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2101 Fourth Avenue, Suite 600 TE roe No.
Seattle,Washington 98121-2375 TT NN Y� File NO 5 ^
JUL 2 19 a� ivy
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TO �• ` ury N /��111�1iilD/l�w t4Vt W(
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Wetland Delineation Report
City of Renton
' SW 23rd Street Drainage Improvements
1
1
' Prepared for:
t City of Renton
Surface Water Utility
200 Mill Avenue South
Renton, WA 98055
Prepared by:
Ewa
LLQA
rJones & Stokes Associates, Inc.
2820 Northup Way, Suite 100
Bellevue, Washington 98004-1419
425/822-1077
In association with:
R.W. Beck
' 1001 Fourth Avenue, Suite 2500
Seattle, WA 98154-1004
December 15, 1997
t
1
1
' Wetland Delineation Report
City of Renton
' SW 23rd Street Drainage Improvements
1
' Prepared for:
City of Renton
Surface Water Utility
200 Mill Avenue South
Renton,WA 98055
' Prepared by:
ffra
Jones&Stokes Associates,Inc.
2820 Northup Way,Suite 100
' Bellevue,Washington 98004-1419
425/822-1077
In association with:
R.W.Beck
' 1001 Fourth Avenue,Suite 2500
Seattle,WA 98154-1004
December 15, 1997
Table of Contents
Page
Wetland Delineation Report
' City of Renton
SW 23rd Street Flood and Drainage Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
' Project Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Project Description 2
Summary of Site Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
' Results of Wetland Delineation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Wetland W-7S 6
WetlandW-8N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
' Wetland W-ION . . . . . . . . . . . . . . . . . . . . . . . . . 7
. . . . . . . . . . . . . . . . . . . . . . . . .
Functions and Values of Wetlands within Project Site 8
Project Impacts and Measures to Reduce Wetland Impacts . . . . . . . . . . . . . . . . . . . . . 9
' Citations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1
1
1
' BE15/97u LANDS i
11/13/97u
List of Tables and Figures
1
Follows Page
Table
1 Summary of Site Conditions of Wetlands W-7S, W-8N, and W-ION at the SW '
23rd Street and Lind Avenue Drainage and Restoration Project Site . . . . . . . . . . . 5
1
Figure
1 Project Area Map -Renton SW 23rd Drainage Improvements . . . . . . . . . . . . . . . . 1 '
2 Wetlands within the City of Renton East Side Green River Watershed . . . . . . . . . . 1 '
3 Location of Proposed Project Elements along the SW 23rd Street Channel . . . . . . 2
4 Plan View Box Culvert SW 23rd Street Drainage Improvements . . . . . . . . . . . . . . 2
5 Longitudinal Section of 10-Foot by 4-Foot Box Culvert West of Lind Avenue . . . 2 '
6 Plan View of 24-Inch Culvert at the SW 23rd Street Channel East of Lind
Avenue . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 '
7 Longitudinal Section of 24-Inch Culvert East of Lind Avenue . . . . . . . . . . . . . . . . 4
1
1
BECK/WETLANDS Ivi 11
es I
Wetland Delineation Report
' City of Renton
SW 23rd Street Flood and Drainage Improvements
' Introduction
' This report presents the results of a wetland delineation conducted May 23, 1997 for the City
of Renton's SW 23rd Street flood and drainage improvement project. Wetland delineations were
conducted within the areas where construction will occur and where structures will be placed for
' drainage improvements. The wetland delineation was conducted using the U.S. Army Corps of
Engineers Wetland Delineation Manual (Environmental Laboratory 1987). This method is
summarized in Appendix A.
' This report has been prepared for the City of Renton Public Works Department and is
intended to be used for the following purposes:
' • U.S. Army Corps of Engineers review of the project. The Corps is the federal agency
that regulates the discharge of dredge and fill material into wetlands and Waters of the
' United States. This report will be submitted to the Corps for verification of the
delineation and as part of the Joint Aquatic Resource Permit Application.
' • City of Renton Planning Department review of the project as part of the SEPA process
and for compliance with the City of Renton's wetland regulations as stated in the City's
' sensitive areas ordinance.
This report is a stand alone document and presents project description, results of the
' delineation, functions and values of the portion of wetlands within the project area, project impacts,
and methods used for the delineation.
' The wetland delineation was based on best professional standards using accepted field
methods. Final verification of jurisdictional wetland boundaries, however, is the responsibility of the
Corps.
Project Location
' The project site is located at the intersection of SW 23rd Street and Lind Avenue in Renton,
Washington (Figures 1 and 2). Proposed activities would occur along the channel south of
' BECKAVEMANDS
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To Seattle Black River
Pump Station
To Bellevue
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Renton
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Project Site: _I i i 1
NW 1/4, S30, T23N, R5E
SW 1/4, S19, T23N, R5E i I
LAT. 47' 27' 30" i— 1 Applicant: City of Renton
LON. 122' 12' 45" I ' Public Works '
7153-001
06/13/97
Figure 1 . Project Area Map — Renton SW 23rd Street Drainage Improvements ,
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Applicant: City of Renton , --W-sz
' Public Works
Project: Renton SW 23 rd Street a W-50
Drainage Improvements --- „a s ,,s,
7153-001
06/13/97
' Figure 2. Wetlands Within the City of Renton East Side Green River Watershed
SW 23rd Street between Springbrook Creek and East Valle Road, and in a ditch north of ,
Y
SW 23rd Street channel and immediately east of Lind Avenue. '
Project Description ,
The general purpose of the proposed project is to maintain and improve the existing flood
control and drainage systems along SW 23rd Street at Lind Avenue in Renton, Washington. The ,
existing system is not functioning to provide adequate flood control as existing culverts are
undersized or plugged, and existing channels have become reduced in capacity and flow capability
with sediment or vegetation. '
The objectives of the proposed project are to:
• restore drainage to the channel north of SW 23rd Street and correct flooding of the
property north of the SW 23rd Street access road and east of Lind Avenue;
• improve surface water conveyance from the SW 23rd Street channel into Springbrook
Creek;
• reduce maintenance problems associated with the undersized culvert under the Olympic '
Pipeline Crossing and increasing the flood protection to Lind Avenue, East Valley Road,
and other tributary areas; ,
• improve the potential for fish passage from Springbrook Creek to the SW 23rd Street
channel, add habitat for fish that is currently not accessible, and provide off-channel '
habitat during high Springbrook Creek flows.
The proposed activity consists of the 5 elements described below. The project would occur '
in existing channels along SW 23rd Street near Lind Avenue (see Figure 3).
(1) Replace the existing 18 inch culverts under the Olympic Pipeline crossing of the '
SW 23rd Street channel with a new, large pre-cast concrete box culvert.
The Olympic Pipeline Company petroleum product lines are located west of Lind Avenue. '
The pipelines are located in an upland berm separating the pool at the downstream outlet of the twin
9-by 14-foot culverts from the SW 23rd Street Channel. The existing 18-inch culverts connecting '
these two wetland areas are currently undersized and cause high upstream water surface elevations,
contributing to the flooding problems along East Valley Road. The culverts are also subject to
frequent plugging, allowing sedimentation and vegetation debris to fill in and choke the upstream '
channel.
The inside dimensions of the new box culvert will be 10 feet wide, 4 feet high and 80 feet '
long. The new box culvert is designed for the pipelines to remain in their existing location (see
Figures 4 and 5). Invert elevation of the box culvert inlet would be 6.6 feet (NAVD)to tie into the
existing SW 23rd Street channel;invert elevation of the outlet would be 6.5 feet (NAVD). A channel '
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o (PARCEL #3023059084)
Applicant: City of Renton
Date: 12-15-97
Scale: 1"=30'
' Y Datum: NAVD88
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Project Name: City of Renton SW 23rd Street Drainage Improvements i
Figure 4, Plan View Box Culvert S.W. 23rd Street, West of Lind Avenue S.W.
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Applicant: City of Renton
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Date: 12-15-97
Scale: 1"=20'
Datum: NAVD88
Project Name: City of Renton SW 23rd Street Drainage Improvements
Figure 5, Longitudinal section of 10 x 4' box culvert west of Lind Avenue.
approximately 10 feet lop with 1.5:1 side slopes would be excavated in the upland area to connect ,
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the box culvert outlet with the existing SW 23rd Street channel. The inlet and outlet of the box
culvert would be rock-lined to maintain the structural integrity of the culvert to channel connection.
The remaining portions of the 1.5:1 side slopes of the channel would be revegetated with native low
growing wetland shrubs. ,
(2) Remove the abandoned beaver dam at the mouth of the SW 23rd Street channel
as it enters Springbrook Creek west of Lind Avenue and south of the SW 23rd
Street access road and selectively remove debris and vegetation between
Springbrook Creek and Lind Avenue.
The abandoned beaver dam would be removed to reduce debris accumulation and upstream '
sedimentation problems, reduce flood impacts, improve the potential passage of fish from
Springbrook Creek into the SW 23rd Street Channel, and provide habitat during high Springbrook
Creek flows. See Figure 3 for the location of the abandoned beaver dam. The beaver dam is
approximately 6 feet wide and 16" inches high within the ordinary high water mark of the channel and
consists of small, loose mix of willow twigs. '
Debris and shrub vegetation within and four feet above the level of the ordinary high water
mark in the ditch between Springbrook Creek and Lind Avenue would be selectively removed. Hand
held equipment would be used to cut vegetation above ground to avoid disturbance to the ground
surface and minimize impacts to the overhanging shrub canopy outside of the clearing limits.
Overhanging canopy from larger willows that does not obstruct channel flow would not be removed ,
to maintain a shaded canopy over the channel.
(3) Remove accumulated herbaceous and shrub vegetation along 1,180 linear feet
of the SW 23rd Street channel from East Valley Road to Lind Avenue.
Removal of the vegetation is a periodic maintenance activity that would be done to restore
a defined flow channel and help maintain positive drainage. Approximately 8,000 square feet of
vegetation within the wetland (channel and the channel's north bank) would be removed. Young '
shrub vegetation would be removed in the upland area and a narrow strip of wetland along the
channel's north bank; emergent vegetation would be removed within the wetland in the channel.
The existing SW 23rd Street channel along this reach is a V-shaped channel and varies in ,
width from 10 to 25 feet at the elevation of the adjacent wetland area. Its depth below the ground
surface of the wetland to the south, varies from approximately 2 to 5 feet. The surface of the '
adjacent private road is approximately 7 to 12 feet higher in elevation than the bottom of the channel.
Vegetation removal along the south bank would be cut just above the ground surface. Reed
canarygrass (Phalaris arundinacea), black cottonwood (Populus trichocarpa) saplings, and
Himalayan blackberry (Rubus discolor) would be the dominant vegetation to be removed. Other
wetland shrubs such as Douglas' spirea(Spiraea douglasii), red-osier dogwood (Corpus stolonifera), '
and willow (Salix sp.) would also be cut. Vegetation would be cut from the edge of the SW 23rd
Street road surface,the upland portion of the banks, to the water surface. Because of the steep north
channel bank(2:1), a narrow strip of shrub vegetation within the wetland area on the north channel ,
BECK/WULANDS 3
17JI3✓97u '
1
bank would be cut (approximately 2 feet wide). In addition, in those areas where emergent
vegetation is growing in the channel, the above ground portion of the vegetation would be removed
' by scraping the vegetation at the ground surface from the channel with a backhoe. No widening or
deepening of the channel or soil disturbance is intended from this maintenance activity. The backhoe
' would operate from the SW 23rd Street access road.
(4) Install a new 24-inch culvert parallel to and east of Lind Avenue to connect a
small channel north of the SW 23rd Street access road to the SW 23rd Street
channel, south of the access road to restore drainage system function.
' Because of the existing non-functioning 30-inch culvert that crosses Lind Avenue north of the
SW 23rd Street channel, a new culvert would be installed to route flow from the small channel
located north of SW 23rd Street and east of Lind Avenue to the SW 23rd Street channel.
' Development of the property north of the channel and west of Lind Avenue plugged the existing
culvert approximately 10 years ago. Because this channel currently has no drainage outlet along Lind
Avenue or SW 23rd Street, surface water no longer drains but collects in the channel and has created
' wetland conditions and flooding problems on the property north of SW 23rd Street and east of Lind
Avenue. Installation of a new culvert would maintain the drainage system that was in place before
the culvert was plugged.
' The new culvert would be a 24-inch diameter culvert with the inlet located just east of the
existing 30-inch non-functioning culvert's inlet. The invert elevation of the north end of the new
culvert, 12.0 feet (NAVD), is equal to the existing non-functioning culvert. The invert elevation of
the south end of the new culvert would be 8.2 feet (NAVD), which is approximately 1.7 feet higher
than the invert elevation of the existing 9-foot by 14-foot culverts under Lind Avenue south of SW
' 23rd Street. Riprap would be placed at the culvert's outlet to dissipate stormwater runoff entering
into the SW 23rd Street channel. See Figures 6 and 7 for the plan and profile alignment design of the
' new culvert.
(5) Remove sediment from the twin 9-foot by 14-foot culverts under Lind Avenue
' at SW 23rd Street and immediately upstream and downstream of the culvert
openings.
This activity is part of the periodic maintenance required to maintain the positive drainage
along this portion of the SW 23rd Street channel. Approximately 2 to 3 feet of sediment has
accumulated in the SW 23rd Street channel and at both openings of the twin culverts. A backhoe
' and/or vacuum truck positioned on the SW 23rd Street access road would remove this sediment to
the invert elevation of the culverts. The sediment removal would occur within approximately 20 feet
of the culvert opening on the east side of Lind Avenue, and within the pool area on the west side of
' Lind Avenue. Sediment would be disposed on an upland site. (Sediment within the culverts would
be removed using a combination of human assisted shoveling and a vacuum device to bring the
sediment to a truck/storage container on the access road.)
1
' BECK/WETLANDS 4
l2/15J97u
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Applicant: C4iy of Renton
10 Date: 12-15-97
Scale: 1"=30' '
Y Datum: NAVD88i I
Project Name: pity of:Renton SW 23id, Street bra.inage'=fmpiovements''`-�
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Figure 6, Plan view of 24" culvert at the SW 23rd Street channel east of Lind Ave
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' PRORLE PROPOSED 24' CULVERT w W
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SCALE: 7'-20' �9.6
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Applicant: City of Renton
Date: 12-15-97
g Scale: 1"=20'
' Y Datum: NAVD88
Z Project Name: City of Renton SW 23rd Street Drainage Improvements
0
Figure 7, Longitudinal section of 24" culvert east of Lind Avenue.
Summary of Site Conditions '1 e within the project site is urban. Parcels surrounding the project site '
The primary and use p ) g p )
where the work will occur are developed as businesses or undeveloped pads. Wetland areas are
present in many portions of the parcels that have not been filled (see Figure 2). Lind Avenue is a
paved, public road. SW 23rd Street is a paved private access road (east of Lind Avenue) owned by
Olympic Pipeline Company and a gated gravel access road owned by the City of Seattle west of Lind
Avenue. The SW 23rd Street channel is located south of SW 23rd Street and flows east to west. It
crosses under Lind Avenue in twin 9-by 14-foot corrugated metal pipe culverts and discharges into
Springbrook Creek approximately 950 feet west of Lind Avenue. '
Petroleum pipelines owned by Olympic Pipeline Company cross the SW 23rd Street channel
west of Lind Avenue in a north to south direction and are enclosed in an earthen berm. Undersized '
18-inch culverts currently connect the SW 23rd Street channel at this pipeline crossing and are subject
to frequent plugging with debris and sediment.
A separate, smaller channel is located north of the private access roads in SW 23rd Street with
an east to west direction. A 30-inch culvert crossing formerly conveyed flows under Lind Avenue;
however, the culvert was inadvertently plugged and the ditch west of Lind Avenue was filled in the
mid 1980s from the development of the parcel west of Lind Avenue and north of SW 23rd Street.
Water in the channel north of SW 23rd Street and east of Lind Avenue no longer has an outlet
because of the plugged condition of the culvert under Lind Avenue. Lack of a defined ditch west of
Lind Avenue and the steep fill slope from the adjacent parking lot prevent restoring the former
drainage system.
TheW 23rd Street channel lies within two larger wetland areas previously identified in the ,
S g P Y
City of Renton's wetland inventory database. Wetland W-8N occurs east of Lind Avenue and
Wetland W-ION is west of Lind Avenue. The ditch north of SW 23rd Street lies within Wetland '
W-7S. The channels where the proposed activity would occur are considered part of the larger
wetlands because(1) the SW 23rd Street channel is contiguous with wetland W-8N and W-ION on '
the east and west side of Lind Avenue, (2) the channel north of SW 23rd Street is contiguous with
wetland W-7S, and (3) portions of the channel (bank and bottom) are vegetated (although portions
of the proposed activities occur where the channels are unvegetated). Table 1 summarizes the general '
site conditions of Wetlands W-7S, W-8N, and W-ION. The three wetlands are separated by the
private access roads in SW 23rd Street and Lind Avenue.
Results of Wetland Delineation
Previous wetland inventories conducted for the City of Renton have identified the wetlands
W-7S,W-8N, and W-ION(Renton 1996). To determine specific project impact areas on wetlands '
W-7S, W-8N, and W-ION, wetland delineations were conducted within the area of the wetlands
where excavation or filling would occur to place the new culverts. The vegetation, soil, and
hydrologic conditions are described for the portion of the three wetlands where project activity would '
BECKAVETLANDS 5
12/15/97u ,
Table 1. Summary of Site Conditions of Wetlands W-7S,W-8N,and W-ION at the SW 23rd Street
and Lind Avenue Drainage and Restoration Project Site
Wetland Wetland Approximate Size Dominant Soils City of Renton
No. Classification (acre) Species (SCS 1973 Category
W-7S PSS,PEM 1.75` Salix sitchensis,Salix lasiandra, Puget silty clay loam,Snohomish silt 3
Typha latifolia, Cornus stolonifera, loam,Tukwila muck(all considered
Phalaris arundinacea hydric soils)
W-8N PSS,PEM 9.5 Salix sitchensis,Salix lasiandra, Puget silty clay loam,Snohomish silt 2
Typha latifolia, Cornus stolonifera, loam,Tukwila muck(all considered
Phalaris arundinacea,Fraxinus hydric soils by the SCS)
latifolia,Iris pseudacorus
W-ION PFO,PSS,PEM 8.6 Salix sitchensis,Salix lasiandra, Urban,Woodinville silt loam(hydric 2
Typha latifolia, Cornus stolonifera, soil)
Phalaris arundinacea,Populus
trichocar a
Source: East Side Green River Watershed Project Plan and Environmental Impact Statement;Volume II-Appendices
`The area of W-7S was over estimated at 3.3 acres in the City's wetland inventory. An area of 1.75 acres is considered more accurate based on site analysis and aerial
photograph interpretation.
1
occur. Figures 4 and 6 show the wetland boundary in the project area. See Appendix B for wetland '
� �' P J PP
data sheets.
Wetland W-7S
Wetland W-7S is a long linear ditch with a narrow portion of the ditch (5 to 10 feet wide)
containing open water during the time of the delineation. The ditch banks are vegetated with scrub- '
shrub and herbaceous vegetation as discussed below. The west end of Wetland W-7S was delineated
for this project where the non-functioning culvert is located. This portion of the wetland that would
be directly affected by installation of the culvert under SW 23rd Street is a palustrine scrub-shrub '
wetland. The features of this portion of the wetland are described below.
Vegetation. Vegetation is dominated by Sitka willow (Salix sitchensis), red-osier dogwood, '
and reed canarygrass. The vegetation is growing on the banks of the ditch around the standing water
in the ditch at the opening of the non-functioning culvert. Vegetation in the upland surrounding the
wetland area is dominated by Himalayan blackberry, reed canarygrass, and red alder(Alnus rubra). '
Hydrology. Wetland hydrology is supported by surface water runoff from surrounding
upland areas that collects in the ditch. Water depths in the ditch ranged from 12 to 22 inches during '
the time of the delineation. Inundation within the ditch varies from seasonal to perennial depending
upon the amount of yearly precipitation. During the time of the delineation, saturated soils along the
banks and low terraces adjacent to the ditch were associated with the groundwater in the general ,
area. Surface water does not drain into other wetlands or channels because of the plugged condition
of the existing culvert. ,
Soils. Soils in this portion of the wetland were mapped as urban by the Soil Conservation
Service (SCS 1973). Soil characteristics in the upper 10 inches of the vegetated portion of the '
wetland were silt loam texture, matrix colors of IOYR 3/2 with 1 OYR 4/1 and 1 OYR 3/6 mottles, and
sulfidic smells.
Upland soil characteristics were sandy loam texture with a matrix color of 1 OYR 3/3 with very '
few 1 OYR 3/6 mottles. Soils were "dry" as determined by the dusty nature of the soil as it was
removed from the soil pit. '
Wetland W-8N ,
Wetland W-8N is scrub-shrub wetland with the SW 23rd Street channel forming the northern
border of the wetland. The west end of the channel was delineated for this project where the south '
end of the new culvert will be placed under SW 23rd Street and where sediment will be removed
upstream from the existing 9-foot by 14-foot culverts running under Lind Avenue. This portion of
the wetland that would be directly affected by project activities is open water with scattered '
vegetation along the rock-lined banks.
BECKAVEILANDS 6
IVIS/97u '
' Vegetation. Vegetation was not resent in the portion of the wetland affected by the culvert
� g P
installation and sediment removal. A few scattered sedge (Carex sp.) plants, reed canarygrass,
Douglas' spirea, and sitka willows are present at the upper edge of the wetland beyond the project
construction area for the culvert installation and sediment control.
' The SW 23rd Street channel between Lind Avenue and East Valley Road where vegetation
would be removed for channel maintenance is dominated by shrubs such as sitka willow, Pacific
willow(Salix lasiandra), and black cottonwood, along the channel edge. Reed canarygrass, common
' cattail (Typha latifolia), and American brooklime (Veronica americana) are present in portions of
the channel bottom intermixed in the open water. The channel ranges in width from 10 to 25 feet
with some of the shrubs overhanging across the channel.
Vegetation in the upland south of the channel at the western end of the channel was
' dominated either by Himalayan blackberry or red alder and black cottonwood with an understory of
California blackberry (Rubus vitifolius) and stinging nettle (Urtica dioica).
' Hydrology. Surface water drains to the channel from a portion of the valley west of SR-167
and also from the south portion of the Panther Creek Wetland east of State Route 167. Surface water
in the channel eventually discharges into Springbrook Creek approximately 900 feet downstream and
west of the project area.
Surface water depths in the channel ranged from under 12 inches to over 24 inches near the
' opening of the twin 9-foot by 12-foot culverts under Lind Avenue. Surface water was not present
in the adjacent portion of Wetland W-8N southeast of the channel and beyond the limits of the
proposed project activity.
Soils. Soils in this portion of the wetland were mapped as urban by the Soil Conservation
Service (SCS 1973). Soil characteristics in the upper 10 inches of the unvegetated portion of the
' wetland were silt loam texture with high organic content, matrix colors of N 2/0, and sulfidic smells.
' Upland soil characteristics at a depth of 10 inches were loamy sand texture with a matrix color
of 2.5Y 4/3 (see data plot 2). Soils were "dry" as determined by the dusty nature of the soil as it was
removed from the soil pit.
Wetland W-10N
' Wetland W-1ON is scrub-shrub wetland west of Lind Avenue with the SW 23rd Street channel
forming the northern border of the wetland. The east end of the channel was delineated for this
project where the new box culvert and channel will be placed under the Olympic Pipeline Co.'s
pipelines and where sediment will be removed from the downstream end of the twin culverts running
under Lind Avenue.
Two wetland areas were delineated; an emergent wetland immediately downstream of the twin
culverts, and a scrub-shrub wetland associated with the SW 23rd Street Channel west of the Olympic
' B II.ANDS 7tY1997u lS/97u
pipelines. An upland berm exists between the two wetland areas where the pipelines cross the '
channel.
Vegetation. Vegetation in the wetland area where the twin culverts discharge into the ,
g g g
channel is dominated by American brooklime. Some reed canarygrass and scattered Douglas' spirea ,
is found within the ordinary high water line along the steep banks surrounding the pond. Riprap
covers the slopes surrounding the wetland area.
The wetland area immediately west of the Olympic pipeline crossing consists of a scrub-shrub ,
wetland and the continuation of the SW 23rd Street channel. The channel bottom is generally
unvegetated with willows, red-osier dogwood, and Douglas' spirea growing among the rock-lined '
steep banks. The scrub-shrub wetland area adjacent to the channel is dominated by the same species
in the shrub layer with reed canarygrass, sedge, and American brooklime found in the herbaceous
layer. Douglas' hawthorn (Crataegus douglasii), Oregon ash (Fraxinus latifolia), and black '
cottonwood are scattered throughout this edge of Wetland W-ION.
Hydrology. Surface water was present during the time of the delineation within the ponded ,
area at the mouth of the twin culverts and in the SW 23rd Street channel west of the pipeline
crossing. The water source in the channel is a continuation of the drainage along the 23rd Street
channel east of Lind Avenue and local runoff from pipe systems in Lind Avenue. '
Wetland hydrology in the scrub-shrub wetland west of the pipeline crossing and above the
channel elevation was evident from indicators of ponding water(i.e., water-stained leaves and algal '
matting). The elevation of the scrub-shrub wetland is approximately 4 feet above the channel bottom,
but is lower than the berm where the pipelines cross the channel. Seasonal high groundwater is
assumed to be present in the scrub-shrub wetland adjacent to the channel. ,
Soils. Soils in this portion of the wetland were mapped as urban by the Soil Conservation '
Service (SCS 1973). Soil characteristics in the upper 10 inches of the vegetated portion of the
wetland were silt loam texture with a matrix color of lOYR 3/2 with lOYR 3/6 mottles. Sulfidic
smells from the soil in the channel indicated anaerobic conditions were present. '
Upland soil characteristics were observed on the berm at the pipeline crossing and
immediately beyond the wetland edge of Wetland W-1 ON (see plots 2, 3, and 4). Soil characteristics '
at a depth of 10 inches were loamy sand texture with matrix color of 2.5Y 3/3 and 1 OYR 3/3 without
mottles.
Functions and Values of Wetlands within Project Site
t
Functions and values typically associated with wetlands include water quality improvement,
flood storage, groundwater exchange, shoreline erosion protection, habitat functions, and '
cultural/socioeconomic values. Because project activities are proposed in isolated portions of the
wetland systems where rock-lined channel occurs, the primary functions to be affected by the project
are flood storage fish passage. Implementation of the project elements would improve the flood ,
BECK/WEMANDS p
17/IS/97u 8 '
' storage functions b increasing the flood storage volume of the SW 23rd Street channel and removing
g Y g g
restrictions in the system. Removal of the restrictions would also improve fish passage and add fish
' habitat that is currently not accessible. Other habitat functions associated with the channel and
surrounding wetlands would not change as scrub-shrub vegetation types would persist over time.
' Additional scrub-shrub habitat is likely to increase within the channel north of SW 23rd Street and
east of Lind Avenue as discussed below under project element number 4.
' Project Impacts and Measures to Reduce Wetland Impacts
' Cumulative impacts on wetlands from the proposed activities are as follows:
' • permanent fill from placement of the new culverts or riprap at the outlets of the culverts
would be approximately 300 square feet (the majority of the riprap fill would occur in
areas where rock-lined channel banks or unvegetated channel bottoms exist);
' • temporary disturbance from the construction related activities to place the new culverts
would be approximately 250 square feet (temporary disturbance occurs primarily on
' rock-lined banks and unvegetated channel bottoms); and
• temporary disturbance from the removal of accumulated sediment at the inlet and outlet
of the twin culverts would be 1,400 square feet (to a depth of approximately 2.5 feet
would equal 130 cubic yards).
The total impacts on wetlands from improvements to the culvert drainage system would be
1,950 square feet(0.04 acre). In addition, vegetation maintenance along the SW 23rd Street channel
would temporarily remove approximately 8,000 square feet of young shrub and herbaceous plants
from the channel banks and bottom.
' Mitigation measures taken to minimize impacts of the project are as follows:
• avoiding impacts on the higher quality portions of wetlands W-8N, W-ION, and W-7S;
' • minimizing the area of wetland impact by limiting disturbance to primarily those portions
of the channels where rock-lined slopes, unvegetated channel bottoms occur;
• use of bypass flow pipe to maintain base flow in the SW 23rd Street channel during
construction and to route water around the construction areas;
' • placement of strawbales in the downstream portion of SW 23rd Street channel west of
Lind Avenue to contain any sediment that may be transported downstream from the
project activity;
B/1"7u I'LANDS 9
17JI5/97u 7
• revegetating wetland and buffer areas temporarily disturbed by construction with native ,
wetland shrubs (such as the slopes created around the inlet and outlet of the new box
culvert and the inlet of the new 24-inch culvert); and '
• creating approximately 200 square feet of wetland between the outlet of the new box
culvert and the existing SW 23rd Street channel. '
Specific impacts from each of the five project elements are discussed below.
Pi ,
(1) Replace the existing 18 inch culverts under the Olympic Pipeline crossing of the
SW 23rd Street channel with a new pre-cast concrete box culvert. ,
Impacts from the culvert replacement will occur from the construction of the box culvert's
inlet structure within a small portion of the wetland and from construction of the channel connecting '
the new box culvert to the existing SW 23rd Street channel (see Figure 4).
Temporary construction impacts and the installation of the new box culvert are expected to ,
be limited to a cumulative area of approximately 350 square feet of wetland. Downstream
sedimentation issues will be minimized by routing any channel flow that may occur during
construction in a bypass pipe. The area where work will occur will be protected from the rest of the '
channel by sedimentation fences. Work would be scheduled to occur outside of the wet season
during low flows.
Wetland area that will be impacted is primarily rock lined slopes where the new box culvert's
inlet and outlet occur. At the outlet, scrub-shrub vegetation (willow and red-osier dogwood) is
growing at and above the wetland boundary (approximately the ordinary high water line). Several ,
willow and/or red-osier dogwood plants would likely be removed for placement of the new box
culvert. The new channel slopes that are to be constructed connecting the box culvert to the existing
SW 23rd street channel would be revegetated with native low growing shrubs to compensate for the '
vegetation removed to construct the channel. Approximately 200 square feet of wetland and channel
bottom would be created from construction of the new channel. '
No impacts to fish are expected to occur. Fish have not been observed in the channel and
current use would be limited by the downstream beaver dam. The proposed project replaces culverts ,
that are a barrier to fish with a fish passable culvert.
Downstream water quality would be protected during construction by placement of ,
sedimentation fences and rerouting surface flows back into the channel downstream of the
construction area via a bypass pipe. A series of straw bales would be placed in the channel to contain
sediment from the water in the bypass pipe. The bales would be removed after all construction is ,
complete. Sediment would be removed if large enough quantities accumulated behind the bales.
Temporary dewatering of the culvert construction area to allow for construction of the box culvert
and other project elements could result in pumping of turbid water through the bypass system and '
into the SW 23rd Street channel. The straw bales in the channel would trap any sediment before
reaching Springbrook Creek.
BECK/WETLANDS l 0
l4/IS/97u '
' Existing water elevations in Wetland W-8N during storm events are caused by the undersized
culverts under the Olympic Pipeline crossing. Hydraulic modeling of surface water elevations within
' the SW 23rd Street channel indicate that the surface water elevations for a 2 year storm would be
reduced by 2 feet by the culvert replacement. This is not expected to impact wetland acreage
associated with wetland W-8N because (1) surface water connections between the channel and
' wetland W-8N would still occur and surface water would continue to inundate wetland W-8N, (2)
base flow within the channel is not expected to change, and (3) two-year storm overflows into the
wetland are relatively short in duration (less than one day) according to hydrologic/hydraulic
' simulation.
' The decrease in the maximum water levels during storm events is not expected to significantly
change the wetland vegetation. Some herbaceous species may decrease (e.g., cattail and yellow flag)
whereas other species may increase(e.g., sedges and rushes). Willow and spirea are species adapted
' to water level fluctuations and are expected to continue to dominate the wetland.
(2) Remove the abandoned beaver dam at the mouth of the SW 23rd Street channel
' as it enters Springbrook Creek west of Lind Avenue and south of the SW 23rd
Street access road and selectively remove debris and vegetation between
Springbrook Creek and Lind Avenue.
' Removal of the small beaver dam which has deteriorated to a loose assemblage of sticks will
not require any removal of wetland vegetation. No impacts on the channel or associated wetland are
' expected to occur. The beaver dam can be removed with hand held tools and equipment to avoid the
disturbance of surrounding vegetation. Because the dam is loosely held together, base flow within
the channel is not expected to change significantly to affect the surrounding wetland. High
' groundwater and surface flows associated with winter and spring storm events will continue to supply
a source of water to support the scrub-shrub and forested wetland W-1 ON.
' Removal of debris and vegetation along the channel between Springbrook Creek and Lind
Avenue would be done by selectively cutting lower growing vegetation hanging into the channel that
obstructs flow. This activity would not directly impact the wetland or channel because only above
' ground material would be removed. The ground surface and soils would not be disturbed by the
activity. Overhanging canopy from larger willows that does not obstruct channel flows would not
' be removed to maintain a shaded canopy over the channel.
(3) Remove accumulated herbaceous and shrub vegetation along 1,180 linear feet
' of the SW 23rd Street channel from East Valley Road to Lind Avenue.
Vegetation will be cleared along the south bank of the channel and within the channel.
' Vegetation will be cleared by mowing and scraping and would not affect the topography of the
wetland. Although the removal of vegetation would result in the loss of some wildlife habitat, the
amount lost is incremental relative to the amount of surrounding scrub-shrub habitat in wetlands W-
8N,W-7S, and W-lON. Fish passage in the channel will be improved and this reach will be restored
as off-channel habitat for Springbrook Creek after the Olympic Pipeline culvert is replaced (see
Element 1). Emergent vegetation to be removed from the channel include common cattail (Typha
BECK/WETLANDS 11
' 1?ll S/97u
lati olia American brooklime (Veronica americana), reed canarygrass, and yellow flag (Iris '
pseudacorus).
Install a new 24-inch culvert parallel to and east of Lind Avenue to connect a '
(4)
small channel north of the SW 23rd Street access road to the SW 23rd Street ,
channel, south of the access road to restore drainage system function.
Impacts associated with installation of the new culvert would occur from placement of the '
culvert's outlet into the SW 23rd Street channel. Approximately 100 square feet of wetland W-8N
would be disturbed where the culvert daylights into the wetland's channel bank; approximately 100
square feet of wetland W-7S would be temporarily disturbed by construction activities to install the '
culvert at the inlet. Restoring the drainage system function would return the hydrology in the channel
on the north side of the private access road and wetland W-7S to conditions that existed before the
existing culvert was plugged. Re-establishing the drainage from wetland W-7S to wetland W-8N '
could result in the potential loss of approximately 0.5 acre of wetland hydrology in the 1.75 acre
wetland W-7S. Lowering of surface water elevations in the channel portion the wetland could reduce
the amount of surface water or area of saturation in the outer perimeter of the wetland. ,
The wetland area directly affected from installation of the culvert would be in the rock-lined
north bank of the channel and would not result in significant impacts to the wetland as no wetland '
vegetation would be removed. The culvert would be installed during the dry season to further reduce
potential impacts to water quality. If surface water is present in the channel north of SW 23rd Street
occurs during construction, a temporary barrier would be placed to prevent surface flow from the ,
channel to the construction area. Surface flow could then be rerouted downstream of the project area
using a bypass pump system. The system of sedimentation fences and strawbales discussed under
element No. 1 would be in place to reduce sedimentation impacts to the water in the channel. ,
Any wetland area temporarily disturbed from construction activities would be revegetated
with shrubs common to the area. '
Placement of the new culvert would restore the drainage system north of the SW 23rd Street '
access road. Late spring surface water elevations in the channel within wetland W-7S could be
reduced approximately 1.8 feet. (This is based on the difference of existing water elevations in the
wetland and water elevations associated with the proposed project in place.) Although the installation '
of the new culvert would reduce the frequency and depth of inundation during storm events along
the channel, the scrub-shrub vegetation associated with this wetland is not expected to change.
Species such as willow, reed canarygrass, and spirea growing in the wetland, and outside of the ,
channel within the wetland, are tolerant of changes in water levels and are expected to adapt to the
new hydrologic regime. High ground water within 18-24 inches of the surface of the wetland would
continue to support the growth of scrub-shrub vegetation. Additional scrub-shrub vegetation may ,
establish within the channel from the reduced water levels.
(5) Remove sediment from the twin 9-foot by 14-foot culverts under Lind Avenue '
at SW 23rd Street and immediately upstream and downstream of the culvert
openings.
aECKMM ANDS 12
17/IS/97u ,
Sediment that supports approximately 970 square feet (0.02 acre) of emergent vegetation
(American brooklime)would be removed from the pool downstream of the culvert openings. Wetland
' vegetation would not be affected in the area upstream of the culverts; sediment would be removed
from an unvegetated area of approximately 590 square feet upstream of the culverts within the
wetland. Wetland vegetation would not be affected in this small area where plants have not yet
established. Protection of water quality downstream of the sediment removal area would be
accomplished by working during low flows and bypassing the flows around the work area. Sediment
' samples will be taken before construction to evaluate sediment quality and disposal requirements.
Straw bales placed in the channel would be in place to trap sediment and soil pollutants before
reaching Springbrook Creek.
Citations
Environmental Laboratory. 1987. U.S. Army Corps of Engineers wetland delineation manual.
' (Technical Report 4-87-1). U.S. Army Corps of Engineers Waterways Experiment Station.
Vicksburg, MS.
' U.S. Soil Conservation Service. 1973. Soil Survey of King County Area, Washington. U.S.
Department of Agriculture. Washington, DC.
' Reed. P.B., Jr. 1988. National list of plant species that occur in wetlands: northwest (Region 9).
St. Petersburg, FL. Prepared for U.S. Fish and Wildlife Service wetland inventory, Washington,
DC.
' Renton. 1996. East side Green River watershed project plan and environmental impact statement.
Prepared by R.W. Beck for the City of Renton. Seattle, WA.
' BECK/WETLANDS 13
17/15/97u
' Appendix A
1 Summary of the 1987 Corps of Engineers
Wetland Delineation Methodology
Appendix A. Summary of the 1987 Corps of Engineers
Wetland Delineation Methodology
' INTRODUCTION
' Wetlands at the site were delineated using the methodology described in the U.S. Army Corps
of Engineers Wetlands Delineation Manual (Environmental Laboratory 1987). The 1987 manual is
' applied by the U.S. Army Corps of Engineers and the U.S. Forest Service, Region Six, Watershed
Assessment Methodology. For regulatory purposes, the federal agencies define wetlands as follows:
' Those areas that are inundated or saturated by surface or groundwater at a
frequency and duration sufficient to support, and that under normal circumstances
do support, a prevalence of vegetation typically adapted for life in saturated soil
' conditions Wetlands generally include swamps, marshes, hogs, and similar areas.
The methodology for wetland delineation requires examination of three wetland parameters:
' vegetation, hydrology, and soils. For an area to be considered a wetland, a positive indicator for all
three of these parameters must be present.
HYDROPHYTIC VEGETATION
Hydrophytic plants are those plants adapted to life in water, soil, or on a substrate that at least
' periodically lacks oxygen. Commonly occurring plant species have been assigned a plant indicator
status by the U.S. Fish and Wildlife Service based on their frequency of occurrence in wetlands. Plant
indicator status categories are described in Table 1.
For a vegetation community to be considered hydrophytic, 50% or more of the dominant
species in that area are typically rated as facultative or wetter. In the case where half of the dominant
' species are hydrophytic and half are nonhydrophytic(upland), the determination is made based on the
total percent areal coverage of each of the two groups. For example, if more than 50% of the total
areal coverage is composed of hydrophytic plants, the community is determined to be hydrophytic.
' BECK/WETLANDS A-1
tV�/1997cISJ97e
Table 1. Plant Species Wetland Indicator Categories
Estimated
Indicator Probability in
Category Occurrence Wetland
OBL Obligate. Occur almost always under natural conditions in wetlands. >99% '
FACW Facultative wetland. Usually occur in wetlands,but occasionally found 67-99%
in nonwetlands.
FAC Facultative. Equally likely to occur in wetlands or nonwetlands. 34-66% '
FACU Facultative upland. Usually occur in nonwetlands,but occasionally 1-33%
found in wetlands. ,
UPI, Upland. May occur in wetlands in another region,but occur almost <1%
always under natural conditions in nonwetlands in this region(Region
Source: Reed 1988. ,
WETLAND HYDROLOGY '
Areas possessing wetland hydrology are inundated either permanently or periodically, or the '
soil is saturated to within 1 foot of the surface for at least 5%, and generally greater than or equal to
12.5%, during the growing season. Direct observations of hydrology, including ponding and soil
saturation, may be limited during the dry season or may be misleading during the winter rainy season.
However, indicators may be present throughout the year which confirm the presence of wetland
hydrology during the growing season. Indicators include water-stained leaves, watermarks, drainage
patterns, drift lines, visible sediment deposits, and exposed mud. '
HYDRIC SOILS '
Hydric(wetland) soils are defined as those soils which are saturated, flooded, or ponded long ,
enough during the growing season to develop anaerobic conditions that favor the growth and
regeneration of hydrophytic(wetland)vegetation. Hydric indicators include low soil chroma, mottles,
gleying, high organic content, and sulfidic materials: '
BECK/WE-ri ANDS A-2
17/1J✓9'le
• Chroma is a measure of the intensity of grayness of the soil color. A chroma of 1,
occurring with or without mottles, or a chroma of 2, occurring with mottles, is
considered to be low and an indicator of hydric soils.
• Mottles are spots or blotches of contrasting color occurring within the soil matrix.
' • predominantlyneutral ra in color.
Gleyed soils are gray
' • Soils are considered to be organic if at least 18 inches of the upper part of the soil profile
contains organic material, or if the soil consists of organic material resting on bedrock.
' • Sulfidic materials result when mineral soils are waterlogged. Over time, a reducing
environment develops in the soil, producing materials that emit a sulfidic odor.
Soils at the Lind Avenue site were sampled with shovels and examined for hydric indicators.
Soil pits were dug to a depth of approximately 20 inches to obtain soil profile information. Observed
soil characteristics were compared to the U.S. Soil Conservation Service (SCS) descriptions of
mapped soils(SCS 1973)to either confirm the mapping or determine if an inclusion is present. Most
soils mapped by the SCS include areas of other soils (inclusions)which may compose from 2 to 50%
of that unit.
WETLAND BOUNDARY DETERMINATION
An overall assessment was made of the site. Plots were sampled and evaluated for the three
wetland criteria(vegetation, hydrology, and soils). A wetland or upland determination was made for
each plot. Sample plot data were recorded on data sheets and are included in Appendix B.
Wetland boundaries were determined based on plot determinations and visual observation of
site characteristics. Wetlands were delineated in the field and marked on color aerial photographs.
Impacted wetlands were marked with orange and black striped flagging affixed to vegetation at a
height of 4 to 6 feet at 25-foot intervals. In areas where there was insufficient vegetation from which
to hang flagging, orange-flagged wire stakes were used to identify the wetland boundary. The
flagged wetland edge was surveyed by R.W. Beck and Jones& Stokes Associates.
Wetlands were delineated by Mark Matthies, certified by the Seattle Corps Wetland
Delineation Certification Program.
' BECNos A-3
Iv15/9'le
' Appendix B
Routine Wetland Determination Forms
' DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE Wetlands Delineation Manual)
Project/Site: IN 2 P-4 5T LINO AV5. CvLvZ1zT AZ164}c'T Date: J 2- 'p7
Applicant/Owner: Cr e K ov. 6(rc or(G County:
' investigator: State: GdH
Do Normal Circumstances exist on the site? (Ygir No Community ID: W-7 S
Is the site significantly disturbed (Atypical Situation)? Yes cfTb Transect ID:
1 is the area a potential Problem Area? Yes 1!§1 Plot ID: /
(If needed, explain on reverse.) L/
' VEGETATION
m
Dominant Plant Species Stratum Indicator Daw�r— Plant Species Stratum Indicator
7.�/ S.
Ytl�!< YiS grurw�%tiaCtae 14 ��� 9. SPi'ykEA d00S1a46�
2.SGI,x s�'t//cltc�s�s s 64- lo.
3.CbI�nuS s'To�otli �✓a. S Fr4GkJ 11.
' 4. . . 12.
5. 13.
6, 14. '
7. 15.
S.
Percent of Dominant Species that are OBL. FACW or FAC r
(excluding FAC-). / �a
Remarks: A /)I� 1� (M. ��^ �i" �t�1 t lam( J~ ,
HYDROLOGY
' —Recorded Data (Describe in Remarks): Wetland Hydrology Indicators:
_Stream, Lake, or Tide Gauge Primary Indicators:
_Aerial Photographs Inundated
— _Other �Saturated in Upper 12 Inches
No Recorded Data Available Water Marks
_Drift Lines
_Sediment Deposits
' Reid Observations: — _Drainage Pattems in Wetlands
Secondary Indicators (2 or more required):
Depth of Surface Water- (in.) —Oxidized Root Channels in Upper 12 Inches
—Water-Stained Leaves
' Depth to Free Water in Pit: (in.) =Local Soil Survey Data
FAC-Neutral Test
Depth to Saturated Soil: _(in.) _Other (Explain in Remarks)
' Remarks: IAI� e✓In� dr7Gfn �� G!��(�t,j'- Y�Gt I Z Z„ /4' U
meat V dj rG�, — 41.0 10urte /,tni f-tc 4 end A
SOILS ,
Map Unit Name
(Series and Phase): U 9E34t / Drainage Class:
Field Observations
Taxonomy(Subgroup): Cocfirm Mapped Type? Yes No
Profile Description: '
Depth Matrix Color Mottle Colors Mor.:e Texture, Concretions,
finches)_ Hcrizon (Munsell Moist) (Munsell Moist) Abundance/Co-mast Structure, etc. _
b- ►v le y� �� Dom,, 3�� c vr�M ov ,a-�/I ■
Hydric Soil Indicators:
=Histosol _Concretions '
Histic Epipedon _High Organic Content in Surface Layer in Sandy Soils
_Sulfidic Odor _Organic Streaking in Sandy Soils
Aquic Moisture Regime _Listed on Local Hydric Soils List
Reducing Conditions _Listed on National Hydric Soils List
Gleyed or Low-Chroma Colors _Other(Explain in Remarks)
Remarks: �^� /t�iCa
WETLAND DETERMINATION
Hydrophy is Vegetation Present? a No (Circle) (Circle) '
Wetland Hydrology Present? No
Hydric Soils Present? a No Is this Sampling Point Within a Wetland? No
Remarks: '
P S✓ l,���L�� Ccc,c� �-rr��� �/ !i 1�fc r �'tc�..
Approved—by—H-CIUS AC 3/92
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE Wetlands Delineation Manual)
' Project/Site: W 2 5T GlND /4vF-. CvcvZn'r RFFchc T Date: ,_ '2-3 ' 7
Applicant/Owner: G eK or U- or(Ka County:
Investigator: State: Gt/H
' Do Normal Circumstances exist on the site? �g No Community ID: W -7 S
Is the site significantly disturbed (Atypical Situation)? Yes d4b Transect ID:
' Is the area a potential Problem Area? Yes Plot ID: 2-
(if needed, explain on reverse.)
VEGETATION
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
1. PL)b')6 a%dcolo✓ -C F/3C14- 9. s
2. P/l�a I a ✓u In of i eNA C ._� F/`�`'�^� 10.
4, 12.
S. 13.
14.
7.S. 16.
Percent of Dominant Species that are 06L. FACW or FAC
(excluding FAC-).
' Remarks: IlApv ,ty ` , ^' PI fA/Z—
HYDROLOGY
Recorded Data (Describe in Remarks): Wetland Hydrology Indicators:
_Stream, Lake, or Tide Gauge Primary Indicators:
_Aerial Photographs _Inundated
— _Other —Saturated in Upper 12 Inches
No Recorded Data Available Water Marks
—Drift Lines
_Sediment Deposits
' Field Observations-_ _Drainage Patterns in Wetlands
Secondary Indicators (2 or more required):
Depth of Surface Water: Gn.) —Oxidized Root Channels in Upper 1 2 Inchon
Water-Stained Leaves
' Depth to Free Water in Pit: 7//,-—(in.) _Local Soil Survey Data
FAC-Neutral Test
Depth to Saturated Soil: 7l� (in.) —Other (Explain in Remarks)
' Remarks: 14- s_Ai
SOILS '
Map Unit Nama U I t' ,
(Series and Phase): R B A[ + Drainage Class:
Feld Observations
Taxonomy(Subgroup): _ Confirm Mapped Type? No
Profile Deseriotion: '
Depth Matrix Color Mottle Colors Monte. Texture, Concretions,
inches) Hcrizon (Munsell Moist) (Munsell Moist) Abundance/Co-mast Structure, etc.
Hydric Soil Indicators:
_Histosol _Concretions '
_Histic Epipedon _High Organic Content in Surface Layer in Sandy Soils
_Sulfidic Odor _Organic Streaking in Sandy Soils
Aquic Moisture Regime _Listed on Local Hydric Soils List
-Reducing Conditions _Listed on National Hydric Soils List ,
Gleyed or Low-Chroma Colors _Other.(Explain in Remarks)
Remarks:
�L17 �IiYCIN� '
1
WETLAND DETERMINATION
Hydrophytic Vegetation Present? Yes (Circle) (Circle) '
Wotland Hydrology Present? Yes
Hydric Soils Present? Yes Is this Sampling Point Within e Wetland? Yes
00
Remarks: U f/��! (le ! ,,f/!G� ���F p sSE r✓raQ
�� - f�, 1, �y 7 '
Approved by H U AC 3/92
1
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE Wetlands Delineation Manual)
Project/Site: U/ 23 ST -- LINO /4v):. 6 T � ,r,04,4E T Date: J- �3 -p 7
v�vtn
Applicant/Owner: G Of EeK evl or(c., 4a,t County:
Investigator: M , Iq- - ly< C3 State: Gdq
' Do Normal Circumstances exist on the site? (YVs- No Community ID:
Is the site significantly disturbed (Atypical Situation)? Yes cf�b Transect ID:
Is the area a potential Problem Area? Yes I Plot ID: l
(If needed, explain on reverse.) -lf�
' VEGETATION
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
3_ ?/Iu � V1 l'4 6 l '� JCS FACIA. 11.
4. ('V��iut� a✓v +'uRcrae 1s FgGLJ 12.
5. V r�i G 4 /C<d i C.� _ 13.
' 6. 14.
7. 15.
8. 16. _
Percent of Dominant Species that are OHL,FACW or FAC D -
(excluding FAC-). Q �°
' Remarks:
HYDROLOGY
_Recorded Data (Describe in Remarks): Wetland Hydrology Indicators:
—Stream, Lake, or Tide Gauge Primary Indicators:
_Aerial Photographs Inundated
Other —Saturated in Upper 12 Inches
No Recorded Data Available Water Marks
_Drift Lines
_Sediment Deposits
' Reid Observations: _Drainage Pattems in Wetlands
Secondary Indicators (2 or more required):
Depth of Surface Water: (n.) _Oxidized Root Channels in Upper 12 Inches
-Water-Stained Leaves
' Depth to Free Water in Pit: 3( (in.) —Local Soil Survey Data
FAC-Neutral Test
Depth to Saturated Soil: 3 (o (in.) —Other (Explain in Remarks)
Remarks.^ f,tj ���G� Gt O'�^ T Wlltff�t = ' GtlpotJe L .�J C.60
we, ,,6 Sv�r�nd,
SOILS '
Map Unit Name
(Series and Phase): U Drainage Class:
Field Observations
Taxonomy (Subgroup)- Corfir.n Mapped Type? Yes No
Profile Description: '
Depth Matrix Color Mottle Colors Monza Texture, Concretions,
Cinches) Hcrizon (Munsell Moist) (Munsell Moist) Abundance/Co-mast Structure, etc.
b - /U �/z Y7- - .-- A'
�-
Hydric Soil Indicators:
_Histoso! _Concretions '
Histic Epipedon _High Organic Content in Surface Layer in Sandy Soils
_
Sulfidic Odor _Organic Streaking in Sandy Soils
_
—Aquic Moisture Regime _Listed on Local Hydric Soils List
-Reducing Conditions _listed on National Hydric Soils List ,
Gleyed or Low-Chroma Colors _Other.(Explain in Remarks)
Remarks:
i
AJo,IS lt4<y be , 1iV/101ta� C.�ltnnt SJ17 A 5Z 11
WETLAND DETERMINATION
Hydrophytic Vegetation Present? No (Circle) (Circle) '
Wodand Hydrology Present? Yes
Hydric Soils Present? Yes Is this Sampling Point Within a Wetland? Yes
Remarks:
4 v3"i�t✓c- l��`�����s L h y/I.U.I.�y J .T o�/s
oDc�ztIzeCa �
Approved by H USAC 3l92
' DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE Wetlands Delineation Manual)
' Project/Site: u1 R� ST G(ND AVE. CJLv r2T AFA44cT Date:
Applicant/Owner: G i e w eh 6 l;c ,e County: l5/.vim
' Investigator: State:
Do Normal Circumstances exist on the site? oTs No Community ID: '8�
Is the site significantly disturbed (Atypical Situation)? Yes dtlib Transect ID:
Is the area a potential Problem Area? Yes Plot ID: z
(if needed, explain on reverse.) ` 1--
VEGETATION
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
1� 9. T . .
2 f0;r0-Cai C&tl Mao 10.
4. / ,k et.ice G r y 12.
14.
7. is.
8. 16.
' Percent of Dominant Species that are OeL. FACW or FAC a5 -
(excluding FAC-). / ��
' Remarks. pe r T py, pT -
-�c (� nail /oo frcri. c+�- •�^-f�-ti- f� 7`�ie QX�J`��^f '{�.� ��✓.�idq . Qa.+�-�'a
�,,t iu u��- l,ti,.to( �v� ,�d,r^•t p��f a�-c f c�f`�.Eo( �- � 6.�- (l s�p� �(xr�c�
HYDROLOGY
Recorded Data (Describe in Remarks): Wetland Hydrology Indicators:
—Stream. Lake, or Tide Gauge Primary Indicators:
_Aerial Photographs Inundated
— _Other —Water
in Upper 12 Inches
No Recorded Data Available Water Marks
_Drift Lines
_Sediment Deposits
' Field Observations: _Drainage Patterns in Wetiands
Secondary Indicators (2 or more required):
Depth of Surface Water: �Cn.) _Oxidized Root Channels in Upper 12 Inches
Water-Stained Leaves
' Depth to Free Water in Pit: (in.) _Local Soil Survey Data
FAC-Neutral Test
Depth to Saturated Soil: (in.) _Other (Explain in Remarks)
Remarks: Jl FP fe�+wt.✓ C✓r/f /��v���� W�P� l e.J
c,�i�-�--� G�; l� �J G•��vt� i 5 � C�cc�.�t r� r=�,J�r/�, �'�U ��
S fL 14
1
SOILS 1
Map Unit Name 1
(Series and Phase): U R B a Drainage Class:
Feld Observations -�\
Taxonomy(Subgroup): Confirm Mapped Type? sr No
Profile Descriotion: 1
Depth Matrix Color Mottle Colors Mor.:e Texture, Concretions,
inches) Horizon (Munsell Moist) (Munsell Moist) Abundance/Co•:trast Structure, etc.
• 1
1
• 1
Hydric Soil Indicators:
_Histosol _Concretions 1
Histic Epipedon _High Organic Content in Surface Layer in Sandy Soils
Sulfidic Odor —Organic Streaking in Sandy Soils,-
_Aquic Moisture Regime _Listed on Local Hydric Soils List
Reducing Conditions _Listed on National Hydric Soils List 1
Gleyed or Low-Chroma Colors Other,(Explain in Remarks)
Remarks:
1
WETLAND DETERMINATION
Hydrophytic Vegetation Present? No (Circle) (Circle) 1
Wetland Hydrology Present? No
Hydric Soils Present? No Is this Sampling Point Within e Wetland? 6� No
Remarks: �LG /f £ ����Z„ �_ �f�.. �iC.���WG✓' � ,/1�..�*�,e
w i t^ rJ t^u' C,w
3 id
Approved by H U AC /92
1
• 1
1
' DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE Wetlands Delineation Manual)
' Project/Site: u/ 3 ST — LINO Ova. C n_vtnT kk1144c T Date: _ Z3 '9 7
Applicant/Owner: G r e µ or 6(ram oeV-j Pe County:
' Investigator: OQC.5 State: GdH
Do Normal Circumstances exist on the site? (Yd�r No Community ID:
Is the site significantly disturbed (Atypical Situation)? Yes d%a Transect ID:
Is the area a potential Problem Area? Yes Nb Plot ID: /
(if needed, explain on reverse.) �w�)
' VEGETATION
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
S f
1. �Drn�s s�olok; fcra � s.
2. 04,14 ri s �,r u�.�, ceAc _ FAG 10.
3 l/rfic� d�ai��
4, 12.
5. 13.
14.
7. 15.
8. 16.
' Percent of Dominant Species that are O@L,FACW or FAC -
(excluding FAC-).
' Remarks: PS� 0! 31�n G}� Qfl c _ '` -/v/V
HYDROLOGY
Recorded Data (Describe in Remarks): Wotland Hydrology Indicators:
—Stream, Lake, or Tide Gauge Primary Indicators:
_Aerial Photographs _Inundated
Other Saturated in Upper 12 Inches
—
No Recorded Data Available Water Marks
—Drift Lines
_Sediment Deposits
' Field Observations: —Drainage Patterns in Wetlands
Secondary Indicators (2 or more required):
Depth of Surface Water: Cn.) _Oxidized Root Channels in Upper 12 Inches
Water-Stained Leaves
' Depth to Free Water in Pit: - (in.) =Local Soil Survey Data
FAC-Neutral Test
Depth to Saturated Soil: (in.)
Other (Explain in Remarks)
' Remarks:
!�O
� �� S'� �"�in.tG� *t�.i� W� �k �R.QO�-d� •!Lt � d'�W�. J-�.O• v�1u-w•d '�o J
Soil Uk4o✓ !�•nouv�
SOILS '
Map Unit Name ,
(Series and Phase): U Drainage Class: ►' od�L'��r
Reid Observations
Taxonomy(Subgroup): Corficn Mapped Type? WEP No
Profile Descriotion: ,
Depth Matrix Color Mottle Colors Mor.:c Texture, Concretions,
inches) Herizon (Munsell Moist) (Munsell Moist) Abundance/Co-mast Structure, etc.
Hydric Soil Indicators:
_Histosol _Concretions ,
_Histic Epipedon _High Organic Content in Surface Layer in Sandy Soils
_Sulfidic Odor _Organic Streaking in Sandy Soils
_Aquic Moisture Regime _Listed on Local Hydric Soils Ust
Reducing Conditions _Listed on National Hydric Soils List ` J. '
Gleyed or Low-Chroma Colors _Other.(Explain in Remarks)
Remarks: /1�K �v✓��ln GIN' /Q~� �`�"'— � � JD G'�3L
1
WETLAND DETERMINATION
Hydrophyric Vegetation Present? eg No (Circle) (Circle) '
Wetland Hydrology Present? a No
Hydric Soils Present? No Is this Sampling Point Within a Wetland? No
Remarks. !e'-!/2d( ` D 6''/
,�J o 3 i-�j v2 /►no(iG C c✓(Jl f d G J y
Approved by H U AC 3/92
' DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE Wetlands Delineation Manual)
' -97
Project/Site Ul 2 >z� ST Gl1V0 �V>:. C'v� vr<rzT �kPchcT Date: j �3
Applicant/Owner: G e County:
Investigator: State: 11�
Do Normal Circumstances exist on the site? des No Community ID: W/o1/
Is the site significantly disturbed (Atypical Situation)? Yes c9b Transect ID:
' Is the area a potential Problem Area? Yes 151
Plot ID:)�-
(if needed, explain on reverse.)
VEGETATION
Dominant Plant Species_ Stratum Indicator Dominant Plant Species Stratum Indicator
1. �// I� •1 A/Gl Kdi/rt.(CL�SC� �/4 9.
2. 7 C Ci Gil D GA. 10.
' 3' 11.
4• 12.
S. 13.
' 6 14
7. is.
8. - 16. -
Percent of Dominant Species that are OBL. FACW or FAC -
(excluding FAC-).
Remarks:
apt
HYDROLOGY
Recorded Data (Describe in Remarks): Watland Hydrology Indicators:
—Stream, Lake, or Tide Gauge Primary Indicators:
_Aerial Photographs _Inundated
— _Other Saturated in Upper 12 Inches
—
No Recorded Data Available Water Marks
—Drift Lines
_Sediment Deposits
' Reid Observations: _Drainage Patterns in Wadands
Secondary Indicators (2 or more required):
Depth of Surface Water: (in.) _Oxidized Root Channels in Upper 12 Inches
—Water-Stained Leaves
' Depth to Free Water in Pit: _ (in.) —Local Soil Survey Data
FAC-Neutral Test
Depth to Saturated Soil: (in.) —Other (Explain in Remarks)
' Remarks: �CD'� � �I'�/vV•- ait.C,�, �� ��'C.C� �/1�4�-+� v'GC-fi(/� �-
rli""'I
' �uPiw — .✓w� •G�i" .,Zy/,i. ;�,y/• �lof /OL�XGI- � I ewl ode
r G!�1 (-Cln„rC.r p 6 r�i t.... O'�,�1'C.h.r,�•� t}C. ,.ems
SOILS '
Map Unit Name I , ` � _4L1 - ,
(Series and Phase): U RBQ/� __ Drainage Class:
Feld Observations
Taxonomy(Subgroup): Confirn Mapped Type? No
Profile Descriotion: '
Depth Matrix Color Mottle Colors Mor.:c Texture, Concretions,
inched Hcrizon (Munsell Moist) (Munsell Moistl Abundance/Co avast Structure, etc.
0)o
Hydric Soil Indicators:
_Histosol _Concretions '
_Histic Epipedon _High Organic Content in Surface Layer in Sandy Soils
_Sulfidic Odor _Organic Streaking in Sandy Soils
Aquic Moisture Regime _Listed on Local Hydric Soils List
-_Reducing Conditions _Listed on National Hydric Soils List '
Gleyed or Low-Chroma Colors _Other.(Explain in Remarks)
Remarks:
/ `� ��G,�I�/ d� �y��- I-d•� o �-ter✓�' �'�^ <f��
WETLAND DETERMINATION
Hydrophytic Vegetation Present? d_e3 No (Circle) (Circle) '
Wetland Hydrology Present? Yes dS,
Hydric Soils Present? Yes di.) Is this Sampling Point Within a Wetland? Yes
Remarks: '
Approved by H USAC 3/92
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE Wetlands Delineation Manual)
' -9
ProjecUSite: W 2 � ST Lirvo l4v>:. CvLva<nT kkPc.�}cT Date: 7,j� �3
Applicant/Owner: C i e K eY, Pulolip County:
Investigator: State:
' Do Normal Circumstances exist on the site? CYO No Community ID: W OAJ
Is the site significantly disturbed (Atypical Situation)? Yes &I]b Transect ID:
Is the area a potential Problem Area? Yes Plot ID: 3
(If needed, explain on reverse.)
' VEGETATION
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
t
1. Y htiluti,l a✓ukiL%MALU4 9.
2 GruLw FAG 10.
3. vt9J oG9yf�J�% _� 14G 11.
'T-
4. 12.
S. 13.
' 6- 14.
7. 15-
8. 16.
Percent of Dominant Species that are 081., FACW or FAC f�v -
(excluding FAC-). /
' Remarks:
HYDROLOGY
Recorded Data (Describe in Remarks): Wedand Hydrology Indicators:
—Stream. Lake, or Tide Gauge Primary Indicators:
_Aerial Photographs _Inundated
— _Other —Saturated in Upper 12 Inches
No Recorded Data Available Water Marks
_Drift Lines
—Sediment Deposits
' Field Observations- _Drainage Patterns in Watfands
Secondary Indicators (2 or more required):
Depth of Surface Water: (in.) —Oxidized Root Channels in Upper 12 Inches
—Water-Stained Leaves
Depth to Free Water in Pit: _ (in.) —Local Soil Survey Data
FAC-Neutral Test
Depth to Saturated Soil: (in.) _Other (Explain in Remarks)
' Remarks: Nt' QVjQ(~f!1' P (o f dY r Si
✓tvl� --
1
SOILS '
Map Unit Namo RBQ 1 , 1
(Series and Phase): U ,`+ _ Drainage Class:
Feld Observations
Taxonomy(Subgroup)' Confirn Mapped Type? Yes No
Profile Description: 1
Depth Matrix Color Mottle Colors Mor.:t Texture, Concretions,
inches) Hcrizon (Munsell Moist) (Munsell Moist) Abundance/Co-mast Structure, etc.
1
i
1
Hydric Soil Indicators:
_Histosol _Concretions 1
_Histic Epipedon _High Organic Content in Surface Layer in Sandy Soils
Sulfidic Odor _Organic Streaking in Sandy Soils
_
Aquic Moisture Regime _Listed on Local Hydric Soils List
—Reducing Conditions _Listed on National Hydric Soils List 1
Gloyed or Low-Chroma Colors _Other.(Explain in Remarks)
Remarks:
--��jj
"14t t,(Xt A- Z,,l GZ W4,1zz Qc G uh tik ro
1
WETLAND DETERMINATION
Hydrophytic Vegetation Present? o (Circle) (Circle) 1
Wetland Hydrology Present? Yes
Hydric Soils Present? Yes Is this Sampling Point Within a Wetland? Yes
Remarks:
l-l�-••t tr��49'�--0�} �+�.rP G�.B.�..•. d�-- l 1�. t r
Approved by H USAC 3/92
1
1
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE Wetlands Delineation Manual)
Project/Site: ul 2 ST — LINO AV5. C1_1k Vt2? Rk"44C"r Date: 31 7
Applicant/Owner: G 6Ur_ or(G County:
' Investigator: / f tNu'c3 State: G/A
Do Normal Circumstances exist on the site? o� s No Community ID: tO -101/
Is the site significantly disturbed (Atypical Situation)? Yes cjSrb Transect ID:
Is the area a potential Problem Area? Yes 10 Plot ID:
(if needed, explain on reverse.)
' VEGETATION
Dominant Plant S eciea Stratum Indicator Dominant Plant Species Stratum Indicator
- T.
2. 10.
4, 12.
S. 13.
6, 14.
7. is.
16. -
Percent of Dominant Species that are OBL FACW or FAC v y
(excluding FAC-). (�
Remarks: �Q
HYDROLOGY
Recorded Data (Describe in Remarks): Wettand Hydrology Indicators:
—Stream, Lake, or Tide Gauge Primary Indicators:
—Aerial Photographs Inundated
' _Other Saturated in Upper 12 Inches
—
No Recorded Data Available Water Marks
_Drift Lines
_Sediment Deposits
' Reld Observations: _Drainage Patterns in Wetlands
Secondary Indicators (2 or more required):
Depth of Surface Water: (n.) _Oxidized Root Channels in Upper 12 Inches
_Water-Stained Leaves
Depth to Free Water in Pit: (in.) —Local Soil Survey Data
FAC-Neutral Test
Depth to Saturated Soil: (in.) _Other (Explain in Remarks)
Remarks: � a �G
SOILS
Map Unit Name I `
(Series and Phase): U 9E3,41 ' _ Drainage Class:
Field Observations
Taxonomy(Subgroup): Confirm Mapped Type? Yes No
Profile Descriotion: '
Depth Matrix Color Matde Colors Mont Texture, Concretions,
inches) Hcrizon (Munsell Moist) (Munsell Moist) Abundance/Co-mast Structure, etc.
Y3 ---- -_ -
Hydric Soil Indicators:
_Histosol _Concretions
_Histic Epipedon _High Organic Content in Surface Layer in Sandy Soils
_Sulfidic Odor _Organic Streaking in Sandy Soils
_Aquic Moisture Regime _Listed on Local Hydric Soils List
—Reducing Conditions _Listed on National Hydric Soils List ,
Gleyed or Low-Chroma Colors _Other.(Explain in Remarks)
Remarks:
WETLAND DETERMINATION
Hydrophytic Vegetation Present? V No (Circle) (Circle)
Wetland Hydrology Present? Yes @M
Hydric Soils Present? Yes Is this Sampling Point Within a Wetland? Yes
Remarks:
Approved by H USAC 3192
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