CANOD with wetland and flood hazard assessment.pdfCity of Edmonds
Critical Area Notice of Decision
Applicant:I
Property Owner:
Critical Area File 4:
o o
Permit Number:
2,rv,Q
Site Location:
0 9
Parcel Number:
Project Description:
S" F/Z
❑ Conditional Waiver. No critical area report is required for the project described above.
1. There will be no alteration of a Critical Area or its required buffer.
2. The proposal is an allowed activity pursuant to ECDC 23.40,220, 23.50.220, and/or
23.80,040,
3. The proposal is exempt pursuant to ECDC 23,40.230.
[] Erosion Hazard. Project is within erosion hazard area, Applicant must prepare an erosion and
sediment control plan in compliance with ECDC 18,30,
L)g. Critical Area Report Required. The proposed project is within a critical area and/or a critical area
buffer and a critical area report is required. A critical area report has been submitted and evaluated
for compliance with the following criteria pursuant to ECDC 23.40.160:
1. Z The proposal minimizes the impact on critical areas in accordance with ECDC 23.40,120,
Mitigation sequencing;
2, The proposal does not pose an unreasonable threat to the public health, safety, or welfare
on or off the development proposal site;
3, The proposal is consistent with the general purposes of this title and the public interest;
4. Any alterations permitted to the critical area are mitigated in accordance with ECDC
23.40. 110, Mitigation requirements.
5. The proposal protects the critical area functions and values consistent with the best
"available science and results in no net loss of critical functions and values; and
6. X" The proposal is consistent with other applicable regulations and standards.
E] Unfavorable Critical Area Decision. The proposed project is not exempt or does not adequately
mitigate its impacts on critical areas and/or does not comply with the criteria in ECDC 23.40.1.60 and
the provisions of the City of Edmonds critical area regulations. See attached findings of
noncompliance,
Favorable Critical Area Decision. The proposed project as described above and as shown on the
attached site plan meets or is exempt from the criteria in ECDC 23.40,160, Review Criteria, and
complies with the applicable provisions of the City of Edmonds critical area regulations. Any
subsequent changes to the proposal shall void this decision pending re -review of the proposal.
Conditions. Critical Area specific condition(s) have been applied to the permit number referenced
above. See referenced permit number for specific condition(s).
Reviewer
Signature
Z_-
��, " L4 --
Date
Appeals: Any decision to approve, condition, or deny a development proposal or other activity based on the
requirements of critical area regulations may be appealed according to, and as part of, the appeal procedure, if any,
for the permit or approval involved.
Revised 12/16/2010
WETLAND DELINEATION REPORT
for the Trieu Property; 7109 Lake Ballinger Way
Edmonds, Washington
17,--
/16
Prepared For:
Frank Trieu
7109 Lake Ballinger Way
Edmonds, WA 98026
I U—Mm- RM 10
Habitat Ecology and Design, Inc.
Kevin Karlson
1826 4th Street, Suite 202
Marysville, WA 98270
Phone: (360) 658-9810
Fax: (360) 651-7252
December 28, 2011
HEDI Project #: 11 -0045
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1.0 INTRODUCTION.................................................................................................................... 4
1.1 PURPOSE................................................................................................................................. 4
1.2 SITE DESCRIPTION.................................................................................................................. 4
1.3 CLIMATE AND GROWING SEASON..........................................................................................4
1.3.1 Growing Season.............................................................................................................. 4
1.4 DEFINITIONS........................................................................................................................... 4
1.4.1 Wetlands......................................................................................................................... 4
1.4.2 Buffers............................................................................................................................ 5
2.0 METHODS................................................................................................................................5
2.1 OFFICE RESEARCH.................................................................................................................. 5
2.2 SITE INVESTIGATION.............................................................................................................. 6
2.3 WETLAND DETERMINATION...................................................................................................6
2.3.1 Vegetation.......................................................................................................................6
2.3.2 Hydrology.......................................................................................................................6
2.3.3 Soil.................................................................................................................................. 6
2.4 OFF-SITE EVALUATION OF CRITICAL AREAS AND BUFFERS .................................................. 7
3.0 RESULTS..................................................................................................................................7
3.1 SITE INVESTIGATION..............................................................................................................7
3.1.1 Wetland A.......................................................................................................................
7
3.2 STREAMS.................................................................................................................................8
3.3 OFF-SITE EVALUATION OF CRITICAL AREAS AND BUFFERS ..................................................
8
3.4 FUNCTIONS AND VALUES.......................................................................................................
8
4.0 PROPOSED DEVELOPMENT ACTIVITIES......................................................................8
4.1 PROPOSED MITIGATION..........................................................................................................
8
5.0 CONCLUSIONS.......................................................................................................................8
6.0 DISCLAIMER..........................................................................................................................9
7.0 REFERENCES.......................................................................................................................10
APPENDIX A: MAPS AND FIGURES..........................................................................................11
LocationMap...............................................................................................................................11
AerialPhotograph........................................................................................................................12
Mapped Wetlands and Streams....................................................................................................
13
Soiland Topographic Map...........................................................................................................
14
Critical Areas Delineation Sketch................................................................................................
15
0 .0 -
TABLE 1: WETLAND A DETERMINATION SUMMARY............................................................................. 7
FIGURE1: SITE LOCATION.................................................................................................................... 1 1
FIGURE2: AERIAL PHOTOGRAPH......................................................................................................... 12
FIGURE 3: WETLANDS & HYDROLOGY MAP....................................................................................... 13
FIGURE 4: SOILS & TOPOGRAPHY MAP............................................................................................... 14
FIGURE 5: CRITICAL AREAS SKETCH................................................................................................... 15
FIGURE6: WETLAND A INTERIOR........................................................................................................ 16
FIGURE 7: WETLAND A LAKESHORE................................................................................................... 16
FIGURE 8: WETLAND A OFFSITE PONDING (WEST).............................................................................. 16
FIGURE 9: WETLAND A ONSITE BUFFER TO SOUTH............................................................................. 16
FIGURE 10: WETLAND A ONSITE BUFFER TO SOUTHWEST.................................................................. 16
Trieu Delineation
1.1 Purpose
Habitat Ecology and Design has prepared this wetland delineation report at the request of Frank
Trieu. This report serves to characterize existing wetlands on the subject property, which is located
within City of Edmonds jurisdiction. The City of Edmonds regulates wetlands as outlined under the
ECDC 23.50, and this report details on-site wetland designation, rating, and buffer requirements as
detailed in ECDC 23.50. 10 through 23.50.40.
1.2 Site Description
The subject property is located at 7109 Lake Ballinger Way, City of Edmonds, Snohomish County
(T27 R04 S32). The parcel number is 00488800800700, which accounts for approximately 0.63 -
acres (Figure 1). The subject property has been previously developed with a single family home,
driveways, sports court, dock, and landscape improvements. No other additional buildings are
located on the site. The remaining site area is dominated by mowed lawn and maintained landscaping.
According to Snohomish County hydrology data no streams are present on-site (Figure 3).
Snohomish County wetland maps indicate wetland areas on/near the site, and the NWI wetland
inventory maps indicate wetland on the north portion of the site (Figure 3). According to the Soil
Survey of Snohomish County Area, Alderwood gravelly sandy loam and Mukilteo muck make up the
entire site area. According to the National Resources Conservation Service (NRCS) the Alderwood
map unit is a non -hydric soil type and the Mukilteo muck soil type is a hydric soil. (Figure 4).
- • •ZHMW=
1.3.1 Growing Season
The U.S. Department of Agriculture, Natural Resources Conservation Service defines the growing
season as the portion of the year that soil temperature is greater than 41°F (biological zero) at 19.7
inches below the soil surface. It is approximated by the last day in spring that air temperature reaches
28°F to the first day in autumn that air temperature drops to 28°F. The average number of growing
days peaks in July; however, plant growth can occur at any time of year.
Using data for the Everett WETS station, the growing season can be approximated for five years in
ten (50% of the time) using the 28°F standard. Based on these criteria, the growing season at in the
project vicinity occurs between March 14 and October 30.
1.4.1 Wetlands
Wetlands are generally defined as those areas that are inundated or saturated by surface or
groundwater at a frequency and duration sufficient to support, and under normal circumstances do
support, a prevalence of vegetation typically adapted for life in saturated soil conditions. Wetlands
generally include swamps, marshes, bogs, wet meadows and similar areas (U.S. Army Corps of
Engineers, 1987). Also included as wetlands are artificial wetlands intentionally created from non -
wetland areas for mitigation or wetland banking. Wetlands do not normally include artificial
wetlands intentionally created from non -wetland sites, consisting of, but not limited to, irrigation and
drainage ditches, grass -lined or biofiltration swales, canals, detention facilities, wastewater treatment
facilities, farm ponds, and landscaping amenities.
December 28, 2011 Page 4 of 16
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Trieu Delineation
1.4.2 Buffers
Under ECDC a buffer is defined as the area measured horizontally outward from a delineated critical
area including wetlands; habitat conservation areas such as streams and marine shorelines; and/or
landslide hazard areas that separates and protects critical areas from adverse impacts associated with
adjacent land uses.
.0 Methods
The analysis of the resources on the subject property included preliminary office research and site-
specific investigation.
2.1 Office Research
Public resource documents have been reviewed to provide initial site information regarding
hydrology, soils, and vegetation. Sources include:
® Aerial photographs: USGS, 2003, Snohomish County, 2007.
® Topographic maps: USGS Digital Raster Graphic Program, 1995 and Snohomish County
Department of Information Services, GIS Division
® Soil Survey of Snohomish County Area, Washington: USDA, Natural Resource
Conservation Service (NRCS), 1999; Soil Survey Geographic Database for Snohomish
County Area (wa661)
® Watershed maps: Snohomish County Department of Information Services, GIS Division,
2003
® Water Type Classification Map: Snohomish County Department of Information Services,
GIS Division, 2003
® NWI and Snohomish County Wetland Maps: U.S. Fish & Wildlife Service, 2003; National
Wetlands Inventory (NWI) website, US Department of the Interior, Fish & Wildlife Service,
St. Petersburg, FL; Snohomish County, 2003, Snohomish County Stream & Wetlands Atlas
PWSWM Drainage Needs Report
December 28, 2011 Page 5 of 16
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Trieu Delineation
2.2 Site Investigation
Habitat Ecology and Design conducted field investigations on December 19, 2011, in accordance
with the Washington State Wetlands Identification and Delineation Manual and the United States
Corps of Engineers Wetlands Delineation Manual and the ACOE Interim Regional Supplement to the
Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region. In
summary, data points were examined on site to assess presence or absence of hydrophytic vegetation,
wetland hydrology, and hydric soils. Positive indicators for all three criteria are required for an area
to be determined wetland. In addition, numerous soil auger holes were assessed throughout the
subject property to determine wetland presence or absence. Habitat Ecology and Design rated
wetlands using the revised Washington State Wetland Rating System for Western Washington as
mandated under City of Edmonds Code.
2.3 Wetland Determination
When all three parameters (vegetation, hydrology, and soils) were examined at an individual
observation point, a wetland determination was made. A positive determination required that wetland
indicators were present for all three parameters. If wetland criteria were not met for any one of the
three parameters, the observation point was not considered to be within a wetland.
2.3.9 Vegetation
Under normal circumstances the 1997 State Manual requires hydrophytic vegetation (vegetation that
has adapted to life in saturated soil conditions) to be present for a location to be considered a wetland.
For each soil log hole, dominant vegetation was determined by recording the percent cover of
herbaceous vegetation within a 5 -foot radius of the soil log hole and saplings, shrubs, and trees within
a 30 -foot radius of the log hole. Plants were divided into strata layers that included herb,
sapling/shrub, and tree layers. Hydrophytic vegetation was identified according to Hitchcock and
Cronquist (1978) and Cooke (1997) and considered to be present when greater than 50% of the
dominant vegetation within a plant community had an indicator status of obligate wetland (OBL),
facultative wetland (FACW), or facultative (FAC) according to the list of plant species that occur in
wetlands (Reed, 1988 and 1993).
2.3.2 Hydrology
In general, wetland hydrology is assumed to be present when a site is continuously inundated or
saturated (within 12 inches of the surface) for greater than 12.5% of the growing season. An area that
is inundated or saturated for 5% to 12.5% of the growing season may or may not possess wetland
hydrology.
Consistent with the 1997 State Manual, the presence of wetland hydrology was determined by
evaluating direct and indirect indicators. Primary indicators include inundation, saturation in the
upper 12 inches, water marks, drift lines, sediment deposits, and drainage patterns in wetlands.
Secondary indicators include oxidized root channels in upper 12 inches, water stained leaves, local
soil survey data, FAC -Neutral test. One primary indicator or two secondary indicators were required
for a positive wetland hydrology result.
2.3.3 Soil
The presence of hydric soils, which is necessary for a positive wetland determination, was
investigated in accordance with the 1997 State Manual. Hydric soils are formed under conditions of
saturation, flooding, or ponding long enough during the growing season to develop anaerobic
conditions in the upper part of the soil profile (USDA NRCS, 2003). Hydric soil indicators, which
December 28, 2011 Page 6 of 16
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Trieu Delineation
include the presence of mottling, organic streaking, and sulfidic odors, must be present directly below
the A Horizon, or 10 inches, whichever is shallower. Hydric indicators for non -sandy soils include
organic soils (histosols), histic epipedons, sulfidic material, aquic or periaquic moisture regimes,
reducing soil conditions, and soil color (gleyed soils, or non-gleyed soils with matrix chroma <_2
containing mottles or matrix chroma = 1 without mottles). Munsell Color Charts (Kollmorgen
Corporation, 1988) were used to determine the matrix and mottle colors. Soil log holes were dug to a
depth of at least 20 inches and soil texture was evaluated using a soil texture flow chart.
2.4 Off-site Evaluation of Critical Areas and Buffers
A description and general characterization was completed for off-site critical areas and buffers
adjacent to the project site. Drainage systems entering and leaving the site were identified and
observed plant and wildlife species were recorded.
1 '-
3.1 Site Investigation
Habitat Ecology and Design conducted field investigations on December 19, 2011, and found one
wetland on the subject property. For the purposes of this report the wetland will be referred to as
Wetland A (see Figure 5 for location).
3. 1.1 Wetland A
Wetland A is a seasonally inundated/saturated lacustrine:littoral emergent (LTEM) wetland that is
located at the north property boundary of the site. The wetland is lacustrine, i.e. associated with a
lake environment, with many areas of saturation and inundation observed throughout the unit. All
three wetland indicators were observed throughout the wetland area during the field investigation.
Many areas had 1-6" of ponded water with obligate wetland species (cattail, small fruited bulrush)
present. Much of the wetland area is ponded during the wet season, with the margins seasonally
saturated.
No surface flow was observed through the wetland. The wetland appears to extend off-site to the east
and west, although the precise location of the offsite boundaries was estimated visually and not
marked. Primary and secondary indicators of hydrology were observed throughout much of the
wetland, which included shallow inundation and saturation to the surface. Soil within the wetland
was typified by an A horizon of mucky loam with a chroma 1 matrix to a depth of more than 14".
Dominant plants within the wetland include cattail, small fruited bulrush, soft rush, Douglas spirea, ,
Scouler's willow, salmonberry, reed canary grass, and creeping buttercup. Based on the Washington
State Wetland Rating System for Western Washington, the wetland meets the criteria for
classification as a Category 3 Wetland. The wetland received a score of 16 for habitat functions, 14
for water quality functions and an overall score of 34. Therefore, it is Habitat Ecology and Design's
assessment that this wetland requires a 50 -foot buffer under ECDC 23.50.040(F)(c).
Table 1: Wetland A Determination Summary
General Wetland Location Located at the north boundary of the site, approximately 1,500 SF
on-site; flags Al -A5
Cowardin Classification Seasonally Saturated Lacustrine/Littoral Emergent (LTEM).
Dominant Vegetation Scouler's willow, small fruited bulrush, soft rush, creeping
December 28, 2011 Page 7 of 16
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3.2 Streams
No channels, scour marks, or evidence of surface water runoff was observed on the subject property
at the time of our site visit.
3.3 Off-site Evaluation of Critical Areas and Buffers
Wetland A appears to continue off-site to the east and west, based on observed ponding, topography,
and vegetation. Based on aerial photographs, the entire wetland unit appears to be less than 5,000 SF.
The off-site portion of the wetland appears to consist primarily of mowed lawn vegetation, similar in
character and composition to the conditions observed on-site.
Wetland A is a relatively disturbed lacustrine emergent wetland offering moderate functions for water
quality improvement, and low functions for erosion and shoreline protection. Habitat functions are
moderate; limited by the relative small size and isolation of the wetland and the lack of connective
corridors to large, high quality wetland or upland habitats.
Propose development activity on the subject property includes the reconstruction of the existing
residence on the existing developed footprint, currently occupied by the structure and paved parking
areas. The reconstructed residence is proposed to be constructed within currently developed areas; no
native vegetation or wetland will be impacted by the proposed activity. The existing 50' buffer of
Wetland A, as well as Wetland A itself are not proposed for any impacts.
4.1 Proposed Mitigation
Since the proposed construction will not impact any wetlands, streams or their buffers, no mitigation
measures should be required.
1 • •
One Category 3 wetland was identified on the subject property on December 19, 2011. The Category
3 wetlands extend off-site to the east and west. The onsite portions of this wetland is dominated by
emergent vegetation, with small areas of scrub -shrub vegetation present. Offsite vegetation appears
to be primarily emergent. Wetland A requires a 50' standard buffer, and is located more than 50'
from any proposed activity. No streams were identified on the site.
December 28, 2011 Page 8 of 16
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This stream and wetland delineation should be considered subject to change until reviewed and
approved by the appropriate regulatory agencies with jurisdiction. The attached drawing does not
represent a survey and should be considered for conceptual feasibility purposes only.
Habitat Ecology and Design, Inc. has prepared this Wetland Delineation Report for Frank Trieu. The
information contained herein is, to our knowledge, correct and accurate. It should be recognized that
the establishment of stream and wetland boundaries is an inexact science. Streams are subject to
weather patterns, in addition to upstream and downstream activities. Wetlands are, by definition,
transition areas, and wetland boundaries often change with time. The presence of wetland indicators
may also vary depending on the time of year. Additionally, individual professionals may disagree on
the precise location of wetland boundaries or the functions and values of a wetland. All stream and
wetland boundaries, classifications, and buffer widths should be considered subject to change until
reviewed and approved by the appropriate regulatory agencies with jurisdiction. We recommend
obtaining jurisdictional approval before completing final site plans and/or beginning construction
activities. We are not responsible for the accuracy of information provided by others.
Within the limitations of schedule, budget, and scope -of -work, we warrant that this study was
conducted in accordance with generally accepted environmental science practices, including the
technical guidelines and criteria in effect at the time of this study. The results and conclusions of this
report represent the authors' best professional judgment based upon information provided by the
project proponent and information obtained during the course of this study. No other warranty,
expressed or implied, is made.
Dccember 28, 2011 Page 9 of 16
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Trieu Delineation
7.O References
Cooke, S.S. 1997. Field Guide to the Common Wetland Plants of Western Washington and
Northwestern Oregon. Seattle, WA, Seattle Audubon Society.
Cooke, S.S. 2000. Wetland and buffer functions, a semi -quantitative assessment methodology.
Cooke Scientific Services, Inc., Seattle, Washington.
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and
Deepwater Habitats of the United States. FWS/OBS-79/31. Office of Biological Services,
Fish and Wildlife Service, US Department of the Interior, Washington DC.
Environmental Laboratory. 1987. Corps of Engineers Wetlands Delineation Manual. Technical
Report Y-87-1. Corps of Engineers, Waterways Experiment Station, Vicksburg, MS.
Federal Interagency Committee for Wetland Delineation. 1989. Federal Manual for Identifying and
Delineating Jurisdictional Wetlands. U.S. Army Corps of Engineers, U.S. Environmental
Protection Agency, U.S. Fish and Wildlife Services, and USDA Soil Conservation Service,
Washington, D.C. Cooperative technique publication.
Hitchcock, C.L. and A. Cronquist. 1976. Flora of the Pacific Northwest. Seattle, WA, University of
Washington Press.
Kollmorgen Corporation. 1988. Munsell soil color charts. Baltimore, Maryland.
Reed, P.B., Jr. 1993. Supplement to National List of Plant Species that Occur in Wetlands:
Northwest (Region 9). U.S. F.W.S. Biol. Rep.
Reed, P.B., Jr. 1988. National list of plant species that occur in wetlands: Northwest (Region 9).
U.S. Fish Wildlife Service Biol. Rep. 88(26.9).
Washington Department of Ecology. 1997. Washington State Wetlands Identification anti
Delineation Manual. Publication 96-94. Washington State Department of Ecology.
Olympia, WA.
December 28, 2011 Page 10 of 16
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W."771077TIVIRO
Trieu Delineation H6,bitat Ecology
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Figure 1: Site Location
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Figure 2: Aerial Photograph
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Figure 3: Wetlands & Hydrology Map
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Image courtesy of Snohomish County, 2006
Figure 4: Soils & Topography Map
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Critical Areas Delineation Sketch
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Image courtesy of Snohomish County, 2006
Figure 5: Critical Areas Sketch
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colcffiy TN J5J5 N I5 MNIO
Figure 6: Wetland A interior.
Figure 7: Wetland A Lakeshore.
Figure 8: Wetland A offsite ponding (west).
Figure 9: Wetland A onsite buffer to south.
Figure 10: Wetland A onsite buffer to
southwest.
fIIe�I JY I1,iU Lfl F cuIo,,jy �. f I). I,jii Iris I Ii PI J,A) 8 1D Oi; K
Wetland name or number: Wetland A
WETLAND RATING FORM — WESTERN WASHINGTON
Version 2 — Updated July 2006 to increase accuracy and reproducibility among users
Updated Oct. 2008 with the new WDFW definitions for priority habitats
Name of wetland (if known): Trieu/Ballinger Wetland A Date of site visit: 12/19/11
Rated by: K. Karlson Trained by Ecology? Yes X No Date of training: October 2005
SEC: 27 TWNSHP: 4 RNGE: 32 Is S/T/R in Appendix D? Yes No:—X
Map of wetland unit: Figure: 5 Estimated size: <5,000 SF
SUMMARY OF RATING
Category based on FUNCTIONS provided by wetland. I II III
Awa
Category I =
Score > 70
Category 11 =
Score 51 - 69
Category III =
Score 30 - 50
Category IV =
Score < 30
Score for Water Quality Functions
Category based on SPECIAL CHARACTERISTCS of Wetland
Score for Hydrologic Functions
Score for Habitat Functions
TOTAL Score for Functions
I II Does not apply: X
Final Category (choose the "highest" category from above") III
Summary of basic information about the wetland unit.
Estuarine _
Natural Heritage Wetland
Bog--
Mature Forest
Old Growth Forest
Coastal Lagoon
Interdunal
None of the above
W00,41,16", c s ,
De ressional
Riverine
Lake -fringe X
Slope
Flats
Freshwater Tidal
Check if unit has multiple
HGM classes present
Endangered animal or plant species (TIE species)?
Does the wetland being rated meet any of the criteria below? If you answer YES to any of the questions below you will
neer] to nrntert the wet1nnrl nrcnrrlinv to the regnlntions regarding the sne.cial characteristics found in the wetland.
Cheek List fon Wetlands that Need Adcdtloil l rot tion
YES
NO
Lin addition to the protection recommended for Its cote' d
SP 1. Has the wetland trait been documented as a habitat for any Federally listed Threatened or
X
Endangered animal or plant species (TIE species)?
For the purposes of this rating system, "documented" means the wetland is on the appropriate
state or federal database.
SP2. Has the wetland unit been documented as habitat for any State listed Threatened or
X
Endangered animal species? For the purposes of this rating system, "documented" means the
wetland is on the appropriate state database. Note: Wetlands with State listed plant species
are categorized as Category 1 Natural Heritage Wetlands (see p. 19 of data form).
SP3. Does the wetland unit contain individuals ol'Priorityspecies listed by the WDFW for the state:?
X
SP4. Does the wetland unit have a local significance in addition to its functions? For example, the
X
wetland has been identified in the Shoreline Master Program, the Critical Areas Ordinance, or
in a local management plan as having special significance.
To complete the next part of the data sheet you will need to determine the Hydrogeomorphic Class of the wetland being. rated.
The hydmgeomorphic classification groups wetlands in to Chase that function in similar ways. This simplifies the questions needed to answer how well flee wetland
functions. The Hydrogeomorphic Class of a wetland can be determined using the key below. See p. 24 for more detailed instructions on classifying wetlands.
Wetland Rating Form — Western Washington, Version 2 (7/06), updated with new WDFW definitions Oct. 2008 Pagel of 8
Wetland name or number: Wetland A
Classification of Vegetated Wetlands for Western Washington
"„ "°°°°°°A"Ywd""'tiTr Por evels in the entire unit usually controlled by tides (i.e. except during floods)?
n,
t o t YES — the wetland class is Tidal Fringe
,,WNQ,,.."""�-g m " ��2,�)
If yes, is the salinity of the water during periods of annual low flow below 0.5 ppt (parts per thousand)?
YES — Freshwater Tidal Fringe NO — Saltwater Tidal Fringe (Estuarine)
If your wetland can be classified as a Freshwater Tidal Fringe use the forms for Riverine wetlands. If it is a Saltwater Tidal Fringe it
is rated as an Estuarine wetland Wetlands that were call estuarine in the first and second editions of the rating system are called Salt
Water Tidal Fringe in the Hydrogeomorphic Classification. Estuarine wetlands were categorized separately in the earlier editions, and
this separation is being kept in this revision. To maintain consistency between editions, the term "Estuarine" wetland is kept. Please
note, however, that the characteristics that define Category I and II estuarine wetlands have changed (see p. ).
2. The entire wetland unit is flat and precipitation is only source (>90%) of water to it. Groundwater and surface water
runoff are NOTso�NO-3
sofN wa�"
to
g of unit.
YES — The wetland class is Flats
of
0 3
If your wetland"°'fan he cla��,fie'd' as a "Flats" wetland, use the form for Depressional wetlands.
3. Does the entire wetland meet both of the following criteria?
--- The vegetated part of the wetland is on the shores of a body of permanent open water (without any
g o t wed ls'clee"Oer than 6h6 (2 )7,
vegetation on the surface) where at leas acres (,�, (m-size�u.,,....�m�...m�mm" � el
_ At least 30 Io of he open wale, p 6 2 m
NO — go to ,YES The wetland class is Labe-firnge (La ustr�ne g i
4. Does the entire wetland meet all of the following criteria?
--- The wetland is on a slope (slope can be very gradual).
------ 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?
NOTE: Surface water does not pond in these types of wetlands except occasionally in very small and
shallow depressions or behind hummocks (depressions are usually <3 ft diameter and less than I foot deep).
NO — go to 5 YES — The wetland class is Slope
5. Does the entire wetland 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 two years.
NOTE: The riverine unit can contain depressions that are filled with water when the river is not flooding..
NO — go to 6 YES — The wetland class is Riverine
6. Is the entire wetland unit in a topographic depression in which water ponds, or is saturated to the surface, at some time of
the year. This means that any outlet, if present is higher than the interior of the wetland.
NO — go to 7 YES — The wetland class is Depressional
7. Is the entire wetland 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 your wetland. 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 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.
HUM Classes within the wetland unit being rated
HUM Class to Use in Rating
Slope + Riverine
Riverine
Slope + Depressional
Depressional
Slope + Lake -fringe
Lake -fringe
Depressional + Riverine along stream within boundary
Depressional
Depressional + Lake -fringe
Depressional
Salt Water Tidal Fringe and any other class of
freshwater wetland
Treat as ESTUARINE under wetlands with special
characteristics
If you are unable still to determine which of the above criteria apply to your wetland, or you have more than Z HUM classes
within a wetland boundary, classify the wetland as Depressional for the rating.
Wetland Rating Form — Western Washington, Version 2 (7/06), updated with new WDFW definitions Oct. 2008 Page 2 of 8
Wetland name or number: Wetland A
11
Does the wetland unit have the notential to improve water quality? see 59
L 1 p q Y• ( P� )
L 1.1 Average width of vegetation along the lakeshore (use polygons of Cowardin classes):
Figure 5
• Vegetation is more than 33 ft. (10m) wide........................................................................... points = 6
* Vegetation is more than 16 wide and < 33 3
1
• (( )) ....................................................t;° points".,,
and < 6 f tt
-,If"
=
r
Vegetation is esus than 66ft.twide...w�de
® rr .
........................................................_:"..::°°fiorte
Ma of Cowardin classes with widths marked
L 1.2 Characteristics of the vegetation in the wetland: Choose the appropriate description that results in the highest
points, and do not include any open water in your estimate of coverage. The herbaceous plants can be either the
Figure 5
dominant form or as an understory in a shrub or forest community. These are not Cowardin classes. Area of Cover is
total but it canin p9O%es. Herbaceous does not include aquatic bed.
vegetated area,.�.s
of theE:
•Cover of herbaceous plants is >e
6
• Cover of herbaceous plants is > 2/3 of the vegetated area .. ......... ......... ......... ............ points = 4
• Cover of herbaceous plants is > 1/3 of the vegetated area ..................................................... points = 3
• Other vegetation that is not aquatic bed or herbaceous covers > 2/3 of the unit .................... points = 3
• Other vegetation that is not aquatic bed in > 1/3 vegetated area ........................................... points = 1
• Aquatic bed cover and open water > 2/3 of the unit.............................................................. points = 0
Map with polygons of different vegetation types
Add the oints in the boxes above
Does the wetland have the onportunity to improve water quality?
_ _7_ _
(see p. 61)
L 2
Answer YES if you know or believe there are pollutants in the lake water, or polluted surface water flowing
through the unit to the lake. Note which of the following conditions provide the sources of'pollutants. A unit
may have pollutants comingfronr several sources, but any single source would qualify as opportunity.
Wetland is along the shores of a lake or reservoir that does not meet water quality standards
Grazing in the wetland or within 150 ft
Polluted water discharges to wetland along upland edge
ot1aS"�,.u,
e in 1 oc&
�h,r t ..
ai,Multiplier
ft. lake
Parks wthgrassyareas that manamed, ballfields, golf courses (all within 150 of shore)
_ a
Power boats with gasoline or diesel engines use the lake
Other
2
YES multiplier is 2 No multiplier is 1
TOTAL —Water Quality Functions multiply the score from L1 by 1-2; then add score to table or: p. 1
14
HYDROLOGIC FUNCTION — Indicators that wetland functions to reduce shoreline erosion.
L 3
Does the wetland have the potential to reduce shoreline erosion?
(see p.6`)
L 3 Average width and characteristics of vegetation along the lakeshore (do not include aquatic bed):
(choose the highest scoring description that matches conditions in the wetland)
Figure 5
• 3/4 of distance is shrubs or forest at least 33 ft. (1 Om) wide ................................................. points = 6
• 3/4 of distance is shrubs or forest at least 6 ft. (2m) wide ..................................................... points = 4
s shrubs or forest at
nce ..........s 4"
�points
2
0.,,
Vegetation is at least 6 ft (2 m) wide (any type except aquatic bed) .............................r, :n..—
°
...
_
rr rs �,a, ��, ,..
• Vegetation is less than 6 ft. (2m) wide (any type except aquatic. bed)........... Fo r'
.
Aerial photo or ma with Cowardin vegetation classes
Record the Points in the boxes above
2
L q
Does the wetland have the onportunity to reduce erosion?
(see p. 64)
Are there features along the shore that will be impacted if the shoreline erodes? Note which of the following
conditions apply.
There are human structures and activities along the upland edge of the wetland (buildings, fields)
that can be damaged by erosion.
Multiplier
There are undisturbed natural resources along the upland edge of the wetland (e.g. mature forests,
other wetlands) that can be damaged by shoreline erosion.
2
Other..rc.m„µ.,.,..,.,.�...m..G...................„.w,m,...,.,.u,,„�..,w
„1f,gS mulUm tier is„m NO multiplier is 1
�
J1
TOTAL — Hydrologic Functions MUltIPIV the score from L3 b 1-4; then add score to table ort .
4
Comments:
Wetland Rating Form— Western Washington, Version 2 (7/06), updated with new WDFW definitions Oct. 2008 Page 3 of 8
Wetland name or number: Wetland A
, , 9�3� �
,�,".,/,�r/,,,�/!,i�„/�i��';;i��„��ri,,,.;;�”
H 1 Does the wetland have the potential to provide habitat for many species?
H 1,1 Vegetation structure (see P. 72):
Figure 5
Check the types of vegetation classes present (as defined by Cowardin) — Size threshold for each class is
1/4 acre or more than 10% of the area if unit is smaller than 2.5 acres.
X Aquatic Bed
X Emergent plants
2
X Scrub/shrub (areas where shrubs have > 30% cover)
Forested (areas where trees have > 30% cover)
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.
that
f vegetation typesp1; b' f?' � � `� ,µ
Add the nrrrnb4rstrueturestor
ou are: a3struckire��:��:'��..�.::"::�:�.r'a„�omts
more points 47 „aa .. �LEa, res po p'ts
—
2 structures .................... points = I 1 — 0
H 1.2 Hydro periods (see p.73):
Figure 5
Check the types o water re imes(hydroperiods)resent within the wetland. The water regime has to
YP f g p S
cover more than 10% of the wetland or 1/4 acre to count (see text for descriptions of hydroperiods).
X Permanentfloodedated 4 or rptypes oints 3
• Seasonally or inundated
2
rppresent
Occasion flooded or inundatedimdated „ of°rttg.,,
fY
X Saturated only I type present .................... points = 0
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 Map of hydroperiods
H 1.3 Richness of Plant Species (see p. 75):
Count the number of plant species in the wetland that cover at least 10 ftp (different patches of'the same
species can be combined to meet the size threshold)
You do not have to name the species. Do not include Eurasian Milfoil, reed calla rygrass, purple
loosestrife, Canadian Thistle. If you counted: 19 s
I
— 19pecies
pedes.................f loiants°”
5 wt
0w-=
List. species below if you want to: < 5 species ........................ points
H IA Interspersion of Habitats (see p. 76):
Decided from the diagrams below whether interspersion between Cowardin
vegetation (described in H 1. 1), or
' wat,Y �� „1 ats) is
the classes and unvegetated areas (can include open ...me n,;udfh
high, medium, low, or none.
Note: If you have 4 or more classes
or 3 vegetation classes and
Figure 5
open water, the rating is
Norge 0 t, oiriis Low-- t paint Modc'ne
always "high".
2
Use map of Cowardin classes.
p 1
p fiF
r
NAY
tripnrian hrmded chi inclsl
th h =3 nins
H 1.5 Special Habitat Features (see p. 77):
Check the habitat features that are present in the wetland. The number of checks is the number of points
yon put into the next column.
Large, clowned, woody debris within the wetland (> 4 in. diameter and 6 ft. long)
Standing snags (diameter at the bottom > 4 inches) in the wetland
Undercut banks are present for at least 6.6 ft. (2m) and/or overhanging vegetation extends at least
3.3 ft. (Im) over a stream (or ditch) in, or contiguous with the unit, for at least 33 ft. (IOm)
0
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 turned grey/brown)
At least 1/4 acre of thin -stemmed persistent vegetation 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 each stratum of plants
NOTE.' The 20% stated in early printings of the manual our page 78 is an error.
H 1 -TOTAL Score — otential for rovidino, habitat Add the points in the column above
7
Wetland Rating Form — Western Washington, Version 2 (7/06), updated with new WDFW definitions Oct. 2008 Page 4 of 8
Wetland name or number : Wetland A
H 2
Does the wetland have the opportwlity to provide habitat for many species?
H 2.1 Buffers (see P. 80):
Figure 5
Choose the description that best represents condition of buffer of wetland unit. The highest scoring
criterion that applies to the wetland is to be used in the rating. See text for definition of "undisturbed".
i I OOm (330 ft) of relatively undisturbed vegetated areas, rocky areas, or open water
> 95% of circumference. No structures are within the undisturbed part of buffer
(relatively undisturbed also means no grazing, no landscaping, no daily human use) ............. points = 5
3
100m (330 ft) of relatively undisturbed vegetated areas, rocky areas, or open water
> 50% circumference.................................................................................................... points = 4
50m (170 ft) of relatively undisturbed vegetated areas, rocky areas, or open water
> 95% circumference.................................................................................................... points = 4
100m (330 ft) of relatively undisturbed vegetated areas, rocky areas, or open water,�„„,,�„,_,,,���"���"�.,.��„a.,,m,�,". ,..,.u„�....
Gy
> 25%n circumference........................................................................................�”�:'a,W,
50m (170 ft) of relatively undisturbed vegetated areas, rocky areas, or open water
for > 50% circumference.............................................................................................. points = 3
If buffer does not meet any of the criteria above:
No paved areas (except paved trails) or buildings within 25m (80 ft) of wetland >
95% circumference. Light to moderate grazing or lawns are OIC .................................. points = 2
No paved areas of buildings within 50m of wetland for > 50% circumference.
Light to moderate grazing or lawns are OIC................................................................... points = 2
Heavygrazing in buffer................................................................................................ points = 1
Vegetated buffers are < 2m wide (6.6 ft) for more than 95% circumference
(e.g. tilled fields, paving, basalt bedrock extend to edge of wetland) ............................. points = 0
Buffer does not meet any of the criteria above.............................................................. points = 1
Arial photo showing buffers
H2.2 Corridors and Connections (seep. 81)
H 2.2.1 Is the wetland part of a relatively undisturbed and unbroken vegetated corridor (either riparian
or upland) that is at least 150 ft. wide, has at least a 30% cover of shrubs, forest or native
undisturbed prairie, that connects to estuaries, other wetlands or undisturbed uplands that are at
teav�����.��"�,.��r�„a��".�1 cr s, paved roads,
least 250 acres in size. (Darns in riparian corridor o
are considered breaks in the corridor). �..."
YES = 4 points o to H 2.3 No go to H 2.2.2
u
H. 2.2.2 Is the wetland part of a relatively undisturbed and unbroken "°v'e°g6t°ft"td0"°c"oi`ridor (either riparian
1
or upland) that is at least 50 ft. wide, has at least 30% cover of shrubs or forest, and connects to
esturies, other o r,e �r l"„ size'?OR a Lake -
t�
ardor
fringe wetland, �et n as in the uestion a o �vev
g o°rr� �'�n^r�mto
0o
t
to H 2.3edidpttuberr
points H�2 2.3
— p )
H. 2.2.3 Is the wetland:
® Within 5 mi (8km) of a brackish or salt water estuary OR°°
® Within 3 of a fieldacres) OR t t
1ppoopts "
®pasture W
Within 1 mileSof' a lake gret20acres? N®�—
Comments:
Wetland Rating Form — Western Washington, Version 2 (7/06), updated with new WDFW definitions Oct. 2008 Page 5 of 8
Wetland name or number: Wetland A
Comments:
Wetland Rating Form — Western Washington, Version 2 (7/06), updated with new WDFW definitions Oct. 2008 Page 6 of 9
H 2.3 Near or adiacent to other priority habitats listed by WDFW (see p. 82): (see new and complete
descriptions of WDFW priority habitats, and the counties in which they cart be foauad, in the PHS report
62: t�ks.F�/Wf iif if.,,6VrtR%CSY'��FP;d,i➢d'/riF1{d'ti„�. �2'td'�2, )
Which of the following priority habitats are within 330 ft. (100m) of the wetland unit?
NOTE: the connections do not have to be relatively undisturbed.
Aspen Stands: Pure or mixed stands of aspen greater than 0.4 ha (1 acre).
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 p. 152).
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 20 trees/ha (8 trees/acre) > 81 cm (32 in)
dbh or > 200 years of age. (Mature forests) Stands with average diameters exceeding 53 cm (21 in) dbh; crown
cover may be less that 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: Woodlands Stands of pure oak or oak/conifer associations where canopy coverage of the
oak component is important (hall descriptions in WDFW PHS report p. 158).
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 (frdl descriptions in WDFW PHS report p. 161).
0
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. (fidl descriptions of habitats and the definition of relatively undisturbed are in
WDFW report: pp. 167-169 and glossary in Appendix A).
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 7.6 m (25 ft) high and occurring below 5000 ft.
Talus: Homogenous areas of rock rubble ranging in average size 0.15 - 2.0 m (0.5 - 6.5 ft), 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 > 51 cm (20 in) in
western Washington and are > 2 m (6.5 ft) in height. Priority logs are > 30 em (12 in) in diameter at the largest
end, and > 6 m (20 ft) long.
If wetland has 3 or more priority habitats = 4 points
If wetland has 2 priority habitats = 3 points
If wetland has I priority habitat = I point No habitats = 0 points
Note: All vegetated wetlands are by definition a priority habitat but are not included in this list. Nearby wetlands are
addressed in question H 2.4)
H 2.4 Wetland Landscape: Choose the one description of the landscape around the wetland that best fits (see p. 84)
• There are at 'least 3 other wetlands within 1/2 mile, and the connections between them are
.,rY t(Ng grazing boat',8'>
but connections should NOT be bisected by paved roads,illfieldor development..,.,,_, , points.
® The wetland is Lake -fringe on a lake with little disturbance and there are 3 other lake -fringe
wetlandswithin 1/2 mile.....................................................................................................points = 5
5
® There are at least 3 other wetlands within 1/2 mile, BUT the connections between them are
disturbed.............................................................................................................................points = 3
m The wetland fringe on a lake with disturbance and there are 3 other lake -fringe wetlands
within1/2 mile....................................................................................................................points = 3
® There is at least 1 wetland within 1/2 mile...........................................................................points = 2
® There are no wetlands within 1/2 mile..................................................................................points = 0
H 2 TOTAL Score — opportunity for providing habitat Add the scores from H2.1, H2.2, H2.3, H2.4
0 9
_
TOTAL for H 1 from page 8
7
Total Score for Habitat Functions Add the points for H I and H 2; then record the result on p. 1
16
Comments:
Wetland Rating Form — Western Washington, Version 2 (7/06), updated with new WDFW definitions Oct. 2008 Page 6 of 9
Wetland name or number: Wetland A
CATEGORIZATION BASED ON SPECIAL CHARACTERISTICS
Please determine if the wetland meets the attributes described below
and circle the appropriate answers and Categoty.
Vedandly,yoti b tt tt ftltet 4tiuii4ty to thO welletretl. Circle the C
SC1
Estuarine wetlands? (see p.86)
Does the wetland unit 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 No
'ate National Parn��,�' ational Estuary Reserve, Natural
SC 1.1 Is the wetland unit within a National Wildlife Rede,li
Area Preserve, State Park or Educational, Env iron mer ia°"iSt""""sefle � fic Reserve designated under WAC
Cat. 1
332-30-151? YES = Category I NO = go to SC 1.2
SC 1.2 Is the wetland at least 1 acre in size and meets at least two of the following conditions?
YES =Category I NO = Category II
Cat. I
The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing, and has
less than 10% cover of non-native plant species. If the non-native Spartina spp,. are only species
Cat. II
that cover more than 10% of the wetland, then the wetland should be given a dual rating (I/II).
The area of Spartina would be rated a Category 11 while the relatively undisturbed Lipper marsh
with native species would be a Category 1. Do not, however, exclude the area of Spartina in
determining the size threshold of 1 acre.
Dual
At least 3/4 of the landward edge of the wetland has a 100 ft. buffer of shrub, forest, or un -grazed
Rating
or un -mowed grassland
I/II
The wetland has at least 2 of the following features: tidal channels, depressions with open water,
or contiguous freshwater wetlands.
SC2
Natural Heritage Wetlands (see p. 87)
Natural Heritage wetlands have been identified by the Washington Natural Heritage Program/DNR as
either high quality undisturbed wetlands or wetlands that support state Threatened, Endangered, or
Sensitive plant species.
SC 2.1 Is the wetland being rated in a Section/Township/Range that contains a natural heritage wetland? (This
question is used screen fry „�D
f re you need to contact WNHP/DNR.)
�„
ra or accessed froom WNHP/DNR Web—rte
S/T/R information foot Appendix
r �pendi
P
YES „ "ht""Tep'"J"1iP/DNR see 79 and o to SC 2.2 („ Pio
(
SC 2.2 Has DNR identified the wetland as a high quality undisturbed wetland or as a site with st"ale""th"Pea°ttY"d
or endangered plant species?
Cat I
YES = Category 1 NO not a Heritage Wetland
C3
Boys (seep. 87)
Does the wetland (or any part of the unit) meet both the criteria for soils and vegetation in bogs? Use
the key below to identify if the wetland is a bog. If yore answeryes you will still need to rate the
wetland based on its function.
I. Does the unit have organic soil horizons (i.e, layers of organic soil), either peats or mucks, that
�r ` r
comP p M" field key to
tsoils,
,, NO _�goe�o question 2
identifyorganic sods YES – oto question 3
g )? _ g
muc�kr
h es„, "a �)
2. Doesthe wetland have organic eitherrr eats or Int are less than 16 inc ep over
bedrock, or an impermeable hardpan such as clay or volcarw
,a ,w "iiiai'are"�fioat" rc"gta4anke,,,,t?"I
not a bog for
pond? YES = go to question oAND pof presense of tin„g
3. Does the unit have more than 7010 cover of mosses at Fund level, other plants,
consist of the bog species listed in Table 3 as a significant 1.11"'bpu�ra"n"ft",W �;el�rr"r°r tfnore
than 30% of the total shrub and herbaceous cover consists of species in Table 3)?
YES = Is a bog for purpose of rating NO = go to question 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" deep. If the pH is
less than 5.0 and the "bog" plant species in Table 3 are present, the wetland is a bog.
4. Is the unit forested (> 30% cover) with sitka spruce, subalpine fir, western red cedar, western
hemlock, lodgepole pine, quaking aspen, Englemann's spruce, or western white pine. WITH any of
the species (or combination of species) on the bog species plant list in Table 3 as a significant
component of the ground cover (> 30% coverage of the total shrub/herbaceous cover)?
Cat. I
YES = Category I NO = Is not a bog for purpose of rating
Wetland Rating Form – Western Washington, Version 2 (7/06), updated with new WDFW definitions Oct. 2008 Page 7 of 8
Wetland name or number: Wetland A
C4
Forested Wetlands (seep, 90)
Does the wetland have at least I acre of forest that meet one of these criteria for the Department of Fish
and Wildlife's forests as priority habitats? If you answer yes you will still need to rate the wetland
based on its function.
Old-growth forests: (west of Cascade Crest) Stands of at least two three species forming a
multi -layered canopy with occasional small openings; with at least 8 trees/acre (20 trees/hectare)
that are at least 200 years of age OR have a diameter at breast height (dbh) of 32 inches (81 cm or
more).
NOTE: The criterion for dbh is based on measurements for upland forests. Two -hundred year old trees
in wetlands will often have a smaller dbh because their growth rates are often slower. The DFW
criterion is and "OR" so old-growth forests do not necessarily have to have trees of this diameter.
Mature forests: (west of the Cascade Crest) Stands where the largest trees are 80 – 200 years old
OR have an average diameters (dbh) exceeding 21 inches (53 cm); crown cover may be less than
100%; decay, decadence, numbers of snags „• flL],0r„antlt�y-�f„' -�g -dw—nad�,��mat,Pr�, ally
less than that found in old- row„���r°° ,Gw,.w„��.��,,,
f .�n,.�,�„r.,�
less
Cat. I
YES – Cate or I ����„� rt 'r ctelu,�ntl�
g y not a forested wetland with special chary
SCS
Wetlands in Coastal Lagoons (see 91
� � (. p. )
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 surface water that is saline or brackish (> 0.5
ppt) during most of the year in at least a portion of the lagoon (needs to be measured near the
bottom.) ....,.,,
YES = Go to SC 5.1 ,���.� �,�I�„�! . ua.,lr,�t a„wetland,..iAn..a„.9a�5�f.)
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 invasive plant species (see list of invasive species on p. 74).
At least 3/4 of the landward edge of the wetland has a 100 ft. buffer of shrub, forest, or un -grazed
or un -mowed grassland.
Cat. I
The wetland is larger than 1/10 acre (4350 square ft.)
YES = Category I NO =Category II
Cat. II
SC6
Interdunal Wetlands (see p. 93)
Is the wetland west of the 1889 line (also called the Western Boundary of Upland Ownership or
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WBUO)?���,���,A.,,,�����,��a�.,�,�� ���,,.. mm���..�
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YES = Go to SC 6.1 ® not an interdunal wetland for rating '^”
ed to
If you answer yes you will still merate &F'iVWflai'd—ba"sed"ori"t"ts %i�iactrarts.
In practical terms that means the following geographic areas:
m Long Beach Peninsula -- lands west of SR 103
® Grayland-Westport -- lands west of SR 105
® Ocean Shores-Copalis – lands west of SR 115 and SR 109
SC 6.1 Is the wetland one acre or larger, or is it in a mosaic of wetlands that is one acre or larger?
YES = Category II NO = go to SC 6.2
Cat. II
SC 6.2 Is the wetland between 0.1 and 1 acre, or is it in a mosaic of wetlands that is between 0.1 and 1 acre?
YES = Category III
Cat. III
Category of wetland based on Special Characteristics
Choose the "highest" rating if wetland falls into several categories, and record on p. I.
If you answered No for all types enter "Not Applicable" on p. 1
Comments:
Wetland Rating Form – Western Washington, Version 2 (7/06), updated with new WDFW definitions Oct. 2008 Page 8 of 8
E11:i IV]! C�/\rz l@ i,IY, I�� .., �:� �
Hydrology ", F°lydraulic [`_`nglneer'n g
February 13, 2012
Mr. Frank Trieu
c/o Mel Maertz
M2 Architects
Ike: 7109 Lake Ballinger Way — Tax Parcel 00488800800700
Lake Ballinger Flood Hazard Assessment
Dear Mr. Trieu:
9957 171 AVENUE E
FBF: N ON, WA 98059
I've completed a flood hazard assessment for your property located at 7109 Lake
Ballinger Way in Edmonds. This assessment meets the requirements of Edmonds City
Code 23.70.020 for special studies and reports.
The subject property is on the south shore of Lake Ballinger and is in an area mapped by
FEMA as a Zone A flood hazard area (Attachment A). Zone A areas have a one percent
annual chance of flooding. Because Zone A flood areas do not have a FEMA -approved
flood study, no depths or base flood elevations are shown within these zones on the
FEMA map.
I understand that the existing single-family structure on the subject property will be
replaced with a new one. The finished floor elevation of the existing structure on the site
is at elevation 288.29 feet NAVD 88 (J.C. McDonnell, December 2011).
City of Edmonds Operational Policy
The City of Edmonds Building Department has adopted an operational policy to adopt a
base flood elevation of Lake Ballinger. The City has adopted a base flood elevation
(BFE) of 286.14 feet NAVD 88 for the lake (Figure 1). This elevation is based on the
highest observed water level in the lake, which occurred during a storm in January 1997.
Other Past Flood Studies
Hydrologic studies for Lake Ballinger have been conducted as part of past basin and
flood studies for the City of Edmonds and the City of Lake Forest Park (Aqua Terra,
June 1999; Clear Creek Solutions, June 2008; Clear Creels Solutions, January 2009;
Otak, December 2009). None of the studies have resulted in a base flood elevation for the
lake that has been approved by FEMA. Based on HSP -F hydrologic modeling, the
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Mr. Frank Trieu
Page 2
February 13, 2012
elevations of the lake have been predicted to be 284.14 feet NAVD 881 for the 10 -year,
284.90 feet NAVD 88 for the 50 -year, and 285.19 feet NAVD 88 for the 100 -year flood
elevation (Clear Creek Solutions, June 2008). I could not find any reference to the
estimated return period of the January 1997 storm that resulted in an observed peak
flood elevation that is higher than the 100 -year flood elevation predicted by Clear Creek
Solutions.
Recommendations
The applicant must follow local building code requirements in construction of the new
structure. I recommend the following flood control related measures, provided they are
not in conflict with any of the City's building requirements:
The finished floor elevation of the proposed structure on the project site must be a
minimum of 1 foot above the City's adopted BFE of 286.14 feet NAVD 88.
Given the lack of an approved FEMA flood study, I recommend constructing the
finished floor for the new structure 2 or 3 feet above the City's adopted BFE.
Selecting a higher finished floor elevation would help protect against uncertainty
in the adopted BFE. In addition, a conservative selection of the finished floor
elevation would help protect the structure against the potential effects of wind
generated waves. For instance, the wind fetch across the lake is a distance of
approximately 2,800 feet. Assuming a 60 mph wind velocity across the lake, a
wave height of 1.9 feet could develop as a result of the wind (Washington State
Department of Ecology, 1993).
If any portion of the structure is to be located below the BFE, the structure must
be designed and constructed to resist flotation, collapse, and lateral movement
when subjected to base flooding conditions. All materials installed below the base
flood elevation must be flood resistant materials, such as concrete and corrosion
resistant metals
Vents are required in any enclosed space below the BFE not designed to resist
hydrostatic forces to relieve hydrostatic pressure on the structure. A minimum of
one (1) square inch of vent area is required for each square foot of enclosed space.
Vents must be installed on a minimum of two sides of the structure, with the
bottom of the vent within one (1) foot of the exterior adjacent grade and the top of
the vent no higher than the BFE. Vents may be equipped with screens or louvers
which allow for the automatic entry and exit of floodwaters.
1 The original report cites these elevations using a vertical datum of NGVD29. The following conversion
was used: NAVD 88 = NGVD 29 + 3.60
Mr. Frank Trieu
Page 3
February 13, 2012
All machinery, and equipment should be elevated above the BFE or be designed,
constructed and installed to prevent floodwaters from entering or accumulating
within its components.
® The Flood Elevation Certificate provided in Attachment B must be updated with
changes in the site plan. If required by any agency or lending institution, a final
version of the Elevation Certificate must be prepared once the building is
constructed and data entered onto the form have been field -verified.
ONAL
Edward J. McCarthy, Ph.D., P.E.
Mr. Frank Trieu
Page 4
February 13, 2012
References
City of Edmonds, June 2011. Building Department Operation Policy 062011 — Flood
Plain Elevation of Lake Ballinger.
Clear Creek Solutions Inc., 2008. Lake Ballinger Lake Level and Outlet Study. Prepared
for the City of Edmonds.
Hammond, Collier & Wade Livingstone Associates and Aqua Terra Consultants, 1999.
McAleer and Lyon Creeks Drainage Basin Study. Prepared for the City of Lake
Forest Park.
J.C. McDonnell, December 14, 2011. Trieu Site Plan and Base Map. Mill Creek, Wash.
Otak, 2009. Flood Reduction Planning Study Lyon Creek/McAleer Creek Drainage
Basins. Prepared for the City of Lake Forest Park.
Washington State Department of Ecology, 1993. Dam Safety Guidelines- Part IV Dam
Design and Construction. Water Resources Program — Dam Safety Office.
Olympia, Wash.
m-YFI AND 50 -NR; CLEAR CREEK
SOLU DONS LAKE LEVEL STUDY (,OJNE
2008)
8FE: CITY OF EDMONDS OPERATION
POLICY 0062011
mm
FIGURE 1. SITE TOPOGRAPHY
TRIEU RESIDENCE
7109 LAKE SAWNGER *=
Attachment A. FEMA Flood Map
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Attachment B. Draft Elevation Certificate
U.S. DEPARTMENT OF HOMELAND SECURITY ELEVATION CERTIFICATE OMB No. 1660-0008
Federal Emergency Management Agency [Expires
March 31, 2012
National Flood Insurance Program Important: Read the instructions on pages 1-9.
SECTION A - PROPERTY INFORMATION Company Use:
Al. Building Owner's Name Frank Trieu Pdlicy Number
A2. Building Street Address (including Apt., Unit, Suite, and/or Bldg. No.) or P.O. Route and Box No. Company NAIC Number
7109 Lake Ballinger Way
City Edmonds State WA ZIP Code 98026
A3. Property Description (Lot and Block Numbers, Tax Parcel Number, Legal Description, etc.)
Tax Parcel Number 00488800800700
A4. Building Use (e.g., Residential, Non -Residential, Addition, Accessory, etc.) Residential
A5. Latitude/Longitude: Lat. 47 46' 42.42" Long. 122 19' 43.77" Horizontal Datum: ❑ NAD 1927 ❑ NAD 1983
A6. Attach at least 2 photographs of the building if the Certificate is being used to obtain flood insurance.
A7. Building Diagram Number 1B
A8. For a building with a crawlspace or enclosure(s): A9. For a building with an attached garage:
a) Square footage of crawlspace or enclosure(s) sq ft a) Square footage of attached garage sq ft
b) No. of permanent flood openings in the crawlspace or b) No. of permanent flood openings in the attached garage
enclosure(s) within 1.0 foot above adjacent grade within 1.0 foot above adjacent grade
c) Total net area of flood openings in A8.b sq in c) Total net area of flood openings in A9.b sq in
d) Engineered flood openings? ❑ Yes ❑ No d) Engineered flood openings? ❑ Yes ❑ No
SECTION B - FLOOD INSURANCE RATE MAP (FIRM) INFORMATION
B1. NFIP Community Name & Community Number B2. County Name B3. State
City of Edmonds 530163 1 Snohomish I WA
B4. Map/Panel Number
B5. Suffix
B6. FIRM Index
B7. FIRM Panel
B8. Flood
B9 Base Flood Elevation(s) (Zone
Map 53061C Panel 1315
E
Date
Effective/Revised Date
Zone(s)
AO, use base flood depth)
11/8/99
11/8/99
A
286.14
B10. Indicate the source of the Base Flood Elevation (BFE) data or base flood depth entered in Item B9.
❑ FIS Profile ❑ FIRM ® Community Determined ❑ Other (Describe)
B11. Indicate elevation datum used for BFE in Item 139: ❑ NGVD 1929 ® NAVD 1988 ❑ Other (Describe)
B12. Is the building located in a Coastal Barrier Resources System (CBRS) area or Otherwise Protected Area (OPA)? ❑ Yes ® No
Designation Date ❑ CBRS ❑ OPA
SECTION C - BUILDING ELEVATION INFORMATION (SURVEY REQUIRED)
Cl. Building elevations are based on: ® Construction Drawings* ❑ Building Under Construction* ❑ Finished Construction
*A new Elevation Certificate will be required when construction of the building is complete.
C2. Elevations - Zones Al -A30, AE, AH, A (with BFE), VE, V1 -V30, V (with BFE), AR, AR/A, AR/AE, AR/A1-A30, AR/AH, AR/AO. Complete Items C2.a-h
below according to the building diagram specified in Item A7. Use the same datum as the BFE.
Benchmark Utilized Field tie to tidal watersVertical Datum NAVD 88
Conversion/Comments N/A
Check the measurement used.
a) Top of bottom floor (including basement, crawlspace, or enclosure floor) 287.0 ® feet ❑ meters (Puerto Rico only)
b) Top of the next higher floor 297.0 ® feet ❑ meters (Puerto Rico only)
c) Bottom of the lowest horizontal structural member (V Zones only) ❑ feet ❑ meters (Puerto Rico only)
d) Attached garage (top of slab) ❑ feet ❑ meters (Puerto Rico only)
e) Lowest elevation of machinery or equipment servicing the building 287.0 ® feet ❑ meters (Puerto Rico only)
(Describe type of equipment and location in Comments)
0 Lowest adjacent (finished) grade next to building (LAG) 287.0 ® feet ❑ meters (Puerto Rico only)
g) Highest adjacent (finished) grade next to building (HAG) 296. ® feet ❑ meters (Puerto Rico only)
h) Lowest adjacent grade at lowest elevation of deck or stairs, including 287.0 ® feet ❑ meters (Puerto Rico only)
structural support
SECTION D - SURVEYOR, ENGINEER, OR ARCHITECT CERTIFICATION
This certification is to be signed and sealed by a land surveyor, engineer, or architect authorized by law to certify elevation
information. I certify that the information on this Certificate represents my best efforts to interpret the data available.)
understand that any false statement may be punishable by fine or imprisonment under 18 U. S. Code, Section 1001.
Check here if comments are provided on back of form. Were latitude and longitude in Section A provided by a
licensed land surveyor? ❑ Yes ® No
Certifier's Name Edward J.
License Number 28576
Title Water Resource Engineer Company Name Ed McCarthy, PE, PS
Address 9957 171 Ave SE City Renton State WA ZIP Code 98059
Signature Date 2-10-12 Telephone 425-271-5734
FEMA Form 81-31, Mar 09 See reverse side for continuation. Replaces all previous editions
IMPORTANT: In these spaces, copy the corresponding information from Section A.
Building Street Address (including Apt., Unit, Suite, and/or Bldg. No.) or P.O. Route and Box No.
7109 Lake Ballinger Way y
City EdmondsState WA ZIP Code 98026
SECTION D - SURVEYOR, ENGINEER, OR ARCHITECT CERTIFICATION (CONTINUED)
Copy both sides of this Elevation Certificate for (1) community official, (2) insurance agent/company, and (3) building owner.
Signature Date 2-10-12
❑ Check here if attachments
SECTION E - BUILDING ELEVATION INFORMATION (SURVEY NOT REQUIRED) FOR ZONE AO AND ZONE A (WITHOUT BFE)
For Zones AO and A (without BFE), complete Items E1 -E5. If the Certificate is intended to support a LOMA or LOMR-F request, complete Sections A, B,
and C. For Items E1 -E4, use natural grade, if available. Check the measurement used. In Puerto Rico only, enter meters.
E1. Provide elevation information for the following and check the appropriate boxes to show whether the elevation is above or below the highest adjacent
grade (HAG) and the lowest adjacent grade (LAG).
a) Top of bottom floor (including basement, crawlspace, or enclosure) is ❑ feet ❑ meters ❑ above or ❑ below the HAG.
b) Top of bottom floor (including basement, crawlspace, or enclosure) is ❑ feet ❑ meters ❑ above or ❑ below the LAG.
E2. For Building Diagrams 6-9 with permanent flood openings provided in Section A Items 8 and/or 9 (see pages 8-9 of Instructions), the next higher floor
(elevation C2.b in the diagrams) of the building is ❑ feet ❑ meters ❑ above or ❑ below the HAG.
E3. Attached garage (top of slab) is ❑ feet ❑ meters ❑ above or ❑ below the HAG.
E4. Top of platform of machinery and/or equipment servicing the building is ❑ feet ❑ meters ❑ above or ❑ below the HAG.
E5. Zone AO only: If no flood depth number is available, is the top of the bottom floor elevated in accordance with the community's floodplain management
ordinance? ❑ Yes ❑ No ❑ Unknown. The local official must certify this information in Section G.
SECTION F - PROPERTY OWNER (OR OWNER'S REPRESENTATIVE) CERTIFICATION
The property owner or owner's authorized representative who completes Sections A, B, and E for Zone A (without a FEMA -issued or community -issued BFE)
or Zone AO must sign here. The statements in Sections A, B, and E are correct to the best of my knowledge.
Property Owner's or Owner's Authorized Representative's Name
Address City State ZIP Code
Signature Date Telephone
Comments
❑ Check here if attachments
SECTION G - COMMUNITY INFORMATION (OPTIONAL)
The local official who is authorized by law or ordinance to administer the community's floodplain management ordinance can complete Sections A, B, C (or E),
and G of this Elevation Certificate. Complete the applicable item(s) and sign below. Check the measurement used in Items G8 and G9.
G1. ❑ The information in Section C was taken from other documentation that has been signed and sealed by a licensed surveyor, engineer, or architect who
is authorized by law to certify elevation information. (Indicate the source and date of the elevation data in the Comments area below.)
G2. ❑ A community official completed Section E for a building located in Zone A (without a FEMA -issued or community -issued BFE) or Zone AO.
G3. ❑ The following information (Items G4 -G9) is provided for community floodplain management purposes.
G4. Permit Number I G5. Date Permit Issued I G6. Date Certificate Of Compliance/Occupancy Issued
G7. This permit has been issued for: ❑ New Construction ❑ Substantial Improvement
G8. Elevation of as -built lowest floor (including basement) of the building: ❑ feet ❑ meters (PR) Datum
G9. BFE or (in Zone AO) depth of flooding at the building site: ❑ feet ❑ meters (PR) Datum
G10. Community's design flood elevation ❑ feet ❑ meters (PR) Datum
Local Official's Name Title
Community Name Telephone
Signature Date
Comments
❑ Check here if attachments
FEMA Form 81-31, Mar 09 Replaces all previous editions
Building Photographs
See Instructions for Item A6.
Continuation Pacie