11-104074Inc.
Sewall Weuand
27641 Covington Way SE #2
Covington, WA 98042
September 21. 2011
Alexey Ancheyev
1926 Lighthouse Lane NE
Tacoma, Washington 98422
RE: Critical Area Report - Parcel #4166600647
City of Federal Way, Washington
SWC Job # 11-136
Dear Alexey,
Phone:253-859-0515
Fax:253-852-4732
FILE
This report describes our observations of any jurisdictional wetlands,
streams and buffers on or within 200' of Parcel #4166600647 in the City
of Federal Way, Washington (the "site").
Above: Vicinity Map of the site.
PERMIT #: 11-104074-00 Si
ADDRESS: 3 0 yQ g2141 AAF, SN/
PRbJECT: New Single Famip
1NTERPLAST- LAKCTA
DATE: 1016111
RECEIVED
OCT 0.6 2011
CITY OF FEDERAL WAY
CDS
f � w
f Ancheyev/#11-136
Sewall Wetland Consulting, Inc.
September 21, 2011
Page 2
The total area of this irregular shaped parcel is 29,152sf. The site is
undeveloped and consists primarily of fallow pasture and shrub
dominated areas that have been historically graded into a flat site. The
site is located along the north side of 28+h Avenue SW just east of its
intersection with 30th Avenue NW and SW 304+h Street.
METHODOLOGY
Ed Sewall of Sewall Wetland Consulting, Inc. inspected the site on June
9, 2011. The site was reviewed using methodology described in the
Washington State Wetlands Identification Manual (WADOE, March
1997). This is the methodology currently recognized by the City of Federal
Way and the State of Washington for wetland determinations and
delineations. The site was also reviewed using the methodology
described in the Corps of Engineers Wetlands Delineation Manual
(Environmental Laboratory, 1987), and the Western Mountains, Valleys
and Coast region Supplement (Version 2.0) dated June 24, 2010, as
required by the US Army Corps of Engineers. Soil colors were identified
using the 1990 Edited and Revised Edition of the Munsell Soil Color
Charts (Kollmorgen Instruments Corp. 1990) .
The Washington State Wetlands Identification and Delineation Manual and
the Corps of Engineers Wetlands Delineation Manual both requires the use
of the three -parameter approach in identifying and delineating wetlands.
A wetland should support a predominance of hydrophytic vegetation,
have hydric soils and display wetland hydrology. To be considered
hydrophytic vegetation, over 50% of the dominant species in an area
must have an indicator status of facultative (FAC), facultative wetland
(FACW), or obligate wetland (OBL), according to the National List of Plant
Species That Occur in Wetlands: Northwest (Region 9) (Reed, 1988). A
hydric soil is "a soil that is saturated, flooded, or ponded long enough
during the growing season to develop anaerobic conditions in the upper
part". Anaerobic conditions are indicated in the field by soils with low
chromas (2 or less), as determined by using the Munsell Soil Color
Charts; iron oxide mottles; hydrogen sulfide odor and other indicators.
Generally, wetland hydrology is defined by inundation or saturation to
the surface for a consecutive period of 12.5% or greater of the growing
season. Areas that contain indicators of wetland hydrology between 5%-
12.5% of the growing season may or may not be wetlands depending
upon other indicators. Field indicators include visual observation of soil
Ancheyev/# 11- 13 6
Sewall Wetland Consulting, Inc.
September 21, 2011
Page 3
inundation, saturation, oxidized rhizospheres, water marks on trees or
other fixed objects, drift lines, etc. Under normal circumstances,
indicators of all three parameters will be present in wetland areas.
Wetland flags were located with a handheld Garmin gps and transferred
to the site map.
OBSERVATIONS
Existing Site Documentation.
Prior to visiting the site, a review of several natural resource inventory
maps was conducted. Resources reviewed included the National Wetland
Inventory Map and the NRCS Soil Survey online mapping and the Federal
Way Critical Areas Map.
Soil Survey
According to data on file with the NRCS Soil Survey, the site is mapped
primarily as Indianola loamy fine sand. Indianola soils are somewhat
excessively drained soils formed under conifers in glacial drift material.
The northern tip of the site is mapped as Alderwood gravelly sandy loam
(map unit AgC)). Neither of these soils is considered wetland or hydric
soils.
Map Unit Map Unit Name ~ _
symbol
AkF Alderwood and �:•.
Kitsap soils; very 4ti,
steep
InC Indianola loamy
.-
fine sand; 4 to
15 percent
slopes
Above: USDA Soil Survey Map of the site
Anchevev/#11-136
Sewall Wetland Consulting, Inc.
September 21, 2011
Page 4
National Wetlands Inventory (NWI)
According to the NWI map for the site, there are no wetlands or streams
mapped on the site or anywhere within 1/4 mile of the site.
Above: National Wetlands Inventory Map of the site.
City of Federal Way 1-24-2001 Response Inquiry
A letter response to Mr. Kim Kim dated January 24, 2011, identifies a
Category III wetland on the property as well as the property adjacent to
the north. The letter also indicates there is Major Stream mapped on the
property to the north.
City of Federal Way Critical Areas Map
According to the City of Federal Way Critical Areas map, there is a
wetland along the north and western side of the site. There is also a
mapped stream off -site to the north of the site.
l
Anchevev/# 11-136
Sewall Wetland Consulting, Inc.
September 21, 2011
Page 5
Above: Federal Way Critical Areas Map. Note green wetland on the site as
well as stream (blue line) indicated off -site to the north.
Field observations
The site is a generally flat but terraced with the higher portion of the site
being the eastern 2 / 3rds and the western 1/3 lower by approximately 6'
in elevation. The site appears to have been graded historically and is a
mix of native and fill type soil material. Vegetation on the site is
primarily grasses and blackberry thickets with some alders along the
northern edge. Species found on the majority of the site include
bluegrass, velvet grass and orchard grass.
Soil pits excavated throughout the upland portion of the site reveal high
chroma, mixed fill soils as well as some darker soils that appear to be
imported material.
Wetland
A forested and emergent slope/depressional type wetland is located along
the north and west sides of the site. This wetland was flagged with flags
Al-A7. This wetland is vegetated with a mix of velvet grass and reed
canary grass in the emergent portion, and pacific willow, red alder and
red -osier dogwood in the forested portion.
Soil bits excavated within the wetland revealed a mottled sandv clay loam
withya soil color of 2.5Y 3/2 with redoximorphic concentrations. Soils
were saturated within 12" of the surface along the edge during our site
inspection.
Anchevev/#11-136
Sewall Wetland Consulting, Inc.
September 21, 2011
Page 6
Using the US Fish and Wildlife Wetland Classification system (Cowardin
et al. 1979) this wetland contains areas that would be classified as
PFOIE (palustrine, forested, broad leaved deciduous, saturated) and
PEM 1 C (palustrine, emergent, persistent, seasonally flooded) .
This wetland was rated using the Washington State Wetlands rating form'
for Western Washington (WADOE 2004) as a depressional- wetland. �Ze
wetland received a total score of 42 points with -1.8 points for habitat: --
This indicates a Category 3 wetland. Category 3- wetlands in Federal Way
typically have a 50' buffer measured from the wetland edge for a
moderate land use such as a single family home. In addition, a 15'
building setback line is measured from the wetland buffer edge.
Streams
There is a stream located approximately 50' north of the site. According
to City correspondence this is a Major Stream. Major Streams typically
have a 100' buffer measured from the OHWM. This stream is located
within the wetland flagged on the site and the wetland buffer exceeds any
buffer from this strm--n so this was not depicted on the site plan.
Proposed Project
The proposed project is the construction of a single family home and
associated driveway. All work is located outside the wtlpmd. as well.,&
its associated 5a' h £er as we as to 100' buffer of the.v f--site Major.
Stream.
If you have any questions in regards to this report or need additional
information, please feel free to contact me at (253) 859-0515 or at
esewal]Ca sewallwc . com .
Sincerely,
Sewall Wetland Consulting, Inc.
Ed Sewall
Senior Wetlands Ecologist PWS #212
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