HomeMy WebLinkAboutWetland Delineation 942300053E
Land Services
Wetland Delineation Report
for the
Thorndyke Road Property
Port Ludlow, Washington
Prepared for:
Linda Rosario
PO Box 2790
Poulsbo, WA 98370
(360) 620-3202
Prepared by:
Ecological Land Services, Inc.
1157 3rd Avenue, Suite 220A
Longview, Washington 98632
(360)578-1371
Project Number 2506.01
March 6, 2017
JUN 2 9 2017-`
JEFFERSON COON""' "" LICE)
TABLE OF CONTENTS
INTRODUCTION.................................................................................................................................1
METHODOLOGY...............................................................................................................................1
SITEDESCRIPTION..........................................................................................................................1
VEGETATION...................................................................................................................................2
SOILS................................................................................................................................................3
HYDROLOGY....................................................................................................................................3
NATIONALWETLAND INVENTORY.................................................................................................3
JEFFERSONCOUNTY CRITICAL AREAS...........................................................................................4
CONCLUSIONS..................................................................................................................................4
WETLANDCATEGORIZATION..................................................................................................... 4
STREAMTYPING.......................................................................................................................... 4
CRITICAL AREA REGULATIONS.................................................................................................. 4
SITE DEVELOPMENT PROPOSAL AND BUFFER REDUCTION PROCESS ....................................... 4
REFERENCES....................................................................................................................................6
FIGURES & PHOTOPLATES
Figure 1
Vicinity Map
Figure 2
Site Map
Figure 3
Survey Map
Figure 4
Soil Survey Map
Figure 5
National Wetlands Inventory Map
Figure 6
Jefferson County Critical Areas Map
Figure 7
Wetland Rating Form- 15 0'Offset
Figure 8
Wetland Rating Form -1 KM Offset
Figure 9
Wetland Rating Form -303(d) and TMDL
Photoplates
Site Photos
APPENDIX A
Wetland Determination Data Forms
APPENDIX B
Western Washington Wetland Rating Form
Linda Rosario-Thomdyke Road Delineation Ecological Land Services, Inc.
Wetland Delineation Report i March 6, 2017
SIGNATURE PAGE
The information and data in this report were compiled and prepared under the supervision and
direction of the undersigned.
Laura Westervelt
Biologist
Linda Rosario-Thomdyke Road Delineation Ecological Land Services, Inc.
Wetland Delineation Report ii March 6, 2017
INTRODUCTION
Ecological Land Services, Inc. (ELS) was contracted by Linda Rosario to complete a wetland
delineation and report for the property on Thorndyke Road, parcel number 942300053, in Port
Ludlow, Washington. The property is within a portion of Section 19, Township 27 North, Range 1
East of the Willamette Meridian, in Port Ludlow, Jefferson County, Washington (Figure 1). This
report summarizes the findings of the wetland delineation according to the Jefferson County
Unified Development Code, Chapter 18.22, Critical Areas (JCUDC) for delineation methodology,
wetland categorization, and required buffer widths.
METHODOLOGY
The wetland categorization followed the Routine Determination Method according to the U.S.
Army Corps of Engineers, Wetland Delineation Manual (Environmental Laboratory 1987) and the
Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains,
Valleys and Coast Region, Version 2.0 (U.S. Army Engineer Research and Development Center,
2010).
The Routine Determination Method examines three parameters—vegetation, soils, and
hydrology—to determine if wetlands exist in a given area. Hydrology is critical in determining
what is wetland, but is often difficult to assess because hydrologic conditions can change
periodically (hourly, daily, or seasonally). Consequently, it is necessary to determine if
hydrophytic vegetation and hydric soils are present, which would indicate that water is present for
long enough duration to support a wetland plant community. By definition, wetlands are those
areas that are inundated or saturated by surface or ground water 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 are regulated as "Waters of the
United States" by the U.S. Army Corps of Engineers (USAGE), as "Waters of the State" by the
Washington Department of Ecology (Ecology), and locally by Jefferson County.
To determine the presence or absence of wetlands on the property, ELS biologists collected data on
vegetation, hydrology, and soils. During the site visit on February 8, 2017, one wetland was
identified along the west property line. Most of the wetland unit is offsite, but crosses onto the
west property line. Vegetation, hydrology, and soil data was collected at two test plots to verify the
wetland boundary and characterize site conditions (Appendix A). The delineation and test plot
flags were located using a Trimble handheld Global Positioning System (GPS) with sub -meter
accuracy in order to show the limits of the wetland on the site map (Figure 2).
SITE DESCRIPTION
The 2.57 -acre property is situated north of Thorndyke Road in south Port Ludlow in Jefferson
County, Washington. The square property is relatively level but slopes down gently from east to
west. The driveway enters the southeast property corner and extends north along the high east side
to an open area in the north half of the property (Photoplate 1). Outside the clearing, the property
is dominated by an even -aged stand of upland forest vegetation with a sparse shrub layer and well -
Linda Rosario-Thomdyke Road Delineation
Wetland Delineation Report
Ecological Land Services, Inc.
March 6, 2017
developed herbaceous layer (Photoplate 4). The open area is being used as a summer destination
outfitted with a small shed, fire pit, and camping areas.
The wetland identified onsite is locally known ,as Thorndyke Lake, which lays mostly offsite to the
north. The wetland crosses the west edge of the property beginning at the northwest property
corner and ending at the toe of the grade of Thorndyke Road at the south end (Figure 2)
(Photoplates 2 and 3). Thorndyke Lake is a large, round, depressional system with scrub/shrub,
emergent, and aquatic bed vegetation classes, and areas of permanently and seasonal flooding.
Generally, surface water onsite will drain from east to west and into the wetland at the west
property line. During the wet season, the wetland is filled by a seasonally perched water table as
well as surface runoff from the surrounding forestland. There is also a permanently flowing stream
that flows into the wetland from the northeast. There is no outlet at the south end of the wetland
which may be the cause of the extreme flooded condition observed during the site visit.
VEGETATION
Thorndyke Lake is a scrub/shrub, emergent, and aquatic bed unit. The shrub cover was thickest in
the south finger of the wetland and around the edges of the round portion (Figure 5). The wetland
vegetation was dominated by black cottonwood (Populus balsamifera spp. trichocarpa, FAC) and
red alder (Alnus rubra, FAC) in the tree layer, with some overhanging cover of Douglas fir
(Pseudotsuga menziesh, FACU) trees that were rooted in the upland. The shrub layer was
dominated by black twinberry (Lonicera involucrata, FACW) and salmonberry (Rubus spectabilis,
FAC). Pacific crab apple (Malus fusca, FACW) and red osier dogwood (Cornus sericea, FAC)
were also observed growing in the deep water portion of the wetland. The herbaceous layer was
not recorded due to the depth of water in the wetland; however slough sedge (Carex obnupta,
OBL) was growing around the fringes of the water.
The upland plot was recorded in the open area of the property and only represents those conditions.
The upland plot was dominated by lawn grasses and hairy cat's ear (Hypochaeris radicata, FACU).
The grasses were not identified because they had no seed heads to use in identification. The
surrounding upland forest was dominated by Douglas fir, bigleaf maple (Acer macrophyllum,
FACU), Oregon grape (Mahonia nervosa, FACU), salal (Gaultheria shallon, FACU), sword fern
(Polystichum munitum, FACU), and trailing blackberry (Rubus ursinus, FACU).
The dominant vegetation found onsite is recorded on the attached wetland determination data
forms (Appendix A). The indicator status, following the common and scientific names, indicates
how likely a species is to be found in wetlands. Listed from most likely to least likely to be found
in wetlands, the indicator status categories are:
• OBL (obligate wetland) — Almost always occur in wetlands.
• FACW (facultative wetland) — Usually occur in wetlands, but may occur in non -wetlands.
• FAC (facultative) — Occur in wetlands and non -wetlands.
■ FACU (facultative upland) — Usually occur in non -wetlands, but may occur in wetlands.
• UPL (obligate upland) — Almost never occur in wetlands.
■ NI (no indicator) — Status not yet determined.
Linda Rosario-Thomdyke Road Delineation Ecological Land Services, Inc.
Wetland Delineation Report 2 March 6, 2017
SOILS
As referenced on the U.S.D.A. Natural Resources Conservation Service (NRCS 2015) website, the
soil mapped on the property is Alderwood gravelly sandy loam, 0 to 15 percent slopes (A1C)
(Figure 3). Alderwood soils are not classified as hydric (NRCS 2015). The adjacent wetland area
is mapped with McMurray and Mukilteo peats (Mm), which are classified as hydric. Areas
mapped as hydric soils do not necessarily mean that an area is or is not a wetlandhydrology,
hydrophytic vegetation, and hydric soils must all be present to classify an area as a wetland.
The soil was not evaluated in the wetland due to the depth of inundation. The boundary dropped
off steeply, resulting in the water becoming very deep very quickly. As a result, no soil data could
be collected. The presence of hydric soil is assumed due to the hydric soil map units and the
permanently flooded hydrologic regime.
The evaluated upland soil consisted of gravelly sandy loam with brown (10YR 2/2) matrix colors.
The layer below this brown color was entire composed of charcoal and the color was not
determined. The upland test plot did not meet hydric indicators because it lacked a depleted layer
and redoximorphic features. The color and texture observed in the upland test plot is relatively
consistent with the description of Alderwood gravelly sandy loam mapped on the soil survey.
HYDROLOGY
The wetland was inundated during the February 2017 site visit and flooded beyond the wetland
boundary. The wetland is confined to the depressional topography but is subject to extreme
flooding due to a lack of outlet. Water drains from surrounding upland areas towards the wetland,
particularly at the northeast corner, where the permanently flowing stream drains into the wetland.
The primary source of hydrology to the wetland is a seasonally perched water table, but surface
water runoff and direct precipitation are also contributing. Water leaves the wetland by percolating
into the soils and evapotranspiration through vegetation. Hydrology was not present in the upland
test plot.
NATIONAL WETLAND INVENTORY
The National Wetlands Inventory (NWI) maps Thorndyke Lake as a palustrine, persistent emergent
and scrub/shrub, semi -permanently and seasonally flooded system (Figure 4). The map does not
show the wetland extending as far south as it was delineated. The ELS delineation confirms that
the mapped wetland exists as shown except that it extends south to the toe of Thorndyke Road
along the west property line. The actual wetland hydroperiods are also slightly different than
indicated on the NWI map. The NWI maps should be used with discretion because they are used
to gather general wetland information about a regional area and therefore are limited in accuracy
for smaller areas because of their large scale.
Linda Rosario-Thorndyke Road Delineation Ecological Land Services, Inc.
Wetland Delineation Report 3 March 6, 2017
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JEFFERSON COUNTY CRITICAL AREAS
The Jefferson County Critical Areas map (JC 2015) also indicates the presence of Thomdyke Lake
in a similar orientation to the NWI (Figure 5). The mapped wetland extends farther south than the
NWI shows and does not extend onto the property as determined through the delineation. The ELS
delineation confirmed the wetland in the approximate location shown on the map.
CONCLUSIONS
WETLAND CATEGORIZATION
The Thomdyke Wetland is situated in a deep depression among forest timberland with a narrow
finger extending south to the toe of Thomdyke Road along the west line of this property. It was
rated according to Washington State Wetlands Rating System for Western Washington -2014
Update (Rating System) (Hruby 2014). The wetland scored 16 points on the rating form and is
considered a Depressional, Category III wetland based on functions (Appendix B).
STREAM TYPING
The stream channel was not observed during the field visit due to property ownership. The stream
does appear on some online tools. According to the WDFW Forest Practices map tool, the stream
meets the definition of a Type Np water, where the "N" indicates non -fish -bearing and the "p"
indicates that the channel is permanently flowing.
CRITICAL AREA REGULATIONS
The JCUDC Chapter 18.22.330 Wetland Protection Standards specifies wetland buffers based on
proposed land use intensity, wetland category, and scores for habitat on the rating form. The
project involves building a single-family home in the northeastern portion of the open area, which
meets the criteria in JCUDC for moderate intensity land use (<1 dwelling unit/acre). The required
buffer width is 75 feet wide. A 15 -foot building and impervious surface setback is also specified
from the edge of wetland buffers.
SITE DEVELOPMENT PROPOSAL AND BUFFER REDUCTION PROCESS
The JCUDC allows buffer reductions for projects that cannot be constructed outside the required
wetland and/or stream buffer widths. Buffer reduction options include averaging wherein one area
of buffer is reduced and another is increased so that the average buffer width matches the regulated
buffer width. A second option is a 25 -percent reduction, which requires improvement of the buffer
through enhancement of vegetation to provide a buffer that functions as good as or better than the
buffer at the required width. The project proposes building a single-family home near the northeast
corner of the property, which is already open and used as a family camping area. The building site
is ideal because it is located at the end of the existing driveway, it is in an open area and it is as far
from the wetland boundary as possible. The drainfield is proposed directly south of the home
location and also lies within the open area. There will be minimal removal of vegetation required
to achieve the project goals. The wetland buffer only extends into the open area to the existing
shed and will not be impacted by onsite activities. The new home and septic drainfield is proposed
outside the 75 -foot wetland buffer and the 15 -foot building and impervious setback. No buffer
reduction or averaging is proposed at this time.
Linda Rosario-Thomdyke Road Delineation Ecological Land Services, Inc.
Wetland Delineation Report 4 March 6, 2017
LIMITATIONS
The conclusions listed above are based on standard scientific methodology and best professional
judgment. In our opinion, local, state, and federal regulatory agencies should agree with our
conclusions; however, this should be considered a preliminary jurisdictional determination and
should be used at your own risk until it has been reviewed and approved in writing by the
appropriate regulatory agencies.
Linda Rosario-Thomdyke Road Delineation
Wetland Delineation Report
5
Ecological Land Services, Inc.
March 6, 2017
REFERENCES
Cowardin, L.M., C. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and
Deepwater Habitats of the United States. FWS/OBS-78/31. U.S. Department of the Interior,
Fish and Wildlife Service, Office of Biological Services, Washington D.C.
Environmental Laboratory. 1987. Corps of Engineers Wetlands Delineation Manual, Technical
Report Y-87-1. U.S. Army Corps of Engineer Waterways Experiment Station, Vicksburg,
Mississippi.
Hruby, T. August 2014. Washington State Wetland Rating System for Western Washington, 2014
Update. Washington State Department of Ecology Publication #14-06-029. Olympia,
Washington. Effective January 1, 2015.
Jefferson County. jMAP - Environmentally Sensitive Areas Website.
lio:/In}aps.co.Leffsxson.wa.usfWebsite/mspub/viewer.htm?mapset=esa.
Website accessed March 2017.
Jefferson County Unified Development Code, Chapter 18.22 Critical Areas. 2005. Jefferson
County, Washington.
U.S. Army Corps of Engineers (USAGE). 2010. Regional Supplement to the Corps of Engineers
Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region (Version 2.0),
ed. J.S. Wakeley, R.W. Lichvar, and C.V. Noble. ERDC/EL TR -08-13. Vicksburg, Mississippi:
U.S. Army Engineer Research and Development Center.
U.S. Fish & Wildlife Service. 2015. National Wetlands Inventory. Online document
<http://www.fws.gov/wetlands/Data/Mapper.html>. Website accessed March 2017.
U.S.D.A. Natural Resource Conservation Service (NRCS). 2015. WA635 Kitsap County Area.
Online document <Iittp://www.oi-.nres.usda.gov/piiw soilAk :l_repor€s.html>. Website accessed
March 2017.
U.S.D.A. Natural Resource Conservation Service (NRCS). 2012. Washington Hydric Soils List.
<http: //www.nres.usdagoov/wps/portallnres/main/soilsluselh_ydricl>.
Linda Rosario-Thomdyke Road Delineation Ecological Land Services, Inc.
Wetland Delineation Report 6 March 6, 2017
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1. THIS SURVEY WAS PERFORMED BY FIELD TRAVERSE METHODS USING A I SECOND
TOPCON CTS-JIJ IDEAL STATION AND STEEL TAPE.
7. AW WS/$ Of SEA9VIG AND SECTION SOO&WSION DAK SEC m%. 10 Of SURVEYS,
�S.AND VO,. J OF SURVEYS PA" 163, Rf"ftS Or JEFFER5PY COUNTY,
J. THIS SURVEY DOES Nor PURPORT TO SNOW THE EXISTENCE OF ALL EASEMENTS
ANO/,ENCUMBRANCES RECORDED OR UNRECORDED THAT MAY AFFECT THIS
A• THIS SURVEY WAS PERFORMED ACCORDING TO WAC JJ2-150-090 STANDARDS FOR
LAND BOUNDARY SURVEYS. THIS SURVEY WAS NOT PERFORMED OR CERTIFIED TO
MEET THE CURRENT MINIMUM STANDARD REOUIREMENTS" OR ACCURACY
STANDARDS" FOR ALTA/ACSM LAND TITLE SURVEYS.
5 THE FIELD WORM' FOR $US PROUECr WAS CLMT 1N fESREWY 2000, BUT WAS
INAOVERTENF1V NOT RECORDED, INE CO N67S SWWN AS SET ON THIS SURVEY
WERE RECOVERED AND THEIR POSITIONS VERIFIED ON 10/31105.
AUDITOR'S CFJ?77nCA7_c
FRED FOR RECORD nKs DIY Or 4005,
AF-j3L_L. M., AN fleT^M" OF $~M ON PACE )k.. AT THE
REOUESr OF KfNNEIH A CLARK
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Freshwater Emergent WetlandCD
J
Estuarine and Marine Wetland
Freshwater Pond
Riverine
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Legend
Towns Wetlands
*
COU -1y �-:A FEMA FIRMS (Flood Maps)
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ant Stroams 0111
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Category Iii
Depression ai
S cru b/sh to b.
Emergent & K.
Surfaces, Aquatic Bed
4'ermenentty Hooded
SITE Seasonally Flooded e
Permanenhy Flowing Stmt
13 Rating
Description
Answers specific to Wetland A
Question
'6
C)
U')
Wetland A
Depressional
ani D 1.1, D 4.1
(Location of Outlet
Wetland has no outlet
a
ID 1.3
(Distribution of persistent plants
Persistent, ungrazed plants > 1/10 of area
D. 1.4
Area of seasonally flooded
Area seasonally ponded < 1/10 of the wetland
ID 2.2
Boundary of area w/in 150' of the
<10% of the area within 150' in land uses that generate pollutants?
wetland in land uses that generate
pollutants
ID 5.2
Boundary of area w/in 150' of the
<10% of the area within 150' in land use that generate excess runoff?
wetland in land uses that generate
excess runoff
u -i ID 4.3
Contributing Basin -Contribution of
Basin is less than 10 times the area of the unit
wetland to storage in the watershed
ID 5.3
Contributing Basin covered in intensive
<25% of the area of the basin covered with intensive land uses
E
land uses
IH 1.1
Cowardin Plant Classes
_
Scrub/shrub, Emergent, Aquatic bed
and
Z IH 1.2
Hydroperiods
Permanently flooded, Seasonally flooded, and
Permanently flowing stream
N 1.4
Interspersion of habitats
Moderate Interspersion of habitat
NOTE(S):
1. Aerial photo from Google Earth TM
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Wetland Unit Boundary W - E
150' Wetland Offset
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c Wetland Unit Boundary N j
4 — — Contributing Basin Y
},� k Accessible Habitat (5.5%)
U Undisturbed Habitat (68.9% *Includes Accessible Habitat) LL
w H High Intensity Land Use (6.3%) w
J
M Moderate/Low Intensity Land Use (22.2% *Includes MA) 0
MA Moderate/Low Intensity Land Use Directly Abutting Wetland (2.2%)
z:
N
H 2.1 - Accessible habitat is < 10% of 1 km Polygon (6.6%).
H 2.2 - Undisturbed habitat > 50% of Polygon (80.0%).
H 2.3 - <50% of polygon is high land use intensity.
0)
7t
CO W E
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o NOTE(S):
1. Aerial photo from Google Earth TM
Figure 9a -303(d) Map: There is a stream flowing into the Thorndyke Wetland appearing on the 303(d) list.
Figure 9b: TMDL List for Jefferson County. There are no TMDLS for this watershed.
Figure 9 -Wetland Rating
1157 Yd Ave., Suite 220A
DATE: 2/27/17
Form-303(d)/TMDL
*oag
Longview, WA 98632
DWN: LHW
Project Name: Thorndyke
I
Phone: (360) 578-1371
Fax: 414-9305
PRJ. MGR
Road Delineation
Client: Linda Rosario
Land Services
(360)
PROJ.#: 2506.01
06
Jefferson County,
Washington
ir.
all
Photo 1 was taken from the end
of the driveway where it enters
the open area of the property. It
looks south towards Thorndyke
Road.
K:v
Photo 2 was taken from
approximately the same
location as Photo 1 facing west
into the open area. The small
shed occurs at the southwest
corner of the cleared area. The
lawn area in front of the shed
was being utilized as a fire pit
and camping area.
Photo 3 was taken from the
same location as Photo 2 facing
northwest. It looks toward the
proposed building site at the
end of the driveway.
ra DATE: 2/8/17 Photoplate 1
46&6\�1157 3 Ave., Suite 220A Project Name: Thorndyke
Longview, WA 98632 DWN: LHW
(57Road Property
ECWoikc�a 1 360) 78-131 PRJ. MGR JB Fax: (360) 578-9371 PRM 2506.Client: Linda Rosario
Land Services 01 Jefferson County, Washington
Photo 4 was taken from near the
. �.
no property corner, where
the open area meets the wetland
F ' `- .r boundary, looking north. The
.- wetland continues north from
here and widens into an open
water pond, called Thorndyke
Lake.
Photo 5 was taken from the
same location as Photo 4 facing
west into the wetland. The
shrub layer was thick and
diverse in this portion of the
wetland.
Photo 6 was taken from the
same location as Photos 4 and
5 facing south. It shows the
transition from upland forest
(left side) to wetland
vegetation (right side) and the
amount of flooding that was
present during the site visit.
ra
1157 3 Ave., Suite 220A
DATE: 2/8/17
Photoplate 2
Project Name: Thorndyke
Longview, WA 98632
DWN: L14W
Road Property
Eta 1[a� (360) 578-1371
PRJ. MGR JB
Client: Linda Rosario
Land Servicos Fax: (360) 414-9305
PROJ.#: 2506.01
Jefferson County, Washington
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Ec'o1ical
Land Services
Photo 7 was taken from near the
southwest property corner, where
the wetland meets the toe of
Thorndyke Road, looking north.
Most of the scrub/shrub areas of
wetland occurred in the portion
that crosses the west edge of the
property.
Photo 8 was taken from the
same location as Photo 7 facing
west into the wetland. There is
no outlet from the wetland,
causing flooded conditions
each season.
Photo 9 was taken from the
same location as Photos 7 and
8 facing south. It looks at the
southern extent of the wetland
which ends at the toe of the
Thorndyke Road grade. There
is no culvert beneath the road
to allow water to drain to
Thorndyke Bay.
�a
1157 3 Ave., Suite 220A
DATE: 2/8/17
Photoplate 3
Project Name: Thorndyke
Longview, WA 98632
DWN: LHW
Road Property
(360) 578-1371
PRJ. MGR JB
Client: Linda Rosario
Fax: (360) 414-9305
PROJI: 2506.01
Jefferson County, Washington
Photo 10 was taken from near the
southwest property corner, below
�> Thorndyke Road, looking south.
The grade of Thorndyke Road is
visible in the background.
Photo 11 was taken from the
same location as Photo 10 facing
southeast. Upland vegetation is
dominated by Douglas fir, red
huckleberry, and sword fern.
Photo 12 was taken from the
same location as Photos 10 and
11 facing east. There were no
other wetlands found onsite. The
driveway entrance is visible in
the left background.
ra
1157 3 Ave., Suite 220A
DATE: 2/8/17
Photoplate 4
Project Name: Thorndyke
Longview, WA 98632
DWN: LHW
Road Property
' (360) 578-1371
E a
PRJ. MGR JB
Client: Linda Rosario
Land Services Fax: (360) 414-9305
PROJ.#: 2506.01
Jefferson County, Washington
APPENDIX A
WETLAND DETERMINATION DATA FORM — Western Mountains, Valleys, and Coast Region
Project Site: Thwndvke 92ad Protsprlg City/County: Pori LudlowlieHerson Sampling Date: 2-8-17
ApplicantlOwner: Linda Rosas State: WA Sampling Point: TP 1
Investigator(s): L, arvett Section, Township, Range: $. j,4T 27N_R'IEWM
Landform (hillslope, terrace, etc.): terrace Local relief (concave, convex, none): convex Slope (%): 2-5°/
Subregion (LRR): MLRA 2 Lat: Long: Datum: N/A
Soil Map Unit Name: Alderwood gravelly sandy loam. 0 to 15 percent slopesALC! NW I classification:
Are climatic / hydrologic conditions on the site typical for this time of year? Yes ® No ❑ (If no, explain in Remarks.)
Are Vegetation ❑, Soil ❑, or Hydrology ❑, significantly disturbed? Are "Normal Circumstances' present? Yes ® No ❑
Are Vegetation ❑, Soil ❑, or Hydrology ❑, naturally problematic? (If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS — Attach site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present? Yes ® No ❑
Hydric Soil Present? Yes ❑ No ® Is the Sampled Area Yes El No
within a Wetland?
Wetland Hydrology Present? Yes ❑ No ED
Remarks: The forested property has an open area of lawn used to summer camping. The upland forest is dominated by Douglas fir, bigleaf maple, and sword fern.
The wetland, locally known as Thorndyke Lake, is a large, round, depressional wetland occuring mostly offsite to the north. It extends onsite along the west
property boundary. Test Plot 1 is located in the open lawn area east of the wetland boundary.
VEGETATION — Use scientific names of plants
Tree Stratum (Plot size: 29 diameter)
1.
2.
3.
4.
50% = 20% _
Saolinq/$hrub_$tratum (Plot size: 2V diameter)
1.
2.
3.
4.
5.
50% _ , 20% _
Herb Stratum (Plot size: V diameter)
1. Mown grass'
2. Hyuoehaerrs radicato
3.
4.
5.
6.
7.
8.
9.
10.
11.
50% = 50,20% = 20
Woody Vine Stratum (Plot size: )
1.
2.
50% = 20% _
% Bare Ground in Herb Stratum 0
Absolute Uommant Indicator
% Cover S cies Status
= Total Cover
= Total Cover
90 y9S FAC
10 no FACU
100 = Total Cover
= Total Cover
Dominance Test Worksheet:
Number of Dominant Species 1 (A)
That Are OBL, FACW, or FAC:
Total Number of Dominant 1 (B)
Species Across All Strata:
Percent of Dominant Species 100 (A/B)
That Are OBL, FACW, or FAC:
Prevalence Index worksheet:
Total % Cover of: Multiply by:
OBL species x1 =
FACW species x2 =
FAC species x3 =
FACU species x4 =
UPL species x5 =
Column Totals: (A) (B)
Prevalence Index = B/A
Hydrophytic Vegetation Indicators:
❑ 1 — Rapid Test for Hydrophytic Vegetation
® 2 - Dominance Test is >50%
❑ 3 - Prevalence Index is <3.0'
❑ 4 - Morphological Adaptations' (Provide supporting
data in Remarks or on a separate sheet)
❑ 5 - Wetland Non -Vascular Plants'
❑ Problematic Hydrophytic Vegetation' (Explain)
'Indicators of hydric soil and wetland hydrology must
be present, unless disturbed or problematic.
Hydrophytic
Vegetation
Present?
i
Yes U No ❑
Remarks: The hydrophytic vegetation criterion is met because there is greater than 50% dominance by FAC species.
Mown grass was not identified because there were no seed heads. It was assumed to be FAC.
US Army Corps of Engineers Western Mountains, Valleys, and Coast — Version 2.0
Project Site: Thflmd a Road Property
SOIL
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches) Color (moist) % Color (moist) % Type' Loc? Texture
0-10 10YR 212 100_ - rg sa to
10-16
Point:
Remarks
No radoxkmor aphic features
Charcoal
of - gravelly
sa - sendy
to - loam
Type: C= Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. ?Location: PL=Pore Lining, M=Matrix, RC=Root Channel
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)
Indicators for Problematic Hydric Soils':
❑
Histosol (Al)
❑
Sandy Redox (S5)
❑ 2 cm Muck (A10)
❑
Histic Epipedon (A2)
❑
Stripped Matrix (S6)
❑ Red Parent Material (TF2)
❑
Black Histic (A3)
❑
Loamy Mucky Mineral (F1) (except MLRA 1)
❑ Very Shallow Dark Surface (TF12)
❑
Hydrogen Sulfide (A4)
❑
Loamy Gleyed Matrix (F2)
❑ Other (Explain in Remarks)
❑
Depleted Below Dark Surface (A11)
❑
Depleted Matrix (F3)
❑
Thick Dark Surface (Al2)
❑
Redox Dark Surface (176)
❑
Sandy Mucky Mineral (S1)
❑
Depleted Dark Surface (F7)
31ndicators of hydrophytic vegetation and
wetland hydrology must be present,
❑
Sandy Gleyed Matrix (S4)
❑
Redox Depressions (F8)
unless disturbed or problematic.
Restrictive Layer (if present):
Type:
Depth (inches): Hydric Soils Present? Yes ❑
Remarks: This soil profile contains a dark surface layer and lacks redoximorphic features. Therefore none of the hydric soil indicators are met.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)
Water -Stained Leaves (139)
(except MLRA 1, 2,4A, and 4B)
Salt Crust (B11)
Aquatic Invertebrates (1313)
Hydrogen Sulfide Odor (Cl)
Oxidized Rhizospheres along Living Roots (C3)
Presence of Reduced Iron (C4)
Recent Iron Reduction in Tilled Soils (C6)
Stunted or Stresses Plants (131) (LRR A)
Other (Explain in Remarks)
❑ Surface Water (Al)
❑ High Water Table (A2)
❑ Saturation (A3)
❑
Water Marks (B1)
❑ Sediment Deposits (132)
❑ Drift Deposits (63)
❑ Algal Mat or Crust (134)
❑ Iron Deposits (B5)
❑ Surface Soil Cracks (136)
❑ Inundation Visible on Aerial Imagery (67)
❑ Sparsely Vegetated Concave Surface (138)
Field Observations:
Surface Water Present? Yes ❑ No
Water Table Present? Yes ❑ No
Saturation Present? Yes ❑ No
(includes capillary fringe)
❑ti
® Depth (inches):
® Depth (inches):
® Depth (inches):
No
Secondary Indicators (2 or more required)
❑ Water -Stained Leaves (139)
(MLRA 1, 2,4A, and 4B)
❑ Drainage Patterns (1310)
❑ Dry -Season Water Table (C2)
❑ Saturation Visible on Aerial Imagery (C9)
❑ Geomorphic Position (D2)
❑ Shallow Aquitard (133)
❑ FAC -Neutral Test (D5)
❑ Raised Ant Mounds (D6) (LRR A)
❑ Frost -Heave Hummocks (137)
Wetland Hydrology Present? Yes ❑ No
Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks: Hydrology was not present during the site visit and there was no evidence to indicate wetland hydrology.
US Army Corps of Engineers
Western Mountains, Valleys, and Coast— Version 2.0
WETLAND DETERMINATION DATA FORM — Western Mountains, Valleys, and Coast Region
Project Site: Thorndit Road Property City/County: Pori LudlowlJefi rson Sampling Date: 2-8-17
Applicant/Owner: Linda Rosarlo State: WA Sampling Point: TP 2
Investigator(s): i-Wa t; nrval( Section, Township, Range: S 19 T 27N R 1EWM
Landform (hillslope, terrace, etc.): terrace Local relief (concave, convex, none): convex Slope (%): 2-5%
Subregion (LRR): MLRA 2 Let: Long: Datum: TrImIal
Soil Map Unit Name: McMurry and M kip _ Ileo peals Wire NW I classification: PEMH
Are climatic / hydrologic conditions on the site typical for this time of year? Yes ® No ❑ (If no, explain in Remarks.)
Are Vegetation ❑, Soil ❑, or Hydrology ❑, significantly disturbed? Are "Normal Circumstances" present? Yes ® No ❑
Are Vegetation ❑, Soil ❑, or Hydrology ®, naturally problematic? (If needed, explain any answers in Remarks.)
SUMMARY OF FINDINGS - Attach site map showing sampling point locations, transects, important features, etc.
Hydrophytic Vegetation Present? Yes 0 No ❑
Hydric Soil Present?Yes ® No ❑ Is the Sampled Area Yes ® No ❑
within a Wetland?
Wetland Hydrology Present? Yes 0 No ❑
Remarks: The forested property has an open area of lawn used to summer camping The upland forest is dominated by Douglas fir, bigleaf maple, and sword fern.
The wetland, locally known as Thorndyke Lake, is a large, round, depressional wetland occuring mostly offsite to the north. It extends onsite along the west
property boundary. Test Plot 2 is located in the flooded area of the Thorndyke Wetland west of Test Plot 1. The soil is assumed hydric based on flooded
conditions and the hydric soil map unit.
VEGETATION - Use scientific names of plants
Tree Stralum (Plot size: 20' diameter)
1. Pupulus balsamifera spp. tdchocerpe
2. Aldus rubra
3.
4.
50% = 15,20% = 6
Sapling§hrub Siralum (Plot size: 20' diamatQr)
1. Rubus specfabilis
2. Lonicara inyplucrala
3.
4.
5.
50% = 40, 20% = 16
Herb Siratum (Plot size: $' diameter)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
50% _ , 20% _
Woody Vine Stratum (Plot size: )
1.
2,
50%=,20%=
% Bare Ground in Herb Stratum 100"'
Absolute Uommant Indicator
% Cover Species? Status
20 rimes FAC
10 yes FAC
30 = Total Cover
60 Yes FAC
20 yes FACW
80 = Total Cover
= Total Cover
Dominance Test Worksheet:
Number of Dominant Species
That Are OBL, FACW, or FAC:
Total Number of Dominant
Species Across All Strata:
Percent of Dominant Species
That Are OBL, FACW, or FAC:
Prevalence Index worksheet:
Total % Cover of: Multioly by.
OBL species x1 =
FACW species x2 =
FAC species x3 =
FACU species x4 =
UPL species x5 =
Column Totals: (A) (B)
Prevalence Index = B/A =
Hydrophytic Vegetation Indicators:
❑ 1 - Rapid Test for Hydrophytic Vegetation
® 2 - Dominance Test is >50%
❑ 3 - Prevalence Index is <3.0'
El data
- Morphological Adaptations' (Provide supporting
data in Remarks or on a separate sheet)
❑ 5 - Wetland Non -Vascular Plants'
❑ Problematic Hydrophytic Vegetation' (Explain)
'Indicators of hydric soil and wetland hydrology must
be present, unless disturbed or problematic.
1 (A)
1 (B)
100 (A/B)
I Hydrophytic
Vegetation Yes
=Total Cover Present?
Remarks: The hydrophytic 'vegetation criterion is met because there is greater than 50% dominance by FAC and FACW species.
"" The wetland was entirely flooded and the bare ground is actually standing water.
No ❑
I
US Army Corps of Engineers Western Mountains, Valleys, and Coast- Version 2.0
Project Site: Thorndyke Road PMpft[,y
SOIL
Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.)
Depth Matrix Redox Features
(inches) Color (moist) % Color (moist) % Type' Loc' Texture
Point:
Remarks
'Type: C= Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. 'Location: PL=Pore Lining, M=Matrix, RC=Root Channel
Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)
Indicators for Problematic Hydric Soils3:
❑ Histosol (Al)
❑
Sandy Redox (S5)
❑
2 cm Muck (A10)
❑ Histic Epipedon (A2)
❑
Stripped Matrix (S6)
❑
Red Parent Material (TF2)
❑ Black Histic (A3)
❑
Loamy Mucky Mineral (F1) (except MLRA 1)
❑
Very Shallow Dark Surface (TF12)
❑ Hydrogen Sulfide (A4)
❑
Loamy Gleyed Matrix (F2)
®
Other (Explain in Remarks)
❑ Depleted Below Dark Surface (A11)
❑
Depleted Matrix (F3)
❑ Thick Dark Surface (Al2)
❑
Redox Dark Surface (F6)
❑ Sandy Mucky Mineral (S1)
❑
Depleted Dark Surface (F7)
❑ Sandy Gleyed Matrix (S4)
❑
Redox Depressions (F8)
Restrictive Layer (if present):
Type:
31ndicators of hydrophytic vegetation and
wetland hydrology must be present,
unless disturbed or Droblematic.
Depth (inches): I Hydric Soils Present?
Yes ® No ❑
Remarks: Soil was not sampled in the wetland due to the depth of standing water. The soil was therefore assumed to be hydric due to the prevelance of wetland
vegetation and hydrology as well as the presumption that the hydric soil mapping in Thorndyke Lake extends along the remainder of the wetland.
HYDROLOGY
Wetland Hydrology Indicators:
Primary Indicators (minimum of one required; check all that apply)
® Surface Water (Al) ❑ Water -Stained Leaves (139)
❑ High Water Table (A2) (except MLRA 1, 2,4A, and 4B)
❑ Saturation (A3) ❑ Salt Crust (1511)
❑ Water Marks (151) ❑ Aquatic Invertebrates (613)
❑ Sediment Deposits (152) ❑ Hydrogen Sulfide Odor (C1)
❑ Drift Deposits (63) ❑ Oxidized Rhizospheres along Living Roots (C3)
❑ Algal Mat or Crust (154) ❑ Presence of Reduced Iron (C4)
❑ Iron Deposits (155) ❑ Recent Iron Reduction in Tilled Soils (C6)
❑ Surface Soil Cracks (136) ❑ Stunted or Stresses Plants (D1) (LRR A)
❑ Inundation Visible on Aerial Imagery (157) ❑ Other (Explain in Remarks)
❑ Sparsely Vegetated Concave Surface (156)
Field Observations:
Surface Water Present? Yes ® No ❑ Depth (inches): 2 feet+
Water Table Present? Yes ❑ No ® Depth (inches):
Secondary Indicators (2 or more required)
❑ Water -Stained Leaves (159)
(MLRA 1, 2,4A, and 4B)
❑ Drainage Patterns (610)
❑ Dry -Season Water Table (C2)
❑ Saturation Visible on Aerial Imagery (C9)
❑ Geomorphic Position (D2)
❑ Shallow Aquitard (D3)
❑ FAC -Neutral Test (D5)
❑ Raised Ant Mounds (D6) (LRR A)
❑ Frost -Heave Hummocks (137)
Saturation Present. Yes ❑ No ® Depth (inches): Wetland Hydrology Present?
(includes capillary fringe)
Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available:
Remarks: Hydrology was present during the site visit observed as standing water in the wetland.
US Army Corps of Engineers
Yes ® No ❑
Western Mountains, Valleys, and Coast— Version 2.0
APPENDIX B
Wetland name or number Thorndyke Lake
RATING SUMMARY — Western Washington
Name of wetland (or ID #): Thorndyke Lake Date of site visit: 2/8/2017
Rated by J. Bartlett Trained by Ecology? X Yes No Date of training 11/2014
HGM Class used for rating Depressional Wetland has multiple HGM classes? --Y X N
NOTE: Form is not complete without the figures requested (figures can be combined).
Source of base aerial photo/map Google Earth
OVERALL WETLAND CATEGORY III (based on functions X or special characteristics__)
1. Category of wetland based on FUNCTIONS
Category I —Total score = 23 — 27
Category II — Total score = 20 — 22
X Category III — Total score = 16 —19
Category IV — Total score = 9 — 15
FUNCTION Improving Hydrologic Habitat
I Water Quality
Circle the appropriate ratings
Site Potential H M L H M L H M L
Landscape Potential H M L H M L H M L
Value H M L H M L H M L TOTAL
Score Based on 5 6 5 16
Ratings
2. Category based on SPECIAL CHARACTERISTICS of wetland
CHARACTERISTIC CATEGORY
Estuarine
I II
Wetland of High Conservation Value
I
Bog
I
Mature Forest
I
Old Growth Forest
I
Coastal Lagoon
I II
Interdunal
I II III IV
None of the above
X
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015
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
1
Wetland name or number Thorndyke Lake
Maps and figures required to answer questions correctly for
Western Washington
Depressional Wetlands
Map of:
Cowardin plant classes
To answer questions:
D 1.3, H 1.1, H 1.4
Figure #
2,7
Hydroperiods
D 1.4, H 1.2
2,7
Location of outlet (can be added to map of hydroperiods)
D 1.1, D 4.1
2,7
Boundary of area within 150 ft of the wetland (can be added to anotherfigure)
D 2.2, D 5.2
7
Map of the contributing basin
D 4.3, D 5.3
8
1 km Polygon: Area that extends 1 km from entire wetland edge - including
polygons for accessible habitat and undisturbed habitat
H 2. 1, H 2.2, H 2.3
8
Screen capture of map of 303(d) listed waters in basin (from Ecology website)
D 3.1, D 3.2
9
Screen capture of list of TMDLs for WRIA in which unit is found (from web)
D 3.3
9
Riverine Wetlands
f Map of:
To answer questions: Figure #
Cowardin plant classes
H 1.1, H 1.4 _
Hydroperiods
H 1.2
Ponded depressions
R 1.1
Boundary of area within 150 ft of the wetland (can be added to anotherfigure)
R 2.4
Plant cover of trees, shrubs, and herbaceous plants
R 1.2, R 4.2
Width of unit vs. width of stream (can be added to anotherfigure)
R 4.1
Map of the contributing basin
R 2.2, R 2.3, R 5.2
1 km Polygon: Area that extends 1 km from entire wetland edge - including
polygons for accessible habitat and undisturbed habitat
H 2.1, H 2.2, H 2.3
_
Screen capture of map of 303(d) listed waters in basin (from Ecology website)
R 3.1
Screen capture of list of TMDLs for WRIA in which unit is found (from web)
R 3.2, R 3.3
Lake Frinee Wetlands
Map of: To answer questions: Figure #
Cowardin plant classes
L 1.1, L 4.1, H 1.1, H 1.4
Plant cover of trees, shrubs, and herbaceous plants
L 1.2
Boundary of area within 150 ft of the wetland (can be added to anotherfigure)
L 2.2
1 km Polygon: Area that extends 1 km from entire wetland edge - including
polygons for accessible habitat and undisturbed habitat
H 2. 1, H 2.2, H 2.3
Screen capture of map of 303(d) listed waters in basin (from Ecology website)
L 3. 1, L 3.2
Screen capture of list of TMDLs for WRIA in which unit is found (from web)
L 3.3
Slope Wetlands
j Map of:
To answer questions: Figure #
Cowardin plant classes
H 1.1, H 1.4
Hydroperiods
H 1.2
Plant cover of dense trees, shrubs, and herbaceous plants
S 1.3
Plant cover of dense, rigid trees, shrubs, and herbaceous plants
(can be added to figure above)
S4.1
Boundary of 150 ft buffer (can be added to another figure)
S 2.1, S 5.1
1 km Polygon: Area that extends 1 km from entire wetland edge - including
polygons for accessible habitat and undisturbed habitat
H 2. 1, H 2.2, H 2.3
Screen capture of map of 303(d) listed waters in basin (from Ecology website)
S 3.1, S 3.2
Screen capture of list of TMDLs for WRIA in which unit is found (from web)
S3.3
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015
Wetland name or number Thorndyke Lake
HGM Classification of Wetlands in Western Washington
For questions 1-7, the criteria described must apply to the entire unit being rated.
If the hydrologic criteria listed in each question do not apply to the entire unit being rated, you
probably have a unit with multiple HGM classes. In this case, identify which hydrologic criteria in
questions 1-7 apply, and go to Question 8.
1. Are the water levels in the entire unit usually controlled by tides except during floods?
NO - go to 2 YES - the wetland class is Tidal Fringe - go to 1.1
1.1 Is the salinity of the water during periods of annual low flow below 0.5 ppt (parts per thousand)?
NO - Saltwater Tidal Fringe (Estuarine) YES - Freshwater Tidal Fringe
Ifyour wetland can be classified as a Freshwater Tidal Fringe use the forms for Riverine wetlands. If it
is Saltwater Tidal Fringe it is an Estuarine wetland and is not scored. This method cannot be used to
score functions for estuarine wetlands.
The entire wetland unit is flat and precipitation is the only source (>90%) of water to it. Groundwater
and surface water runoff are NOT sources of water to the unit.
NO - go to 3 YES - The wetland class is Flats
Ifyour wetland can be classified as a Flats wetland, use the form for Depressional wetlands.
Does the entire wetland unit meet all of the following criteria?
_The vegetated part of the wetland is on the shores of a body of permanent open water (without any
plants on the surface at any time of the year) at least 20 ac (8 ha) in size;
_At least 30% of the open water area is deeper than 6.6 ft (2 m).
NO - go to 4 YES - The wetland class is Lake Fringe (Lacustrine Fringe)
4. Does the entire wetland unit meet all of the following criteria?
The wetland is on a slope (slope can be verygradual),
The water flows through the wetland in one direction (unidirectional) and usually comes from
seeps. It may flow subsurface, as sheetflow, or in a swale without distinct banks,
The water leaves the wetland without being impounded.
NO-goto5
YES - The wetland class is Slope
NOTE: Surface water does not pond in these type of wetlands except occasionally in very small and
shallow depressions or behind hummocks (depressions are usually <3 ft diameter and less than 1 ft
deep).
5. Does the entire wetland unit meet all of the following criteria?
The unit is in a valley, or stream channel, where it gets inundated by overbank flooding from that
stream or river,
The overbank flooding occurs at least once every 2 years.
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015
Wetland name or number Thorndvke Lake
NO - go to 6 YES - The wetland class is Riverine
NOTE: The Riverine unit can contain depressions that are filled with water when the river is not
flooding
6. Is the entire wetland unit in a topographic depression in which water ponds, or is saturated to the
surface, at sometime during the year? This means that any outlet, if present, is higher than the interior
of the wetland.
NO-goto7
YES - The wetland class is Depressional
7. Is the entire wetland unit located in a very flat area with no obvious depression and no overbank
flooding? The unit does not pond surface water more than a few inches. The unit seems to be
maintained by high groundwater in the area. The wetland may be ditched, but has no obvious natural
outlet.
NO - go to 8 YES - The wetland class is Depressional
8. Your wetland unit seems to be difficult to classify and probably contains several different HGM
classes. For example, seeps at the base of a slope may grade into a riverine floodplain, or a small
stream within a Depressional wetland has a zone of flooding along its sides. GO BACK AND IDENTIFY
WHICH OF THE HYDROLOGIC REGIMES DESCRIBED IN QUESTIONS 1-7 APPLY TO DIFFERENT
AREAS IN THE UNIT (make a rough sketch to help you decide). Use the following table to identify the
appropriate class to use for the rating system if you have several HGM classes present within the
wetland unit being scored.
NOTE: Use this table only if the class that is recommended in the second column represents 10% or
more of the total area of the wetland unit being rated. If the area of the HGM class listed in column 2
is less than 10% of the unit; classify the wetland using the class that represents more than 90% of the
total area.
HGM classes within the wetland unit
being rated
HGM class to
use in rating
Slope + Riverine
Riverine
Slope + Depressional
Depressional
Slope + Lake Fringe
Lake Fringe
Depressional + Riverine along stream
within boundary of depression
Depressional
Depressional + Lake Fringe
Depressional
Riverine + Lake Fringe
Riverine
Salt Water Tidal Fringe and any other
class of freshwater wetland
Treat as
ESTUARINE
Ifyou are still unable to determine which of the above criteria apply to your wetland, or ifyou have
more than 2 HGM classes within a wetland boundary, classify the wetland as Depressional for the
rating.
Wetland Rating System for Western WA: 2014 Update 4
Rating Form - Effective January 1, 2015
Wetland name or number Thorndyke Lake
DEPRESSIONAL AND FLATS WETLANDS
Water Quality Functions - Indicators that the site functions to improve water quality
D 1.0. Does the site have the potential to improve water quality?
D 1.1. Characteristics of surface water outflows from the wetland:
3
Wetland is a depression or flat depression (QUESTION 7 on key) with no surface water leaving it (no outlet).
0
points = 3
0
Wetland has an intermittently flowing stream or ditch, OR highly constricted permanently flowing outlet.
0
points = 2
Wetland has an unconstricted, or slightly constricted, surface outlet that is permanently flowing points = 1
Wetland is a flat depression (QUESTION 7 on key), whose outlet is a permanently flowing ditch. points = 1
D 1.2. The soil 2 in below the surface (or duff layer) is true clay or true organic (use NRCS definitions). Yes = 4 No = 0
0
D 1.3. Characteristics and distribution of persistentplants (Emergent, Scrub -shrub, and/or Forested Cowardin classes):
0
Wetland has persistent, ungrazed, plants > 95% of area points = 5
Wetland has persistent, ungrazed, plants > % of area points = 3
Wetland has persistent, ungrazed plants > 1/roof area points= 1
Wetland has persistent, ungrazed plants <'/10 of area points = 0
D 1.4. Characteristics of seasonal ponding or inundation:
4
This is the area that is ponded for at least 2 months. See description in manual.
Area seasonally ponded is > %: total area of wetland points = 4
Area seasonally ponded is > % total area of wetland points = 2
Area seasonally ponded is < % total area of wetland points = 0
Total for D 1 Add the points in the boxes above
Rating of Site Potential If score is: 12-16 = H X 6-11= M �0-5 = L Record the rating on the first page
D 2.0. Does the landscape have the potential to support the water quality function of the site?
D 2.1. Does the wetland unit receive stormwater discharges? Yes = 1 No = 0
0
D 2.2. Is > 10% of the area within 150 ft of the wetland in land uses that generate pollutants? Yes = 1 No = 0
0
D 2.3. Are there septic systems within 250 ft of the wetland? Yes = 1 No = 0
0
D 2.4. Are there other sources of pollutants coming into the wetland that are not listed in questions D 2.1-D 2.3?
Source Yes = 1 No = 0
0
Total for D 2 Add the points in the boxes above
0
Rating of Landscape Potential If score is:3 or 4 = H 1 or 2 = M X 0 = L Record the rating on the first page
D 3.0. Is the water quality improvement provided by the site valuable to society?
D 3.1. Does the wetland discharge directly (i.e., within 1 mi) to a stream, river, lake, or marine water that is on the
303(d) list? Yes = 1 No = 0
0
D 3.2. Is the wetland in a basin or sub -basin where an aquatic resource is on the 303(d) list? Yes = 1 No = 0
1
D 3.3. Has the site been identified in a watershed or local plan as important for maintaining water quality (answer VES
if there is a TMDL for the basin in which the unit is found)? Yes = 2 No = 0
Total for D 3 Add the points in the boxes above
0
1
Rating of Value If score is: -2-4 = H X 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
Wetland name or number Thornd ke Lake
DEPRESSIONAL AND FLATS WETLANDS
Hydrologic Functions - Indicators that the site functions to reduce flooding and stream degradation
D 4.0. Does the site have the potential to reduce flooding and erosion?
D 4.1. Characteristics of surface water outflows from the wetland:
4
Wetland is a depression or flat depression with no surface water leaving it (no outlet) points = 4
0
Wetland has an intermittently flowing stream or ditch, OR highly constricted permanently flowing outletpoints = 2
0
Wetland is a flat depression (QUESTION 7 on key), whose outlet is a permanently flowing ditch points= 1
Wetland has an unconstricted, or slightly constricted, surface outlet that is permanently flowing points = 0
D 4.2. _Depth of storage during wet periods: Estimate the height of ponding above the bottom of the outlet. For wetlands
7
with no outlet, measure from the surface of permanent water or if dry, the deepest part.
Marks of ponding are 3 ft or more above the surface or bottom of outlet points = 7
Marks of ponding between 2 ft to < 3 ft from surface or bottom of outlet points = 5
Marks are at least 0.5 ft to < 2 ft from surface or bottom of outlet points = 3
0
The wetland is a "headwater" wetland points = 3
Wetland is flat but has small depressions on the surface that trap water points = 1
1
Marks of ponding less than 0.5 ft (6 in) points = 0
D 4.3. Contribution of the wetland to storage in the watershed: Estimate the ratio of the area of upstream basin
5
contributing surface water to the wetland to the area of the wetland unit itself.
The area of the basin is less than 10 times the area of the unit points = 5
The area of the basin is 10 to 100 times the area of the unit points = 3
The area of the basin is more than 100 times the area of the unit points = 0
Entire wetland is in the Flats class points = 5
Total for D 4 Add the points in the boxes above
16
Rating of Site Potential If score is: X 12-16 = H 6-11= M 0-5 = L Record the rating on the first page
D 5.0. Does the landscape have the potential to support hydrologic functions of the site?
D 5.1. Does the wetland receive stormwater discharges? Yes = 1 No = 0
0
D 5.2. Is >10% of the area within 150 ft of the wetland in land uses that generate excess runoff? Yes = 1 No = 0
0
D 5.3. Is more than 25% of the contributing basin of the wetland covered with intensive human land uses (residential at
>1 residence/ac, urban, commercial, agriculture, etc.)? Yes = 1 No = 0
0
Total for D 5 Add the points in the boxes above
0
Rating of Landscape Potential If score is:_3 = H _1 or 2 = M X 0 = L Record the rating on the first page
D 6.0. Are the hydrologic functions provided by the site valuable to society?
D 6.1. The unit is in a landscape that has flooding roblems. Choose the description that best matches conditions around
1
the wetland unit being rated. Do not add points. Choose the highest score if more than one condition is met.
The wetland captures surface water that would otherwise flow down -gradient into areas where flooding has
damaged human or natural resources (e.g., houses or salmon redds):
• Flooding occurs in a sub -basin that is immediately down -gradient of unit. points = 2
• Surface flooding problems are in a sub -basin farther down -gradient. points = 1
Flooding from groundwater is an issue in the sub -basin. points = 1
The existing or potential outflow from the wetland is so constrained by human or natural conditions that the
water stored by the wetland cannot reach areas that flood. Explain why points = 0
There are no problems with flooding downstream of the wetland. points = 0
D 6.2. Has the site been identified as important for flood storage or flood conveyance in a regional flood control plan?
0
Yes=2 No=O
Total for D 6 Add the points in the boxes above
1
Rating of Value If score is: -2-4 = H X 1=M _O = L
Wetland Rating System for Western WA: 2014 Update
Rating Form - Effective January 1, 2015
Record the rating on the first page
Wetland name or number Thorndvke Lake
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
2
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.
X Aquatic bed 4 structures or more: points = 4
X Emergent 3 structures: points = 2
X Scrub -shrub (areas where shrubs have > 30% cover) 2 structures: points = 1
Forested (areas where trees have > 30% cover) 1 structure: points = 0
If the unit has a Forested class, check if.•
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
2
Check the types of water regimes (hydroperiods) present within the wetland. The water regime has to cover
more than 10% of the wetland or % ac to count (see text for descriptions of hydroperiods).
X Permanently flooded or inundated 4 or more types present: points = 3
X Seasonally flooded or inundated 3 types present: points = 2
occasionally flooded or inundated 2 types present: points = 1
Saturated only 1 type present: points = 0
X Permanently flowing stream or river in, or adjacent to, the wetland
Seasonally flowing stream in, or adjacent to, the wetland
Lake Fringe wetland 2 points
__Freshwater tidal wetland 2 points
H 1.3. Richness of plant species
1
Count the number of plant species in the wetland that cover at least 10 ft'.
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
If you counted: > 19 species points = 2
5 - 19 species points = 1
< 5 species points = 0
H 1.4. Interspersion of habitats
3
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.
(::: (: 0 ) (*)
None = 0 points Low = 1 point Moderate = 2 points
All three diagrams
in this row
are HIGH = 3points
Wetland Rating System for Western WA: 2014 Update 13
Rating Form - Effective January 1, 2015
Wetland name or number Thorndike Lake
H 1.5. Special habitat features:
3
Check the habitat features that are present in the wetland. The number of checks is the number of points.
Calculate: % undisturbed habitat 55 + [(% moderate and low intensity land uses)/2] 1_1 = 6.6 % If
X Large, downed, woody debris within the wetland (> 4 in diameter and 6 ft long).
total accessible habitat is:
_Standing snags (dbh > 4 in) within the wetland
> 1/3 (33.3%) of 1 km Polygon points = 3
_Undercut banks are present for at least 6.6 ft (2 m) and/or overhanging plants extends at least 3.3 ft (1 m)
20-33% of 1 km Polygon points = 2
over a stream (or ditch) in, or contiguous with the wetland, for at least 33 ft (10 m)
10-19% of 1 km Polygon points = 1
_Stable steep banks of fine material that might be used by beaver or muskrat for denning (> 30 degree
< 10% of 1 km Polygon points = 0
slope) OR signs of recent beaver activity are present (cut shrubs or trees that have not yet weathered
H 2.2. Undisturbed habitat in 1 km Polygon around the wetland.
where wood is exposed)
Calculate: % undisturbed habitat 68.9 + [(% moderate and low intensity land uses)/2] 11.1 = 80.0%
X At least % ac of thin -stemmed persistent plants or woody branches are present in areas that are
Undisturbed habitat > 50% of Polygon points = 3
permanently or seasonally inundated (structures for egg -laying by amphibians)
Undisturbed habitat 10-50% and in 1-3 patches points = 2
X Invasive plants cover less than 25% of the wetland area in every stratum of plants (see H 1.1 for list of
Undisturbed habitat 10-50% and > 3 patches points =1
strata)
Undisturbed habitat < 10% of 1 km Polygon points = 0
Total for H 1 Add the points in the boxes above
11
Rating of Site Potential If score is:_.15-18 = H X 7-14 = M 0-6 = L Record the rating on the first page
H 2.0. Does the landscape have the potential to support the habitat functions of the site?
H 2.1. Accessible habitat (include only habitat that directly abuts wetland unit).
0
Calculate: % undisturbed habitat 55 + [(% moderate and low intensity land uses)/2] 1_1 = 6.6 % If
total accessible habitat is:
> 1/3 (33.3%) of 1 km Polygon points = 3
20-33% of 1 km Polygon points = 2
10-19% of 1 km Polygon points = 1
< 10% of 1 km Polygon points = 0
H 2.2. Undisturbed habitat in 1 km Polygon around the wetland.
3
Calculate: % undisturbed habitat 68.9 + [(% moderate and low intensity land uses)/2] 11.1 = 80.0%
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
0
> 50% of 1 km Polygon is high intensity land use points = (- 2)
<_ 50% of 1 km Polygon is high intensity points = 0
Totai {or fi 2 Add the points in the boxes above_
3
Rating of Landscape Potential If score is: -4-6 = H X 1-3=M _< 1= L
s the habitat provided y the site valuable to society.
Record the rating on the first page
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
— 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) within 100 m points =1
Site does not meet any of the criteria above points = 0
Rating of Value If score is:_2 = H _3 = M X 0 = L Record the rating on the first page
Wetland Rating System for Western WA: 2014 Update 14
Rating Form - Effective January 1, 2015
Wetland name or number Thorndvke Lake
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_ f f wdfw,wa,gov f publications100165/wdfw0016S.pdf' or access the list from here:
fes):I/wci f w. wa .gov l c o ns a rva ti on /12hs/ iist/ )
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.
— Aspen Stands: Pure or mixed stands of aspen greater than 1 ac (0.4 ha).
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).
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).
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.
— 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 f
(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 15
Rating Form - Effective January 1, 2015
Wetland name or number Thorndyke Lake
CATEGORIZATION BASED ON SPECIAL CHARACTERISTICS
Wetland Type
Category
Check off any criteria that apply to the wetland. Circle the category when the appropriate criteria are met.
SC 1.0. Estuarine wetlands
Does the wetland meet the following criteria for Estuarine wetlands?
— The dominant water regime is tidal,
— Vegetated, and
— With a salinity greater than 0.5 ppt Yes -Go to SC 1.1 rN7 NJ an estuarine wetland
SC 1.1. Is the wetland within a National Wildlife Refuge, National Park, National Estu serve, Natural Area
Preserve, State Park or Educational, Environmental, or Scientific Reserve designated under WAC 332-30-151?
Yes= Category I No - Go to SC 1.2
Cat. I
SC 1.2. Is the wetland unit at least 1 ac in size and meets at least two of the following three conditions?
— The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing, and has less
than 10% cover of non-native plant species. (If non-native species are Spartina, see page 25)
Cat. I
— At least % of the landward edge of the wetland has a 100 ft buffer of shrub, forest, or un -grazed or un -
mowed grassland.
—The wetland has at least two of the following features: tidal channels, depressions with open water, or
Cat. II
contiguous freshwater wetlands. Yes= Category I No = Category II
SC 2.0. Wetlands of High Conservation Value (WHCV)
SC 2.1. Has the WA Department of Natural Resources updated their website to include thelist et ds of High
Conservation Value? Yes - Go to SC 2. - o to SC 2.3
Cat. I
SC 2.2. Is the wetland listed on the WDNR database as a Wetland of High Conservation Value?
Yes = Category I No - of a WHCV
SC 2.3. Is the wetland in a Section/Township/Range that contains a Natural Heritage wetland?
httg:/Iwwwl.dnr.wa.gov/nhp/refdesk/datasearch/wnhpwettands_.df
Yes - Contact WNHP/WDNR and go to SC 2.4 No =Not a WHCV
SC 2.4. Has WDNR identified the wetland within the S/T/R as a Wetland of High Conservation Value and listed it on
their website? Yes= Category I No = Not a WHCV
SC 3.0. Bogs
Does the wetland (or any part of the unit) meet both the criteria for soils and vegetation in bogs? Use the key
below. If you answer YES you will still need to rate the wetland based on its functions.
SC 3.1. Does an area within the wetland unit have organic soil horizons, either peats or mucksa c ose 16 in or
more of the first 32 in of the soil profile? Yes - Go to SC 3. No - o to SC 3.2
SC 3.2. Does an area within the wetland unit have organic soils, either peats or mucks, that are - n 16 in deep
over bedrock, or an impermeable hardpan such as clay or volcanic ash, or that are floati on of a lake or
pond? Yes - Go to SC 3.3 No =9 not a bog
SC 3.3. Does an area with peats or mucks have more than 70% cover of mosses at ground level, A east a 30%
cover of plant species listed in Table 4? Yes = Is a Category I bog No - Go to SC 3.4
NOTE: If you are uncertain about the extent of mosses in the understory, you may substitute that criterion by
measuring the pH of the water that seeps into a hole dug at least 16 in deep. If the pH is less than 5.0 and the
plant species in Table 4 are present, the wetland is a bog.
Cat.1
SC 3.4. Is an area with peats or mucks forested (> 30% cover) with Sitka spruce, subalpine fir, western red cedar,
western hemlock, lodgepole pine, quaking aspen, Engelmann spruce, or western white pine, AND any of the
species (or combination of species) listed in Table 4 provide more than 30% of the cover under the canopy?
Yes = Is a Category I bog No = Is not a bog
Wetland Rating System for Western WA: 2014 Update 16
Rating Form - Effective January 1, 2015
Wetland name or number Thorndyke Lake
SC 4.0. Forested Wetlands
Does the wetland have at least 2 contiguous acre of forest that meets one of these criteria for the WA
Department of Fish and Wildlife's forests as priority habitats? If you answer VES you will still need to rate
the wetland based on its functions.
— Old-growth forests (west of Cascade crest): Stands of at least two tree species, forming a multi -layered
canopy with occasional small openings; with at least 8 trees/ac (20 trees/ha) that are at least 200 years of
age OR have a diameter at breast height (dbh) of 32 in (81 cm) or more.
— Mature forests (west of the Cascade Crest): Stands where the largest trees are 80- 200 years old OR the
species that make up the canopy have an average diameter bh) exceeding 21 in (53 cm).
Yes= Category I No Not a forested wetland for this section
Cat. I
SC 5.0. Wetlands in Coastal Lagoons
Does the wetland meet all of the following criteria of a wetland in a coastal lagoon?
— The wetland lies in a depression adjacent to marine waters that is wholly or partially separated from
marine waters by sandbanks, gravel banks, shingle, or, less frequently, rocks
—The lagoon in which the wetland is located contains ponded water that is saline or brackish (> 0.5 ppt)
during most of the year in at least a portion of the lagoon (needeosured near the bottom)
Cat. I
Yes - Go to SC 5.1 No - of a wetland in a coastal lagoon
SC 5.1. Does the wetland meet all of the following three conditions?
— The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing), and has less
than 20% cover of aggressive, opportunistic plant species (see list of species on p. 100).
Cat. II
— At least % of the landward edge of the wetland has a 100 ft buffer of shrub, forest, or un -grazed or un -
mowed grassland.
— The wetland is larger than 1/io ac (4350 ftZ)
Yes= Categoryl No = Category II
SC 6.0. Interdunal Wetlands
Is the wetland west of the 1889 line (also called the Western Boundary of Upland Ownership or WBUO)? If
you answer yes you will still need to rate the wetland based on its habitat functions.
In practical terms that means the following geographic areas:
— Long Beach Peninsula: Lands west of SR 103
— Grayland-Westport: Lands west of SR 105
Cat I
— Ocean Shores-Copalis: Lands west of SR 115 and SR 109
Yes - Go to SC 6.1 No not an Interdunal wetland for rating
SC 6.1. Is the wetland 1 ac or larger and scores an 8 or 9 for the habitat functions on the form (rates H,H,H or H,H,M
Cat. II
for the three aspects of function)? Yes= Category I No - Go to SC 6.2
SC 6.2. Is the wetland 1 ac or larger, or is it in a mosaic of wetlands that is 1 ac or larger?
Yes = Category II No - Go to SC 6.3
Cat. III
SC 6.3. Is the unit between 0.1 and 1 ac, or is it in a mosaic of wetlands that is between 0.1 and 1 ac?
Yes = Category III No = Category IV
Cat. IV
Category of wetland based on Special Characteristics
If you answered No for all types, enter "Not Applicable" on Summary Form
Wetland Rating System for Western WA: 2014 Update 17
Rating Form - Effective January 1, 2015
Wetland name or number Thorndyke I.,ake
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Wetland Rating System for Western WA: 2014 Update 18
Rating Form - Effective January 1, 2015