HomeMy WebLinkAboutBLD2022-00410_09B- Wetlands ReportOctober 31, 2022 TIM MURRAY WETLAND DELINEATION PARCEL 962700097, JEFFERSON
COUNTY, WASHINGTON.
Crescent Environmental PLLC 1
Wetland Delineation of Parcel 962700097 Jefferson County, Washington.
David S. Parks M.S.
Principal Geologist/Wetland Scientist
L.G., L.E.G., L.H.G., #533/ PWS#1623
Crescent Environmental PLLC
424 East First Street, Box 429
Port Angeles WA 98362
360-640-3187
Email: crescentenvironmental@gmail.com
October 31, 2022 TIM MURRAY WETLAND DELINEATION PARCEL 962700097, JEFFERSON
COUNTY, WASHINGTON.
Crescent Environmental PLLC 2
October 31, 2022
Tim,
At your request and consistent with our agreed scope-of-work dated 8/8/2022, I performed a
wetland delineation and functional assessment on your parcel # 962700097 located in Jefferson
County, Washington (Figure 1).
This wetland delineation is prepared because Jefferson County is requiring a new building permit
after the previously approved permit lapsed.
Jefferson County Critical Areas Code (Title 18.22) uses the following definition for regulated
wetlands:
Wetland Definition:
“(22) "Wetland" or "wetlands" means areas that are inundated or saturated by surface water or groundwater
at a frequency and duration sufficient to support, and that under normal circumstances do support, a
prevalence of vegetation typically adapted for life in saturated soil conditions. Wetlands generally include
swamps, marshes, bogs, and similar areas. Wetlands do not include those artificial wetlands intentionally
created from nonwetland sites, grass-lined swales, canals, detention facilities, wastewater treatment
facilities, farm ponds, and landscape amenities, or those wetlands created after July 1, 1990, that were
unintentionally created as a result of the construction of a road, street, or highway. However, wetlands may
include those artificial wetlands intentionally created from nonwetland areas to mitigate conversion of
wetlands, if permitted by the county or city”. (WAC 365-190-030).
The subject parcel (962700097) is located directly adjacent to Oak Bay, a Shoreline of Statewide
Significance near Irondale, Jefferson County, Washington (Figure 1).
The subject parcel was originally platted in 1910 as part of the Irondale Acre Tracts according to
documents recorded with the Jefferson County assessor (Vol. 2, Page 145).
The parcel is approximately 0.98 acres in area. The address of the parcel is 102 Cleveland
Avenue, Port Hadlock, Washington, 98339.
Site Characteristics
The subject parcel is situated on a gently to moderately sloping terraced outwash and till
hillslope bordering Oak Bay to the east.
The elevation of the subject parcel ranges from approximately 6.6 feet above mean sea level
(m.s.l.) on the east side to approximately 50 feet on the west side based on LiDAR bare earth
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COUNTY, WASHINGTON.
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elevation data using the National Vertical Datum of 1988 (NAVD88) (Figure 2).
Precipitation is seasonally variable, characterized by wet mild winters and relatively dry, cool,
summers. Annual average precipitation (1981-2010) is approximately 22 inches primarily
occurring as rainfall.
Native upland vegetation on the parcel is a mixed second-growth conifer-dominated forest
composed of Douglas fir and Red alder. The understory vegetation is dominated by plant
species such as Sword fern, Salal, Snowberry, Red alder and Salmonberry.
I visited the site on August 24 and October 6, 2022, during the growing season and walked the
parcel boundaries and adjacent areas. I excavated shallow soil pits to 16 inches to evaluate soil
color, texture, and shallow groundwater characteristics and recorded vegetation communities
consistent with the U.S. Army Corps of Engineers (USACE) Western Valleys and Mountains
Regional Supplement to the Federal Wetland Delineation Manual adopted by Jefferson County
(USACE, 2010).
I collected vegetation, soils, and hydrology data in two plots, one located in the central portion of
the parcel and one located in the eastern area. Plot locations are shown on Figure 21 and Plot
Data Forms are included in Appendix A. Additionally, prior to visiting the site I reviewed the
following information:
1. LiDAR Topography.
2. NRCS On-line soil survey (NRCS, 2020).
3. Jefferson County Critical Areas On-Line Mapping.
4. National Wetlands Inventory Mapping (NWI, USFWS 2021).
5. Aerial photographs from 1942, 1951, 1956, 1989, 2006, 2009, 2011, 2013, 2015, 2017,
and 2021.
6. Oblique aerial photographs from the Washington Department of Ecology for 1977, 1992,
2000, 2006, 2016.
The NRCS On-Line Soil Survey indicates the parcel soils are (incorrectly) mapped as Tidal
Marsh (hydric) soils (Figure 3).
Jefferson County Critical Areas Mapping shows wetland areas occupying the eastern portion of
parcel 962700097 (Figure 4).
The National Wetlands Inventory (NWI) mapping shows wetlands associated with the marine
waters of Oak Bay adjacent to the eastern portion of parcel 962700097, but no wetlands mapped
on the parcel itself. (Figure 5).
Aerial photographs (Figures 6-15) do not indicate the presence of wetlands on parcel 962700097.
Oblique aerial photographs from the Washington Department of Ecology do not show any
evidence of wetland conditions on the subject parcel.
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On-Site Observations
The primary wetland area observed adjacent to the south of parcel 962700097 is the marine
shoreline and tidelands of Oak Bay (Photograph 1). No other wetland areas were observed on the
subject parcel.
Upland areas on the parcel are dominated by Douglas fir (Pseudotsuga menziesii) and Red alder
(Alnus rubra) (Photograph 2).
One small area in the central portion of the parcel (less than 0.10 acre) exhibits a marginally
facultative wet plant community including Scoulers Willow, Pacific Crabapple, Soft Rush, Giant
butter cup, Lady fern, Field Horsetail, Rough Horsetail, Nootka Rose and Evergreen Blackberry.
The area exhibiting marginal hydrophytic vegetation receives storm water runoff from the
parcels and surface roads in the adjacent (south) residential development via a series of ditches
and a culvert. Review of the oblique shoreline photography indicates the residential development
adjacent to the south was under construction in 1990.
Oblique aerial photographs from 2000 and 2006 indicate an increase in shrub growth following
the installation of storm water facilities that directed surface runoff onto the subject parcel.
In order to determine whether the small area displaying hydrophytic plants was a wetland or not,
I collected vegetation, soils and hydrology observations at two plots. Plot A and B are located on
the central and eastern portion of the area of interest. Data collected at these plots are shown in
Appendix A.
Plot A (Western Plot)
Plot A is located approximately 45 feet north of Plot B on the north side of the area of interest
(Figure 21.). The area of interest is within the footprint of a former house shown in aerial
photographs from 1956 to 1989. This house apparently burned down after the 1989 photography.
Vegetation at Plot A consisted of an over story of Scoulers Willow, and an understory composed
of Soft Rush, Field horsetail, Nootka Rose and Evergreen Blackberry.
Soils at Plot A consisted of Brown (10YR 3/3) very dense gravelly sandy loam.
The soil profile at Plot A was dry to within 16 inches of soil surface, there was no evidence of a
water table, and no evidence of surface inundation.
Site conditions observed at Plot A indicate the negative presence of wetland parameters.
It is likely that the plant community is responding to the seasonal inputs of storm water runoff
from the adjacent road and residential development.
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Plot B (Eastern Plot)
Plot B is located in an upland area on the eastern side of the area of interest (Figure 21).
The plant community is mixture of upland and facultative species including Douglas fir, Scoulers
willow, Western crabapple, Field Horsetail, Clover, Himalayan blackberry.
Soils at Plot 2 consisted of Dark Brown (10YR 3/3) very dense, sandy, gravelly loam. (Note: soil
color nomenclature follows Munsell Soil Color Chart standards (Munsell Color, 2000).
The soil profile at Plot B was dry to 16” below the soil surface. There was no evidence of surface
water ponding or inundation at Plot B.
No wetland parameters (plants, soils and hydrology) are satisfied at Plot B, therefore Plot B is
located in an upland location.
Wetland Delineation
Based on on-site investigation of plants, soils and hydrology within the parcel boundaries, no
wetland area was delineated on parcel 962700097 other than the marine shoreline associated
with Oak Bay.
Based on on-site observations, the soil type mapped by the NRCS for this location (Tidal Marsh)
is inaccurate. The soils observed in soil pits on site most closely matches the Tukey soil series
mapped on the northern portion of the parcel.
Additionally, the wetland mapping shown on the Jefferson County Critical Areas mapping is also
incorrect for this location (Figure 4).
Marine Shoreline of Oak Bay
The shoreline of Oak Bay is a Shoreline of Statewide Significance and a Type S water. The tidal
lagoon adjacent to the subject parcel is classified as an “Estuarine and Deepwater Marine
Wetland” by the National Wetlands Inventory (Figure 5).
The Hydrogeomorphic Wetland Class (HGM) for this wetland would be “Tidal Fringe Wetland”.
Tidal fringe wetlands occur along coasts and estuaries and are under the influence of sea level.
They intergrade landward with riverine wetlands where tidal current diminishes and river flow
becomes the dominant water source. Additional water sources may be groundwater discharge
and precipitation. The interface between the tidal fringe and riverine classes is where
bidirectional flows from tides dominate over unidirectional flow controlled by floodplain slope
of riverine wetlands. Because tidal fringe wetlands frequently flood and water table elevations
are controlled mainly by sea surface elevation, tidal fringe wetlands lose water by tidal exchange,
by overland flow to tidal creek channels, and by evapotranspiration. Organic matter normally
October 31, 2022 TIM MURRAY WETLAND DELINEATION PARCEL 962700097, JEFFERSON
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accumulates in higher elevation marsh areas where flooding is less frequent and the wetlands are
isolated from shoreline wave erosion by intervening areas of low marsh. (USACE, 2022).
Tidal fringe wetlands are considered Type 1 wetlands in the Western Washington Functional
Rating methodology (WDOE, 2015) (Appendix B).
Wetland boundaries on the Tidal Fringe wetland were staked and flagged in the field and their
locations mapped using an Arrow Gold real-time kinematic global positioning system (RTK-
GPS) connected to the Washington State Reference Network (WSRN) to access real-time
positioning corrections. Wetland boundaries were mapped in two-dimensional (x, y) space using
U.S. Feet in the NAD83 datum using the State Plane Washington North projection with an
accuracy of approximately +/- 5 cm Root Mean Square Error (RMSE).
The wetland boundary is staked approximately every 25-feet along the eastern parcel boundary
with 4-foot tall wood surveyor stakes and orange flagging at an elevation of approximately 7 feet
above sea level (NAVD88).
Wetland Functional Assessment
Wetlands delineated on the parcel were evaluated using the methods published by the
Washington Department of Ecology (WDOE, 2015) “Washington State Wetland Rating System
for Western Washington”. The assessment forms are presented in Appendix B.
Based on the WDOE Western Washington Wetland Rating System, the wetland present on the
parcel would be designated as Class I wetland based on function because it is an Estuarine
Wetland. The WDOE Western Washington Wetland Rating System does not provide any
additional functional assessment for the Estuarine wetland classification.
Critical Areas Buffers
The Fish and Wildlife Habitat Conservation Area (FWHCA) and wetland buffer required by
Jefferson County Code is 150 feet.
The buffer proposed for this parcel is 76 feet as shown on Figure 21. This represents a 49%
reduction from the standard buffer.
Because a 49% reduction in the standard buffer is being proposed, mitigation for this reduction is
also being proposed.
October 31, 2022 TIM MURRAY WETLAND DELINEATION PARCEL 962700097, JEFFERSON
COUNTY, WASHINGTON.
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Mitigation Plan
In order to allow for the establishment of a single family residence 76 horizontal feet from the
Ordinary High Water Mark (OWHM) on the Type S water (Oak Bay) adjacent to the parcel, as
previously approved by Jefferson County in 2011, I recommend implementation of a mitigation
plan for this parcel to restore the functions and values of the marine shoreline and riparian zone.
Contents of the Mitigation Plan include:
1. Establishment of a 76-foot horizontal buffer from the Ordinary High Water Mark on
Oak Bay. This is a 49% reduction from the standard buffer
.
2. Mitigation will include:
a. Removal of a shoreline revetment composed of car tires located in Oak Bay
on the east side of the parcel.
b. Planting native vegetation within the shoreline buffer to re-establish a riparian
zone along the Type S water. Plantings will be composed of Western red
cedar seedlings (Thuja plicata) on a 12’ x 12’ spacing between the OHWM
and the top of the slope above the shoreline. These plantings will consist of #2
or larger seedlings and will be protected from animal browse with a physical
barrier. These trees will be monitored for survival for three years.
c. In addition, all elements of the mitigation requirements for wetlands will be
implemented in the design of the single family residence including:
Table 18.22.730(1)(b). Required Measures to Minimize Impacts to Wetlands
(All measures are required if applicable to a specific proposal)
Disturbance Required Measures to Minimize Impacts
Lights • Direct lights away from wetland
Noise • Locate activity that generates noise away from wetland
• If warranted, enhance existing buffer with native vegetation plantings
adjacent to noise source
• For activities that generate relatively continuous, potentially disruptive noise,
such as certain heavy industry or mining, establish an additional 10 feet
heavily vegetated buffer strip immediately adjacent to the outer wetland
buffer
Toxic runoff • Route all new, untreated runoff away from wetland while ensuring wetland is
not dewatered
• Establish covenants limiting use of pesticides within 150 feet of wetland
• Apply integrated pest management
Stormwater
runoff
• Retrofit storm water detention and treatment for roads and existing adjacent
development
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Table 18.22.730(1)(b). Required Measures to Minimize Impacts to Wetlands
(All measures are required if applicable to a specific proposal)
Disturbance Required Measures to Minimize Impacts
• Prevent channelized flow from lawns that directly enters the buffer
• Use low intensity development techniques (for more information refer to the
drainage ordinance and manual)
Change in water
regime
• Infiltrate or treat, detain, and disperse into buffer new runoff from impervious
surfaces and new lawns
Pets and human
disturbance
• Use privacy fencing or plant dense vegetation to delineate buffer edge and to
discourage disturbance using vegetation appropriate for the ecoregion
• Place wetland and its buffer in a separate tract or protect with a conservation
easement
Dust • Use best management practices to control dust
The mitigation implemented will restore the functions and values of the adjacent estuarine
wetland by eliminating the tire revetment within Oak Bay and by re-establishing a native
vegetation riparian zone within the shoreline buffer.
No direct impacts to the adjacent estuarine wetland will occur and the proposed mitigation will
increase the density and structural diversity of native vegetation within the 76-foot shoreline
buffer over the current condition which would remain the same if a standard buffer was
implemented.
SUMMARY
Remote review of available wetland mapping, historic aerial photography, and on-site
investigation of the subject parcel for the purposes of wetland delineation indicates there is one
regulated wetland within 150 feet of proposed residential construction on the parcel.
On-site investigation determined that the vegetation community, soils and hydrology on the
remaining portion of parcel 962700097 do not meet the criteria for wetland characteristics
published by the U.S. Army Corps of Engineers, Western Valleys and Mountains Regional
Supplement to the Federal Wetland Delineation Manual adopted by Jefferson County.
In order to establish a single-family residence within 76 horizontal feet of the regulated wetland,
the applicant is proposing the implementation of a Mitigation Plan that will restore shoreline
functions by removing a revetment composed of car tires, restoration of the riparian zone within
the established buffer, and implementation of required measures to minimize the impacts to
wetlands.
October 31, 2022 TIM MURRAY WETLAND DELINEATION PARCEL 962700097, JEFFERSON
COUNTY, WASHINGTON.
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David S. Parks M.S.
Hydrogeologist/Certified Professional Wetland Scientist
LG, LEG, LHG #533/ PWS#1623
Crescent Environmental PLLC
424 East First Street, Box 429
Port Angeles WA 98362
Telephone: 360-640-3187
Email: crescentenvironmental@gmail.com
Limitations
This report was prepared for the sole use of client Tim Murray, and should not be reproduced
without his express permission. Maps and figures contained in this report have been prepared for
the purposes of displaying wetland areas and associated landscape features and do not purport to
represent or portray a legal survey. Users of this report are responsible for independently
verifying the location, size, and characteristics of features displayed. This report was prepared
using methods and standards generally accepted by the environmental consulting industry. No
other warrantees expressed or implied are given.
October 31, 2022 TIM MURRAY WETLAND DELINEATION PARCEL 962700097, JEFFERSON
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References
Cowardin, L.M., V. Carter, F.C. Golet, and E. T. LaRue. 1979. Classification of Wetlands and
Deepwater Habitats of the United States. FWS/OBS-79/31. U.S. Fish and Wildlife Service.
McCreary, F.R., 1975. Soil Survey of Jefferson County Area, Washington. United States
Department of Agriculture, Soil Conservation Service. (NRCS).
Munsell Color, 2000. Munsell Soil Color Chart. Munsell Color. 4300 44th Street, S.E., Grand
Rapids, MI 49512.
Natural Resource Conservation Service (NRCS) 2022. Web Soil Survey.
USACE, 1987.United States Army Corps of Engineers, Wetland Delineation Manual. U. S.
Army Corps of Engineers, Vicksburg, Mississipi.
USACE, 2010. Regional Supplement to the Corps of Engineers Wetland Delineation Manual:
Western Mountains, Valleys, and Coast Region (Version 2.0). U.S. Army Corps of Engineers,
U.S. Army Engineer Research and Development Center Environmental Laboratory, Vicksburg
MS. ERDC/EL TR-10-3.
USFWS, 2022. United States Fish and Wildlife Service, On-Line National Wetlands Inventory
Mapping.
WDOE, 2015. Washington State Wetland Rating System for Western Washington. Publication #
14-060-029. Washington Department of Ecology, Olympia, Washington.
Weinmann, F., M. Boule, K. Brunner, J. Malek, and V. Yoshino., 1984. Wetland Plants of the
Pacific Northwest. U.S. Army Corps of Engineers, Seattle District.
Wetland Training Institute (WTI) 2011. Pocket Guide to Hydric Soil Field Indicators.
October 31, 2022 TIM MURRAY WETLAND DELINEATION PARCEL 962700097, JEFFERSON
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Figure 1: Location of Subject Parcel at 102 Cleveland Street, Jefferson County, Washington.
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Figure 2. Site topography based on LiDAR bare earth Digital Elevation Model.
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Figure 3: Soils Mapping for the Subject Parcel. Symbol (Td) indicates Tidal Marsh (hydric)
soils. Symbol (Tuc) indicates Tukey sandy, gravelly loam (non-hydric) soils.
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Figure 4. Wetland mapping from Jefferson County ArcGIS Mapping Tool.
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Figure 5: National Wetlands Inventory Mapping of the Subject Parcel
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Figure 6: 1942 Ortho-photograph of the Subject Parcel,
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Figure 7: 1951 aerial photograph of the Subject Parcel.
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Figure 8: 1989 aerial photograph of the Subject Parcel
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Figure 9: 2006 aerial photograph of the subject parcel.
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Figure 10: 2009 aerial photograph of the subject parcel.
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Figure 11: 2011 aerial photograph of the subject parcel.
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Figure 12: 2013 aerial photograph of the subject parcel.
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Figure 13: 2015 aerial photograph of the subject parcel.
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Figure 14: 2017 aerial photograph of the subject parcel
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Figure 15: 2021 aerial photograph of the subject parcel.
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Figure 16: 1977 Oblique Aerial Photograph (WDOE, 2022). Approximate parcel boundaries are
shown in yellow.
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Figure 17: 1990 oblique aerial photograph of the subject parcel (shown in yellow). WDOE,
2022.
Figure 18: 2000 oblique aerial photograph of the subject parcel (shown in yellow), (WDOE,
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2022).
Figure 19: 2006 oblique aerial photograph of the subject parcel (shown in yellow), (WDOE,
2022).
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Figure 20: 2016 oblique aerial photograph of the subject parcel (shown in yellow), (WDOE,
2022).
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Figure 21: Subject Parcel Plot Locations and Proposed Critical Area Buffer.
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Appendix A: Plot Data (Plants, Soils, Hydrology)
(Note: Plot locations are shown on Figure 21)
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APPENDIX B: Wetland Rating for Western Washington Forms (WDOE).
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