HomeMy WebLinkAboutRS_Wetlands Study_Jurgen RUV_200130_v1.pdfAltmann Oliver Associates, LLC AOA
PO Box 578 Carnation, WA 98014 Office (425) 333-4535 Fax (425) 333-4509
July 8, 2019
Steve Jurgens
Sjurgens22@gmail.com
SUBJECT: Wetland and Stream Review for Jurgens Property
2301 Jones Ave. NE, Parcel 334450-0210
Renton, WA
Dear Steve:
Environmental
Planning &
Landscape
Architecture
AOA -5910
On May 21, 2019 1 conducted a wetland and stream reconnaissance on the subject
property utilizing the methodology outlined in the May 2010 Regional Supplement to
the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys,
and Coast Region (Version 2.0). The site is currently developed with your existing
residence, gravel parking areas, and yard. Kennydale Creek flows from southeast to
northwest through the yard in the northeast corner of the site.
One wetland (Wetland A) was observed along the creek within a broad topographic
swale immediately off-site to the north. The southern boundary of the wetland in the
vicinity of your north property line was delineated with pink flagging numbered A-1
through A-6 during the site review.
Wetland A and Kennydale Creek
Wetland A consists of a Riverine Hydrogeomorphic (HGM) class wetland containing
a forested plant community that included black cottonwood (Populus trichocarpa),
red alder (Alnus rubra), Pacific willow (Salix lasiandra), salmonberry (Rubus
spectabilis), Himalayan blackberry (Rubus armeniacus), lady fern (Athyrium filix-
femina), and skunk cabbage (Lysichiton americanum). Hydrologic support to the
wetland appears to be from both groundwater seepage and overbank flooding.
Wetland A was determined to meet the criteria for a Category I I wetland with 4
Habitat Points (Attachment A). Category II wetlands with 4 Habitat Points require a
standard 100 -foot buffer and 15 -foot building setback per RMC 4-3-050.G.2. It is my
understanding that Kennydale Creek is considered a Type Np stream and requires a
standard 75 -foot buffer plus 15 -foot building setback.
Steve Jurgens
July 8, 2019
Page 2
Existing Wetland and Stream Functions and Values
Wetlands, in general, provide many valuable ecological and social functions,
including stormwater storage, water quality protection, groundwater recharge
and discharge, and wildlife habitat. Wetland A has the capacity to provide
many of these functions. Although limited, the wetland does provide some
stormwater storage that helps reduce downstream flooding while also
trapping sediments. The trapping of sediments and other pollutants within
the wetland maintains water quality in downstream areas and aids in the
prevention of fish habitat degradation by limiting silt accumulation within
spawning areas. The wetland provides further benefit to fish and other
wildlife by releasing water slowly during the dry summer months, thereby
contributing to the base flow of the stream.
In addition to its hydrologic functions, the wetland also provides biological functions.
The wetland provides habitat for a variety of wildlife species typical of suburban
habitats within the Puget Sound lowlands. Another important biologic function of the
wetland is the transport of nutrients to downstream areas. Nutrients transported to
downstream areas provide biological support for fish and other aquatic wildlife.
The wetland does provide some limited cultural wetland functions as part of
the overall open space corridor associated with Kennydale Creek.
Proposed Project
It is my understanding that you are proposing an addition to your single-
family residence. Due to the location of the existing structure, the addition
must be constructed within the buffer to the north of the house. The area of
the proposed expansion currently consists entirely of existing gravel parking
and no significant vegetation would be removed as part of your proposed
project.
The buffer area associated with your proposed expansion does not currently
provide any functional benefit to the wetland and stream. It is also my
understanding that as part of the project you are proposing to plant a variety
of native tree and shrub species along the north property line and adjacent
Kennydale Creek to increase the plant species and structural diversity of the
buffers. These plantings would provide a physical and visual screen to the
wetland and stream from the residence and would increase the habitat and
protection functions of the buffer over current conditions.
Since there should be no increase in pollution generating surfaces
associated with the project, there are no anticipated hydrologic impacts to
the wetland.
Steve Jurgens
July 8, 2019
Page 3
Recommendation
Since it is not possible to develop the expansion outside of the standard or reduced
buffers on the site, the project can only occur utilizing an alternate buffer that meets
all of the criteria outlined in RMC 4-3-050.G.9.d.ii. These criteria include the
preparation of a buffer enhancement planting plan that would demonstrate an
increase in the functions of the buffer over current conditions.
It is my recommendation that a meeting be held with the City of Renton Planning
Department to determine whether an alternate buffer would likely be approved prior
to the preparation of detailed site plans.
If you have any questions, please call me at (425) 333-4535.
Sincerely,
ALTMANN OLIVER ASSOCIATES, LLC
John Altmann
Ecologist
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Wetland name or number A
RATING SUMMARY — Western Washington
Name of wetland (or ID #): 334450-0210
Date of site visit: 5/21/2019
Rated by Altmann Trained by Ecology?21 YesE] No Date of training 03/08 & 03/15
HGM Class used for rating Riverine & Fresh Water Tidal Wetland has multiple HGM classes? 21 Yes ❑ No
NOTE: Form is not complete with out the figures requested (figures can be combined).
Source of base aerial photo/map King County iMAP
OVERALL WETLAND CATEGORY II (based on functions o or special characteristics El )
1. Category of wetland based on FUNCTIONS
Category I - Total score = 23 - 27
X Category II - Total score = 20 - 22
Category III - Total score = 16 - 19
Category IV - Total score = 9 - 15
2. Category based on SPECIAL CHARACTERISTICS of wetland
CHARACTERISTIC
Improving
Hydrologic
Habitat
FUNCTION
Bog
Mature Forest
Water Quality
Old Growth Forest
Coastal Lagoon
List appropriate rating (H, M, L)
Site Potential
M
H
L
Landscape Potential
H
H
L
Value
H
M
M Total
Score Based on
8
8
4 20
Ratings
2. Category based on SPECIAL CHARACTERISTICS of wetland
CHARACTERISTIC
Category
Estuarine
Wetland of High Conservation Value
Bog
Mature Forest
Old Growth Forest
Coastal Lagoon
Interdunal
None of the above
X
Score for each
function based
on three
ratings
(order of ratings
is not
important)
9=H,H,H
8=H,H,M
7=H,H,L
7=H,M,M
6=H,M,L
6=M,M,M
5=H,L,L
5=M,M,L
4=M,L,L
3=L,L,L
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015 1 WSDOT Adapted Form - January 14, 2015
Wetland name or number A
RIVERINE AND FRESHWATER TIDAL FRINGE WETLANDS
Water Quality Functions - Indicators that the site functions to improve water quality
R 1.0. Does the site have the potential to improve water quality?
R 1.1. Area of surface depressions within the Riverine wetland that can trap sediments during a
1
flooding event:
1
Depressions cover > 3/4 area of wetland points = 8
2
Depressions cover >'/2 area of wetland points = 4
Depressions present but cover <'/2 area of wetland points = 2
1
No depressions present points = 0
R 1.2. Structure of plants in the wetland (areas with >90% cover at person height, not Cowardin
2
classes)
0
Trees or shrubs > 2/3 area of the wetland points = 8
° Trees or shrubs >'/3 area of the wetland points = 6
8
° Herbaceous plants (> 6 in high) > 2/3 area of the wetland points = 6
Herbaceous plants (> 6 in high) >'/3 area of the wetland points = 3
Trees, shrubs, and ungrazed herbaceous <'/3 area of the wetland points = 0
Total for R 1 Add the points in the boxes abovel
10
Rating of Site Potential If score is: El 12 -16 = H o 6 - 11 = M ° 0 - 5 = L Record the rating on the first page
R 2.0. Does the landscape have the potential to support the water quality function of the site?
R2.1. Is the wetland within an incorporated city or within its UGA? Yes = 2 No = 0
2
R 2.2. Does the contributing basin to the wetland include a UGA or
1
incorporated area? Yes = 1 No = 0
1
R 2.3. Does at least 10% of the contributing basin contain tilled fields,
0
pastures, or forests that have been clearcut within the last 5 years? Yes = 1 No = 0
R 2.4. Is > 10% of the area within 150 ft of the wetland in land uses that
1
generate pollutants? Yes = 1 No = 0
R 2.5. Are there other sources of pollutants coming into the wetland that are
2
not listed in questions R 2.1 - R 2.4?
0
Other Sources Yes = 1 No = 0
Total for R 2 Add the points in the boxes above
4
Rating of Landscape Potential If score is: 0 3 - 6 = H ° 1 or 2 = M ° 0 = L Record the rating on the first page
R 3.0. Is the water quality improvement provided by the site valuable to society?
R 3.1. Is the wetland along a stream or river that is on the 303(d) list or on a
1
tributary that drains to one within 1 mi? Yes = 1 No = 0
R 3.2. Is the wetland along a stream or river that has TMDL limits for nutrients,
1
toxics, or pathogens? Yes = 1 No = 0
R 3.3. Has the site been identified in a watershed or local plan as important for
maintaining water quality? (answer YES if there is a TMDL for the drainage in
0
which the unit is found) Yes = 2 No = 0
Total for R 3 Add the points in the boxes above
2
Rating of Value If score is: 0 2 - 4 = H ° 1 = M ° 0 = L
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015
Record the rating on the first page
5 WSDOT Adapted Form - January 14, 2015
Wetland name or number A
RIVERINE AND FRESHWATER TIDAL FRINGE WETLANDS
Hydrologic Functions - Indicators that site functions to reduce flooding and stream erosion
R 4.0. Does the site have the potential to reduce flooding and erosion?
R 4.1. Characteristics of the overbank storage the wetland provides:
Estimate the average width of the wetland perpendicular to the direction of the flow and the width
of the stream or river channel (distance between banks). Calculate the ratio: (average width of
1
wetland)/(average width of stream between banks).
If the ratio is more than 20 points = 9
6
If the ratio is 10 - 20 points = 6
If the ratio is 5 - < 10 points = 4
0
If the ratio is 1 - < 5 points = 2
If the ratio is < 1 points = 1
1
R 4.2. Characteristics of plants that slow down water velocities during floods: Treat large woody
debris as forest or shrub. Choose the points appropriate for the best description (polygons need
to have >90% cover at person height. These are NOT Cowardin classes).
Forest or shrub for >'/3 area OR emergent plants > 2/3 area points = 7
7
Forest or shrub for >'/10 area OR emergent plants >'/3 area points = 4
Plants do not meet above criteria points = 0
Total for R 4 Add the points in the boxes abovel
13
Rating of Site Potential If score is: 0 12 -16 = H El 6 - 11 = M El 0 - 5 = L Record the rating on the first page
R 5.0. Does the landscape have the potential to support the hydrologic functions of the site?
R 5.1. Is the stream or river adjacent to the wetland downcut? Yes = 0 No = 1 1
R 5.2. Does the up -gradient watershed include a UGA or incorporated area? Yes = 1 No = 0 1
R 5.3 Is the up -gradient stream or river controlled by dams? Yes = 0 No = 1 1
Total for R 5 Add the points in the boxes above 3
Rating of Landscape Potential If score is: 0 3 = H L1 1 or 2 = M 01 0 = L Record the rating on the first page
R 6.0. Are the hydrologic functions provided by the site valuable to society?
R 6.1. Distance to the nearest areas downstream that have flooding problems?
Choose the description that best fits the site.
The sub -basin immediately down -gradient of the wetland has
flooding problems that result in damage to human or natural
1
resources (e.g., houses or salmon redds) points = 2
Surface flooding problems are in a sub -basin farther down -gradient points = 1
No flooding problems anywhere downstream points = 0
R 6.2. Has the site been identified as important for flood storage or flood
0
conveyance in a regional flood control plan? Yes = 2 No = 0
Total for R 6 Add the points in the boxes above
1
Rating of Value If score is: El 2- 4= H o 1= M El 0= L
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015
Record the rating on the first page
6 WSDOT Adapted Form - January 14, 2015
Wetland name or number A
These questions apply to wetlands of all HGM classes.
HABITAT FUNCTIONS - Indicators that site functions to provide important habitat
H 1.0. Does the site have the potential to provide habitat?
H 1.1. Structure of plant community: Indicators are Cowardin classes and strata within the
Forested class. Check the Cowardin plant classes in the wetland. Up to 10 patches may be
combined for each class to meet the threshold of % ac or more than 10% of the unit if it is smaller
than 2.5 ac. Add the number of structures checked.
Aquatic bed 4 structures or more: points = 4
1
o Emergent 3 structures: points = 2
Scrub -shrub (areas where shrubs have > 30% cover) 2 structures: points - 1
o Forested (areas where trees have > 30% cover) 1 structure: points = 0
If the unit has a Forested class, check if:
Q The Forested class has 3 out of 5 strata (canopy, sub -canopy, shrubs, herbaceous,
moss/ground-cover) that each cover 20% within the Forested polygon
H 1.2. Hydroperiods
Check the types of water regimes (hydroperiods) present within the wetland. The water regime
has to cover more than 10% of the wetland or'/4 ac to count (see text for descriptions of
hydroperiods ).
Permanently flooded or inundated 4 or more types present: points = 3
Seasonally flooded or inundated 3 types present: points = 2
2
o Occasionally flooded or inundated 2 types present: points = 1
ID Saturated only 1 types present: points = 0
o Permanently flowing stream or river in, or adjacent to, the wetland
Seasonally flowing stream in, or adjacent to, the wetland
El Lake Fringe wetland 2 points
o Freshwater tidal wetland 2 points
H 1.3. Richness of plant species
Count the number of plant species in the wetland that cover at least 10 ft2.
Different patches of the same species can be combined to meet the size threshold and you do not
have to name the species. Do not include Eurasian milfoil, reed canarygrass, purple
loosestrife, Canadian thistle
1
If you counted: > 19 species points = 2
5 - 19 species points = 1
< 5 species points = 0
H 1.4. Interspersion of habitats
Decide from the diagrams below whether interspersion among Cowardin plants classes
(described in H 1.1), or the classes and unvegetated areas (can include open water or mudflats)
is high, moderate, low, or none. If you have four or more plant classes or three classes and open
water, the rating is always high.
o a
0
None = 0 points Low = 1 point Moderate = 2 points
All three diagrams
in this row are
HIGH = 3 points
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015 7 WSDOT Adapted Form - January 14, 2015
vvetlano name or numoer A
H 1.5. Special habitat features:
Check the habitat features that are present in the wetland. The number of checks is the number
of points.
o Large, downed, woody debris within the wetland (> 4 in diameter and 6 ft long)
o Standing snags (dbh > 4 in) within the wetland
Undercut banks are present for at least 6.6 ft (2 m) and/or overhanging plants extends
at least 3.3 ft (1 m) over a stream (or ditch) in, or contiguous with the wetland, for at
least 33 ft (10 m) 2
❑ Stable steep banks of fine material that might be used by beaver or muskrat for denning
(> 30 degree slope) OR signs of recent beaver activity are present (cut shrubs or trees
that have not yet weathered where wood is exposed)
❑ At least'/ ac of thin -stemmed persistent plants or woody branches are present in areas
that are permanently or seasonally inundated (structures for egg -laying by amphibians)
❑ Invasive plants cover less than 25% of the wetland area in every stratum of plants (see
H 1.1 for list of strata)
Total for H 1 Add the points in the boxes abovel 6
Rating of Site Potential If Score is: ❑ 15 - 18 = H ❑ 7 -14 = M o 0 - 6 = L Record the rating on the first page
H 2.0. Does the landscape have the potential to support the habitat function of the site?
H 2.1 Accessible habitat (include only habitat that directly abuts wetland unit).
Calculate:
0 % undisturbed habitat + ( 0.03 % moderate & low intensity land uses / 2) = 0.015%
If total accessible habitat is:
0
>'/3 (33.3%) of 1 km Polygon points = 3
20 - 33% of 1 km Polygon points = 2
10 - 19% of 1 km Polygon points = 1
1
< 10 % of 1 km Polygon points = 0
H 2.2. Undisturbed habitat in 1 km Polygon around the wetland.
Calculate:
12.8 % undisturbed habitat + ( 15.1 % moderate & low intensity land uses / 2) = 20.35%
watershed plan
2
Undisturbed habitat > 50% of Polygon points = 3
Undisturbed habitat 10 - 50% and in 1-3 patches points = 2
Undisturbed habitat 10 - 50% and > 3 patches points = 1
Undisturbed habitat < 10% of 1 km Polygon points = 0
H 2.3 Land use intensity in 1 km Polygon: If
> 50% of 1 km Polygon is high intensity land use points = (-2)
-2
<_ 50% of 1 km Polygon is high intensity points = 0
Total for H 2 Add the points in the boxes above
0
Rating of Landscape Potential If Score is: ❑ 4 - 6 = H ❑ 1 - 3 = M o < 1 = L Record the rating on the first page
H 3.0. Is the habitat provided by the site valuable to society?
H 3.1. Does the site provide habitat for species valued in laws, regulations, or policies? Choose
only the highest score that applies to the wetland being rated.
Site meets ANY of the following criteria: points = 2
❑ It has 3 or more priority habitats within 100 m (see next page)
❑ It provides habitat for Threatened or Endangered species (any plant
or animal on the state or federal lists)
❑ It is mapped as a location for an individual WDFW priority species
1
❑ It is a Wetland of High Conservation Value as determined by the
Department of Natural Resources
❑ It has been categorized as an important habitat site in a local or
regional comprehensive plan, in a Shoreline Master Plan, or in a
watershed plan
Site has 1 or 2 priority habitats (listed on next page) with in 100m points = 1
Site does not meet any of the criteria above points = 0
Rating of Value If Score is: ❑ 2 = H o 1 = M ❑ 0 = L
Wetlani9 Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015 8
Record the rating on the first page
WSDOT Adapted Form - January 14, 2015
Wetland name or number A
WDFW Priority Habitats
Priority habitats listed by WDFW (see complete descriptions of WDFW priority habitats, and the counties in
which they can be found, in: Washington Department of Fish and Wildlife. 2008. Priority Habitat and Species
List. Olympia, Washington. 177 pp.
http://wdfw.wa.gov/publications/00165/wdfw00165.pdf or access the list from here:
http://wdfw.wa.gov/conservation/phs/list/
Count how many of the following priority habitats are within 330 ft (100 m) of the wetland unit: NOTE: This
question is independent of the land use between the wetland unit and the priority habitat.
0 Aspen Stands: Pure or mixed stands of aspen greater than 1 ac (0.4 ha).
o Biodiversity Areas and Corridors: Areas of habitat that are relatively important to various species of
native fish and wildlife (full descriptions in WDFW PHS report).
E] Herbaceous Balds: Variable size patches of grass and forbs on shallow soils over bedrock.
° Old-growth/Mature forests: Old-growth west of Cascade crest — Stands of at least 2 tree species,
forming a multi -layered canopy with occasional small openings; with at least 8 trees/ac (20 trees/ha)
> 32 in (81 cm) dbh or > 200 years of age. Mature forests — Stands with average diameters
exceeding 21 in (53 cm) dbh; crown cover may be less than 100%; decay, decadence, numbers of
snags, and quantity of large downed material is generally less than that found in old-growth; 80-200
years old west of the Cascade crest.
Oregon White Oak: Woodland stands of pure oak or oak/conifer associations where canopy
coverage of the oak component is important (full descriptions in WDFW PHS report p. 158 — see web
link above).
ID Riparian: The area adjacent to aquatic systems with flowing water that contains elements of both
aquatic and terrestrial ecosystems which mutually influence each other.
Westside Prairies: Herbaceous, non -forested plant communities that can either take the form of a
dry prairie or a wet prairie (full descriptions in WDFW PHS report p. 161 — see web link above).
Instream: The combination of physical, biological, and chemical processes and conditions that
interact to provide functional life history requirements for instream fish and wildlife resources.
Nearshore: Relatively undisturbed nearshore habitats. These include Coastal Nearshore, Open
Coast Nearshore, and Puget Sound Nearshore. (full descriptions of habitats and the definition of
relatively undisturbed are in WDFW report — see web link on previous page).
Caves: A naturally occurring cavity, recess, void, or system of interconnected passages under the
earth in soils, rock, ice, or other geological formations and is large enough to contain a human.
E] Cliffs: Greater than 25 ft (7.6 m) high and occurring below 5000 ft elevation.
Talus: Homogenous areas of rock rubble ranging in average size 0.5 - 6.5 ft (0.15 - 2.0 m),
composed of basalt, andesite, and/or sedimentary rock, including riprap slides and mine tailings. May
be associated with cliffs.
Snags and Logs: Trees are considered snags if they are dead or dying and exhibit sufficient decay
characteristics to enable cavity excavation/use by wildlife. Priority snags have a diameter at breast
height of > 20 in (51 cm) in western Washington and are > 6.5 ft (2 m) in height. Priority logs are > 12
in (30 cm) in diameter at the largest end, and > 20 ft (6 m) long.
Note: All vegetated wetlands are by definition a priority habitat but are not included in this list because they are
addressed elsewhere.
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015 9 WSDOT Adapted Form - January 14, 2015
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8/25/2018 TMDL Project Information for WRIA 8 1 WA State Department of Ecology
lhftp://www.ecy.wa.gov:80/programs/wq/tmd[fTMDLsbyWria/tmdl-wriaO8.html F—Go-1 NOV MAi, OCT Q 0
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26 Jul 2009 - 24 Oct 2017 2015 1017 2018 W -
>� DEPARTMENT OF
ECOLOGY
State of Washington
Home Water Quality & Supply
Figure D
Waste & Toxics
Water Quality Improvement > Water Quality Improvement Projects by WRIA > WRIA 8: Cedar-Sammamish
WRIA 8: Cedar-Sammamish
The following table lists overview information for water quality improvement
projects (including total maximum daily loads, or TMDLs) for this water resource
inventory area (WRIA). Please use links (where available) for more information on
a project.
Counties
• King,
Snohomish
Air & Climate
Waterbody Name
Pollutants
Status**
TMDL Lead
Ballinger Lake
Total Phosphorus
Approved by EPA
Tricia Shoblom
425-649-7288
Bear -Evans Creek Basin
Fecal Coliform
Approved by EPA
Joan Nolan
425-649-4425
Dissolved Oxygen
Approved by EPA
Temperature
Cottage Lake
Total Phosphorus
Approved by EPA
Tricia Shoblom
Has an implementation
425-649-7288
plan
Issaquah Creek Basin
Fecal Coliform
Approved by EPA
Joan Nolan
425-649-4425
Little Bear Creek
Fecal Coliform
Approved by EPA
Moh EKdL9k
Tributaries:
425-649-7036
Trout Stream
Great Dane
Creek
Cutthroat
Creek
North Creek
Fecal Coliform
Approved by EPA
1WW SvrjQ1
Has an implementation
425-649-7036
plan
Pipers Creek
Fecal Coliform
Approved by EPA
Joan Nolan
425-649-4425
Sammamish River
Dissolved Oxygen
Field work starts summer
Ralph Svrjcek
Temperature
2015
425-649-7036
Swamp Creek
Fecal Coliform
Approved by EPA
Ralph SvrjLek
Has an implementation
425-649-7036
plan
* * Status will be listed as one of the following: Approved by EPA, Under Development or Implementation
For more information about WRIA 8:
• Waterbodies in WRIA 8 - using the Water Quality Assessment Query Tool
Watershed Information for WRIA 8
* The Department of Ecology and other state resource agencies frequently use a system of 62 "Water Resource Inventory Areas" or
"WRIAs" to refer to the state's major watershed basins.
About us I Contact us
http://web.archive.org/web/20170330212555/http:/Www.ecy.wa.gov:801programs/wq/tmdlITMDLsbyWria/tmdl-wriaO8.html 1/2
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Jurgens Residence Addition Wetland Mitigation Plan
Since it is not possible to develop outside of the standard or reduced wetland buffers at 2301
Jones Ave NE, the project can only occur with approval of a Reasonable Use variance that
includes the following proposed wetland mitigation plan to increase the functions of the buffer
over current conditions.
Per the Wetland Study Report provided by Altmann Oliver Associates dated 07/08/2019, the
wetland buffer area that is associated with the proposed project does not currently provide any
functional benefit to the wetland. The area of the proposed project currently consists entirely
of existing gravel parking and no significant vegetation would be removed as part of the
project.
Referencing the Wetland Mitigation Site Plan, due to the location of the existing structure,
significant trees, Kennydale Creek, steep slope, septic field and existing vegetation, the addition
must be constructed within the wetland buffer to the north of the existing single family
structure. This is also the most ideal location for the project, in that it is located on an existing
impervious gravel surface and no additional pollution generating surfaces would be created,
thus no hydrologic impacts to the wetland.
In order to improve the condition of the wetland buffer, the proposed project includes
removing approximately 2,250 SF of gravel driveway adjacent to the south edge of the wetland
and replacing with grass. This square footage of buffer restoration is greater than a 1:1 ratio in
comparison to the 1,523 net square footage of the proposed addition. Additionally, a row of 15
native Western Red Cedar trees have recently been planted along the south edge of the
wetland (trees are not part of this mitigation plan, but rather a recent improvement to the
wetland buffer). In whole, these plantings will provide a physical and visual screen to the
wetland and will increase the habitat and protection functions of the buffer over current
conditions.
Regarding protection of the wetland during construction, all construction activities and storage
would be located upon existing gravel driveway and parking areas. Care will also be exercised to
limit and/or restrict usage of those areas nearby the wetland, creek, and tree drip lines.
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Altmann Oliver Associates, LLC AOA
PO Box 578 Carnation, WA 98014 Office (425) 333-4535 Fax (425) 333-4509
July 8, 2019
Steve Jurgens
Sjurgens22@gmail.com
SUBJECT: Wetland and Stream Review for Jurgens Property
2301 Jones Ave. NE, Parcel 334450-0210
Renton, WA
Dear Steve:
Environmental
Planning &
Landscape
Architecture
AOA -5910
On May 21, 2019 1 conducted a wetland and stream reconnaissance on the subject
property utilizing the methodology outlined in the May 2010 Regional Supplement to
the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys,
and Coast Region (Version 2.0). The site is currently developed with your existing
residence, gravel parking areas, and yard. Kennydale Creek flows from southeast to
northwest through the yard in the northeast corner of the site.
One wetland (Wetland A) was observed along the creek within a broad topographic
swale immediately off-site to the north. The southern boundary of the wetland in the
vicinity of your north property line was delineated with pink flagging numbered A-1
through A-6 during the site review.
Wetland A and Kennydale Creek
Wetland A consists of a Riverine Hydrogeomorphic (HGM) class wetland containing
a forested plant community that included black cottonwood (Populus trichocarpa),
red alder (Alnus rubra), Pacific willow (Salix lasiandra), salmonberry (Rubus
spectabilis), Himalayan blackberry (Rubus armeniacus), lady fern (Athyrium filix-
femina), and skunk cabbage (Lysichiton americanum). Hydrologic support to the
wetland appears to be from both groundwater seepage and overbank flooding.
Wetland A was determined to meet the criteria for a Category I I wetland with 4
Habitat Points (Attachment A). Category II wetlands with 4 Habitat Points require a
standard 100 -foot buffer and 15 -foot building setback per RMC 4-3-050.G.2. It is my
understanding that Kennydale Creek is considered a Type Np stream and requires a
standard 75 -foot buffer plus 15 -foot building setback.
Steve Jurgens
July 8, 2019
Page 2
Existing Wetland and Stream Functions and Values
Wetlands, in general, provide many valuable ecological and social functions,
including stormwater storage, water quality protection, groundwater recharge
and discharge, and wildlife habitat. Wetland A has the capacity to provide
many of these functions. Although limited, the wetland does provide some
stormwater storage that helps reduce downstream flooding while also
trapping sediments. The trapping of sediments and other pollutants within
the wetland maintains water quality in downstream areas and aids in the
prevention of fish habitat degradation by limiting silt accumulation within
spawning areas. The wetland provides further benefit to fish and other
wildlife by releasing water slowly during the dry summer months, thereby
contributing to the base flow of the stream.
In addition to its hydrologic functions, the wetland also provides biological functions.
The wetland provides habitat for a variety of wildlife species typical of suburban
habitats within the Puget Sound lowlands. Another important biologic function of the
wetland is the transport of nutrients to downstream areas. Nutrients transported to
downstream areas provide biological support for fish and other aquatic wildlife.
The wetland does provide some limited cultural wetland functions as part of
the overall open space corridor associated with Kennydale Creek.
Proposed Project
It is my understanding that you are proposing an addition to your single-
family residence. Due to the location of the existing structure, the addition
must be constructed within the buffer to the north of the house. The area of
the proposed expansion currently consists entirely of existing gravel parking
and no significant vegetation would be removed as part of your proposed
project.
The buffer area associated with your proposed expansion does not currently
provide any functional benefit to the wetland and stream. It is also my
understanding that as part of the project you are proposing to plant a variety
of native tree and shrub species along the north property line and adjacent
Kennydale Creek to increase the plant species and structural diversity of the
buffers. These plantings would provide a physical and visual screen to the
wetland and stream from the residence and would increase the habitat and
protection functions of the buffer over current conditions.
Since there should be no increase in pollution generating surfaces
associated with the project, there are no anticipated hydrologic impacts to
the wetland.
Steve Jurgens
July 8, 2019
Page 3
Recommendation
Since it is not possible to develop the expansion outside of the standard or reduced
buffers on the site, the project can only occur utilizing an alternate buffer that meets
all of the criteria outlined in RMC 4-3-050.G.9.d.ii. These criteria include the
preparation of a buffer enhancement planting plan that would demonstrate an
increase in the functions of the buffer over current conditions.
It is my recommendation that a meeting be held with the City of Renton Planning
Department to determine whether an alternate buffer would likely be approved prior
to the preparation of detailed site plans.
If you have any questions, please call me at (425) 333-4535.
Sincerely,
ALTMANN OLIVER ASSOCIATES, LLC
John Altmann
Ecologist
Attachments
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Wetland name or number A
RATING SUMMARY — Western Washington
Name of wetland (or ID #): 334450-0210
Date of site visit: 5/21/2019
Rated by Altmann Trained by Ecology?21 YesE] No Date of training 03/08 & 03/15
HGM Class used for rating Riverine & Fresh Water Tidal Wetland has multiple HGM classes? 21 Yes ❑ No
NOTE: Form is not complete with out the figures requested (figures can be combined).
Source of base aerial photo/map King County iMAP
OVERALL WETLAND CATEGORY II (based on functions o or special characteristics El )
1. Category of wetland based on FUNCTIONS
Category I - Total score = 23 - 27
X Category II - Total score = 20 - 22
Category III - Total score = 16 - 19
Category IV - Total score = 9 - 15
2. Category based on SPECIAL CHARACTERISTICS of wetland
CHARACTERISTIC
Improving
Hydrologic
Habitat
FUNCTION
Bog
Mature Forest
Water Quality
Old Growth Forest
Coastal Lagoon
List appropriate rating (H, M, L)
Site Potential
M
H
L
Landscape Potential
H
H
L
Value
H
M
M Total
Score Based on
8
8
4 20
Ratings
2. Category based on SPECIAL CHARACTERISTICS of wetland
CHARACTERISTIC
Category
Estuarine
Wetland of High Conservation Value
Bog
Mature Forest
Old Growth Forest
Coastal Lagoon
Interdunal
None of the above
X
Score for each
function based
on three
ratings
(order of ratings
is not
important)
9=H,H,H
8=H,H,M
7=H,H,L
7=H,M,M
6=H,M,L
6=M,M,M
5=H,L,L
5=M,M,L
4=M,L,L
3=L,L,L
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015 1 WSDOT Adapted Form - January 14, 2015
Wetland name or number A
RIVERINE AND FRESHWATER TIDAL FRINGE WETLANDS
Water Quality Functions - Indicators that the site functions to improve water quality
R 1.0. Does the site have the potential to improve water quality?
R 1.1. Area of surface depressions within the Riverine wetland that can trap sediments during a
1
flooding event:
1
Depressions cover > 3/4 area of wetland points = 8
2
Depressions cover >'/2 area of wetland points = 4
Depressions present but cover <'/2 area of wetland points = 2
1
No depressions present points = 0
R 1.2. Structure of plants in the wetland (areas with >90% cover at person height, not Cowardin
2
classes)
0
Trees or shrubs > 2/3 area of the wetland points = 8
° Trees or shrubs >'/3 area of the wetland points = 6
8
° Herbaceous plants (> 6 in high) > 2/3 area of the wetland points = 6
Herbaceous plants (> 6 in high) >'/3 area of the wetland points = 3
Trees, shrubs, and ungrazed herbaceous <'/3 area of the wetland points = 0
Total for R 1 Add the points in the boxes abovel
10
Rating of Site Potential If score is: El 12 -16 = H o 6 - 11 = M ° 0 - 5 = L Record the rating on the first page
R 2.0. Does the landscape have the potential to support the water quality function of the site?
R2.1. Is the wetland within an incorporated city or within its UGA? Yes = 2 No = 0
2
R 2.2. Does the contributing basin to the wetland include a UGA or
1
incorporated area? Yes = 1 No = 0
1
R 2.3. Does at least 10% of the contributing basin contain tilled fields,
0
pastures, or forests that have been clearcut within the last 5 years? Yes = 1 No = 0
R 2.4. Is > 10% of the area within 150 ft of the wetland in land uses that
1
generate pollutants? Yes = 1 No = 0
R 2.5. Are there other sources of pollutants coming into the wetland that are
2
not listed in questions R 2.1 - R 2.4?
0
Other Sources Yes = 1 No = 0
Total for R 2 Add the points in the boxes above
4
Rating of Landscape Potential If score is: 0 3 - 6 = H ° 1 or 2 = M ° 0 = L Record the rating on the first page
R 3.0. Is the water quality improvement provided by the site valuable to society?
R 3.1. Is the wetland along a stream or river that is on the 303(d) list or on a
1
tributary that drains to one within 1 mi? Yes = 1 No = 0
R 3.2. Is the wetland along a stream or river that has TMDL limits for nutrients,
1
toxics, or pathogens? Yes = 1 No = 0
R 3.3. Has the site been identified in a watershed or local plan as important for
maintaining water quality? (answer YES if there is a TMDL for the drainage in
0
which the unit is found) Yes = 2 No = 0
Total for R 3 Add the points in the boxes above
2
Rating of Value If score is: 0 2 - 4 = H ° 1 = M ° 0 = L
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015
Record the rating on the first page
5 WSDOT Adapted Form - January 14, 2015
Wetland name or number A
RIVERINE AND FRESHWATER TIDAL FRINGE WETLANDS
Hydrologic Functions - Indicators that site functions to reduce flooding and stream erosion
R 4.0. Does the site have the potential to reduce flooding and erosion?
R 4.1. Characteristics of the overbank storage the wetland provides:
Estimate the average width of the wetland perpendicular to the direction of the flow and the width
of the stream or river channel (distance between banks). Calculate the ratio: (average width of
1
wetland)/(average width of stream between banks).
If the ratio is more than 20 points = 9
6
If the ratio is 10 - 20 points = 6
If the ratio is 5 - < 10 points = 4
0
If the ratio is 1 - < 5 points = 2
If the ratio is < 1 points = 1
1
R 4.2. Characteristics of plants that slow down water velocities during floods: Treat large woody
debris as forest or shrub. Choose the points appropriate for the best description (polygons need
to have >90% cover at person height. These are NOT Cowardin classes).
Forest or shrub for >'/3 area OR emergent plants > 2/3 area points = 7
7
Forest or shrub for >'/10 area OR emergent plants >'/3 area points = 4
Plants do not meet above criteria points = 0
Total for R 4 Add the points in the boxes abovel
13
Rating of Site Potential If score is: 0 12 -16 = H El 6 - 11 = M El 0 - 5 = L Record the rating on the first page
R 5.0. Does the landscape have the potential to support the hydrologic functions of the site?
R 5.1. Is the stream or river adjacent to the wetland downcut? Yes = 0 No = 1 1
R 5.2. Does the up -gradient watershed include a UGA or incorporated area? Yes = 1 No = 0 1
R 5.3 Is the up -gradient stream or river controlled by dams? Yes = 0 No = 1 1
Total for R 5 Add the points in the boxes above 3
Rating of Landscape Potential If score is: 0 3 = H L1 1 or 2 = M 01 0 = L Record the rating on the first page
R 6.0. Are the hydrologic functions provided by the site valuable to society?
R 6.1. Distance to the nearest areas downstream that have flooding problems?
Choose the description that best fits the site.
The sub -basin immediately down -gradient of the wetland has
flooding problems that result in damage to human or natural
1
resources (e.g., houses or salmon redds) points = 2
Surface flooding problems are in a sub -basin farther down -gradient points = 1
No flooding problems anywhere downstream points = 0
R 6.2. Has the site been identified as important for flood storage or flood
0
conveyance in a regional flood control plan? Yes = 2 No = 0
Total for R 6 Add the points in the boxes above
1
Rating of Value If score is: El 2- 4= H o 1= M El 0= L
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015
Record the rating on the first page
6 WSDOT Adapted Form - January 14, 2015
Wetland name or number A
These questions apply to wetlands of all HGM classes.
HABITAT FUNCTIONS - Indicators that site functions to provide important habitat
H 1.0. Does the site have the potential to provide habitat?
H 1.1. Structure of plant community: Indicators are Cowardin classes and strata within the
Forested class. Check the Cowardin plant classes in the wetland. Up to 10 patches may be
combined for each class to meet the threshold of % ac or more than 10% of the unit if it is smaller
than 2.5 ac. Add the number of structures checked.
Aquatic bed 4 structures or more: points = 4
1
o Emergent 3 structures: points = 2
Scrub -shrub (areas where shrubs have > 30% cover) 2 structures: points - 1
o Forested (areas where trees have > 30% cover) 1 structure: points = 0
If the unit has a Forested class, check if:
Q The Forested class has 3 out of 5 strata (canopy, sub -canopy, shrubs, herbaceous,
moss/ground-cover) that each cover 20% within the Forested polygon
H 1.2. Hydroperiods
Check the types of water regimes (hydroperiods) present within the wetland. The water regime
has to cover more than 10% of the wetland or'/4 ac to count (see text for descriptions of
hydroperiods ).
Permanently flooded or inundated 4 or more types present: points = 3
Seasonally flooded or inundated 3 types present: points = 2
2
o Occasionally flooded or inundated 2 types present: points = 1
ID Saturated only 1 types present: points = 0
o Permanently flowing stream or river in, or adjacent to, the wetland
Seasonally flowing stream in, or adjacent to, the wetland
El Lake Fringe wetland 2 points
o Freshwater tidal wetland 2 points
H 1.3. Richness of plant species
Count the number of plant species in the wetland that cover at least 10 ft2.
Different patches of the same species can be combined to meet the size threshold and you do not
have to name the species. Do not include Eurasian milfoil, reed canarygrass, purple
loosestrife, Canadian thistle
1
If you counted: > 19 species points = 2
5 - 19 species points = 1
< 5 species points = 0
H 1.4. Interspersion of habitats
Decide from the diagrams below whether interspersion among Cowardin plants classes
(described in H 1.1), or the classes and unvegetated areas (can include open water or mudflats)
is high, moderate, low, or none. If you have four or more plant classes or three classes and open
water, the rating is always high.
o a
0
None = 0 points Low = 1 point Moderate = 2 points
All three diagrams
in this row are
HIGH = 3 points
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015 7 WSDOT Adapted Form - January 14, 2015
vvetlano name or numoer A
H 1.5. Special habitat features:
Check the habitat features that are present in the wetland. The number of checks is the number
of points.
o Large, downed, woody debris within the wetland (> 4 in diameter and 6 ft long)
o Standing snags (dbh > 4 in) within the wetland
Undercut banks are present for at least 6.6 ft (2 m) and/or overhanging plants extends
at least 3.3 ft (1 m) over a stream (or ditch) in, or contiguous with the wetland, for at
least 33 ft (10 m) 2
❑ Stable steep banks of fine material that might be used by beaver or muskrat for denning
(> 30 degree slope) OR signs of recent beaver activity are present (cut shrubs or trees
that have not yet weathered where wood is exposed)
❑ At least'/ ac of thin -stemmed persistent plants or woody branches are present in areas
that are permanently or seasonally inundated (structures for egg -laying by amphibians)
❑ Invasive plants cover less than 25% of the wetland area in every stratum of plants (see
H 1.1 for list of strata)
Total for H 1 Add the points in the boxes abovel 6
Rating of Site Potential If Score is: ❑ 15 - 18 = H ❑ 7 -14 = M o 0 - 6 = L Record the rating on the first page
H 2.0. Does the landscape have the potential to support the habitat function of the site?
H 2.1 Accessible habitat (include only habitat that directly abuts wetland unit).
Calculate:
0 % undisturbed habitat + ( 0.03 % moderate & low intensity land uses / 2) = 0.015%
If total accessible habitat is:
0
>'/3 (33.3%) of 1 km Polygon points = 3
20 - 33% of 1 km Polygon points = 2
10 - 19% of 1 km Polygon points = 1
1
< 10 % of 1 km Polygon points = 0
H 2.2. Undisturbed habitat in 1 km Polygon around the wetland.
Calculate:
12.8 % undisturbed habitat + ( 15.1 % moderate & low intensity land uses / 2) = 20.35%
watershed plan
2
Undisturbed habitat > 50% of Polygon points = 3
Undisturbed habitat 10 - 50% and in 1-3 patches points = 2
Undisturbed habitat 10 - 50% and > 3 patches points = 1
Undisturbed habitat < 10% of 1 km Polygon points = 0
H 2.3 Land use intensity in 1 km Polygon: If
> 50% of 1 km Polygon is high intensity land use points = (-2)
-2
<_ 50% of 1 km Polygon is high intensity points = 0
Total for H 2 Add the points in the boxes above
0
Rating of Landscape Potential If Score is: ❑ 4 - 6 = H ❑ 1 - 3 = M o < 1 = L Record the rating on the first page
H 3.0. Is the habitat provided by the site valuable to society?
H 3.1. Does the site provide habitat for species valued in laws, regulations, or policies? Choose
only the highest score that applies to the wetland being rated.
Site meets ANY of the following criteria: points = 2
❑ It has 3 or more priority habitats within 100 m (see next page)
❑ It provides habitat for Threatened or Endangered species (any plant
or animal on the state or federal lists)
❑ It is mapped as a location for an individual WDFW priority species
1
❑ It is a Wetland of High Conservation Value as determined by the
Department of Natural Resources
❑ It has been categorized as an important habitat site in a local or
regional comprehensive plan, in a Shoreline Master Plan, or in a
watershed plan
Site has 1 or 2 priority habitats (listed on next page) with in 100m points = 1
Site does not meet any of the criteria above points = 0
Rating of Value If Score is: ❑ 2 = H o 1 = M ❑ 0 = L
Wetlani9 Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015 8
Record the rating on the first page
WSDOT Adapted Form - January 14, 2015
Wetland name or number A
WDFW Priority Habitats
Priority habitats listed by WDFW (see complete descriptions of WDFW priority habitats, and the counties in
which they can be found, in: Washington Department of Fish and Wildlife. 2008. Priority Habitat and Species
List. Olympia, Washington. 177 pp.
http://wdfw.wa.gov/publications/00165/wdfw00165.pdf or access the list from here:
http://wdfw.wa.gov/conservation/phs/list/
Count how many of the following priority habitats are within 330 ft (100 m) of the wetland unit: NOTE: This
question is independent of the land use between the wetland unit and the priority habitat.
0 Aspen Stands: Pure or mixed stands of aspen greater than 1 ac (0.4 ha).
o Biodiversity Areas and Corridors: Areas of habitat that are relatively important to various species of
native fish and wildlife (full descriptions in WDFW PHS report).
E] Herbaceous Balds: Variable size patches of grass and forbs on shallow soils over bedrock.
° Old-growth/Mature forests: Old-growth west of Cascade crest — Stands of at least 2 tree species,
forming a multi -layered canopy with occasional small openings; with at least 8 trees/ac (20 trees/ha)
> 32 in (81 cm) dbh or > 200 years of age. Mature forests — Stands with average diameters
exceeding 21 in (53 cm) dbh; crown cover may be less than 100%; decay, decadence, numbers of
snags, and quantity of large downed material is generally less than that found in old-growth; 80-200
years old west of the Cascade crest.
Oregon White Oak: Woodland stands of pure oak or oak/conifer associations where canopy
coverage of the oak component is important (full descriptions in WDFW PHS report p. 158 — see web
link above).
ID Riparian: The area adjacent to aquatic systems with flowing water that contains elements of both
aquatic and terrestrial ecosystems which mutually influence each other.
Westside Prairies: Herbaceous, non -forested plant communities that can either take the form of a
dry prairie or a wet prairie (full descriptions in WDFW PHS report p. 161 — see web link above).
Instream: The combination of physical, biological, and chemical processes and conditions that
interact to provide functional life history requirements for instream fish and wildlife resources.
Nearshore: Relatively undisturbed nearshore habitats. These include Coastal Nearshore, Open
Coast Nearshore, and Puget Sound Nearshore. (full descriptions of habitats and the definition of
relatively undisturbed are in WDFW report — see web link on previous page).
Caves: A naturally occurring cavity, recess, void, or system of interconnected passages under the
earth in soils, rock, ice, or other geological formations and is large enough to contain a human.
E] Cliffs: Greater than 25 ft (7.6 m) high and occurring below 5000 ft elevation.
Talus: Homogenous areas of rock rubble ranging in average size 0.5 - 6.5 ft (0.15 - 2.0 m),
composed of basalt, andesite, and/or sedimentary rock, including riprap slides and mine tailings. May
be associated with cliffs.
Snags and Logs: Trees are considered snags if they are dead or dying and exhibit sufficient decay
characteristics to enable cavity excavation/use by wildlife. Priority snags have a diameter at breast
height of > 20 in (51 cm) in western Washington and are > 6.5 ft (2 m) in height. Priority logs are > 12
in (30 cm) in diameter at the largest end, and > 20 ft (6 m) long.
Note: All vegetated wetlands are by definition a priority habitat but are not included in this list because they are
addressed elsewhere.
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015 9 WSDOT Adapted Form - January 14, 2015
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8/25/2018 TMDL Project Information for WRIA 8 1 WA State Department of Ecology
lhftp://www.ecy.wa.gov:80/programs/wq/tmd[fTMDLsbyWria/tmdl-wriaO8.html F—Go-1 NOV MAi, OCT Q 0
15 captures i 30 ♦ E
26 Jul 2009 - 24 Oct 2017 2015 1017 2018 W -
>� DEPARTMENT OF
ECOLOGY
State of Washington
Home Water Quality & Supply
Figure D
Waste & Toxics
Water Quality Improvement > Water Quality Improvement Projects by WRIA > WRIA 8: Cedar-Sammamish
WRIA 8: Cedar-Sammamish
The following table lists overview information for water quality improvement
projects (including total maximum daily loads, or TMDLs) for this water resource
inventory area (WRIA). Please use links (where available) for more information on
a project.
Counties
• King,
Snohomish
Air & Climate
Waterbody Name
Pollutants
Status**
TMDL Lead
Ballinger Lake
Total Phosphorus
Approved by EPA
Tricia Shoblom
425-649-7288
Bear -Evans Creek Basin
Fecal Coliform
Approved by EPA
Joan Nolan
425-649-4425
Dissolved Oxygen
Approved by EPA
Temperature
Cottage Lake
Total Phosphorus
Approved by EPA
Tricia Shoblom
Has an implementation
425-649-7288
plan
Issaquah Creek Basin
Fecal Coliform
Approved by EPA
Joan Nolan
425-649-4425
Little Bear Creek
Fecal Coliform
Approved by EPA
Moh EKdL9k
Tributaries:
425-649-7036
Trout Stream
Great Dane
Creek
Cutthroat
Creek
North Creek
Fecal Coliform
Approved by EPA
1WW SvrjQ1
Has an implementation
425-649-7036
plan
Pipers Creek
Fecal Coliform
Approved by EPA
Joan Nolan
425-649-4425
Sammamish River
Dissolved Oxygen
Field work starts summer
Ralph Svrjcek
Temperature
2015
425-649-7036
Swamp Creek
Fecal Coliform
Approved by EPA
Ralph SvrjLek
Has an implementation
425-649-7036
plan
* * Status will be listed as one of the following: Approved by EPA, Under Development or Implementation
For more information about WRIA 8:
• Waterbodies in WRIA 8 - using the Water Quality Assessment Query Tool
Watershed Information for WRIA 8
* The Department of Ecology and other state resource agencies frequently use a system of 62 "Water Resource Inventory Areas" or
"WRIAs" to refer to the state's major watershed basins.
About us I Contact us
http://web.archive.org/web/20170330212555/http:/Www.ecy.wa.gov:801programs/wq/tmdlITMDLsbyWria/tmdl-wriaO8.html 1/2
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