Soils in Wetland 1.25LB meet hydric
soil indicators for a Depleted Matrix (F3).
Hydrology
Soil saturation and a water table were present at the soil surface. Surface water is
present in the lowest part of the wetland. Groundwater discharge from hillside seeps
and runoff are likely the primary sources of wetland hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 10.25LB were delineated
where indicators of wetland vegetation, hydric soil and wetland hydrology were
present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 10.25LB is rated Category IV using the Ecology rating system
because it provides moderate water quality (5), moderate hydrologic (5), and low
habitat (4) functions, scoring 14 points on the rating form
Wetland Functions Summary
Water Quality
Wetland 10.25LB provides low site potential to improve water quality due to its
steepness and limited presence of dense herbaceous plants. Adjacent roadway
provides moderate potential to support water quality functions of the wetland. Wetland
10.25LB does not directly discharge into Coal Creek, which is on the 303(d) list.
However, this wetland is located in the Coal Creek basin, providing the wetland a
moderate opportunity for water quality improvement.
Hydrologic
Wetland 10.25LB has low site potential to reduce flooding as it lacks over 90 percent of
dense, uncut, rigid plants. Surrounding roadways provide moderate potential to
support hydrologic functions. Newport shores, located along the lower part of Coal
Creek, are known to have flooding issues; therefore, this wetland has an opportunity to
reduce flooding.
Habitat
Wetland 10.25LB has low site potential to provide habitat for wildlife due to its size, its
location, low species diversity, low interspersion of habitats, and lack of special habitat
features. Surrounding land uses limit accessible habitat and undisturbed habitat.
Proximity to Coal Creek gives this wetland a moderate value for wildlife.
Buffer
Condition
Wetland 10.25LB is bounded by 120th Avenue SE to the west, Coal Creek Parkway to
the south, and I-405 off-ramp to the east; therefore, the vegetated buffer of Wetland
10.25LB is limited to the north side of the wetland. The vegetated buffer is dominated
by Himalayan blackberry and giant horsetail.
I-405 Wetland and Stream Assessment Report Page 55
Table 45. Wetland 10.8L Summary
WETLAND 10.8L – INFORMATION SUMMARY
Location: Latitude 47.498915, Longitude -122.195986
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) II
Local Jurisdiction
Rating II
Local Jurisdiction
Buffer Width 115 feet
Wetland Size 100+ acres
Cowardin
Classification PEM/PSS/PFO
HGM Classification Depressional
Wetland Data Sheet(s) SP 10.8L-W
Upland Data Sheet (s) SP 10.8L -U
Flag color pink
Dominant
Vegetation
Wetland 10.8L consists of scrub-shrub and emergent vegetation communities. The
emergent community is dominated by soft rush and creeping bentgrass. Stalk-grain
sedge (Carex stipata) is also present in the wetland. The scrub-shrub community is
dominated by red-osier dogwood and Himalayan blackberry.
Soils
Soils in Wetland 10.8L consist of 10 inches of dark grayish brown (10YR 4/2) sandy
loam with redoximorphic features and at least 6 inches of gray (5Y 5/1) sandy loam
with redoximorphic features. Wetland 10.8L meets hydric soil indicators for a Depleted
Matrix (F3).
Hydrology
No soil saturation or water table was present during the field investigation on May 11,
2016. However, sediment deposits (B2) were observed within the wetland, indicating
hillside seeps are likely the primary source of wetland hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 10.8L were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Renton classifies wetlands according to the current Ecology rating system.
Wetland 10.8L is rated Category IV using the Ecology rating system because the
wetland provides low water quality (4), hydrologic (4), and habitat (3) functions, scoring
11 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 10.8L has low potential to improve water quality due to lack of retention areas
and lack of dense, uncut herbaceous plants. Roadways near the wetland provide
moderate potential to support the water quality functions.
Hydrologic Wetland 10.8L has low potential to reduce flooding and stream erosion due to its
connection to Lake Washington which is managed by the Ballard Locks.
Habitat
Wetland 10.8L has high potential to provide habitat for wildlife due to high species
diversity and lack of special habitat features. Limited accessible habitat and
undisturbed habitat are available around the wetland because the wetland is
surrounded by Houser Way to the west and I-405 to the east.
Buffer
Condition
The vegetated portion of the buffer is dominated by Himalayan blackberry, sword fern
(Polystichum munitum), and trailing blackberry (Rubus ursinus), with some large
patches of coniferous and deciduous forest north of I-90.
I-405 Wetland and Stream Assessment Report Page 56
Table 46. Wetland 118-1 Summary
WETLAND 118-1 – INFORMATION SUMMARY
Location: Latitude 47.573311, Longitude -122.181656
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 60 Feet
Wetland Size 0.07 acres
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 118-1-W
Upland Data Sheet (s) SP 118-1-U
Flag color N/A
Dominant
Vegetation
Wetland 118-1 is dominated by redosier dogwood, smallfruited bulrush (Scirpus
microcarpus) and bittersweet nightshade.
Soils Soils in Wetland 118-1 consists of 24 inches of black (10YR 2/1) sandy loam. Wetland
118-1 meets hydric soil indicator for presence of Hydrogen Sulfide (A4).
Hydrology
Signs of surface water ponding were observed at 2 inches (A1) and the sample plot
was saturated to the surface (A3). Hydrology in Wetland 118-1 is surface water driven.
Water discharges from the adjacent hillslope into the ditch portion of Wetland 118-1
and leaves the wetland through a culvert.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 118-1 were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 118-1 is rated Category III using the Ecology rating system because it
provides moderate water quality (6), moderate hydrologic (7) functions and low habitat
(3) functions, scoring 16 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 118-1 has moderate potential to improve water quality because water leaves
the wetland through an unrestricted culvert, over 50 percent of the wetland has
persistent, ungrazed vegetation, and over 50 percent of the wetland has seasonal
ponding. Wetland 118-1 receives stormwater from 118th Avenue SE located adjacent
and west of the wetland, providing moderate water quality support functions. Wetland
118-1 does not directly discharge into an aquatic resource on the 303(d) list but is
within the same sub-basin (Coal Creek), which is on the 303(d) list.
Hydrologic
Wetland 118-1 has moderate potential to reduce flooding and erosion due to the
wetland’s available storage capacity; marks of ponding (between 0.5 and 2 feet) were
observed. Other elements contributing to the wetland’s potential to support hydrologic
functions include stormwater runoff from the adjacent roadway (118th Avenue SE).
Newport shores is located along the lower part of Coal Creek and is known to have
flooding issues; therefore, this wetland has an opportunity to reduce flooding.
I-405 Wetland and Stream Assessment Report Page 57
WETLAND 118-1 – INFORMATION SUMMARY
Habitat
Wetland 118-1 has low potential to provide habitat for wildlife due to low species
diversity and low habitat interspersion. Special habitat features include standing snags
within the wetland. Surrounding land uses include highways, local roads, and
residential houses which limit accessible habitat and undisturbed habitat around the
wetland. No priority habitats are present in the wetland.
Buffer
Condition
The vegetated portion of buffer of Wetland 118-1 is located on eastside of the wetland
and is dominated by big leaf maple and Himalayan blackberry. The west side of the
wetland buffer is constrained due to 118th Avenue SE.
I-405 Wetland and Stream Assessment Report Page 58
Table 47. Wetland 118-2 Summary
WETLAND 118-2 – INFORMATION SUMMARY
Location: Latitude 47.572475, Longitude -122.181511
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 60 feet
Wetland Size 0.03 acres
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 118-2-W
Upland Data Sheet (s) SP 118-2-U
Flag color N/A
Dominant
Vegetation Wetland 118-2 is dominated by reed canarygrass and Himalayan blackberry.
Soils
Soils in Wetland 118-2 consist of 5 inches of very dark gray (10YR 3/1) sandy loam,
over 11 inches of dark gray (10YR 4/1) and very dark gray (10YR 3/1) sandy loam with
redoximorphic features. Based on the presence of hydrophytic vegetation and
hydrology as well as its landscape setting, hydric soils are assumed to be present.
Hydrology
The primary wetland hydrology indicator observed in Wetland 118-2 includes surface
saturation (A3). Wetland 118-2 receives groundwater discharge from seeps located in
the adjacent hillslope. Water collects and ponds in the ditch portion of Wetland 118-2
and then exits though a culvert.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 118-2 were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 118-2 is rated Category III using the Ecology rating system because it
provides moderate water quality (6) moderate hydrologic (7) functions and low habitat
(3) functions, scoring 16 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 118-2 has moderate potential to improve water quality as water exits the
wetland through an unrestricted culvert that is permanently flowing, over 95 percent of
persistent, ungrazed plants, and over 50 percent is seasonally ponded. Wetland 118-2
receives stormwater from 118th Avenue SE, located adjacent to the wetland, providing
moderate water qualit y support functions. Wetland 118-2 does not directly discharge
into Coal Creek, which is on the 303(d) list; however, the wetland is located within the
Coal Creek basin.
Hydrologic
Wetland 118-2 has minimal potential to reduce flooding and erosion due to the
presence of a permanently flowing culvert located in the wetland. Marks of ponding
were observed, indicating some storage capacity. The 118th Avenue SE roadway is
located adjacent to the wetland and provides moderate hydrologic support functions.
Newport shores, located along the lower part of Coal Creek, are known to have
flooding issues; therefore, this wetland has an opportunity to reduce flooding.
I-405 Wetland and Stream Assessment Report Page 59
WETLAND 118-2 – INFORMATION SUMMARY
Habitat
Wetland 118-2 has low potential to provide habitat for wildlife due to a single plant
class structure, low habitat interspersion and plant species richness. No special habitat
features were observed in the wetland. Surrounding land uses including highways,
local roads, and residential houses which limit accessible habitat and undisturbed
habitat around the wetland.
Buffer
Condition
The vegetated portion of the wetland buffer is dominated by Himalayan blackberry and
reed canary grass. The west side of Wetland 118-2 buffer is constrained due to 118th
Avenue SE.
I-405 Wetland and Stream Assessment Report Page 60
Table 48. Wetland 118-3 Summary
WETLAND 118-3 – INFORMATION SUMMARY
Location: Latitude 47.569805, Longitude -122.180817
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width NA
Wetland Size 0.05 acre
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 118-3-W
Upland Data Sheet (s) SP 118-3-U
Flag color N/A
Dominant
Vegetation Wetland 118-3 is dominated by reed canary grass and Himalayan blackberry.
Soils Soils in Wetland 118-3 consists of 16 inches of black (10YR 2/1) silt loam. Wetland
118-3 meets hydric soil indicators for a Hydrogen Sulfide Odor (A4).
Hydrology
Primary wetland hydrology indicators observed in the sample plot include saturation
(A4) at 5 inches. Wetland 118-3 receives groundwater discharge from seeps located in
the adjacent hillslope. Water collects and ponds in the ditch portion of Wetland 118-3
and then exits though a culvert.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 118-3 were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 118-3 is rated Category IV using the Ecology rating system because
it provides moderate water quality (6), moderate hydrologic (7) functions and low
habitat (3) functions, scoring 16 points on the rating form
Wetland Functions Summary
Water Quality
Wetland 118-3 has moderate potential to improve water quality functions because
water exits the wetland through an unrestricted culvert, over 50 percent of the area has
persistent, ungrazed vegetation and over a quarter of the area is seasonally ponded. A
roadway (118th Avenue SE) located adjacent to the wetland discharges stormwater
runoff into the wetland, providing moderate potential to support water quality functions.
Wetland 118-3 does not directly discharge into Coal Creek, which is on the 303(d) list;
however, the wetland is located within the Coal Creek basin.
Hydrologic
Wetland 118-3 has moderate potential to reduce flooding and erosion due to the
presence of an unrestricted, permanently flowing culvert. The wetland provides
moderate hydrologic functions because 118th Avenue SE discharges stormwater
runoff into Wetland 118-3. Newport shores located along the lower part of Coal Creek
are known to have flooding issues; therefore, this wetland has an opportunity to reduce
flooding in the sub-basin.
I-405 Wetland and Stream Assessment Report Page 61
WETLAND 118-3 – INFORMATION SUMMARY
Habitat
Wetland 118-3 has low potential to provide habitat for wildlife due to a single Cowardin
plant class present, low species diversity and no habitat interspersion. No special
habitat features were observed in the wetland. Surrounding land uses include
highways, local roads, and residential houses which limit accessible habitat and
undisturbed habitat around the wetland.
Buffer
Condition
The City of Bellevue does not require buffers for Category IV wetlands that are less
than 2,500 square feet. Wetland 118-3 is approximately 2,043 square feet.
I-405 Wetland and Stream Assessment Report Page 62
Table 49. Wetland 118-4 Summary
WETLAND 118-4 – INFORMATION SUMMARY
Location: Latitude: 47.581154, Longitude -122.178238
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 60 feet
Wetland Size 0.34 acre
Cowardin
Classification PFO/PSS
HGM Classification Depressional
Wetland Data Sheet(s) SP 118-4-W
Upland Data Sheet (s) SP 118-4-U
Flag color N/A
Dominant
Vegetation
Wetland 118-4L is dominated by black cottonwood, red osier dogwood, salmonberry,
horse tail with a small amount of Himalayan blackberry.
Soils
Soils in Wetland 118-4 consists of 8 inches of dark gray (10YR 4/2) sandy loam, 10
inches of greenish gray (Gley1 5/5GY) sandy loam. Wetland 118-4 meets hydric soil
indicators for a Loamy Gleyed Matrix (F2).
Hydrology Soils were saturated at the surface, and water table was present at 3 inches in the soil
pit. High groundwater is the primary source of wetland hydrology.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 118-4 were delineated
with a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 118-4 is rated Category III using the Ecology rating system because it
provides moderate water quality (7), hydrologic (6) functions and low habitat (4)
functions, scoring 17 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 118-4 has moderate potential to improve water quality as it has a highly
constricted permanently flowing outlet located on the southwest portion of the wetland.
Over 50 percent of persistent, ungrazed plants, and over 50 percent of seasonal
ponding area are present. Stormwater inputs from the adjacent highway and parking
lot provide moderate potential to support the water quality functions of the wetland.
Wetland 118-4 drains into a Mercer Slough wetland on the west side of the 118th
Avenue. Mercer Slough is on the 303(d) list.
Hydrologic
Wetland 118-4 has moderate potential to reduce flooding and erosion due to the
presence of a highly constricted permanently flowing outlet (culvert) located at the
southwest end of the wetland. The adjacent highway and parking lot provide moderate
potential to support hydrologic functions in the wetland.
Habitat
Wetland 118-4 has moderate potential to provide habitat for wildlife due to presence of
multiple pland structures and hydroperiods. Special habitat features observed in the
wetland include large downed woody debris and standing snags. Surrounding land
uses including highways, local roads, and commercial buildings limit accessible habitat
and undisturbed habitat around the wetland.
Buffer
Condition
Wetland 118-4 is bounded by the I-405 to the south, 118th Avenue SE to the west, and
a parking lot to the north. As a result, the vegetated buffers are generally limited to the
east of the wetland. The vegetated portion of the wetland buffer is dominated by big
leaf maple, black cottonwood, beaked hazelnult, Himalayan blackberry, lady fern,
sword fern, and English ivy.
I-405 Wetland and Stream Assessment Report Page 63
Table 50. Wetland 12.45M Summary
WETLAND 12.45M – INFORMATION SUMMARY
Location: Latitude47.598867, Longitude -122.181051
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 60 feet
Wetland Size 1.7 acres
Cowardin
Classification PFO/PSS
HGM Classification Slope
Wetland Data Sheet(s) SP 12.45L-W
Upland Data Sheet (s) SP 12.45L-U
Flag color N/A
Dominant
Vegetation
Wetland 12.45L is dominated by a forested vegetation community that consists of red
alder and black cottonwood with an understory of reed canarygrass, lady fern, and
giant horsetail. Salmonberry, red-osier dogwood, vine maple, Pacific willow, Scouler’s
willow, and skunk cabbage are also present in the wetland. Some Himalayan
blackberry is also present along the wetland edge.
Soils
Soils in Wetland 12.45L consist of 8 inches of dark grayish brown (10YR 4/2) sandy
loam and 10 inches of dark gray (10YR 4/1) sandy loam with redoximorphic features.
Soils in Wetland 7.42R meet hydric soil indicators for a Depleted Matrix (F3).
Hydrology
Soil saturation was present at 8 inches below the soil surface. Groundwater discharge
from hillside seeps is likely the primary source of wetland hydrology. Hixon Creek runs
through Wetland 12.45L.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 12.45LL were verified
with a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 12.45L is rated Category III using the Ecology rating system because
it provides moderate water quality (5) functions, hydrologic (6) functions, and habitat
(5) functions, scoring 16 points on the rating form
Wetland Functions Summary
Water Quality
Wetland 12.45L has moderate potential to improve water quality due to the presence
of over 50 percent of dense, woody plants. Roadways located uphill of the wetland
provide moderate potential to support the water quality functions. Wetland 12.45L is
located in the Mercer Slough basin, and Mercer Slough is on the 303(d) list.
Hydrologic
Wetland 12.45L has moderate potential to reduce flooding and erosion due to the
presence of dense, uncut, rigid plants. Hydrologic functions of the wetland are
supported by the highway located upslope of the wetland. Areas along the lower part
of Mercer Slough are known to have flooding issues; therefore, this wetland has an
opportunity to reduce flooding.
I-405 Wetland and Stream Assessment Report Page 64
WETLAND 12.45M – INFORMATION SUMMARY
Habitat
Wetland 12.45L has moderate potential to provide habitat for wildlife as it has multiple
Cowardin classes and hydroperiods. Special habitat features including large downed
woody debris, standing snags, overhanging vegetation over the seasonal drainage
channel were observed in the wetland. Wetland 12.45L has limited accessible habitat
as it is surrounded by highways. Wetland 12.45L provides a moderate value for wildlife
as it is located in close proximity to Hixon Creek.
Buffer
Condition
Western portions of the Wetland 12.45L buffers are less than 60 feet wide as the
wetland is bounded by south bound of I-405 to the west. The vegetated portion of the
buffer on east side of the wetland is primarily dominated by Himalayan blackberry.
Some Douglas fir trees are also present southeast end of the wetland.
I-405 Wetland and Stream Assessment Report Page 65
Table 51. Wetland 12.82R Summary
WETLAND 12.82R – INFORMATION SUMMARY
Location: Latitude 47.572475, Longitude -122.181511
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40 feet
Wetland Size 0.061 acres
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 12.82R-W
Upland Data Sheet (s) SP 12.82R -U
Flag color N/A
Dominant
Vegetation Wetland 12.82R is dominated by reed canarygrass and cattails.
Soils
Soils in Wetland 12.82R consist of 5 inches of very dark gray (10YR 3/1) sandy loam,
over 11 inches of dark gray (10YR 4/1) and very dark gray (10YR 3/1) sandy loam with
redoximorphic features. Based on the presence of hydrophytic vegetation and
hydrology as well as its landscape setting, hydric soils are assumed to be present.
Hydrology
The primary wetland hydrology indicator observed in Wetland 12.82R includes surface
saturation (A3). Wetland 12.82R receives groundwater discharge from seeps located
in the adjacent hillslope. Water collects and ponds in the ditch portion of Wetland
12.82R and then exits though a catch basin.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 12.82R were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 12.82R is rated Category IV using the Ecology rating system because
it provides moderate water quality (6) moderate hydrologic (7) functions and low
habitat (3) functions, scoring 16 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 12.82R has moderate potential to improve water quality as it is contained in a
ditch next to a local street, and can collect stormwater pollutants which supports the
water quality functions of the wetland. The wetland does not directly discharge into a
stream but it is in the Kelsey Creek basin.
Hydrologic Wetland 12.82R has minimal potential to reduce flooding and but does otherwise slow
runoff from entering Kelsey Creek.
Habitat
Wetland 12.82R has low potential to provide habitat for wildlife due to a single plant
class structure, low habitat interspersion and plant species richness. No special habitat
features were observed in the wetland. Surrounding land uses including highways,
local roads, and commercial development.
Buffer
Condition
The vegetated portion of the wetland buffer is dominated by Himalayan blackberry and
reed canary grass. The south side of Wetland 12.82R buffer is constrained due to to
8th Avenue SE.
I-405 Wetland and Stream Assessment Report Page 66
Table 52. Wetland 13.0R Summary
WETLAND 13.0R – INFORMATION SUMMARY
Location: Latitude 47.568527, Longitude -122.18073
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) IV
Local Jurisdiction
Rating IV
Local Jurisdiction
Buffer Width 40
Wetland Size 0.213
Cowardin
Classification PEM
HGM Classification Depressional
Wetland Data Sheet(s) SP 13.0R-W
Upland Data Sheet (s) SP 13.0R -U
Flag color N/A
Dominant
Vegetation Wetland 13.0R is dominated by reed canarygrass.
Soils
Soils in Wetland 13.0R consist of 7 inches of black (2.5Y 2.5/1) silt loam, 2 inches of
dark gray (Gley1 4/N) silty clay loam, and 9 inches of dark greenish gray (Gley1 4/10Y)
sand. Sulfidic odor was present at 7 inches below the soil surface. Wetland 13.0R
meets hydric soil indicators for a Hydrogen Sulfide (A4) and a Loamy Gleyed Matrix
(F2).
Hydrology Soils were saturated to the surface, and water table was present at the surface.
Primary hydrology source is groundwater and roadway runoff.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 13.0R were verified with
a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 13.0R is rated Category IV using the Ecology rating system because
it provides moderate water quality (7) and hydrologic (7) functions and low habitat (4)
functions, totaling 18 points on the rating form.
Wetland Functions Summary
Water Quality
Wetland 13.0R has moderate moderate potential to improve water quality as it is
contained in a ditch next to I-405, and can collect stormwater pollutants which supports
the water quality functions of the wetland. The wetland does not directly discharge to
Sturtevant Creek but is within the same basin.
Hydrologic Wetland 13.0R has little to no opportunity to reduce flooding.
Habitat
The wetland has low potential to provide habitat for wildlife due to low species diversity
and no habitat interspersion or connection to other habitats. No special habitat features
were observed in the wetland. Surrounding land uses including highways, local roads,
and commercial development.
Buffer
Condition
The buffer is limited by I-405, and is dominated by Himalayan blackberry to the east
and roadside grasses.
I-405 Wetland and Stream Assessment Report Page 67
Table 53. Wetland 13.25R Summary
WETLAND 13.25R – INFORMATION SUMMARY
Location: Latitude 47.566091, Longitude -122.182021
Local Jurisdiction Bellevue
WRIA 8
Ecology Rating
(Hruby, 2014) III
Local Jurisdiction
Rating III
Local Jurisdiction
Buffer Width 110 feet
Wetland Size 0.191 acres
Cowardin
Classification PSS
HGM Classification Depressional
Wetland Data Sheet(s) SP 13.25R-W
Upland Data Sheet (s) SP 13.25R-U
Flag color N/A
Dominant
Vegetation
This is dominated by twinberry (Lonicera involucrata), and reed canarygrass. English
holly is also present in the wetland.
Soils
Soils in Wetland 13.25R consists of 6 inches of very dark gray (10YR 3/1) sandy loam,
4 inches of dark gray (Gley1 4/10Y) sandy loam with redoximorphic features, and 8
inches of brown (10YR 4/3) sandy loam with redoximorphic features. Wetland 13.251R
meets hydric soil indicators for a Loamy Gleyed Matrix (F2).
Hydrology
Sols were saturated at 16 inches below the surface. Signs of surface water ponding
such as water marks (B1) and water stained leaves (B9) were observed. The primary
sources of hydrology for this wetland include a high water table and runoff from I-405.
Rationale for
Delineation
All three wetland criteria are met. The boundaries of Wetland 13.251R were verified
with a GPS device where indicators of wetland vegetation, hydric soil and wetland
hydrology were present.
Rationale for
Local Rating
The City of Bellevue classifies wetlands according to the current Ecology rating
system. Wetland 13.25R is rated Category III using the Ecology rating system because
it provides moderate water quality (6) and hydrologic (6) functions and low habitat (5)
functions, scoring 17 points on the rating form
Wetland Functions Summary
Water Quality
Wetland 13.25R has moderate potential to improve water quality as it is contained in a
ditch next to I-405, and can collect stormwater pollutants which supports the water
quality functions of the wetland. Wetland 13.251R does not directly discharge into a
stream but it is in the Sturtevant Creek basin.
Hydrologic Wetland 13.25R has little to no opportunity to reduce flooding.
Habitat
The wetland has low potential to provide habitat for wildlife due to low species diversity
and no habitat interspersion or connection to other habitats. No special habitat features
were observed in the wetland. Surrounding land uses including highways, local roads,
and commercial development.
Buffer
Condition
The buffer is limited by I-405, but some landscape plantings were observed to the east,
including redosier dogwood and arborvitae.
I-405 Wetland and Stream Assessment Report Page 68
Streams
There are 24 streams that cross I-405 within the study area, ranging from small, ephemeral, non-
fish bearing watercourses, to larger creeks with direct connections to Lake Washington and
documented presence of salmonids.
Table 54. Stream Summary
Stream
WDNR
Stream
Type
Stream Buffer
Width Jurisdiction
John's Creek F 115 Renton
May Creek F 115 Renton
Clover Creek F 115 Renton
UNT.08.LW.0283 F 115 Renton
Stream 7.7A F 115 Renton
Stream 7.8 F 115 Renton
Stream 8.08 Ns 50 Renton
Stream 8.12 Ns 50 Renton
Stream 8.15 Ns 50 Renton
Stream 8.22 Ns 50 King Co.
Stream 8.35 Ns 50 King Co.
Stream 8.55 Ns 50 Bellevue
Stream 8.7 Ns 50 Bellevue
Stream 8.9 Ns 50 Bellevue
Lakehurst Creek F 100 Bellevue
Stream 9.8 Ns 50 Bellevue
Stream 9.9 Ns 50 Bellevue
Stream 10.0 Ns 50 Bellevue
Coal Creek F 100 Bellevue
Richards Creek F 100 Bellevue
Trail Creek F 50 Bellevue
Median Creek F 100 Bellevue
Kelsey Creek F 200 Bellevue
Sturtevant Creek F 100 Bellevue
Many of the streams in the study area are contained in pipes and include little to no open
channel on WSDOT ROW, making it unlikely they could be significantly (or at all) impacted by
highway improvements. This is typical of the non-fish bearing streams, as well as Clover Creek
Lakehurst Creek, Richards Creek and Trail Creek. Kelsey Creek, a large stream in Bellevue that
is connected to Mercer Slough by a fish ladder, is confined to a culvert spanning the ROW over
600 feet.
The remaining streams have daylighted sections closer to expected highway improvements.
Details of these streams are provided in tables 46 – 53.
I-405 Wetland and Stream Assessment Report Page 69
Table 55. Johns Creek Summary
Johns Creek – Information Summary
Stream Name Johns Creek
DNR Stream Type Type F
Jurisdiction for portion of stream in
study area
City of Renton Buffer 115 ft
Location of
Stream Relative
to Project
Johns Creek crosses I-405 near milepost 5.0.
Connectivity
(where stream
flows from/to)
Johns Creek originates east of I-405 in Renton near Sunset Blvd NE. The
creek flows west toward I-405 where it enters a culvert. The creek
remains in pipes underneath The Landing, a mixed
commercial/residential development, for over 2,000 feet before
daylighting near the entrance to Gene Coulon Memorial Beach Park, and
draining to Lake Washington.
Fish Presence Anadromous fish and federally listed species are potentially present
between Lake Washington and the BNSF crossing near Lake
Washington BLVD. Resident fish including cutthroat trout, western brook
lamprey, sculpin, and threespine stickleback, among others, may be
present throughout.
Habitat Habitat for rearing juvenile salmonids may be present in the lower
reaches of Johns Creek. The velocity of the stream is highly affected by
the backwater effect of Lake Washington which may make the area
suitable to juvenile fish. There is limited habitat upstream of I-405 due to
lack of channel complexity and insufficient flow depth.
Riparian/Buffer
Condition
Buffers downstream of I-405 are heavily developed but include narrow
bands of willows and conifers within Gene Coulon Park, and Himalayan
blackberries outside the park. Upstream of I-405, the buffer includes
mixed forest with a blackberry and sword fern understory,
I-405 Wetland and Stream Assessment Report Page 70
Table 56. May Creek Summary
May Creek – Information Summary
Stream Name May Creek
DNR Stream
Type Type F
Jurisdiction for portion of stream in study area
City of Renton
Buffer 200 ft (Shoreline Jurisdiction)
Location of
Stream Relative
to Project
May Creek flows through the project area under a bridge just south of the
NE 44th Street Interchange. The project includes the replacement of the
May Creek Bridge.
Connectivity
(where stream
flows from/to)
May Creek originates well east of I-405 and flows generally east to west
toward Lake Washington. The creek crosses I-405 under a bridge near
milepost 7.1. From I-405, the creek continues west through a city of
Renton park and under Lake Washington Blvd toward a lake front
housing development.
Fish Presence Anadromous fish and federally listed species including coho, chinook,
and steelhead are presumed or known to be present in May Creek,
although with the exception of coho, the numbers are expected to be low.
Resident fish including cutthroat trout are likely present throughout the
lower reaches of May Creek. Other resident fish may include cutthroat
trout, western brook lamprey, sculpin, and threespine stickleback.
Habitat Habitat in May Creek is limited due to extensive development in the lower
reaches. The reach directly under I-405 is highly constricted by heavy rip
rap placed to protect bridge piers. This creates high velocities not
suitable for juvenile fish during higher flows, and there is a lack of LWD in
the system here because tree growth is inhibited by the presence of the
bridge.
Riparian/Buffer
Condition
The buffer of May Creek is generally high quality compared to other
streams in the area. With the exception of the area adjacent the I-405
Bridge, large stands of deciduous forest including cottonwood and bigleaf
maple, with a shrub understory, throughout, although there are
occasionally large stands of invasive species including Himalayan
blackberry and a Japanese knotweed.
I-405 Wetland and Stream Assessment Report Page 71
Table 57. UNT.08.LW.0283 Summary
Gypsy Creek Sub-Basin Drainage (UNT.08.LW.0283) – Information Summary
Stream Name Gypsy Creek Sub-Basin Drainage (UNT.08.LW.0283)
DNR Stream
Type Type F
Jurisdiction for portion of stream in study area
City of Renton
Buffer 50 ft
Location of
Stream Relative
to Project
UNT.08.LW.0283 flows through the project area under along the
northbound off-ramp near NE 44th Street in Renton. The stream flows
under NE 44th Street and along Lake Washington Blvd NE before
crossing I-405 near a Denny’s restaurant. The project includes the
replacement of the crossings under NE 44th Street and I-405.
Connectivity
(where stream
flows from/to)
UNT.08.LW.0283 originates near the SE 80th Street and 116th Ave SE in
the city of Newcastle and flows east to west toward Lake Washington.
The creek crosses I-405 just north of the NE 44th Street interchange and
flows west into an underground vault and a ~900 foot pipe to its outlet in
Lake Washington.
Fish Presence Anadromous fish and federally listed species are not known or expected
to be present in UNT.08.LW.0283. Resident fish may include cutthroat
trout, western brook lamprey, sculpin, and threespine stickleback, among
others.
Habitat Habitat in UNT.08.LW.0283 is limited due to extensive development in
the lower reaches and significant sedimentation near I-405. Wetlands
upstream of I-405 provide some off-channel habitat and rearing
opportunities for juveniles. There is some LWD in the system but
opportunity is lacking upstream and the stream is confined to a roadside
ditch south of 43rd Place. The upper reaches of the stream include a
deeply incised channel, evidence of flashiness created by significant
runoff contributions to the stream. The channel here is also rather
narrow, and flows are swift and shallow. There are few if any riffle/pool
complex and little habitat diversity.
Riparian/Buffer
Condition
The buffer of UNT.08.LW.0283 is limited by the proximity of roads and
development. The lower reaches include riverine wetlands dominated by
reed canarygrass, redosier dogwood, and Pacific willow. The upper
reaches include bigleaf maple, black cottonwood, and an understory of
sword fern and Oregon grape as well as Himalayan blackberry in the
riparian zone.
I-405 Wetland and Stream Assessment Report Page 72
Table 58. Stream 7.7a Summary
Stream 7.7a – Information Summary
Stream Name Stream 7.7a
DNR Stream
Type Type F
Jurisdiction for portion of stream in study area
City of Renton
Buffer 50 ft
Location of
Stream Relative
to Project
Stream 7.7a crosses I-405 within a culvert near milepost 7.7, in Renton.
Connectivity
(where stream
flows from/to)
Stream 7.7a originates near Lake Washington Blvd in north Renton, east
of I-405. It flows west toward the freeway into a culvert and daylights
within the ROW on the west side. From there the stream crosses under
Seahawks Way onto BNSF ROW, and flows north to its confluence with
Stream 7.8. The combined stream passes through a flume on private
property before entering Lake Washington.
Fish Presence Anadromous fish and federally listed species are not known or expected
in this stream due to fish passage barriers. The stream narrowly meets
physical criteria to contain fish throughout most of its reach. Resident fish
may include cutthroat trout, western brook lamprey, sculpin, and
threespine stickleback, among others.
Habitat Habitat is very limited in this stream due to insufficient flow depth in the
upper reaches, and heavy development in the lower reaches.
Riparian/Buffer
Condition
Buffers are dominated by blackberries upstream of I-405, and wetland
vegetation on BNFS ROW downstream.
I-405 Wetland and Stream Assessment Report Page 73
Table 59. Stream 7.8 Summary
Stream 7.8 – Information Summary
Stream Name Stream 7.8
DNR Stream
Type Type F
Jurisdiction for portion of stream in study area
City of Renton
Buffer 50 ft
Location of
Stream Relative
to Project
Stream 7.8 crosses I-405 within a culvert near milepost 7.8 in Renton.
Connectivity
(where stream
flows from/to)
Stream 7.8 originates near Lake Washington Blvd in north Renton, east
of I-405. It flows west toward the freeway into a culvert that conveys the
stream under I-405 and Seahawks Way, before daylighting on BNSF
ROW. The stream combines with Stream 7.7a and then discharges to
Lake Washington through a flume on private property.
Fish Presence Anadromous fish and federally listed species are not known or expected
in this stream due to fish passage barriers. The stream narrowly meets
physical criteria to contain fish throughout most of its reach. Resident fish
may include cutthroat trout, western brook lamprey, sculpin, and
threespine stickleback, among others.
Habitat Habitat is very limited in this stream due to insufficient flow depth in the
upper reaches, and heavy development in the lower reaches. There is
very little channel complexity and the stream is not of sufficient size to
recruit large woody debris.
Riparian/Buffer
Condition
Buffers are dominated by blackberries upstream of I-405, and wetland
vegetation on BNSF ROW downstream.
I-405 Wetland and Stream Assessment Report Page 74
Table 60. Coal Creek Summary
Coal Creek – Information Summary
Stream Name Coal Creek
DNR Stream
Type Type F
Jurisdiction for portion of stream in study area
City of Bellevue 100 ft
Location of
Stream Relative
to Project
Coal Creek crosses I-405 approximately at milepost 10.12.
Connectivity
(where stream
flows from/to)
Coal Creek flows east to west from Cougar Mountain in east King
County. The creek crosses I-405 through a fish passable culvert with a
vertical weir at the upstream end. From there the creek meanders
through the Newport Shores neighborhood south Bellevue before
entering Lake Washington just south of I-90.
Fish Presence Anadromous fish, including federally listed species are potentially present
throughout, along with resident fish including cutthroat trout, western
brook lamprey, sculpin, and threespine stickleback, among others.
Habitat Habitat in the vicinity of the I-405 corridor is primarily foraging and
migration. Spawning of salmonids is known to occur upstream of I-405.
There is limited LWD and refugia in the lower creek, but that increases
once upstream of a series of log weirs east of I-405.
Riparian/Buffer
Condition
The riparian zone within the Newport Shores area is narrowed by the
presence of residences near the edge of the creek. Native deciduous
trees and English ivy are dominant in this section. Upstream of I-405, the
riparian zone widens out and includes more varied forest canopy and
shrub understory. This portion of the stream buffer is functioning well.
I-405 Wetland and Stream Assessment Report Page 75
Table 61. Median Creek Summary
Median Creek – Information Summary
Stream Name Median Creek
DNR Stream
Type Type F
Jurisdiction for portion of stream in study area
City of Bellevue 100 ft
Location of
Stream Relative
to Project
Median Creek crosses I-405 approximately at milepost 12.42.
Connectivity
(where stream
flows from/to)
The creek originates at a culvert outlet near northbound I-405 and flows
east to west through the freeway median, toward the Mercer Slough
Wetland complex. The creek crosses southbound I-405 through a culvert
then meanders through a mitigation site between the freeway and 118th
Ave SE. The creek then passes under 118th Street SE and into a forested
wetland.
Fish Presence Anadromous fish and federally listed species are not known or expected
in this stream due to fish passage barriers at 118th Street SE and I-405.
The stream narrowly meets physical criteria to contain fish. Resident fish
may include cutthroat trout, western brook lamprey, sculpin, and
threespine stickleback, among others.
Habitat There may be suitable habitat for resident fish within the I-405 median,
where the creek flows within a wetland.
Riparian/Buffer
Condition
The stream is relatively short, draining to a wetland within a few hundred
meters of its headwaters. Riparian conditions are somewhat disturbed
but the median is wide enough to allow for extensive canopy cover in the
upper reach. Downstream of I-405 the riparian area has been disturbed
by previous road projects but restored with native woody vegetation that
is still establishing.
I-405 Wetland and Stream Assessment Report Page 76
Table 62. Sturtevant Creek Summary
Sturtevant Creek – Information Summary
Stream Name Sturtevant Creek
DNR Stream
Type Type F
Jurisdiction for portion of stream in study area
City of Bellevue 100 ft
Location of
Stream Relative
to Project
Sturtevant Creek crosses I-405 approximately at milepost 13.04.
Connectivity
(where stream
flows from/to)
Sturtevant Creek originates in Lake Bellevue, and flows to the south in a
channelized stream section along BNSF ROW before entering a pipe
near the I-405/NE 8th Street Interchange. The creek continues south and
daylights in several isolated areas between commercial developments,
before crossing I-405, then flowing into Mercer Slough.
Fish Presence Anadromous fish and federally listed species are potentially present
between Mercer Slough and I-405. Resident fish including cutthroat trout,
western brook lamprey, sculpin, and threespine stickleback, among
others, may be present throughout.
Habitat Habitat in Sturtevant Creek varies, as the stream meanders through
heavily developed commercial areas, office parks, and large wetland
complexes. Juvenile rearing habitat is most prevalent. Spawning habitat
for salmonids is not likely present due to unsuitable streambed material.
Riparian/Buffer
Condition
Buffer conditions are varied, but generally include connected wetlands
where native willows dominate. A long reach of the creek just
downstream of I-405 includes a maintained grassy lawn with an overstory
of bigleaf maple.
Sensitive Plants, Fish, and Wildlife
There are no sensitive plants documented within the study area, however there is extensive use
of the area by migratory birds, most notably, the bald eagle.
A review of Priority Habitat Species data indicates that there may be over 30 bald eagle nests
surrounding Lake Washington, including many on Mercer Island. There is one nest site located
within 300 feet of the corridor. The site sits between the freeway and Lake Washington and has
line-of-site to the southbound lanes. Breeding activities could be disrupted during roadway
construction projects, although this is unlikely due to the high level of baseline disturbance around
Lake Washington and the extensive presence of eagles in the area. The Seattle Audubon Society
recorded the presence of 72 individual bald eagles on Lake Washington on December 31, 2016.
With the quantity of birds and nest sites surrounding the Lake, which includes I-405 to the east,
I-405 Wetland and Stream Assessment Report Page 77
and I-90 and SR 520 on floating bridges, it is likely they have adapted to a high level of baseline
disturbance, allowing them to continue to utilize pockets of habitat throughout the lake.
A separate Biological Assessment has been prepared for each of two funded project within the
study area which address ESA-listed species within the corridor. Many streams in the corridor
can support resident fish, and ESA-listed salmonids can occur in the Cedar River, May Creek,
Coal Creek, and Sturtevant Creek. Also, parts of the Mercer Slough have suitable habitat for the
yellow-billed cuckoo.
I-405 Wetland and Stream Assessment Report Page 78
REFERENCES
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and
deepwater habitats of the United States. Government Printing Office, Washington, D.C.
Environmental Laboratory. 1987. Corps of Engineers wetland delineation manual. Technical
Report Y-87-1, Environmental Laboratory, Department of the Army, Waterways
Experiment Station, Vicksburg, MI. Available from:
http://el.erdc.usace.army.mil/wetlands/pdfs/wlman87.pdf
Hruby, Thomas. 2014. Washington State wetland rating system for western Washington -
Revised. Washington State Department of Ecology Publication #04-06-025. Olympia,
Washington. Available online at: http://www.ecy.wa.gov/biblio/0406025.html
Renton. 2014. Renton Municipal Code: Title IV. Section 4-3-050 Critical Areas Regulations.
Available from: http://www.codepublishing.com/wa/renton/
Reed, P.B. Jr. 1988. National list of plant species that occur in wetlands: Washington.
Biological Report 88(26.9) for National Wetlands Inventory, Washington, D.C.
Reed, P.B. Jr. 1993. Northwest supplement (Region 9) species with a change in indicator
status or added to the Northwest 1988 list, wetland plants of the state of Washington
1988. Biological Report 88 (26.9) for National Wetlands Inventory, Washington, D.C.
USACE (U.S. Army Corps of Engineers). 2010. Regional Supplement to the Corps of Engineers
Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region (Version
2.0), ed. J.S. Wakely, R.W. Lichvar, and C.V. Noble. ERDC/EL TR-10-3. Vicksburg,
Mississippi. Available at: http://el.erdc.usace.army.mil/elpubs/pdf/trel10-3.pdf
USDA, NRCS. 2012a. U.S. Department of Agriculture. Natural Resources Conservation
Service. National List of Hydric Soils: King County (WA). Available from:
http://soils.usda.gov/use/hydric/
USDA, NRCS. 2012b. U.S. Department of Agriculture, Natural Resources Conservation
Service. Web Soil Survey. Accessed July 17, 2013 at:
http://websoilsurvey.nrcs.usda.gov/app/.
WDFW. 2012a. Washington State Department of Fish and Wildlife. Priority habitats and
species (habitat points) database. Data updated March 21, 2014.
WDFW. 2012b. Washington Department of Fish and Wildlife. Priority Habitats and Species
(polygon data) database. Data updated March 21, 2014.
WDNR. 2012b. Washington Department of Natural Resources. List of vascular plants tracked
by Washington Natural Heritage Program. Updated June 2012. Available online at:
http://www1.dnr.wa.gov/nhp/refdesk/lists/plantrnk_family.html.
WSDOT. 2007. Wetland Biology Report, Tukwila to Renton Improvement Project. Washington
State Department of Transportation, June 206.
I-405 Wetland and Stream Assessment Report Page C-1
APPENDIX A – EXISTING CONDITIONS PLAN SHEETS
H
orizo
n
ta
l
Alig
n
m
ent
X
L
4
6
5
3
_
M
ainlin
e
S
B
4
0
5
A
L
_
H
W
_
C
Li
n
e
P
S
E
N
e
w
EQUATION
EQUATION
Horizo
ntal Align
ment
XL4653_Mainline
NB405
AL_
H
W
_CLinePS
E
New
MP
3.90
M
P 3.9
5
M
P 4.00
M
P 4.05
MP
4.10
M
P 4.15
M
P 4.2
0
MP 4.25
MP 4.30 MP 4.35 MP 4.40
MP 4.45
MP 4.50
MP 4.55 MP 4.60
MP 4.65
MP 4.70
MP 4.75
MP 4.80
MP 4.85
MP 4.90
MP 4.95
MP 5.00
MP 5.05
MP 5.10
MP 5.15
MP 5.20
MP 5.25
MP 5.30
MP 5.35
MP 5.40
MP 5.45
MP 5.50
MP 5.55
MP 5.60
MP 5.65
MP 5.70
MP 5.75
MP 5.80
MP 5.85 MP 5.90
MP 5.95 MP 6.00
MP 6.05 MP 6.10
MP 6.15 MP 6.20 MP 6.25 MP 6.30 MP 6.35
MP 6.40 MP 6.45 MP 6.50 MP 6.55 MP 6.60 MP 6.65 MP 6.70 MP 6.75 MP 6.80 MP 6.85 MP 6.90 MP 6.95 MP 7.00 MP 7.05 MP 7.10 MP 7.15 MP 7.20
MP 7.25 MP 7.30 MP 7.35 MP 7.40
MP 7.45
MP 7.50
MP 7.55
MP 7.60
MP 7.65
MP 7.70
MP 7.75 MP 7.80 MP 7.85
MP 7.90
MP 7.95
MP 8.00
MP 8.05
MP 8.10
MP 8.15 MP 8.20 MP 8.25 MP 8.30 MP 8.35 MP 8.40 MP 8.45 MP 8.50 MP 8.55 MP 8.60 MP 8.65 MP 8.70
MP 8.75
M
P 8.80
M
P 8.85
MP 8.90
MP
8.95
MP
9.00
MP
9.05
MP
9.10
MP 9.15
MP 9.20
MP 9.25
MP 9.30
MP 9.35
MP 9.40
MP 9.45
MP 9.50
MP 9.55 MP 9.60 MP 9.65 MP 9.70
MP 9.75
MP
9.80
MP 9.85
MP 9.90
MP 9.95
MP 10.00
MP 10.05
MP 10.10
MP 10.15
M
P
10.20
MP 10.25
MP 10.30
MP 10.35
MP 10.40
MP 10.45
MP 10.50
MP 10.55
MP 10.60
MP 10.65
MP 10.70
MP 10.75
MP 10.80 MP 10.85 MP 10.90 MP 10.95 MP 11.00
MP 11.05
MP 11.10
MP 11.15
MP 11.20
MP 11.25
MP 11.30
MP 11.35
MP 11.40
MP 11.45
MP 11.50
MP 11.55
MP 11.60
MP 11.65
MP 11.70
NE 30TH ST.
NE 30TH ST.
N 32ND ST.
SE 76TH ST.
190TH AVE
160TH AVE SE
PARK & RIDE
106TH AVE
45TH
PL
SE
C
O
A
L
C
R
E
E
K
P
K
W
A
Y
S
E
190TH AVE
SE 35TH ST
PARK & RIDE LAKE WASHINGTON BLVD SE
STREAM 7.7
STREAM 7 .75
STREAM 7.8 5
STREAM 8.15
STRE
A
M 8.4
NE 43RD ST
NE 44TH ST
NE 44T
H S
T
LAKE WASHINGTON BLVD N
SEAHAWKS WAY
LAKE WASHINGTON BLVD NE
RIPLEY LN N
EASTSIDE RAIL CORRIDOR
109TH AVE SE
SE 61ST ST
119TH AVE SE
120TH AVE SE
106TH AVE SE
EASTSIDE RAIL CORRIDOR
EASTSIDE RAIL CORRIDOR
EASTSIDE RAIL CORRIDOR
EASTSIDE RAIL CORRIDOR
WASHINGTON BLVD SE
LAKE
EASTSIDE RAIL CORRIDOR
EASTSIDE RAIL CORRIDOR
EASTSIDE RAIL CORRIDOR
EASTSIDE RAIL CORRIDORLAKE WASHINGTON BLVD SE
113TH AVE SE
112TH AVE SE
160TH AVE SE
EASTSIDE RAIL CORRIDOR
EASTSIDE RAIL CORRIDOR
XL4653
CORRIDOR WIDENING & EXPRESS TOLL LANES
I-405
RENTON TO BELLEVUE
S. TAYLOR
1250 2500
SCALE IN FEET
0
RENTON BELLEVUENEWCASTLE
Lorena Eng
EXISTING CONDITIONS EXHIBIT KEYMAP
DRAFT
SHEET 1
SHEET 2
SHEET 3
SHEET 4
SHEET 5
SHEET 6
SHEET 7
SHEET 8
SHEET 9
SHEET 10
SHEET 11
SHEET 12
SHEET 13
SHEET 14
SHEET 15
SHEET 16
SHEET 17
SHEET 18
SHEET 19
SHEET 20
SHEET 21
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE 9/19/2017
c:\users\taylorsu\pw_wsdot\d0138217\XL4653_EB_ExWetland_KeyMap.dgn
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH10
PLOTTED BY
DATE
.
.
.
.
.
.
.
taylorsu
5:20:48 PM
Washington State
Department of Transportation
WL 10.01R
WL 10.0L
WL 10.16L
WL 10.05R
WL 9.68L
WL 9.3R
WL 9.32R
WL 8.6R
WL 8.5L
WL 8.44L
WL 9.2R
WL 8.05R
WL 7.84R
WL 7.83R
WL 10.9L
WL 7.8L
WL 7.79L
WL 7.78L
WL 7.82R
WL 7.42R
WL 7.66R
WL 7.44L
WL 7.35R
WL 5.39L
WL 5.38L
WL 5.4L
WL 5.37L
WL 5.36L
WL 10.25L-B
WL 10.25L-A
WL 9.82L
WL 8.4L
WL 7.5L
WL 5.1R
WL 5.0R
WL 4.9R
WL 4.53R
WL 4.1R-NJ
WL 7.2R
WL 7.3R
WL 10.8L
WL 10.8L
WL 4.95L
WL 8.2R
WL 9.83L
WL 9.5L
WL 8.8LWL 8.75L
WL 8.2L
D-8.2L
D-9.0L
D-8.9L
D-10.3L-A
D-10.3L-A
STREAM 8.55
STREAM 8.31
STREAM 8.55
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE $$$$DATE$$$
$$$$$$$$DESIGNFILENAME$$$$$$
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH10
PLOTTED BY
DATE
.
.
.
.
.
.
.
$$USERNAME$$
$TIME$
SCALE IN FEET
0 50 100
INTERSTATE
405 Project Team
Washington State
Department of Transportation
MP 3.95 MP 4.00 MP 4.05 MP 4.10 MP 4.15 MP 4.20
T
PB
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
1
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
SB I-405
NB I-405
WETLAND 4.1R-NJ
S
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1
6
9
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W
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B
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HOUSER WAY
N
. 3
R
D
S
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MONTEREY DR.
169-SB405 LINE
169-NB405 LINE
S. TAYLOR
EXISTING CONDITIONS EXHIBIT
Lorena Eng
R. THOMAS
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE $$$$DATE$$$
$$$$$$$$DESIGNFILENAME$$$$$$
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH10
PLOTTED BY
DATE
.
.
.
.
.
.
.
$$USERNAME$$
$TIME$
SCALE IN FEET
0 50 100
INTERSTATE
405 Project Team
Washington State
Department of Transportation
M
P
4.
4
5
M
P
4.
5
0
MP
4
.55
MP 4.60
MP 4.65
MP 4.70
MP 4.75
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
2
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
SB I-405
NB I-405
SUNSET-NB405 LINE
SB405-SUNSET LINE
SUNSET BLVD NE
HOUSER WAY
SUNSET BLVD NE
WETLAND 4.53R
S. TAYLOR
Lorena Eng
G
R
A
N
D
E
Y
W
A
Y
N
E
EXISTING CONDITIONS EXHIBIT
R. THOMAS
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE $$$$DATE$$$
$$$$$$$$DESIGNFILENAME$$$$$$
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH10
PLOTTED BY
DATE
.
.
.
.
.
.
.
$$USERNAME$$
$TIME$
SCALE IN FEET
0 50 100
INTERSTATE
405 Project Team
Washington State
Department of Transportation
MP 4.90 MP 4.95 MP 5.00 MP 5.05 MP 5.10
MP 5.15
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
3
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
WETLAND 4.95L
WETLAND 4.9R
WETLAND 5.0R
WETLAND 5.36L
WETLAND 5.37L
WETLAND 5.1R
SB I-405 ON RAMP
SB I-405
NB I-405
HOUSER WAY
S. TAYLOR
N
8
T
H
S
T
Lorena Eng
JOHNS CREEK
EXISTING CONDITIONS EXHIBIT
R. THOMAS
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE $$$$DATE$$$
$$$$$$$$DESIGNFILENAME$$$$$$
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH10
PLOTTED BY
DATE
.
.
.
.
.
.
.
$$USERNAME$$
$TIME$
SCALE IN FEET
0 50 100
INTERSTATE
405 Project Team
Washington State
Department of Transportation
MP 5.30
MP 5.35
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
4
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
WETLAND 5.39L
WETLAND 5.38L
WETLAND 5.4L
SB I-405 ON RAMP
SB I-405
NB I-405
S
B
I
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4
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N
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R
I
D
O
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S. TAYLOR
Lorena Eng
JOHNS CREEK
EXISTING CONDITIONS EXHIBIT
R. THOMAS
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE $$$$DATE$$$
$$$$$$$$DESIGNFILENAME$$$$$$
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH10
PLOTTED BY
DATE
.
.
.
.
.
.
.
$$USERNAME$$
$TIME$
SCALE IN FEET
0 50 100
INTERSTATE
405 Project Team
Washington State
Department of Transportation
MP 6.10 MP 6.15 MP 6.20 MP 6.25 MP 6.30 MP 6.35
T
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
21
5S. TAYLOR
Lorena Eng
HIGH AVE NE
SB I-405
NB I-405
N
2
4
T
H
S
T
.
N
2
6
T
H
S
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MEADOW AVE N.
N
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2
8
T
H
S
T
2
7
T
H
S
T
N
2
4
T
H
S
T
JONES AVE NE
CLOVER CREEK
EXISTING CONDITIONS EXHIBIT
R. THOMAS
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE $$$$DATE$$$
$$$$$$$$DESIGNFILENAME$$$$$$
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH10
PLOTTED BY
DATE
.
.
.
.
.
.
.
$$USERNAME$$
$TIME$
SCALE IN FEET
0 50 100
INTERSTATE
405 Project Team
Washington State
Department of Transportation
MP 7.00
MP 7.05
MP 7.10 MP 7.15 MP 7.20 MP 7.25
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
21
6
JONES AVE. NE
WETLAND 7.2R
MAY CREEK
SB I-405 ON RAMP
SB I-405
NB I-405
DA SB I-405 ON RAMP
DA NB I-405 OFF RAMP
NB
I-405
OFF
RAMP
S. TAYLOR
Lorena Eng
EXISTING CONDITIONS EXHIBIT
R. THOMAS
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE $$$$DATE$$$
$$$$$$$$DESIGNFILENAME$$$$$$
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH10
PLOTTED BY
DATE
.
.
.
.
.
.
.
$$USERNAME$$
$TIME$
SCALE IN FEET
0 50 100
INTERSTATE
405 Project Team
Washington State
Department of Transportation
M
P 7.20
M
P 7.25
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
21
7
S
B I-405
O
N
R
A
M
P
S
B I-405
N
B I-4
0
5
D
A
S
B I-4
0
5
O
N
R
A
M
P
D
A
N
B I-405
O
F
F
R
A
M
P
S. TAYLOR
WETLAND 7.1L WETLAND 7.15L
WETLAND 7.2L
MAY CREEK
WETLAND 7.2R
Lorena Eng
L
A
K
E
W
A
S
H
I
N
G
T
O
N
B
L
V
D
N
EXISTING CONDITIONS EXHIBIT
R. THOMAS
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE $$$$DATE$$$
$$$$$$$$DESIGNFILENAME$$$$$$
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH10
PLOTTED BY
DATE
.
.
.
.
.
.
.
$$USERNAME$$
$TIME$
SCALE IN FEET
0 50 100
INTERSTATE
405 Project Team
Washington State
Department of Transportation
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
MP 7.30 MP 7.35
M
P
7
.4
0
M
P
7
.
4
5
M
P
7.
5
0
M
P
7.
5
5
8
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
S
B
I
-
4
0
5
N
B
I
-
4
0
5
WETLAND 7.2R
WETLAND 7.35R
WETLAND 7.78L
WETLAND 7.66R
WETLAND 7.3R
NB405-NE44 LINE
LW
B
S
L
I
NE
DA_NB405-NE44 LINE
DA_NE44
-SB405
L
INE
N
E
4
4
L
I
N
E
N
E
4
3
R
D
S
T
N
E
4
4
T
H
S
T
GYPSY CREEK
S. TAYLOR
JONES AVE NE
S
B
4
0
5-
N
E
4
4
LI
N
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Lorena Eng
EXISTING CONDITIONS EXHIBIT
R. THOMAS
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE $$$$DATE$$$
$$$$$$$$DESIGNFILENAME$$$$$$
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH10
PLOTTED BY
DATE
.
.
.
.
.
.
.
$$USERNAME$$
$TIME$
SCALE IN FEET
0 50 100
INTERSTATE
405 Project Team
Washington State
Department of Transportation
MP 7.40
MP 7.45
MP 7.50
MP 7.55
MP 7.60
MP 7.65
T
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
9
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
SB I-405 OFF RAMP
SB I-405
NB I-405
DA SB I-405 OFF RAMP
DA NB I-405 ON RAMPSB I-405 ON RAMP
WETLAND 7.44L
WETLAND 7.5L
WETLAND 7.78L
WETLAND 7.42R
SEAHAWKS WAY
EASTSIDE RAIL CORRIDOR
GYPSY CREEK
S. TAYLOR
WETLAND 7.70L
WETLAND 7.55L
WETLAND 7.66RWETLAND 7.35R
N
D
V
L
B
N
O
T
G
N
IH
S
A
W
E
K
A
L
NE 44T
H ST
Lorena Eng
LAKE WASHINGTON
EXISTING CONDITIONS EXHIBIT
R. THOMAS
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE $$$$DATE$$$
$$$$$$$$DESIGNFILENAME$$$$$$
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH10
PLOTTED BY
DATE
.
.
.
.
.
.
.
$$USERNAME$$
$TIME$
SCALE IN FEET
0 50 100
INTERSTATE
405 Project Team
Washington State
Department of Transportation
MP 7.65
MP 7.70
MP 7.75
MP 7.80
MP 7.85
MP 7.90
MP 7.95
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
SB I-405
NB I-405
NB I-405 OFF RAMPSB I-405 ON RAMP
DA SB I-405 OFF RAMP
DA NB I-405 ON RAMP
WETLAND 7.78L
WETLAND 7.42R
WETLAND 7.79L
WETLAND 7.8L
WETLAND 7.84R
WETLAND 7.83R
WETLAND 7.82R
STREAM 7.7
STREAM 7.7A
EASTSIDE RAIL CORRIDOR
RIPLEY LN N
LAKE WASHINGTON BLVD NE
S
E
7
6
T
H
S
T.
S. TAYLOR
WETLAND 7.70L
SEAHAWKS WAY
10
Lorena Eng
EXISTING CONDITIONS EXHIBIT
STREAM 7.8
R. THOMAS
NB I-405 OFF RAMP
NB I-405 ON RAMP
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE $$$$DATE$$$
$$$$$$$$DESIGNFILENAME$$$$$$
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH10
PLOTTED BY
DATE
.
.
.
.
.
.
.
$$USERNAME$$
$TIME$
SCALE IN FEET
0 50 100
INTERSTATE
405 Project Team
Washington State
Department of Transportation
MP 8.00
MP 8.05
MP 8.10
MP 8.15 MP 8.20
MP 8.25
T
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
SB I-405
NB I-405
WETLAND 8.05R
WETLAND 8.2R
WETLAND 8.2L
EASTSIDE RAIL CORRIDOR
11S. TAYLOR
LAKE
WASH
INGTON
BLVD
SE
Lorena Eng
RIPLEY LN SE
BIKE PATH
BIKE PATH
LAKE WASHINGTON
EXISTING CONDITIONS EXHIBIT
STREAM 8.05
STREAM 8.12 STREAM 8.15
STREAM 8.22
R. THOMAS
STREAM 8.05
DESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE $$$$DATE$$$
$$$$$$$$DESIGNFILENAME$$$$$$
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
JOB NUMBER
REGION
NO.
STATE FED.AID PROJ.NO.
WASH10
PLOTTED BY
DATE
.
.
.
.
.
.
.
$$USERNAME$$
$TIME$
SCALE IN FEET
0 50 100
INTERSTATE
405 Project Team
Washington State
Department of Transportation
MP 8.30
MP 8.35
MP 8.40
MP 8.45
MP 8.50
MP 8.55
T
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
SB I-405
NB I-405
WETLAND 8.4L WETLAND 8.44L
WETLAND 8.5L
EASTSIDE RAIL CORRIDOR
109TH AVE SE
106TH AVE SE
12S. TAYLOR
Lorena Eng
RIPLEY LN
HAZELWOOD LN
BIKE PATH
EXISTING CONDITIONS EXHIBIT
STREAM 8.31
STREAM 8.55
R. THOMAS
STREAM 8.55
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405 Project Team
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MP 8.55
MP 8.60
MP
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0
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WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
WETLAND 8.6R
WETLAND 8.75L
WETLAND 8.8L
SB
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106TH AVE SE
EASTSIDE RAIL CORRIDOR
STREAM 8.7
STREAM 8.7
13S. TAYLOR
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Lorena Eng
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405 Project Team
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Department of Transportation
MP 9.15
MP 9.20
MP 9.25
MP 9.30
MP 9.35
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
WETLAND 9.2R
WETLAND 9.3R
WETLAND 9.32R
SB I-405
NB I-405 NB I-405 ON RAMP
DA SB I-405 OFF RAMP
DA NB I-405 ON RAMP
112TH
AVE
SE
PARK & RIDE
113TH AVE SE
LAKEHURST CREEK
14
S. TAYLOR
Lorena Eng
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405 Project Team
Washington State
Department of Transportation
MP 9.30
MP 9.35
MP 9.40
MP 9.45
MP 9.50
MP 9.55
MP 9.60
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
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21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
WETLAND 9.5L
SB I-405
NB I-405
SB I-405 OFF RAMP
DA SB I-405 OFF RAMP
DA NB I-405 ON RAMP
NB I-405 ON RAMP
EASTS
IDE
RA
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CORR
IDOR
LAKE WASHINGTON BLVD SE
15
S. TAYLOR
Lorena Eng
EXISTING CONDITIONS EXHIBIT
LAKEHURST CREEK
WETLAND 9.32R
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405 Project Team
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Department of Transportation
MP 9.65
MP 9.70
MP 9.75
MP 9.80 MP 9.85
M
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9.
9
0
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
Lorena Eng
WETLAND 9.68L
LAKE W ASHINGTON BLVD SE
WETLAND 9.83L
EASTSIDE RAIL CORRIDOR
SB I-405
NB I-405
BICYCLE PATHBICYCLE PATH
116TH AVE SE
16
S. TAYLOR
WETLAND 9.82L
EXISTING CONDITIONS EXHIBIT
STREAM 9.8
STREAM 9.9
STREAM 9.9
R. THOMAS
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M
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M
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9.
9
5
M
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1
0.
0
0
M
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1
0
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5
MP
10
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10
MP 10.15
MP 10.20
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
Lorena Eng
WETLAND 10.01R
WETLAND 10.16L
WETLAND 10.0L
E
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COAL CREEK
BICYCLE PATH
17
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WETLAND 10.05R
CO A L CREEK PKW
A Y SE
EXISTING CONDITIONS EXHIBIT
STREAM 10.0
COAL CREEK
R. THOMAS
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MP 10.15
M
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10.20
M
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1
0.
2
5
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
Lorena Eng
WETLAND 10.16L
WETLAND 10.25L-A
WETLAND 10.25L-B
ES YWKP KEERC LAOC
120TH AVE SE
LAKE WASHINGTON BLVD SE
COAL CREEK
BI
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S
B I-
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18
WETLAND 10.0L
S. TAYLOR
WETLAND 118-3
RODIRROC LIAR EDISTSAE
EXISTING CONDITIONS EXHIBIT
R. THOMAS
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TIME
DATE $$$$DATE$$$
$$$$$$$$DESIGNFILENAME$$$$$$
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405 Project Team
Washington State
Department of Transportation
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
Lorena Eng
RODIRROC
LIAR
EDISTSAE
19
S. TAYLOR
WETLAND 118-3
WETLAND 118-3
WETLAND 118-2
WETLAND 118-1
WETLAND 118-1
120TH AVE SE
S
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4
2
N
D
S
T
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4
2
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D
C
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4
O
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118TH AVE SEBIKE PATH
S
E
4
0
T
H
S
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EXISTING CONDITIONS EXHIBIT
R. THOMAS
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DATE $$$$DATE$$$
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405 Project Team
Washington State
Department of Transportation
M
P
1
0
.8
5
MP
10
.90
MP 10.95 MP 11.00
MP 11.10
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
Lorena Eng
WETLAND 10.9L
SB I-405
NB I-405 OFF RAMP TO EB 90
NB I-405
E
B
I -
9
0
W
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9
0
S
E
3
5
T
H
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T
S
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3
6
T
H
S
T
S
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3
7
T
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S
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3
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T
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SB I-405 ON RAMP
P M
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5
0
4
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B
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0
9
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I
B
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20
S. TAYLOR
EXISTING CONDITIONS EXHIBIT
R. THOMAS
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WETLAND BOUNDARY
WETLAND
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LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
WETLAND 10.8L
21XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
118TH AVE SE
E
B
I
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9
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W
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9
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21
S. TAYLOR
WETLAND 118-4
W
B I-90
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23 ES
Lorena Eng
EXISTING CONDITIONS EXHIBIT
R. THOMAS
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Department of Transportation
MP 12.35
MP 12.40
MP 12.45
MP 12.50
MP 12.55
MP 12.60
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
1
XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
Lorena Eng
WETLAND 12.45L
SB I-405
NB I-405
W
I
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B
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O
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E
D
XI
N
G
K
C
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SB405 LINE
NB405 LINE
3
WETLAND 12.4L
118TH AVE SE
EXISTING CONDITIONS EXHIBIT
R. THOMAS
S. TAYLOR
HIXSON CREEK
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405 Project Team
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Department of Transportation
MP 12.75
MP 12.80 MP 12.85 MP 12.90 MP 12.95 MP 13.00
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
WETLAND 13.0R
WETLAND 12.82R
2
XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
Lorena Eng
NB I-405 ON RAMP
SB I-405
NB I-405
114TH AVE SE
1
1
6
T
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3
S E 8 T H
S T
ROTCENNOC SLLIH EKAL
S E
6 T
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S T
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8
T
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EXISTING CONDITIONS EXHIBIT
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Department of Transportation
MP 13.05
MP
13
.10
M
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1
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5
M
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1
3.
2
0
M
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2
5
M
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3.
3
0
T
WETLAND BOUNDARY
WETLAND
WETLAND BUFFER
LEGEND
MARK BOUNDARY
ORDINARY HIGH WATER
STREAM BUFFER
DITCH BOTTOM
STREAM CENTER LINE
PIPED STREAM
FLOW DIRECTIONOR
PROPERTY LINES
3
XL4653
I-405
RENTON TO BELLEVUE
CORRIDOR WIDENING & EXPRESS TOLL LANES
Lorena Eng
S
B
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WETLAND 13.25R
1
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4
T
H
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S
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3
1
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6
T
H
A
V
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S
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STURTEVANT CREEK
EXISTING CONDITIONS EXHIBIT
R. THOMAS
S. TAYLOR
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Bellevue / KING Sampling Date:5/26/2016
Applicant/Owner:WSDOT State:WA Sampling
Point:
SP 10.01R-U
Investigators:DALZELL/FOX Section, Township, Range:Sec 16 / T24N / R.05E
Landform (hillslope, terrace, etc.):Footslope Local Relief (concave, convex, none):None Slope(%):3
Subregion (LRR):A Lat:47.566227 Long:-122.181709 Datum:WGS84
Soil Map Unit Name:Urban land NWI Classification:Upland
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes No X Is the Sampled Area
Wetland Hydrology Present?Yes No X within a Wetland?Yes No X
Remarks:
2 of 3 criteria are absent; therefore, this sample plot is not within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:1 (A)
2.Total Number of Dominant
3.Species Across All Strata:1 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 90 Yes FAC Total % Cover of:Multiply by:
2.Salix scouleriana 5 No FAC OBL species x1=
3.FACW species x2=0
4.FAC species 95 x3=285
5.FACU species x4=0
95 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:95 (A)285 (B)
1.
2.Prevalence Index = B/A=3.00
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
= Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum 5 % Cover of Biotic Crust
Remarks:
Sample plot meets the dominance test and prevalence index.
SOIL Sampling Point:SP 10.01R-U
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-7 10YR3/2 100 Silt Loam
7-12 2.5Y4/1 60 Clay Loam
7-12 2.5Y4/3 40 Clay Loam
12-18 2.5Y4/3 100 Sandy Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes No X
Remarks:
No hydric soil indicators are present in sample plot.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes No X
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
No hydrology indicators are present in sample plot.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Bellevue / KING Sampling Date:5/26/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 10.01R-W
Investigators:WITTER/DALZELL Section, Township, Range:SEC 16 / T.24N / R.05E
Landform (hillslope, terrace, etc.):Depression Local Relief (concave, convex, none):Concave Slope(%):0
Subregion (LRR):A Lat:47.566319 Long:-122.181633 Datum:WGS84
Soil Map Unit Name:Urban Land NWI Classification:PSS 1
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes X No Is the Sampled Area
Wetland Hydrology Present?Yes X No within a Wetland?Yes X No
Remarks:
All 3 criteria are present; therefore, sample plot is within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:2 (A)
2.Total Number of Dominant
3.Species Across All Strata:2 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Salix sitchensis 40 Yes FACW Total % Cover of:Multiply by:
2.Lonicera involucrata 35 Yes FAC OBL species x1=
3.Rubus armeniacus 20 No FAC FACW species 40 x2=80
4.Ilex aquifolium 10 No FACU FAC species 55 x3=165
5.FACU species 10 x4=40
105 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:105 (A)285 (B)
1.
2.Prevalence Index = B/A=2.71
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
= Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum 20 % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test and prevalence index. Very dense wetland with Rubus armeniacus on fringe infiltrating and choking out the willow
shrubs.
SOIL Sampling Point:SP 10.01R-W
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-6 10YR 3/1 100 0
6-10 G1 4/10Y 90 10YR 4/3 10 C M Sandy Loam
10-18 10YR 4/3 90 10YR 4/1 10 D M Sandy Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)X Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes X No
Remarks:
Sample plot meets F2
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except X Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
X Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No Depth (inches):
Water Table Present? Yes No Depth (inches):
Saturation Present?Yes X No Depth (inches):16.0 Wetland Hydrology Present?Yes X No
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
Evidence of ponding and water marks are present at the sample plot (meets B1).
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Bellevue / KING Sampling Date:5/26/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 10.05R-U
Investigators:WITTER/DALZELL Section, Township, Range:SEC 16 / T.24N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):5
Subregion (LRR):A Lat:47.566380 Long:-122.180618 Datum:WGS84
Soil Map Unit Name:Alderwood and Kitsap soils, very steep NWI Classification:Upland
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes No X Is the Sampled Area
Wetland Hydrology Present?Yes No X within a Wetland?Yes No X
Remarks:
2 of 3 criteria are absent; therefore, sample plot is not within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.Acer macrophyllum 70 Yes FACU That Are OBL, FACW, or FAC:5 (A)
2.Alnus rubra 20 Yes FAC Total Number of Dominant
3.Species Across All Strata:8 (B)
4.Percent of Dominant Species
90 = Total Cover That Are OBL, FACW, or FAC:62.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 45 Yes FAC Total % Cover of:Multiply by:
2.Rubus spectabilis 30 Yes FAC OBL species x1=
3.Frangula purshiana 25 Yes FAC FACW species 5 x2=10
4.FAC species 120 x3=360
5.FACU species 95 x4=380
100 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:220 (A)750 (B)
1.Polystichum munitum 10 Yes FACU
2.Equisetum telmateia 5 Yes FACW Prevalence Index = B/A=3.41
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
15 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Rubus ursinus 15 Yes FACU Hydrophytic
2.Vegetation Yes X No
15 = Total Cover Present?
% Bare Ground in Herb Stratum % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test
SOIL Sampling Point:SP 10.05R-U
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-8 10YR3/2 100 Silt Loam
8-16 10YR4/2 30 7.5YR4/3 3 Sandy Loam 67% Gravel Approx 2-3" Wide
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:Compacted Gravel
Depth (inches):16 Hydric Soil Present?Yes No X
Remarks:
No hydric soil indicators present in sample plot.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes No X
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
No hydrology indicators present in sample plot.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Bellevue / KING Sampling Date:5/26/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 10.05R-W
Investigators:WITTER/DALZELL Section, Township, Range:SEC 16 / T.24N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):5
Subregion (LRR):A Lat:47.566254 Long:-122.180595 Datum:WGS84
Soil Map Unit Name:Alderwood and Kitsap soils, very steep NWI Classification:PFO / PSS1
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes X No Is the Sampled Area
Wetland Hydrology Present?Yes X No within a Wetland?Yes X No
Remarks:
All 3 criteria are present; therefore, sample plot is within a wetland. Sample plot is located on a terrace where hillside seep gets collected.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.Alnus rubra 40 Yes FAC That Are OBL, FACW, or FAC:5 (A)
2.Total Number of Dominant
3.Species Across All Strata:6 (B)
4.Percent of Dominant Species
40 = Total Cover That Are OBL, FACW, or FAC:83.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus spectabilis 30 Yes FAC Total % Cover of:Multiply by:
2.Rubus armeniacus 20 Yes FAC OBL species x1=
3.Rubus ursinus 20 Yes FACU FACW species 85 x2=170
4.Acer circinatum 15 No FAC FAC species 130 x3=390
5.Ribes divaricatum 15 No FAC FACU species 20 x4=80
100 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:235 (A)640 (B)
1.Equisetum telmateia 50 Yes FACW
2.Phalaris arundinacea 35 Yes FACW Prevalence Index = B/A=2.72
3.Cardamine oligosperma 10 No FAC Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
95 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum 10 % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test and prevalence index.
SOIL Sampling Point:SP 10.05R-W
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-10 10YR 3/2 97 10YR4/6 3 C PL Silt Loam Alpha Alpha Positive
10-18 G1 2.5/10Y 100 Sandy Clay
Loam
Alpha Alpha Positive
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)X Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes X No
Remarks:
Positive reaction to alpha, alpha-dipyridyl indicates that hydric soil is present.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
X Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes X No Depth (inches):0.0 Wetland Hydrology Present?Yes X No
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
Sample plot meets wetland hydrology indicator for surface saturation (A3).
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Bellevue / KING Sampling Date:5/24/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 10.0L-U
Investigators:DALZELL/FOX Section, Township, Range:SEC 16 / T.24N / R.05E
Landform (hillslope, terrace, etc.):Depression Local Relief (concave, convex, none):None Slope(%):10
Subregion (LRR):A Lat:47.567299 Long:-122.181870 Datum:WGS84
Soil Map Unit Name:Alderwood gravelly sandy loam, 15 to 30 percent slopes NWI Classification:Upland
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes No X Is the Sampled Area
Wetland Hydrology Present?Yes No X within a Wetland?Yes No X
Remarks:
2 of 3 criteria are absent; therefore, plot is not within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.Populus balsamifera 10 Yes FAC That Are OBL, FACW, or FAC:3 (A)
2.Acer macrophyllum 5 Yes FACU Total Number of Dominant
3.Species Across All Strata:5 (B)
4.Percent of Dominant Species
15 = Total Cover That Are OBL, FACW, or FAC:60.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 90 Yes FAC Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species 5 x2=10
4.FAC species 118 x3=354
5.FACU species 20 x4=80
90 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:143 (A)444 (B)
1.Polystichum munitum 15 Yes FACU
2.Agrostis stolonifera 10 Yes FAC Prevalence Index = B/A=3.10
3.Poa pratensis 5 No FAC Hydrophytic Vegetation Indicators:
4.Phalaris arundinacea 5 No FACW 1 - Rapid Test for Hydrophytic Vegetation
5.Holcus lanatus 3 No FAC X 2 - Dominance Test is >50%
6.3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
38 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test.
SOIL Sampling Point:SP 10.0L-U
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-12 10YR4/2 100 Sandy Loam
12-19 10YR4/3 100 Sandy Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes No X
Remarks:
No hydric soil indicators are present in sample plot.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes No X
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
No wetland hydrology indicators are present in sample plot.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Bellevue / King Sampling Date:6/23/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 10.0L-W
Investigators:Dalzell / Ivison-Lane Section, Township, Range:SEC 16 / T.24N / R.05E
Landform (hillslope, terrace, etc.):Depression Local Relief (concave, convex, none):Concave Slope(%):0
Subregion (LRR):A Lat:47.567276 Long:-122.181923 Datum:WGS84
Soil Map Unit Name:Alderwood gravelly sandy loam, 15 to 30 percent slopes NWI Classification:PEM1
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes X No Is the Sampled Area
Wetland Hydrology Present?Yes X No within a Wetland?Yes X No
Remarks:
Sample plot meet 3 of 3 criteria; Therefore, plot is within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:1 (A)
2.Total Number of Dominant
3.Species Across All Strata:2 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:50.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 5 Yes FACU Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species 100 x2=200
4.FAC species x3=0
5.FACU species 5 x4=20
5 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:105 (A)220 (B)
1.Phalaris arundinacea 100 Yes FACW
2.Prevalence Index = B/A=2.10
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
100 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum % Cover of Biotic Crust
Remarks:
Sample plot meets prevalence index.
SOIL Sampling Point:SP 10.0L-W
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-7 10YR3/2 100 Silt Loam
7-19 10YR5/2 95 10YR4/6 5 C M Silt Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)X Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes X No
Remarks:
Sample plot meets F3
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
X Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
X High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
X Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes X No Depth (inches):2.00
Water Table Present? Yes X No Depth (inches):6.0
Saturation Present?Yes X No Depth (inches):0.0 Wetland Hydrology Present?Yes X No
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
Surface water is present in nearby drainage way next to soil pit. Sample plot meets hydrology indicators for A1, A2, A3.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Bellevue / KING Sampling Date:6/16/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 10.16L-U
Investigators:WITTER/DALZELL Section, Township, Range:SEC 16 / T.24N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):25
Subregion (LRR):A Lat:47.568520 Long:-122.180595 Datum:WGS84
Soil Map Unit Name:Alderwood gravelly sandy loam, 15 to 30 percent slopes NWI Classification:Upland
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes No X Is the Sampled Area
Wetland Hydrology Present?Yes No X within a Wetland?Yes No X
Remarks:
2 out of 3 criteria are absent; therefore, this sample plot is not in a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.Populus balsamifera 40 Yes FAC That Are OBL, FACW, or FAC:5 (A)
2.Alnus rubra 20 Yes FAC Total Number of Dominant
3.Acer macrophyllum 20 Yes FACU Species Across All Strata:7 (B)
4.Percent of Dominant Species
80 = Total Cover That Are OBL, FACW, or FAC:71.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 30 Yes FAC Total % Cover of:Multiply by:
2.Cornus alba 20 Yes FACW OBL species x1=
3.FACW species 35 x2=70
4.FAC species 90 x3=270
5.FACU species 35 x4=140
50 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:160 (A)480 (B)
1.Polystichum munitum 15 Yes FACU
2.Equisetum telmateia 15 Yes FACW Prevalence Index = B/A=3.00
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
30 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum 25 % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test and prevalence index. Plot located on steep slope adjacent to trail.
SOIL Sampling Point:SP 10.16L-U
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-18 10YR 3/3 100 0 Silt Loam No Redox
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes No X
Remarks:
No hydric soil indicators are present in sample plot.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes No X
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
No wetland hydrology indicators are present in sample plot.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Bellevue / KING Sampling Date:6/16/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 10.16L-W
Investigators:WITTER/DALZELL Section, Township, Range:SEC 16 / T.24N / R.05E
Landform (hillslope, terrace, etc.):Depression Local Relief (concave, convex, none):Concave Slope(%):0
Subregion (LRR):A Lat:47.568527 Long:-122.180733 Datum:WGS84
Soil Map Unit Name:Alderwood and Kitsap soils, very steep NWI Classification:PSS1
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes X No Is the Sampled Area
Wetland Hydrology Present?Yes X No within a Wetland?Yes X No
Remarks:
3 out of 3 criteria present, therefore; sample plot is within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:4 (A)
2.Total Number of Dominant
3.Species Across All Strata:4 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Cornus alba 40 Yes FACW Total % Cover of:Multiply by:
2.Ribes divaricatum 10 Yes FAC OBL species 20 x1=20
3.FACW species 60 x2=120
4.FAC species 10 x3=30
5.FACU species x4=0
50 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:90 (A)170 (B)
1.Equisetum telmateia 20 Yes FACW
2.Lysichiton americanus 20 Yes OBL Prevalence Index = B/A=1.89
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
40 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum 60 % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test and prevalence index.
SOIL Sampling Point:SP 10.16L-W
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-7 2.5Y2.5/1 100 Silt Loam
7-9 GLEY1 4/N 100 Silty Clay
Loam
H2S
9-18 GLEY1 4/10Y 100 Sand H2S, Decomposed Plant
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
X Hydrogen Sulfide (A4)X Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes X No
Remarks:
Sample plot meets hydric soil indicators for A4 and F2
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
X Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
X High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
X Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) X Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes X No Depth (inches):1.00
Water Table Present? Yes X No Depth (inches):10.0
Saturation Present?Yes X No Depth (inches):0.0 Wetland Hydrology Present?Yes X No
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
Sample plot meets wetland hydrology indictors for A1, A2, A3, and C1.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Bellevue / KING Sampling Date:5/24/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 10.25LA-U
Investigators:Maki Dalzell /Dangelei Fox Section, Township, Range:SEC 16 / T.24N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):Convex Slope(%):4
Subregion (LRR):A Lat:47.569405 Long:-122.179749 Datum:WGS84
Soil Map Unit Name:Urban Use NWI Classification:Upland
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes No X Is the Sampled Area
Wetland Hydrology Present?Yes No X within a Wetland?Yes No X
Remarks:
2 of 3 criteria are absent; therefore, sample plot is not within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.Alnus rubra 70 Yes FAC That Are OBL, FACW, or FAC:3 (A)
2.Total Number of Dominant
3.Species Across All Strata:3 (B)
4.Percent of Dominant Species
70 = Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 20 Yes FAC Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species x2=0
4.FAC species 130 x3=390
5.FACU species x4=0
20 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:130 (A)390 (B)
1.Festuca rubra 40 Yes FAC
2.Prevalence Index = B/A=3.00
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
40 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test and prevalence index.
SOIL Sampling Point:SP 10.25LA-U
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-7 10YR2/2 100 NONE 0 Sandy Loam
7-18 10YR3/2 100 NONE 0 Sandy Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes No X
Remarks:
No hydric soil indicators are present in sample plot.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes No X
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
No wetland hydrology indicators present in sample plot.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County: Bellevue / KING Sampling Date:5/24/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 10.25LA-W
Investigators:DALZELL/FOX Section, Township, Range:SEC 16 / T.24N / R.05E
Landform (hillslope, terrace, etc.):Footslope Local Relief (concave, convex, none):None Slope(%):3
Subregion (LRR):A Lat:47.569458 Long:-122.179634 Datum:WGS84
Soil Map Unit Name:Urban Land NWI Classification:PEM1
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes X No Is the Sampled Area
Wetland Hydrology Present?Yes X No within a Wetland?Yes X No
Remarks:
All 3 criteria are present; therefore, sample plot is within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:3 (A)
2.Total Number of Dominant
3.Species Across All Strata:3 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 5 Yes FAC Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species 63 x2=126
4.FAC species 25 x3=75
5.FACU species x4=0
5 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:88 (A)201 (B)
1.Equisetum telmateia 60 Yes FACW
2.Festuca rubra 20 Yes FAC Prevalence Index = B/A=2.28
3.Juncus effusus 3 No FACW Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
83 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test and prevalence index.
SOIL Sampling Point:SP 10.25LA-W
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-6 10YR3/1 100 Sandy Loam Gravel, alpha-alpha positive
6-12 10YR4/1 100 Sandy Loam Gravel
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains.²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)X Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:Compacted Gravel
Depth (inches):12 Hydric Soil Present?Yes X No
Remarks:
Positive reaction to Alpha alpha-dipyridyl and landscape position indicate that hydric soil is present.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
X Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes X No Depth (inches):6.0 Wetland Hydrology Present?Yes X No
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
Hydrologic indicator A3 is present in sample plot.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Bellevue / KING Sampling Date:5/24/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 10.25LB-U
Investigators:DALZELL/FOX Section, Township, Range:SEC 16 / T.24N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):3
Subregion (LRR):A Lat:47.569084 Long:-122.179733 Datum:WGS84
Soil Map Unit Name:Urban land NWI Classification:Upland
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes No X Is the Sampled Area
Wetland Hydrology Present?Yes No X within a Wetland?Yes No X
Remarks:
2 of 3 criteria are absent; therefore, plot is not within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:3 (A)
2.Total Number of Dominant
3.Species Across All Strata:3 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 40 Yes FAC Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species 23 x2=46
4.FAC species 40 x3=120
5.FACU species x4=0
40 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:63 (A)166 (B)
1.Equisetum telmateia 15 Yes FACW
2.Juncus effusus 5 Yes FACW Prevalence Index = B/A=2.63
3.Phalaris arundinacea 3 No FACW Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
23 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum 30 % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test and prevalence index. 1 inch thick of mulch present.
SOIL Sampling Point:SP 10.25LB-U
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-18 2.5Y4/3 100 Loamy Sand
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes No X
Remarks:
Sample plot does not meet any hydric soil indicators. Soil moist but not saturated.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes No X
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
No wetland hydrology indicators present in sample plot.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Bellevue/King Sampling Date:6/24/2016
Applicant/Owner:WSDOT State:WA Sampling
Point:
SP 10.25LB-W
Investigators:Dalzell / Ivison-Lane Section, Township, Range:SEC 16 / T.24N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):3
Subregion (LRR):A Lat:47.569092 Long:-122.179878 Datum:WGS84
Soil Map Unit Name:Urban Land NWI Classification:PEM1
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes X No Is the Sampled Area
Wetland Hydrology Present?Yes X No within a Wetland?Yes X No
Remarks:
3 of 3 criteria present; therefore, plot is within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:2 (A)
2.Total Number of Dominant
3.Species Across All Strata:2 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Total % Cover of:Multiply by:
2.OBL species 60 x1=60
3.FACW species 5 x2=10
4.FAC species 35 x3=105
5.FACU species x4=0
= Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:100 (A)175 (B)
1.Nasturtium officinale 60 Yes OBL
2.Solanum dulcamara 30 Yes FAC Prevalence Index = B/A=1.75
3.Lotus corniculatus 5 No FAC Hydrophytic Vegetation Indicators:
4.Equisetum telmateia 5 No FACW 1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
100 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum % Cover of Biotic Crust
Remarks:
Sample plot meets prevalence index and dominance test.
SOIL Sampling Point:SP 10.25LB-W
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-2 10YR3/1 100 Sandy Loam
2-14 2.5Y5/2 95 7.5YR3/3 5 C M Loamy Sand
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)X Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:Compacted gravel
Depth (inches):14 Hydric Soil Present?Yes X No
Remarks:
Sample plot meets hydric conditions for S5.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
X Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
X High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
X Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes X No Depth (inches):1.00
Water Table Present? Yes X No Depth (inches):0.0
Saturation Present?Yes X No Depth (inches):0.0 Wetland Hydrology Present?Yes X No
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
Sample plot meets wetland hydrology indicators for A1, A2, A3.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Bellevue / KING Sampling Date:6/2/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 10.9L-U
Investigators:WITTER/DALZELL Section, Township, Range:SEC 9 / T.24N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):Concave Slope(%):0
Subregion (LRR):A Lat:47.578651 Long:-122.175751 Datum:WGS84
Soil Map Unit Name:Alderwood gravelly sandy loam, 8 to 15 percent slopes NWI Classification:Upland
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes No X
Hydric Soil Present?Yes X No Is the Sampled Area
Wetland Hydrology Present?Yes No X within a Wetland?Yes No X
Remarks:
2 of 3 criteria are absent; therefore, sample plot is not within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:2 (A)
2.Total Number of Dominant
3.Species Across All Strata:4 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:50.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 50 Yes FAC Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species x2=0
4.FAC species 100 x3=300
5.FACU species 45 x4=180
50 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:145 (A)480 (B)
1.Poa pratensis 35 Yes FAC
2.Anthoxanthum odoratum 25 Yes FACU Prevalence Index = B/A=3.31
3.Polystichum munitum 20 Yes FACU Hydrophytic Vegetation Indicators:
4.Schedonorus arundinaceus 15 No FAC 1 - Rapid Test for Hydrophytic Vegetation
5.2 - Dominance Test is >50%
6.3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
95 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes No X
= Total Cover Present?
% Bare Ground in Herb Stratum 0 % Cover of Biotic Crust
Remarks:
No hydrophytic vegetation indicators present in sample plot.
SOIL Sampling Point:SP 10.9L-U
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-7 10YR 3/2 100 Sandy Loam
7-12 2.5Y 5/2 95 10YR 4/6 5 C PL Sandy Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)X Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:COMPACTED GRAVEL
Depth (inches):12 Hydric Soil Present?Yes X No
Remarks:
Sample plot meets hydric soil indicator F3. Six inches of depleted matrix is likely present between 7 and 12+ inches.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes No X
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
Sample plot does not meet any wetland hydrology indicators.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Bellevue / KING Sampling Date:6/2/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 10.9L-W
Investigators:WITTER/DALZELL Section, Township, Range:SEC 9 / T.24N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):Concave Slope(%):0
Subregion (LRR):A Lat:47.578655 Long:-122.175880 Datum:WGS84
Soil Map Unit Name:Alderwood gravelly sandy loam, 8 to 15 percent slopes NWI Classification:PSS1
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes X No Is the Sampled Area
Wetland Hydrology Present?Yes X No within a Wetland?Yes X No
Remarks:
All 3 criteria are present; therefore, plot is within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:2 (A)
2.Total Number of Dominant
3.Species Across All Strata:3 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:67.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 25 Yes FAC Total % Cover of:Multiply by:
2.Rosa rugosa 15 Yes UPL OBL species x1=
3.FACW species 75 x2=150
4.FAC species 40 x3=120
5.FACU species x4=0
40 = Total Cover UPL species 15 x5=75
Herb Stratum (Plot size: )Column Totals:130 (A)345 (B)
1.Phalaris arundinacea 75 Yes FACW
2.Schedonorus arundinaceus 15 No FAC Prevalence Index = B/A=2.65
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
90 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum 0 % Cover of Biotic Crust
Remarks:
Him bob expanding over past 3 years. Sample plot meets dominance test and prevalence index.
SOIL Sampling Point:SP 10.9L-W
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-4 10YR 3/2 100 Sandy Loam
4-10 10YR 4/2 0 Sandy Loam
10-16 2.5Y 4/2 95 2.5Y 4/4 5 C PL Sandy Loam
16-18 2.5Y 4/2 100 0 Sandy Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)X Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes X No
Remarks:
Sample plot meets hydric soil indicator for F3.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)X FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B X Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes X No
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
No wetland hydrology was observed at the sample plot. This wetland may have been getting drier due to the construction of a new storm water pond located
east of the wetland. However, it is assumed that the wetland would still have hydrology during the early growing season. Therefore wetland hydrology is
assumed to be present -- further monitoring may be required for hydrology.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:KING Sampling Date:8/1/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 12.45L-U
Investigators:WITTER/DALZELL/THOMAS Section, Township, Range:Sec 4/T24N/R5E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):15
Subregion (LRR):A Lat:47.598846 Long:-122.180641 Datum:WGS84
Soil Map Unit Name:Kitsap silt loam, 15 to 30 percent slopes NWI Classification:Upland
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes No X Is the Sampled Area
Wetland Hydrology Present?Yes No X within a Wetland?Yes No X
Remarks:
2 out of 3 criteria are absent; therefore, this plot is not within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:2 (A)
2.Total Number of Dominant
3.Species Across All Strata:2 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 80 Yes FAC Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species 5 x2=10
4.FAC species 80 x3=240
5.FACU species x4=0
80 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:85 (A)250 (B)
1.Equisetum telmateia 5 Yes FACW
2.Prevalence Index = B/A=2.94
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
5 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum 95 % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test and prevalence index.
SOIL Sampling Point:SP 12.45L-U
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-12 10YR4/2 100 Silt Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:Compacted Gravel
Depth (inches):12 Hydric Soil Present?Yes No X
Remarks:
No hydric soil indicators are present. Sample plot is located on a compacted soil that is approximately 1foot higher than the area to the west. Because the area
is located in 405 median, the compacted soil is likely a fill from construction work.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes No X
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
No wetland hydrology was observed in the sample plot.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:BELLEVUE/KING Sampling Date:8/1/2016
Applicant/Owner:WSDOT State:WA Sampling
Point:
SP 12.45L-W
Investigators:WITTER/DALZELL/THOMAS Section, Township, Range:Sec 4/T24N/R5E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):10
Subregion (LRR):A Lat:47.598968 Long:-122.180563 Datum:WGS84
Soil Map Unit Name:Kitsap silt loam, 15 to 30 percent slopes NWI Classification:PFO1
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes X No Is the Sampled Area
Wetland Hydrology Present?Yes X No within a Wetland?Yes X No
Remarks:
All three criteria are present; the sample plot is located within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.Alnus rubra 40 Yes FAC That Are OBL, FACW, or FAC:4 (A)
2.Populus balsamifera 20 Yes FAC Total Number of Dominant
3.Species Across All Strata:4 (B)
4.Percent of Dominant Species
60 = Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species 50 x2=100
4.FAC species 75 x3=225
5.FACU species x4=0
= Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:125 (A)325 (B)
1.Equisetum telmateia 40 Yes FACW
2.Athyrium angustum 15 Yes FAC Prevalence Index = B/A=2.60
3.Phalaris arundinacea 10 No FACW Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
65 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test and prevalence index.
SOIL Sampling Point:SP 12.45L-W
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-8 10YR 4/2 100 0
8-18 5Y 4/1 65 10YR 4/4 35 C M Sandy Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)X Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes X No
Remarks:
Sample plot meets hydric soil criteria for F3
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
X Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes X No Depth (inches):8.0 Wetland Hydrology Present?Yes X No
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
Sample plot meets wetland hydrology criteria for A3.
Seepage goes to surface flow downslope from plot
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Renton / King Sampling Date:5/17/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 4.1R-NJ-U
Investigators:WITTER/DALZELL Section, Township, Range:SEC 17 / T.23N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):2
Subregion (LRR):A Lat:47.484428 Long:-122.194115 Datum:WGS84
Soil Map Unit Name:Urban land NWI Classification:Upland
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes No X
Hydric Soil Present?Yes No X Is the Sampled Area
Wetland Hydrology Present?Yes No X within a Wetland?Yes No X
Remarks:
all 3 criteria are absent; therefore, plot is not within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:2 (A)
2.Total Number of Dominant
3.Species Across All Strata:5 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:40.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 45 Yes FAC Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species 5 x2=10
4.FAC species 65 x3=195
5.FACU species 70 x4=280
45 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:140 (A)485 (B)
1.Geranium robertianum 30 Yes FACU
2.Agrostis stolonifera 20 Yes FAC Prevalence Index = B/A=3.46
3.Dactylis glomerata 20 Yes FACU Hydrophytic Vegetation Indicators:
4.Hypericum perforatum 20 Yes FACU 1 - Rapid Test for Hydrophytic Vegetation
5.Juncus effusus 5 No FACW 2 - Dominance Test is >50%
6.3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
95 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes No X
= Total Cover Present?
% Bare Ground in Herb Stratum O % Cover of Biotic Crust
Remarks:
No hydrophytic vegetation indicators are present at the sample plot.
SOIL Sampling Point:SP 4.1R-NJ-U
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-10 10YR 3/2 100 0 Sandy Loam
10-18 10YR 3/3 100 0 Sandy Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes No X
Remarks:
Sample plot does not meet any hydric soil indicators.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes No X
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
Sample plot does not meet any wetland hydrology indicators.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Renton / King Sampling Date:5/17/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 4.1R-NJ-W
Investigators:DALZELL/WITTER Section, Township, Range:SEC 17 / T.23N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):3
Subregion (LRR):A Lat:47.484432 Long:-122.194183 Datum:WGS84
Soil Map Unit Name:Urban land NWI Classification:PEM1
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes X No Is the Sampled Area
Wetland Hydrology Present?Yes X No within a Wetland?Yes X No
Remarks:
All 3 criteria are present; therefore, sample plot is within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:2 (A)
2.Total Number of Dominant
3.Species Across All Strata:2 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 5 Yes FAC Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species 95 x2=190
4.FAC species 5 x3=15
5.FACU species x4=0
5 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:100 (A)205 (B)
1.Phalaris arundinacea 95 Yes FACW
2.Prevalence Index = B/A=2.05
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
95 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test and prevalence index.
SOIL Sampling Point:SP 4.1R-NJ-W
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-10 10YR3/1 97 10YR4/6 3 C M Loamy Sand Gravel
10-16 GLEY1 4/10Y 100 Loamy Sand Gravel, H2S
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
X Hydrogen Sulfide (A4)X Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:Compacted Gravel
Depth (inches):16 Hydric Soil Present?Yes X No
Remarks:
Sulfuric odor at 10''. Sample plot meets hydric soil indicators for A4 and F2.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
X High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
X Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) X Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No Depth (inches):
Water Table Present? Yes X No Depth (inches):9.0
Saturation Present?Yes X No Depth (inches):0.0 Wetland Hydrology Present?Yes X No
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
Sample plot meets wetland hydrology indicator for saturation (A3), and has a high water table present (A2) and hydrogen sulfide odor (C1).
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Renton / KING Sampling Date:5/17/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 4.53R-U
Investigators:WITTER/DALZELL Section, Township, Range:SEC 8 / T.23N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):3
Subregion (LRR):A Lat:47.491093 Long:-122.191124 Datum:WGS84
Soil Map Unit Name:Alderwood and Kitsap soils, very steep NWI Classification:Upland
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes No X
Hydric Soil Present?Yes No X Is the Sampled Area
Wetland Hydrology Present?Yes No X within a Wetland?Yes No X
Remarks:
3 of 3 criteria are absent; therefore, plot is not within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.Thuja plicata 25 Yes FAC That Are OBL, FACW, or FAC:3 (A)
2.Pseudotsuga menziesii 20 Yes FACU Total Number of Dominant
3.Species Across All Strata:6 (B)
4.Percent of Dominant Species
45 = Total Cover That Are OBL, FACW, or FAC:50.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 90 Yes FAC Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species x2=0
4.FAC species 125 x3=375
5.FACU species 30 x4=120
90 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:155 (A)495 (B)
1.Holcus lanatus 10 Yes FAC
2.Galium aparine 5 Yes FACU Prevalence Index = B/A=3.19
3.Geranium robertianum 5 Yes FACU Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.2 - Dominance Test is >50%
6.3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
20 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes No X
= Total Cover Present?
% Bare Ground in Herb Stratum % Cover of Biotic Crust
Remarks:
No hydrophytic vegetation indicators are present.
SOIL Sampling Point:SP 4.53R-U
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-7 10YR3/2 100 Sandy Loam
7-19 2.5Y5/3 95 10YR4/6 5 Sandy Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes No X
Remarks:
No hydric soil indicators in sample plot.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes No X
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
No wetland hydrology indicators in sample plot.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Renton / KING Sampling Date:5/17/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 4.53R-W
Investigators:WITTER/DALZELL Section, Township, Range:SEC 8 / T.23N / R.05E
Landform (hillslope, terrace, etc.):Depression Local Relief (concave, convex, none):Concave Slope(%):0
Subregion (LRR):A Lat:47.491238 Long:-122.191139 Datum:WGS84
Soil Map Unit Name:Alderwood and Kitsap soils, very steep NWI Classification:PSS1
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes X No Is the Sampled Area
Wetland Hydrology Present?Yes X No within a Wetland?Yes X No
Remarks:
All 3 criteria are present; therefore, sample plot is within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:4 (A)
2.Total Number of Dominant
3.Species Across All Strata:4 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 60 Yes FAC Total % Cover of:Multiply by:
2.Salix babylonica 25 Yes FACW OBL species x1=
3.Betula papyrifera 15 No FAC FACW species 55 x2=110
4.Crataegus monogyna 10 No FAC FAC species 125 x3=375
5.FACU species 20 x4=80
110 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:200 (A)565 (B)
1.Ranunculus acris 30 Yes FAC
2.Juncus effusus 30 Yes FACW Prevalence Index = B/A=2.82
3.Cirsium arvense 10 No FAC Hydrophytic Vegetation Indicators:
4.Solidago canadensis 10 No FACU 1 - Rapid Test for Hydrophytic Vegetation
5.Tanacetum vulgare 10 No FACU X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
90 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum 0 % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test and prevalence index.
SOIL Sampling Point:SP 4.53R-W
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-9 10YR 3/2 100 0 Sandy Loam
9-16 2.5Y5/2 95 10YR 4/6 5 C M Sandy Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)X Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:COMPACTED GRAVEL
Depth (inches):16 Hydric Soil Present?Yes X No
Remarks:
Sample plot meet hydric soil indicator for F3.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
X Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes X No Depth (inches):6.0 Wetland Hydrology Present?Yes X No
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
Sample plot meets wetland hydrology indicator for A3.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Renton / KING Sampling Date:5/12/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 4.95L-U
Investigators:WITTER/DALZELL Section, Township, Range:SEC 8 / T.23N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):30
Subregion (LRR):A Lat:47.496571 Long:-122.194748 Datum:WGS84
Soil Map Unit Name:Urban Land NWI Classification:Upland
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes No X Is the Sampled Area
Wetland Hydrology Present?Yes No X within a Wetland?Yes No X
Remarks:
2 of 3 criteria are absent; therefore, plot is not within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: 30)% Cover Species?Status Number of Dominant Species
1.Populus balsamifera 25 Yes FAC That Are OBL, FACW, or FAC:3 (A)
2.Alnus rubra 20 Yes FAC Total Number of Dominant
3.Picea sitchensis 10 No FAC Species Across All Strata:3 (B)
4.Percent of Dominant Species
55 = Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: 30)Prevalence Index worksheet:
1.Thuja plicata 60 Yes FAC Total % Cover of:Multiply by:
2.Rubus armeniacus 10 No FAC OBL species x1=
3.Pseudotsuga menziesii 7 No FACU FACW species x2=0
4.FAC species 125 x3=375
5.FACU species 7 x4=28
77 = Total Cover UPL species x5=0
Herb Stratum (Plot size: 15)Column Totals:132 (A)403 (B)
1.
2.Prevalence Index = B/A=3.05
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
= Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: Na)
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum 75 % Cover of Biotic Crust Na
Remarks:
Sample plot meets dominance test. Plot on slope with dense evergreen canopy.
SOIL Sampling Point:SP 4.95L-U
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-4 10YR 2/2 100 0 Sandy Loam
4-18 10YR 5/3 100 0 Silt
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes No X
Remarks:
No hydric soil indicators present.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes No X
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
No hydrology indicators present.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Renton / KING Sampling Date:5/12/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 4.95L-W
Investigators:WITTER/DALZELL Section, Township, Range: SEC 8 / T.23N / R.05E
Landform (hillslope, terrace, etc.):Toeslope Local Relief (concave, convex, none):Concave Slope(%):0
Subregion (LRR):A Lat:47.496475 Long:-122.194946 Datum:WGS84
Soil Map Unit Name:Urban land NWI Classification:PSS1
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes X No Is the Sampled Area
Wetland Hydrology Present?Yes X No within a Wetland?Yes X No
Remarks:
All 3 criteria are present; therefore, sample plot is within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:3 (A)
2.Total Number of Dominant
3.Species Across All Strata:3 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Cornus alba 70 Yes FACW Total % Cover of:Multiply by:
2.Salix lasiandra 30 Yes FACW OBL species 40 x1=40
3.Rubus armeniacus 5 No FAC FACW species 100 x2=200
4.Rubus spectabilis 5 No FAC FAC species 10 x3=30
5.FACU species x4=0
110 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:150 (A)270 (B)
1.Carex obnupta 40 Yes OBL
2.Prevalence Index = B/A=1.80
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
40 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum 60 % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test and prevalence index.
SOIL Sampling Point:SP 4.95L-W
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-10 10YR 2/1 100 Organic Inclusion of decomposed plants
10-18 10YR2/1 10 Organic
10-18 GLEY1 4/10Y 90 Sandy Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
X Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)X Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes X No
Remarks:
Sample plot meets hydric soil indicators for A2 and F2.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
X Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
X High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
X Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes X No Depth (inches):1.50
Water Table Present? Yes X No Depth (inches):7.0
Saturation Present?Yes X No Depth (inches):0.0 Wetland Hydrology Present?Yes X No
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
Sample plot meets hydrology indicators for A1, A2, A3. Surface water Is present approximately 5' south from sp.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Renton/King Sampling Date:6/22/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 4.9R-U
Investigators:Dalzell/Ivison-Lane Section, Township, Range:SEC 8 / T.23N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):20
Subregion (LRR):A Lat:47.496143 Long:-122.193420 Datum:WGS84
Soil Map Unit Name:Urban land NWI Classification:Upland
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes No X Is the Sampled Area
Wetland Hydrology Present?Yes No X within a Wetland?Yes No X
Remarks:
2 of 3 criteria are absent; therefore, sample plot is not within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:2 (A)
2.Total Number of Dominant
3.Species Across All Strata:2 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species 20 x2=40
4.FAC species 5 x3=15
5.FACU species x4=0
= Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:25 (A)55 (B)
1.Equisetum telmateia 20 Yes FACW
2.Schedonorus arundinaceus 5 Yes FAC Prevalence Index = B/A=2.20
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
25 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum 75 % Cover of Biotic Crust
Remarks:
Sample plot meets prevalence index and dominance test. Sample plot is located in rock retaining wall.
SOIL Sampling Point:SP 4.9R-U
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-18 10YR4/3 100 Loamy Sand
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes No X
Remarks:
No hydric soil indicators are present in sample plot.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes No X
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
No wetland hydrology indicators are present in the sample plot.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Renton/King Sampling Date:6/23/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 4.9R-W
Investigators:Dalzell/Ivison-Lane Section, Township, Range:SEC 8 / T.23N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):25
Subregion (LRR):A Lat:47.496265 Long:-122.193581 Datum:WGS84
Soil Map Unit Name:Urban land NWI Classification:PEM1
Are climatic / hydrologic conditions on the site typical for this time of year?Yes No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes X No Is the Sampled Area
Wetland Hydrology Present?Yes X No within a Wetland?Yes X No
Remarks:
All 3 criteria are present; therefore the sample plot is within a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:1 (A)
2.Total Number of Dominant
3.Species Across All Strata:1 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species 100 x2=200
4.FAC species x3=0
5.FACU species x4=0
= Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:100 (A)200 (B)
1.Phalaris arundinacea 98 Yes FACW
2.Equisetum telmateia 2 No FACW Prevalence Index = B/A=2.00
3.Hydrophytic Vegetation Indicators:
4.1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.X 3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
100 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test and prevalence index.
SOIL Sampling Point:SP 4.9R-W
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-6 10YR3/1 100 Sandy Loam
6-18 2.5YR4/2 90 10YR4/6 10 C M Loamy Sand Gravely
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)X Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes X No
Remarks:
Hydric soil indicators present for S5.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
X Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
X High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
X Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes X No Depth (inches):1.00
Water Table Present? Yes X No Depth (inches):2.0
Saturation Present?Yes X No Depth (inches):0.0 Wetland Hydrology Present?Yes X No
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
Surface water is present approximately 3' west of the soil pit. Sample plot meets wetland hydrology indicators A1,A2,A3.
WETLAND DETERMINATION DATA FORM - Western Mountains, Valleys, and Coast Region
Project/Site:I-405 Renton to Bellevue City/County:Renton / King Sampling Date:6/22/2016
Applicant/Owner:WSDOT State:WA Sampling Point:SP 5.0R-U
Investigators:Dalzell / Ivison-lane Section, Township, Range:SEC 8 / T.23N / R.05E
Landform (hillslope, terrace, etc.):Hillslope Local Relief (concave, convex, none):None Slope(%):25
Subregion (LRR):A Lat:47.497631 Long:-122.194252 Datum:WGS84
Soil Map Unit Name:Urban Land NWI Classification:Upland
Are climatic / hydrologic conditions on the site typical for this time of year?Yes X No (If No, explain in Remarks)
Are Vegetation:Soil or Hydrology significantly disturbed?Are "Normal Circumstances" present?Yes X No
Are Vegetation:Soil or Hydrology naturally problematic?(If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach a site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present?Yes X No
Hydric Soil Present?Yes No X Is the Sampled Area
Wetland Hydrology Present?Yes No X within a Wetland?Yes No X
Remarks:
2 out of 3 criteria are absent; therefore, this sample plot is not in a wetland.
VEGETATION – Use scientific names of plants.
Absolute Dominant Indicator Dominance Test Worksheet:
Tree Statum (Plot size: )% Cover Species?Status Number of Dominant Species
1.That Are OBL, FACW, or FAC:2 (A)
2.Total Number of Dominant
3.Species Across All Strata:2 (B)
4.Percent of Dominant Species
= Total Cover That Are OBL, FACW, or FAC:100.00 (A/B)
Sapling/Shrub Stratum (Plot size: )Prevalence Index worksheet:
1.Rubus armeniacus 3 Yes FAC Total % Cover of:Multiply by:
2.OBL species x1=
3.FACW species x2=0
4.FAC species 83 x3=249
5.FACU species 7 x4=28
3 = Total Cover UPL species x5=0
Herb Stratum (Plot size: )Column Totals:90 (A)277 (B)
1.Schedonorus arundinaceus 70 Yes FAC
2.Agrostis stolonifera 10 No FAC Prevalence Index = B/A=3.08
3.Galium aparine 5 No FACU Hydrophytic Vegetation Indicators:
4.Hypochaeris radicata 2 No FACU 1 - Rapid Test for Hydrophytic Vegetation
5.X 2 - Dominance Test is >50%
6.3 - Prevalence Index is ≤3.0¹
7.4 - Morphological Adaptations¹ (Provide
supporting8.data in Remarks or on a separate sheet)
9.5 - Wetland Non-Vascular Plants¹
10.Problematic Hydrophytic Vegetation¹ (Explain)
11.¹Indicators of hydric soil and wetland hydrology
87 = Total Cover must be present, unless disturbed or problematic.
Woody Vine Stratum (Plot size: )
1.Hydrophytic
2.Vegetation Yes X No
= Total Cover Present?
% Bare Ground in Herb Stratum % Cover of Biotic Crust
Remarks:
Sample plot meets dominance test.
SOIL Sampling Point:SP 5.0R-U
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches)Color (moist)%Color (moist)%Type¹Loc²Texture Remarks
0-12 10YR4/2 100 Silt Loam
12-14 2.5Y4/4 100 Silt Loam
¹Type: C= Concentration, D= Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ²Location: PL=Pore Lining, M=Matrix.
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils³:
Histosol (A1)Sandy Redox (S5)2 cm Muck (A10)
Histic Epipedon (A2)Stripped Matrix (S6)Red Parent Material (TF2)
Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRLA 1)Very Shallow Dark Surface (TF12)
Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2)Other (Explain in Remarks)
Depleted Below Dark Surface (A11)Depleted Matrix (F3)
Thick Dark Surface (A12)Redox Dark Surface (F6)³Indicators of hydrophytic vegetation and
Sandy Mucky Mineral (S1)Depleted Dark Surface (F7) wetland hydrology must be present,
Sandy Gleyed Matrix (S4)Redox Depressions (F8) unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches):Hydric Soil Present?Yes No X
Remarks:
No hydric soil indicators in sample plot.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)Secondary Indicators (2 or more required)
Surface Water (A1)Water-Stained Leaves (B9) (except Water Stained Leaves (B9) (MRLA 1, 2,
High Water Tables (A2) MRLA 1, 2, 4A, and 4B) 4A, and 4B)
Saturation (A3)Salt Crust (B11)Drainage Patterns (B10)
Water Marks (B1) Aquatic Invertebrates (B13)Dry-Season Water Table (C2)
Sediment Deposits (B2) Hydrogen Sulfide Odor (C1)Saturation Visible on Aeriel Imagery (C9)
Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2)
Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3)
Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5)
Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A)
Inundation Visible on Aeriel Imagery (B Other (Explain in Remarks)Frost-Heave Hummocks (D7)
Sparsley Vegetated Concave Surface (B8)
Field Observations:
Surface Water Present? Yes No X Depth (inches):
Water Table Present? Yes No X Depth (inches):
Saturation Present?Yes No X Depth (inches):Wetland Hydrology Present?Yes No X
(includes capillary fringe)
Describe Recorded Date (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks:
No wetland hydrology indicators in sample plot.