HomeMy WebLinkAboutHabitat Management Plan 502151018WESTECH COMPANY
Environmental Consulting - Site Permitting
MITIGATION AND HABITAT MANAGEMENT PLAN
240 ROBINSON ROAD
ASSESSOR'S PARCEL # 502-15-1018
JEFFERSON COUNTY, WASHINGTON
April 2020
G. Bradford Shea, Ph.D.
Trevor J. Shea, CWD
Submitted to:
JEFFERSON COUNTY
DEPARTMENT OF COMMUNITY DEVELOPMENT
621 Sheridan Street
Port Townsend, Washington 98368
Submitted by:
WESTECH COMPANY
Port Angeles, Washington 98362
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JUN 3 0 2020
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JEFFERSON COUNTY
Offices: Port Angeles, Washington, Winston, Oregon, Cottonwood & Rocklin California
Telephone: (360) 565-1333
Main Office: P.O. Box 1239, Winston, OR 97496
email: brad@westechcompany.com
MITIGATION AND HABITAT MANAGEMENT PLAN
240 ROBINSON ROAD
ASSESSOR'S PARCEL # 502-15-1018
JEFFERSON COUNTY, WASHINGTON
April 2020
G. Bradford Shea, Ph.D.
Trevor J. Shea, CWD
Copyright 2020 by G. Bradford Shea, Westech Company — All Rights Reserved
Submitted to:
JEFFERSON COUNTY
DEPARTMENT OF COMMUNITY DEVELOPMENT
621 Sheridan Street
Port Townsend, Washington 98368
Submitted by:
WESTECH COMPANY
Port Angeles, Washington 98362
CONTENTS
CHAPTER/SECTION PAGE NO,
1.0 INTRODUCTION
1
1.1 Background
1
1.2 Proposed Project
6
1.3 Regulatory Framework
6
2.0 APPROACH AND METHODS
8
2.1 Approach
8
2.2 Methods
8
3.0 IDENTIFICATION AND POTENTIAL EFFECTS
ON PROTECTED SPECIES 10
3.1 Threatened and Endangered Species for Puget Sound
and Strait of Juan de Fuca 10
3.2 Conclusion — Threatened & Endangered Species 18
4.0 MITIGATION PLAN
19
4.1 Regulatory Setting
19
42 Existing Conditions
21
4.3 Project Impacts
24
4.4 Plan Components
25
4.5 Detailed Mitigation Measures
26
4.6 Implementation and Timing
27
4.7 Mitigation Monitoring
27
4.8 Contingency Plan
29
5.0 ON -SITE WETLAND AND BUFFER PLANTING PLAN
30
5.1 On -Site Conditions
30
5.2 Buffer Planting and Restoration Plan
30
6.0 CONCLUSIONS AND RECOMMENDATIONS
35
6.1 Conclusions
35
6.2 Recommendations
35
7.0 REFERENCES
37
VWV1637-RobinsonRdl- MP.TOC/042020/mas
CONTENTS
CHAPTERISECTION
PAGE NO.
TABLES
Table 1. Threatened and Endangered Species for Puget Sound
And Strait of Juan De Fuca 11
Table 2. Existing Native Plant Species at the Site 31
Table 3. List of Native Plants for Buffer Mitigation and Enhancement 33
FIGURES
Figure 1.
Location Map
2
Figure 2.
Vicinity Map
3
Figure 3.
Parcel Map
4
Figure 4.
2015 Aerial Map
5
Figure 5.
Site Plan
7
Figure 6.
Soil Map
23
Figure 7.
Planting Areas
32
APPENDICES
Appendix A— Site Photographs
VVVV1637-RobinsonRdHMP300042020lmas
A-1
1.0 INTRODUCTION
1.1 BACKGROUND
The Property (Site) is located at 240 Robinson Road, Brinnon, on Hood Canal in
Jefferson County Washington. The Property is owned by Charles and Theresa
Crowell who are presently located in Kingston, Washington (Jefferson County
2020a). The subject property (hereafter designated as "Site" or "Property") located
at 240 Robinson Road has an existing residence (single wide mobile home) and
storage shed. The Site is recorded as Assessor's Parcel # 502-15-1018.
The Site lies within Jefferson County, Washington in the NE Quarter of Section 15
of Township 25 North, Range 2 West, W.M. (Figures 1, 2, 3, and 4). The Site is
located roughly three miles south of Brinnon, in an unincorporated area of Jefferson
County. The Site lies on the north side of the Duckabush Estuary at the confluence
of the Duckabush River and Hood Canal.
The Property is a long, rectangular shaped parcel, with an existing residence and
shed. An existing septic system is present which will be replaced, as will the
residence (see Site Plan and Proposed Septic Design in Figure 5).
The Site lies generally north of the Mean Higher High Water Mark (MHHW) of Hood
Canal, with a low bank at the southern end of the property. The property grades
upward on a hillside to the north of Robinson Road, extending from roughly 10 feet
elevation at the base to approximately 85+ feet elevation at the proposed drainfield
location near the north end of the property.
The property consists of a single lot that measures approximately 92 feet by 900
feet. The total loft size is listed as 1.86 acres which appears to include some area
south of the Ordinary High Water Mark (OHWM) (Jefferson County 2020a). The
Parcel location is shown in Figures 1-4.
There is an existing residence which is proposed to be replaced within the existing
footprint. A new septic system will be built, with a septic tank on the north side of
the residence. A pump system will be installed near the residence, pumping
effluent to a new drainfield, to be located on the north portion of the parcel, outside
of the shoreline buffer zone.
The Property is designated as Conservancy by the Jefferson County Shoreline
Master Program (Jefferson County 2020b). This shoreline designation requires a
standard 150 foot setback from OHWM plus an additional 10 foot setback for
structures. Nearby portions of the Duckabush Estuary shoreline, located west of
the property, are designated as "Natural" which require additional protection. This
includes estuarine wetlands.
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1.2 PROPOSED PROJECT
The Property currently contains an existing residence, a small shed and an existing,
septic system. The owner intends to replace the existing residence within the
existing footprint (Figure 5). The current proposal is the replacement of that
residence and the construction of a new septic system for the residence, with the
drainfield to be placed outside of the buffer zone (Figure 5).
Planned construction activities will occur within the 200 foot shoreline zone. This
Habitat Management Plan (HMP) outlines proposed measures to mitigate potential
impacts which may affect the shoreline zone as per Jefferson County regulations.
This Plan is intended to accomplish "No Net Ecological Loss" as required by the
Code.
1.3 REGULATORY FRAMEWORK
The marine shoreline along this Property is considered a Shoreline of Statewide
Significance and has been designated as Critical Habitat for Hood Canal Summer
Chum and Puget Sound Chinook salmon (50 C.F.R. 226), The Shoreline is
classified as a "Fish and Wildlife Habitat Conservation Area" (FWHCA) by
Jefferson County, requiring a 150 foot buffer from the OHWM.
It is the intention of the owner to construct a new septic system on the Site (see
Figure 5). Any residential renovation or replacement will occur within the footprint
of the existing residence (see Figure 5).
During the construction of the proposed septic system, the Project will disturb
surface soils and some existing vegetation. The Property owner has contracted
with Westech Company (Westech) to satisfy the County's requirements with regard
to Critical Areas and Shoreline Buffer Requirements through preparation of this
Habitat Management Plan (HMP). Preparation of a Wetland Delineation Report is
also required by the County Jefferson County 2020d). This document (Westech
2020b), will be submitted under separate cover).
This Report constitutes an HMP which describes existing conditions on the Site,
define the impacts of development, and outline a management proposal to maintain
and enhance the existing functions and values of the buffer and its associated
watershed and to ensure "No Net Ecological Loss of Shoreline Functions"
(RCW36.70A.480).
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2.0 APPROACH AND METHODS
2.1 APPROACH
The approach for this investigation into the impacts of development of this Site
included a detailed review of County Assessor's parcel maps, Critical Area Maps,
and aerial photographs of the Site. As a FWHPA, it referenced Fish and Wildlife,
mapped locations of ESA (Endangered Species Act) listed species' critical habitat
by NOAA-NMFS (National Marine Fisheries Service) and topographic maps of the
area.
A Site Plan and septic design prepared by Creative Design Solutions (CDS 2020)
was also reviewed and utilized to help define proposed planting areas (see Section
4.3 and Figure 5).
Westech's field investigations for the Habitat Management Plan (HMP) were carried
out during March 2020 by Mr. Graham Nott as directed by Dr. G. Bradford Shea,
Principal Ecologist in coordination with the owners and their septic designers
(Creative Design Solutions (CDS)).
During Site visits, the Property was inspected, and Site characteristics were noted.
Relevant measurements were taken for mapping purposes, photographic
documentation of the Site was acquired, and potential mitigation was identified.
Updated plans and studies cited above were reviewed as available to Dr. Shea
during the period of March - April 2020.
2.2 METHODS
Westech's field reconnaissance involved examining the existing conditions found at
the Site. This included reviewing the area proposed for re -development in relation
to the natural features found on -site. Botanical studies were conducted involving
identification of plant species that could be found growing at the Site. Site
measurements were taken (including dimensions of proposed planting areas) using
fiberglass and steel tape measures and GPS technology.
WVV1637RobinsonRdHM P. RPT/042020/mas 8
A qualitative assessment of the landscape was conducted to determine the
presence of invasive species, the composition and characteristics of plants in the
critical area, evidence of historical land uses, the slope of lands adjacent to critical
areas, soil textures and stability and an assessment of the role of existing
vegetation in supporting soil stability. Westech also assessed the extent of existing
human disturbance in the critical areas. This information was used to assess the
potential impacts of the proposed project.
This HMP has been formulated to assure "No Net Ecological Loss" within the
shoreline zone and to "maintain or enhance the existing functions and values of the
associated watershed" (Jefferson County Code, Chapter 18.25 2018c; RCW
36.70A.480). Chapter 3.0 discusses the protected species and how the Project
may impact them. Chapter 4.0 describes the shoreline zone as well as goals and
objectives of this HMP and the performance standards that will be utilized to assess
the effectiveness of this Plan. Chapter 5.0 describes the Planting Plan for native
plant species which is the basis for offsetting potential impacts
This Plan is intended to restore and enhance the integrity of the Site by improving
the quality of habitat within the shoreline buffer zone. This will involve erosion
control during construction and through planting of additional native vegetation at
the Site. These recommendations have been formulated to be implemented in
accordance with recommendations for erosion control and preparation of HMPs
within the shoreline zone (Jefferson County Code, Chapter 18.25) Jefferson County
2020c)).
WW1637RobinsonRdHMP. RPT/042020/mas
3.0 IDENTIFICATION AND POTENTIAL. EFFECTS
ON PROTECTED SPECIES
An endangered species is any species which is in danger of extinction throughout
all or a significant portion of its range, and a threatened species, is any species
which is likely to become an endangered species within the foreseeable future
throughout all or a significant portion of its range (Endangered Species Act (ESA)
1973). Affecting any threatened or endangered species is considered a "take"
under the ESA. A "take occurs if a listed species is harassed, harmed, pursued,
hunted, shot, wounded, killed, trapped, captured, or collected, or from an attempt to
engage in any such conduct.
"Take" comes in two forms: 1) incidental take that is approved through consultation
with responsible federal agency in the form of a Biological Opinion (Section 7), or 2)
any "take" under a Habitat Conservation Plan (Section 10) and/or unauthorized
"take (Section 9) of the ESA. Habitats used by listed species are also protected by
the ESA, classified as Critical Habitat. Adverse modification of Critical Habitat is
also an unauthorized "take" of the listed species.
Protective regulations prohibiting unauthorized "take" of listed species are known as
the 4(d) rules. When endangered species are listed, the prohibition of unauthorized
"take" is also made effective at the same time. In addition, protective regulations for
threatened species may be published at a later date after listing.
3.1 THREATENED AND ENDANGERED SPECIES FOR PUGET SOUND
AND STRAIT OF JUAN DE FUCA
A species list for Puget Sound was compiled from the National Oceanic and
Atmospheric Administration (NOAA) National Marine Fisheries (NMF West Coast
Region) as well as the U.S. and Washington Department of Fish and Wildlife
(USFWS and WDFW). There are eight fish species, six bird species, three marine
mammal species, and four amphibian or reptile species that were listed on at least
one of these lists and have a potential territory near the Project Site. The following
section is a discussion of these species and the likelihood of potential impact from
the proposed Project. A list of all ESA listed species in Puget Sound and the Strait
of Juan de Fuca can be found in Table 1.
Fish
There are eight listed species of fish that are listed within the Puget Sound region.
These species include Bull Trout, Chinook Salmon (Puget Sound), Chum Salmon
(Hood Canal), Eulachon, Green Sturgeon, Steelhead (Puget Sound), and Yellow -
Eye Rockfish. Seven of these species are listed as "threatened", while one, the
Bocaccio Rockfish, is listed as "endangered"
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Salmonids
There are four different species of salmon located in the Puget Sound Evolutionary
Significant Unit (ESU) that are federally listed as "threatened". Puget Sound
Chinook salmon (O3coi-hynchus tshawytscha) and Hood Canal Chum salmon
(Oncorhynchus keta) were both listed as threatened on June 28, 2005.
Most Chinook spawn in large rivers, such as the Duckabush River. They will also
use small, coastal streams with sufficient water flow for spawning.
Chum salmon typically use small coastal streams as well, or in the lower reaches of
large rivers. Chum usually stay closer to salt water than Chinook do. Spawning
runs generally begin in spring and summer, although some fish closer to the ocean
will begin in early fall. Chum salmon along the Strait of Juan de Fuca and Hood
Canal have a spawning run during the summer (NOAA 2020).
Puget Sound Steelhead (Oncorhynchus mykiss) was listed as "threatened" on May
11, 2007. Steelhead generally prefer fast water in small -to -large mainstream rivers,
and medium -to -large tributaries. Puget Sound Steelhead originate below natural
and manmade barriers in rivers that flow directly into Hood Canal (NOAA 2020).
Bull Trout (Salvelinus confluentus) are also a salmonid and was listed as
"threatened" in 1999. They require colder water temperatures than most salmonids
and are, therefore, mostly found in deeper marine waters and cold, clean, fast
moving streams and rivers. They also require complex habitats for shelter and
foraging (NOAA 2020).
Hood Canal supports the above listed salmonid species. These salmonids require
large perennial rivers and streams (such as the Quilcene, Dosewallips and
Duckabush Rivers) for their spawning runs. However, the proposed project will be
located on an existing residence footprint and back from the shoreline
(approximately 50 feet) and a septic system located on the north side of the existing
residence, away from the water. The drainfield will be placed outside of the
shoreline zone, Therefore, our determination is that that the proposed Project "may
affect, not likely to affect" these fish.
Rockfish
There were three species of rockfish that are listed on the ESA species list. The
Bocaccio Rockfish (Sebastes paucispinis) was listed as "endangered" in the Puget
Sound/Georgia Basin Distinct Population Segment (DPS) in 2010. Canary
Rockfish (Sebastes pinniger) and Yellow -eye Rockfish (Sebastes ruberrimus) were
both listed as "threatened" in the Puget Sound/Georgia Basin DPS in 2010 as well.
However, due to recent genetic testing that shows a lack of "discreteness" from the
genetic makeup of Canary Rockfish on the coast, NOAA has proposed that it be
removed from the ESA Threatened and Endangered Species list (NOAA 2020).
I/VVV1637RobinsonRdHMP. RPT/042020/mas 13
Although juvenile rockfish tend to be more than adults in shallower water, rockfish
make their home on the ocean floor, generally between 80 to 820 feet deep. They
remain in the deep saltwater areas their entire lives, and do not wander into
freshwater streams or rivers. Therefore, it is extremely unlikely that any rockfish
would be found along the Hood canal shoreline and therefore, we believe that a
"will not affect" determination for effects of the Project on these species is
justified.
Eulachon and Green Sturgeon
Eulachon (Thaleichthys pacificus) is an anadromous fish found along the Pacific
coast from California to Alaska. These smelt were federally listed as "threatened"
on March 18, 2010; however, they were not considered for potential impact on this
Project because their Critical Habitat for Southern DPS is mainly along a large
section of the Columbia River, with a lesser presence in the Quinault and Elwha
Rivers (NOAA 2019). They do not have a recorded presence in the Puget Sound
and therefore we believe that the proposed Project "will not affect" the federally
listed Eulachon species.
On April 7, 2006, the Southern DPS of Green Sturgeon (Acipenser medirostris) was
listed as "threatened" under the ESA (NOAA 2020)_ On October 9, 2009, the final
Southern DPS Green Sturgeon Critical Habitat was designated. This includes
marine waters, estuaries, harbors and rivers along the Pacific Coast from California
to Washington. However, the only Critical Habitat in Washington is listed as
"Willapa and Grays Harbor as well as the Lower Columbia River Estuary from the
mouth to River Mile (RM) 74" (NOAA 2020). Since the Puget Sound area is not
designated as Critical Habitat and the Green Sturgeon DPS is not mapped near the
Project Site, we have given a "will not affect" determination for this species.
Birds
There are six species of birds listed on WDFS's state ESA species list that may
have territory near the Project Site (species that are listed but do not occur near the
Project Site were not included). These species include the Ferruginous Hawk
(Buteo regalis), Marbled Murrelet (Brachyramphus marmoratus), Northern Spotted
Owl (Strix occidentalis), Streaked Horned Lark (Eremophila sopestris strigata),
Yellow -Billed Cuckoo (Coccyzus americanus) and the Tufted Puffin (Fratercula
cirrhata). The Northern Spotted Owl, the Streaked Horned Lark, and the Tufted
Puffin are all listed as "endangered" on the state WDFW list, while the Ferruginous
Hawk and Marbled Murrelet are both listed as "threatened". The Yellow --Billed
Cuckoo is listed as a "candidate" with the state list but is classified as "threatened"
on the federal list (See Table 1).
VVW1637RobinsonRdHMP.RPT/042020/mas 14
Ferruginous Hawk
The Ferruginous Hawk was given state status of "threatened" in 1983 and there
has been a recovery plan in place since 1996. They inhabit semi -arid, prairie
ecosystems of western North America, and they build their nests on cliffs, rocky
outcrops, small trees and transmission line towers. Washington State is on the
northwestern edge of their breeding range, and nests in Washington are generally
found in steppe or shrub -steppe habitat (WDFW 2020). Although there are trees
and transmission line poles and towers within the Project vicinity, since the Project
Site is not located in a semi -arid, prairie ecosystem, and since there have not been
any reported sightings of the Ferruginous Hawk in the vicinity of the Site, the impact
of the proposed project to this species is negligible. Furthermore, the proposed
Project consists of the replacement of a mobile home on an existing residence
footprint and a new septic tank and pump system within the shoreline zone. The
Project will occur in an area already developed with other residences and is devoid
of any potential significant nesting objects. Therefore, we feel comfortable giving a
determination of "will not affect" in regard to this species and the proposed
Project.
Marbled Murrelet
The Marbled Murrelet was federally listed as "threatened" in 1992, with its Critical
Habitat designated in 1996. In Washington State, the species occurs in the
greatest numbers in the Puget Sound and Strait of Juan de Fuca. Marbled
Murrelets nest inland in forests that largely consist of thick forest with trees that
have large branches to support their nests. Murrelets nest in tree stands varying in
size between several acres to several thousand acres, generally several miles
inland (WDFW 2020).
Since the Project Site is located near a shoreline (Hood Canal) it is very unlikely
that there are nests of the Marbled Murrelet in the vicinity. The project also sits
back from the shoreline, roughly 50 feet above Ordinary High Water. Therefore; it
is our determination that the proposed project can be determined that it "may
effect, not likely to affect" this species.
Northern Swotted Owl
The Washington population of the Northern Spotted Owl was federally listed as
threatened under the ESA in 1990. Areas of critical habitat were designated in
1992 and 2008 to further protect the species. Northern Spotted Owls typically
inhabit older forested habitats with moderate to high canopy enclosure (60 to 90
percent), so as to provide cover and protection from predators. These owls have a
very large range for breeding (1,000 acres plus) (WDFW 2020).
VVVV1637Robins0nRdHMP. RPT/042020/mas 15
Due to their large range, there are certainly forests that meet the owl's nesting
criteria within 5-10 miles of the Project Site. However, there is no observed
evidence of the owl or its nests or owl habitat near the Site. Therefore a "will not
affect" determination is justified.
Streaked Horned Lark
The Streaked Horned Lark was federally listed as a "candidate" for listing under the
ESA in 2001. It was officially listed as "Threatened" in 2013. The population of the
larks had their initial significant population decline when the Native Americans of
the past ceased to regularly burn the prairie grasslands, with trees replacing that
habitat and pushing the larks further back. This change in habitat has continued
with the conversion of the grasslands into agricultural and residential use. The lark
nests on the bare ground in sparsely vegetated sites dominated by grasses and
shrubs, with the heaviest concentration currently in the southern lowlands of Puget
Sound. Due to the changes in their habitat, the larks are often found at airports and
military bases where the grass fields that they require are maintained. There are
only 8 known nesting sites in the Puget Sound area (WDFW 2005, 2020).
The Streaked Horned Lark's known nesting locations are not within the vicinity of
the Site (northern Puget Sound), they appear to be nearly 100 miles away. The
topography and vegetation in the immediate area surrounding the Site is not
conducive to the lark's preferred nesting requirements, we believe that a "will not
affect" determination is justified.
Yellow -Billed Cuckoo
The Yellow -Billed Cuckoo was listed on the federal ESA list as "threatened" in
2014. Washington State has recommended that it be listed on the State ESA list as
"threatened", although that has not been officially confirmed. There have only been
20 confirmed sightings of the Yellow -Billed Cuckoo in Washington since the 1950's
and those were likely non -breeding migrants. However, due to the lack of surveys
of the species, it was recommended that it be listed on the state list (WDFW 2020).
Since there is no breeding within a significant area around the Project Site, we feel
comfortable in giving a "will not affect" determination for this species in regard to
the proposed Project.
Tufted Puffin
The Tufted Puffin was unanimously voted to be approved for Endangered Status by
the Washington State Fish and Wildlife Commission in 2015. This species is under
review on the federal list with no decision posted as of February 2020. This bird has
been seen throughout the Western Washington and resides near the sea.
VVW1637Robinson Rd H M P. RPT/042020/mas 16
Since the Project Site is located near a shoreline (Hood Canal) it is possible but
highly unlikely that there are nests of the Tufted Puffin in the vicinity. This species
typically nests in large groups on rocky islands in the ocean (WDFW 2020). Site
investigations also found no evidence of nests near the Project Site. The project
also sits 50 feet back from the shoreline, within an existing residential footprint in an
area of other residences. Therefore, it is our determination that the project can be
determined that it "may effect, not likely to affect" this species.
Marine Mammals
There are three marine mammals that are listed on the ESA list in the Puget Sound
area. The Gray Whale (Eschrichtiu robustus) is listed as "sensitive" under the State
status but has no federal listing. Both the Killer Whale (Orcinus Orca) and the
North Pacific Right Whale (Eubataena japonica) are listed as "endangered" under
both state and federal lists (WDFW 2020).
Despite the presence of these whales in the Puget Sound and the Strait of Juan de
Fuca, since the proposed Project is located approximately 112 feet from the
nearest shoreline and since it is a septic system and replacement of an existing
mobile home on an existing footprint, being constructed amongst other previously
constructed residences, we have determined that the proposed Project "will not
affect" these mammals.
Amphibians and Reptiles
The Green Sea Turtle (Chelonia mydas), the Leatherback Sea Turtle (Dermochely
coriacea), and the Loggerhead Sea Turtle (Caretta caretta) are all listed under the
ESA. The Green Sea Turtle is listed as federally "threatened", while both the
Leatherback and Loggerhead Sea Turtles are federally listed as "endangered"
(WDFW 2020). However, as with the whales, sea turtles will not be found near
deep water and therefore will not be near the Project Site. We feel comfortable
giving a "will not affect" determination in regard to these species.
The Northern Leopard Frog (Lithobates pipiens) is listed as "endangered" under the
state list. However, further investigations found that this frog can only be found in
two locations in Washington State. Both locations (Potholes Reservoir and Gloyd
Seeps) are located in the Columbia Basin Wildlife Area in Grant County and are,
therefore, not in the vicinity of the Project Site. Therefore, we feel comfortable
giving a "will not affect" determination for this species for the proposed Project.
WW1 637RobinsonRd HM P. RPT/042020/mas 17
3.2 CONCLUSION — THREATENED & ENDANGERED SPECIES
As discussed above, many of the species listed on the ESA will not be impacted at
all by the proposed Project. As for the species that were given a "may affect, not
likely to affect" determination, we do not believe that significant mitigation
measures are necessary for this Project, beyond those recommended in this
Habitat Management Plan.
Located on Hood Canal at the mouth of the Duckabush River, the Project Site is the
replacement of a single wide mobile home on an existing residential footprint, with a
proposed new septic tank and pump system (behind the home away from the
water) in an area already developed with other residences. Field investigations
found that the residence will be replaced within the 150 foot buffer zone.
Figures 3 and 4 show the Project Site, as it is mapped and observed in the field.
Chapters 4.0 and 5.0 include Mitigation Measures which will be implemented
including erosion control and planting native plants in the shoreline buffer zone.
FEMA Reauirements
The Federal Emergency Management Agency (FEMA) has certain requirements for
Habitat Assessments in flood zones which occur near the Ordinary High Water
Mark (OHWM), near the Project Site. Primary Constituent Elements (PCEs)
including Endangered Species and Habitats are discussed in Section 3.1 above.
The specified Mitigation Measures are discussed in Chapters 4.0 and 5.0.
The Project is not expected to affect water quality, including water temperature and
dissolved oxygen in the marine waters adjacent to the Project, provided that Best
Management Practices (BMPs) are used during construction. In addition, standard
Mitigation Measures should be implemented during the construction of the Project.
The recommended Mitigation Measures are discussed in Chapters 4.0 and 5.0.
Chapter 5.0 discusses restoration of the Vegetative Community and mitigation of
effects through a Buffer Planting Plan including planting of additional native species
around the proposed home --site.
WVV1637RobhsonRdHMP.RPT/042020/mas 18
4.0 MITIGATION PLAN
4.1 REGULATORY SETTING
There are several jurisdictional issues related to the development of this parcel of
land. The Site is a low bank site with access directly to the beach and shoreline.
Shoreline processes in the area include periodic scouring and deposition,
however, the property is at the mouth of the Duckabush River, in a semi -
sheltered low energy shoreline environment, which limits periodic changes in the
location of the shoreline.
The Site is zoned Rural Residential (RR-5). The purpose of Rural Residential
zoning is to provide areas of low density residential use, free from commercial,
industrial or moderate density residential development (JCC 12,27). Many of the
lots in the area range from less than 1.0 acre to several acres in size,
The Site is located along a section of shoreline that is considered a "Shoreline of
Statewide Significance" and is regulated under Jefferson County's Shoreline
Master Program (Jefferson County 2020c). This shoreline has been designated
under the Shoreline Master Program (Section 18.25 JCC) as having a
Conservancy shoreline environmental designation. Areas to the west and south
of the site have a "Natural" shoreline designation, which requires additional
protection. These areas include estuarine wetlands at the mouth of the
Duckabush River.
Shoreline Residential (SR) areas are areas landward of the Ordinary High Water
Mark (OHWM) that are characterized as predominantly single family residential
development or are platted for such development. That includes the Site and
nearby properties along Robinson Road.
While there are tic) landslide hazards shown on most of the Site, there is a High
Landslide Hazard followed by a Slight Landslide Hazard area in the upper
(northern) portion of the Site, according to County maps. This area is limited in
extent, but it could be affected by any increase in stormwater runoff. Such runoff
should be intercepted and dispersed if possible or routed toward the beach in a
tight -line, as may be required by the County.
There are no erosion hazard zones mapped on the Site_ There are no streams
or other watercourses mapped by Department of Natural Resources (DNR)
mapping. There is a non -fish stream mapped two properties west of the Site and
the Duckabush River mouth is located within a quarter mile to the southwest.
WW1637RobinsonRdHMP. RPT/042020/mas 19
Under the Jefferson County Shoreline Master Program, the standard buffer zone
for rural residential structures is 150 feet from the Ordinary High Water Mark,
plus a 10 foot building setback. The Site has an existing residence and qualifies
for an exemption to this rule if the mobile home is replaced within the existing
footprint.
A portion of the Site is mapped within a mapped FEMA Flood Zone (Zone A).
This is the area south of the Ordinary High Water Mark, along the marine
shoreline of Hood Canal. Jefferson County maps also that shoreline as
containing wetlands. Field investigations discovered a beach area on the Site.
There are estuarine wetlands within about 150 feet west and south of the Site
(Jefferson County 2020).
This shoreline has been designated "critical habitat" for threatened salmonid
species, specifically the Puget Sound Chinook, Hood Canal Summer Chum,
steelhead and bull trout. These listings come from the National Marine Fisheries
Service (NMFS) pursuant to the Endangered Species Act (ESA).
The Growth Management Act (RCW36.70A.480) mandates that the County
protect such critical areas. Jefferson County carries out this mandate by
classifying this shoreline as a "Class 1 Fish and Wildlife Habitat Conservation
Area (FWHCA). These areas are considered to be of "critical importance to the
maintenance of endangered, threatened or sensitive species of fish, wildlife,
and/or plants (JCC18,25). Required buffers for this designation are 150 feet
from the OHWM in accordance with the County's Critical Areas Code (Jefferson
County 2018b, JCC 18.22).
Due to the presence of federally Threatened or Endangered species in the
Aquatic Zone the shoreline is considered a Critical Area (JCC18.22) (Jefferson
County 2020b). For the residential intensive shoreline, a buffer of under 150 foot
may be established under certain conditions. Such buffers may be reduced
upon County approval of an acceptable Habitat Management Plan (to a 112.5
foot buffer).
Landowners may obtain a reduction in the size of the buffer required for
FWHCAs. The administrator may reduce buffer widths on a case -by -case basis
provided that standards are met for avoiding and minimizing impacts and that the
buffer reduction does not "adversely affect the habitat functions and values of the
adjacent Class I FWHCA. Any projects that alter, decrease or average the
standard buffer" require an accompanying Habitat Management Plan (HMP).
Homes to be reconstructed or replaced are exempted from the buffer
requirements if they are "grandfathered" in place by previous existing regulations
and if the home is replaced or reconstructed within the existing footprint in
accordance with County regulations.
WW1637RobinsonRdHMP.RPT/042020/mas 20
Because this project involves elements to be built within the standard buffer area,
but in line with or behind previously constructed features and an an existing
house footprint, an HMP is regUired to mitigate and offset any adverse ecological
effects.
This document is also the best way to meet the intent of RCW36.70A.480 which
provides for Jefferson County to make a determination of "No net loss of
ecological functions" with or without mitigation, for renovation of existing
shoreline structures. This document includes a "No Net Loss" ecological
evaluation, proposed Mitigation Measures to offset impacts and a Habitat
Management Plan (Planting Plan) to assure long-term health and ecological
productivity of the buffer zone.
These documents (HMPs) must include maps showing the proposed
development Site and its relationship to surrounding topographic features; the
nature and density of the proposed development; and the boundaries of forested
areas, The report shall also describe the density and nature of the proposed
development in enough detail to allow analysis of impacts on identified fish and
wildlife habitat.
The HMP report must also describe how any adverse impacts resulting from the
project will be mitigated. Possible Mitigation Measures may include, but are not
limited to, establishing buffer zones, preserving plant and tree species, limiting
access to habitat areas, seasonally restricting construction activities and
establishing a timetable for the periodic review of the Plan (JCC18.22).
4.2 EXISTING CONDITIONS
The Site is located on Hood Canal, roughly three miles south of Brinnon,
Washington. The area of the parcel is 1.86 acres in size. The recorded parcel
extends roughly to the shoreline of Hood Canal, with a portion of the property below
the OHWM. An existing road (Robinson Road) allows access to the north side of
the property.
Figure 5 shows features on the Site and the proposed new septic system. The
Property currently contains an old septic system and an existing residence (single -
wide mobile home). The Site slopes southward toward the shoreline with the
OHWM roughly 50 feet southward of the existing mobile home. There is a relatively
steep hill north of Robinson Road which, which is vegetated by shrubs and trees.
This hill slopes up to an elevation of roughly 85 feet at the location of the proposed
new drainfield (sand filter). The developed area is vegetated by a few native and
shrugs and trees, various grasses and some non-native landscaping (Table 1).
VWV1637RobinsonRdHMP.RPT/042020/mas 21
The shoreline adjacent to the Property has been designated as critical habitat for
four species listed as threatened under the Endangered Species Act: Those
species are Puget Sound Chinook Salmon, Hood Canal Summer Chum Salmon,
steelhead and bull trout (50 C.F_R. 226).
The Natural Resource Conservation Service (NRCS) has mapped four dominant
soils on and in the immediate vicinity of the Site, including coastal beach soils near
the Ordinary High Water Mark (OHWM) (NRCS 2020) and Tidal Marsh soils to the
west. Because NRCS maps can be inaccurate at this scale it is not possible to
determine the actual boundary between these soils or the specific soils among
these that are found on -site. These soils include (see Figure 6):
Coastal Beaches (Co). This soil is usually very well drained (sand,
gravel and cobble) and has a depth to water table of about 0 - 11
inches. It has a high frequency of flooding. It consists of sands and
gravels to a depth of 60 inches. These soils are subject to influence
of tides and storm waves. These soils are mapped along the beach
and the lower bluff area.
Tidal Marsh (Td). This is a very poorly drained soil derived from
alluvial cones. The soil is typically 0-6 inches of mucky silt loam
overlying up to 60 inches of layers including soils which vary from
stratified sand to silty clay. Depth to a restrictive layer is 80 inches, It
has frequent flooding or ponding due to tidal action and is often
moderately to strongly saline. These soils are found in areas to the
west of the property.
L stair fine sandy loam 0-15 percent slopes L C . This is a
somewhat excessively- drained soil with a depth to water table of
more than 80 inches. Depth to a restrictive layer is 10-20 inches.
Available water storage in the profile is very low (1.7 inches). This soil
type has no frequency of flooding or ponding. The soils are found
across the northwestern portion of the property.
Grove ver ravelly loamy sand 15 - 30 ercent slopes Go❑ . This
is a somewhat excessively drained soil with a depth to water table of
more than 80 inches. This soil type originated from glacial outwash.
It generally contains a restrictive layer at depths 80 inches, which
has a high to very high ability to transmit water (5.95-19.98 in/hr).
This soil type very low available water storage in the profile (2.5
inches) and has no frequency of flooding or ponding. The soils are
found across the upper (northeastern) portion of the property.
The Lystair and Grove soil types occupy most of the northern areas of the Site and
extend onto the adjacent properties to the northwest and northeast respectively.
WW1637RobinsonRdHMP.RPT/042020/mas 22
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The coastal beach soils are mapped along the shoreline and the Tidal Marsh soils
are mapped along the west side and across a portion of the Site south of Robinson
Road. There are no stream channels located mapped on or near the Site.
4.3 PROJECT IMPACTS
The landowner's plan for this Property entails construction of a new septic system a
portion of which will lie within the 150 foot buffer zone (new septic tank and pump
system) as shown on the Site Plan (Figure 5). The existing residence (mobile
homey would be replaced within the existing footprint.
The primary impacts associated with this project are those generally associated
with construction. Figure 5 is a map of the proposed new septic system on the Site.
The existing home footprint, septic tank and driveway are located inside the
standard buffer zone.
The current septic tank and drainfield will be replaced with a new septic system
when approved by the County. The new septic system will be approved by the
Jefferson County Health Department. Any reserve drain -field required by the
County will be located more than 100 feet from the OHWM and will be outside of
the allowed buffer zone. The existing septic tank will be abandoned, as shown in
Figure 5.
The potential impacts of this project will result primarily from the processes of
grading and excavating the areas for the new septic tank and pump system, and
possibly some minor impacts adjacent to the existing residential footprint.
Additionally, impacts may result from the movement of construction vehicles on the
Site, however these impacts will be limited, since replacement of the existing
mobile home will occur on the footprint of the existing home.
These potential impacts may include the following:
The area surrounding the new septic tank and pump system will
experience impacts to soils and surface vegetation. Soil disturbance
caused by the construction process and removal of existing
vegetation in the buffer will occur during on -site grading and
excavation. Additional earth moving and grading during construction
may contribute to increased erosion.
The removal of some native vegetation in the buffer zone. Native
vegetation in much of the buffer zone, has already been removed and
replaced by native and non-native species (mainly grasses). There
may also be soil impacts from the movement of a backhoe and
similar construction vehicles on the Site, however, this will generally
occur behind the existing house footprint away from the shoreline.
WWI 637RobinsonRdHMR RPT/042020/mas 24
Because the new septic tank and pump system will be placed within
buffer zone for the shoreline area, impacts on some shoreline plants
may occur from direct construction activities or from erosion or
siltation runoff from the construction area. This will need to be limited
by erosion control measures since the Site slopes toward the
shoreline.
The historical removal of some native vegetation from the Site has
already resulted in the direct loss of considerable habitat. Many
species of bird, small mammal and insect use native plants for food
sources and refuge. Any further loss of vegetation in the buffer zone
could reduce habitat for these organisms.
The Management Plan below is intended to offset these adverse impacts. The
Mitigation Measures developed in this Plan are intended to compensate for the
impacts to the shoreline habitat and buffer zone.
4.4 PLAN COMPONENTS
The components of the Mitigation Plan include the following:
Erosion control methods will be used to prevent on -Site rill or sheet
erosion from moving sediments toward the adjacent shoreline. This
will be accomplished through project timing and emplacement of
control measures during construction. A silt fence will be placed on
the southern edge of the construction area (south of the existing
mobile home footprint, adjacent to the construction envelope and
between the construction and the shoreline.
Native vegetation will be planted in two areas near the residence to
mitigate disturbance to existing plants in the buffer zone. The
drainfield area, which is outside the shoreline zone will also be
revegetated with grasses upon completion.
No nutrients, pesticides, herbicides or other contaminants will be
used within 100 feet of the shoreline.
Approval of this Plan will be contingent on commitment by the property owners to
these standards.
WW1637RobinsonRdHMP RPT/042020/mas 25
4.5 DETAILED MITIGATION MEASURES
The detailed Mitigation Measures corresponding to the Plan Components listed
above are as follows:
Timing of exterior construction (grading and foundation), as feasible,
should be limited to the dry season between May 1 and October 30.
Limiting construction to this time period, less effort will limit erosion
and silt runoff.
All graded or excavated areas should be covered or re -vegetated
prior to November 1. if it is necessary to continue construction into
the "wet season," then extra measures will be required for erosion
and silt runoff control. This should be checked by a licensed
engineer.
All erosion control measures should be installed prior to beginning
grading or other ground -disturbing construction activities. A silt fence
will be placed between the mobile home replacement area and the
beach (to the south). This should be kept in place until plantings
(shrubs, trees and grasses) have become established. Straw bales,
jute netting or other material should be kept on -Site and used to
stabilize open areas following grading.
Three areas within the buffer zone (A, B-1 and B-2) will be re -
vegetated with native plant species per the Planting Plan described in
Chapter 4.0 in order to reduce future erosion and enhance buffer
function. Additional re -planting of grasses should occur over the new
septic tank and pump system following construction as specified in
Chapter 5.0. The drainfield area, although outside of the shoreline
zone, could have erosion impacts on the shoreline buffer zone and
should be replanted with grasses to reduce erosion.
Planting success will be monitored and will conform to performance
standards as described in Sections 4.6 and 4.7. If performance
standards are not met, additional plantings or other remedial actions
will be taken to meet standards as per requirements in Section 4.7.
Implementation of these Mitigation Measures is anticipated to
mitigate impacts associated with the development of the Site and
disturbance to the buffer zone. However, the limited filtering capacity
of sandy soils will limit the extent to which the Site will filter long-term
pollution and sediments entering the adjacent waters of Hood Canal.
To minimize the potential for contaminants to enter these waters, no
additional nutrients, pesticides or additional contaminants should be
used on the Site within 100 feet of the OHWM.
VVW1637RobinsonRdH1VlP.RPT10420201mas 26
4.6 IMPLEMENTATION AND TIMING
The continuation of exterior construction on the Site should be conducted between
May 1 and October 30 as feasible, in order to minimize ground -disturbing activities
during the rainy season. Any work carried out during the rainy season should have
all erosion control measures in place prior to beginning.
New plantings in the buffer zone should be carried out during early fall if possible
(September -October) or during early spring (March- April), to avoid the necessity of
supplemental watering. Plantings can be placed during the winter or early spring
(March -May) if necessary, but fall planting is preferred.
If plantings occur during summer months, supplemental watering with a drip
irrigation system or equivalent method may be necessary. Westech recommends
that monitoring of plantings be conducted by a qualified botanist, landscaping firm,
certified arborist, or registered nursery personnel. Success of plantings should be
maintained above a performance standard of 100 percent the first year and 90
percent thereafter (see Section 4.7).
4.7 MITIGATION MONITORING
Buffer areas serve a variety of functions. They are important in that they reduce the
adverse impacts of adjacent land uses by stabilizing soil and preventing erosion;
filter suspended solids, nutrients and toxic substances; moderate impacts of
stormwater runoff; and reduce noise disturbance and light intrusion. They can also
provide important habitat for wildlife.
The limited filtering capacity of well drained sandy soils limit the extent to which the
Mitigation Measures will filter pollution and sediments from ongoing activity. This
can include pollutants from hydrocarbons, heavy metals, pesticides and fertilizer.
Literature on buffer size indicate that buffers of 100 feet may be necessary to
consistently filter sediments and pollution that occur in stormwater runoff (Wenger
1999, Mayer et al. 2005).
Precluding the use of pesticides, nutrients and other potential contaminants within
100 feet of the OHMW will limit the impact of these pollutants on nearshore critical
habitat. The literature also indicates that plantings can increase the effectiveness of
the buffer zone, or decrease the size needed to filter contaminants.
Because buffer zones serve several functions, it is important that the Mitigation
Measures that are implemented to offset significant impacts are successful.
Monitoring over an extended period of time provides the best assurance of
success. Monitoring success of erosion control measures during construction will
be carried out daily during construction.
WVVI637RobinsonRdHMP.RPT/042020/mas 27
Any evidence of erosion or sedimentation leaving the construction area (particularly
during or after storm events) will result in immediate action to block erosion and
sediments. Such siltation can be blocked through the use of additional silt fences,
straw bales, wattles, or temporary berms.
Monitoring the success of new native plants (as per the Planting Plan described in
Chapter 5.0) should be carried out and enforced by the County according to the
following schedule and performance standards:
Following construction, the areas shown in the Planting Plan (Chapter
5,0) should be replanted.
The coverage of replanted native vegetation should remain at 90
percent of the original area planted. If monitoring indicates that viable
vegetation drops below this level in the planting areas, contingency
measures must be implemented. All monitoring should be based on
an "As -Built" Map and Report, which will be prepared to show the
plant locations and documented by on -site photographs of the
planted areas.
The homeowners should have a monitoring report prepared by a
qualified professional following planting (As -built Documentation) and
updated as a Year 1 Monitoring Plan at the end of the first growing
season. Follow-up monitoring reports should be completed at the end
of the second through fifth full years after construction and
restoration. These reports should address the success of the
plantings, note any significant increase in invasive species and
monitor erosion as necessary.
Any plant mortality should be noted and corrected if plant survival
falls below 90 percent during the first three years. Documentation
should include any necessary corrective measures that include
supplemental planting to compensate for plant mortality and notation
of the apparent reasons for such mortality.
All reports should be submitted to Jefferson County for review and concurrence.
For this Plan to be successful, the County must monitor compliance with its
conditions. The failure of the County to monitor the implementation of the Plan may
lead to its ineffectiveness.
VVW1637RobinsonRdHMP. RPT/042020/mas 28
4.8 CONTINGENCY PLAN
A Contingency Plan should be followed if Mitigation Measures appear to be failing
or Performance Standards are not met. This Plan should address, in particular, any
mortality of revegetated areas below the 90 percent survival level at the end of
each year. Should this level be exceeded, the Contingency Plan should include an
assessment of the reasons for failure by a qualified botanical professional and the
development of a plan for introducing plants likely to be successful in the location
where Performance Standards were not met.
WW1637RobinsonRdHMP.RPT/042020/mas 29
5.0 ON -SITE AND BUFFER PLANTING PLAN
5.1 ON -SITE CONDITIONS
The Property lies adjacent to the shoreline of Hood Canal; however, this shoreline
is at a distance of roughly 50 feet from the existing residence. The new septic tank
and pump system will be placed at a distance of roughly 90-100 feet from the
OHWM. The standard buffer in this area can be reduced with approval by the
County and approval of a Habitat Management Plan. In this case, the existing
mobile home will be replaced within the existing residence footprint and the new
septic tank will be placed at roughly the same distance from the shoreline as the
existing septic tank. The 150 foot buffer zone occupies the southern portion of the
Property.
Typical plants found on the Site are listed in Table 2. Many of the existing species
are present on the area north of the existing residence. There are no wetlands or
streams on the property. However, there is a non -fish bearing stream shown
roughly 120 feet west of the property and the Duckabush estuary wetlands are
located about 150 feet west of the property.
5.2 BUFFER PLANTING AND RESTORATION PLAN
A Planting Plan as diagrammed in Figure 7 will be implemented to mitigate for the
disturbance of native vegetation in the buffer areas. Plantings have been proposed
to offset potential impacts based on the existing Site Plan for the new septic tank,
pump system and impacts from placement of the new residence (as shown in
Figure 5).
A list of native plants that will be used for mitigation and restoration can be found in
Table 3. Revegetation and planting of additional vegetation will occur as an integral
part of the Project to compensate for environmental impacts caused by the ground -
disturbing activity, potential erosion and any potential shoreline disturbance from
the Project.
The areas designated for additional buffer zone plantings (to offset the new septic
system and residence replacement project) include (see Figure 7):
Planting Area A is a 20 foot by 80 foot slightly irregular rectangular
area between the home and OHWM). The area is presently covered
by a grassy lawn area. This area should be planted with the mix of
shrubs, and ground cover found in Table 3. Plants may be clustered
to provide a better slightly random mix of species within this area.
WVv1637RobinsonRdHMP. RPT/042020/mas 30
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TABLE 2. EXISTING NATIVE PLANT SPECIES AT THE SITE
(240 Robinson Road, Brinnon, WA)
WW1637-Robinson RdHMP.Tab2/042020/mas 31
TABLE 3. LIST OF NATIVE PLANTS FOR
BUFFER MITIGATION AND ENHANCEMENT
(240 Robinson Road, Brinnon, WA)*
Location
_ Species
Scientific Name -
Number
-_ ........ .Size
A*
Red flowering currant
Ribes sanguineum
12
2 gallon`
A
Coastal strawber
Fra aria chiloensis
25
_
1-gallon
A
Silverweed
Potentilla anserina
12
1- allon
A
Seashore lu in
Lu inus littoralis
12
1- p on
�.. A
Seabeach sandwort
Honckenya Peploides
10
1_ allon
A
Beach ea
Lathrrus maritima
10
1- allon
B-1 "
Mixed Grasses
Gramineae _ ~
2-3
-Pounds
se #ic area]
7.
B-2*
B-2
Shore ine
Pinus contorta _
4
5 allon
—
Tall Ore on Gra a
Mahonia a uifolium
15
B-2
B-2
Snowberr
S m horicar os albus
15
__Lqallon
213 gallon
—Oceanspray
Holodiscus discolor
10
3 all -on
B-2
Kinnikinnick
Arctosta h las uva-ursi
15
1 allon
B-2
Sword fern
Pot stichum munitum
8
1 allon
B-2
_ Salal
Gaultheria shallon ---
12
1 gallon
Area A includes salt and wind tolerant plants. Area B-1 is to be replanted with a
grass seed mixture following construction of the septic system. Area B-2 includes
species found on -site and in the vicinity of the Site.
VWV1637-RobinsonRdHMP.Tab3/052820/mas 33
Planting Area B is an approximately 50 foot diameter circular area
that will be planted near the new septic tank (Area B-2) and an area
where the septic line and pump system will be placed. This area is
also presently vegetated by grasses and should be re -planted using
grasses in Area B-1 and the specified shrub species (for Area B-2) as
listed in Table 3.
Near the new septic tanks, only grasses should be planted (Area B-1). Native
species are preferred by Jefferson County and should be specified for this area to
prevent impacts that shrubs or small trees could have to eventually compromising
the septic system. The area should be maintained in grasses to eliminate such
potential impacts. This also applies to lines running to the drainfield from the septic
tanks within the 150 foot buffer zone and in the drainfield area, which is located
outside of the buffer zone.
Success of the Planting Plan depends on choosing species that are suitable
to the on -Site soil conditions, but that are hardy and capable of handling
nutrient poor soils, shading and some salt spray. The native vegetation
selected for this Mitigation and Habitat Management Plan were chosen for
these reasons.
Soils on the Site are mostly sandy and gravelly loams which are well
drained. Normal rainfall will quickly drain through these soils. Plants may
require additional watering during the first year or two in order to meet
performance criteria. A simple drip irrigation system would be the most
effective method of accomplishing this.
The species, size and number of plants that will be used to revegetate these areas
is shown in Table 3. Plants will be placed in a semi -random fashion within the areas
indicated in Figure 7. Small trees will be placed on eight -foot centers (shore pine
and oceanspray) and shrubs will be planted on six-foot centers or less. Staggering
of plants, rather than planting in straight rows, will create a more natural appearing
configuration. Plants may be clustered by species in order to promote natural
reseeding.
Plants installed in the fall usually out -perform those installed in the late winter or
spring. Planting projects scheduled for early October to mid -December are
generally the most successful. The earlier plants go into the ground in the fall, the
more time they have to recover from transplant shock, adapt to the site, and
expand their roots systems before the growing season. They will require less water
and grow more vigorously than if they are planted in the spring. To increase the
potential for the planted species to survive, four inches of mulch should be placed
around the installed plants with the mulch two inches away from the stem of the
plants.
vWV1637RobinsonRdHMP.RPT/042020/mas 34
6.0 CONCLUSIONS AND RECOMMENDATIONS
6.1 CONCLUSIONS
The Property presently has an existing single wide mobile home, and a small shed
within the 150 foot shoreline buffer zone. An existing septic system is also within
the 150 foot shoreline buffer zone. The landowner intends to construct a new
septic system on the property with a new septic tank and pump system with the
buffer zone and the drainfield outside of the buffer zone as per Figure 5. A new
mobile home will be placed within the footprint of the existing residence as
approved by Jefferson County (see Figure 5).
Measures outlined in this Report will be enacted to mitigate construction on the Site
and incrementally improve habitat and vegetation in the nearshore area. Erosion
control measures will include project timing (dry season construction), a silt fence,
straw wattles and other standard measures. These will be used during construction
to minimize sheet and rill erosion.
A Planting Plan (Chapter 5.0) (See Figure 7 and Table 3) will be implemented to
provide additional vegetation adjacent to the shoreline, and in the construction zone
of the new septic tank and pump system. Also, any invasive, non-native plants
which are present should be removed from the buffer zone.
This Report and associated Habitat Management Plan meets the intent of
RCW36.70A.480 ensuring "No Net Ecological Loss of Shoreline Ecological
Function" due to the Mitigation proposed, and applicable Jefferson County Codes.
It is also intended to comply with federal and state requirements as applicable.
6.2 RECOMMENDATIONS
This Report constitutes a Mitigation and Habitat Management Plan. A Planting Plan
has been included in this Report and we recommend that it be implemented on the
Site upon approval by the County. Benefits deriving from this Plan will only take
Place if it is implemented by the Property owners and enforced by the County.
The silt fence and appropriately placed straw wattles should be emplaced
immediately south of the house site which will include the septic tank construction
area. These erosion control features should be in place prior to commencement of
construction and should be left in place throughout construction. Additional erosion
control materials should be kept on Site to address any erosion observed during
construction.
WW1637RobinsonRdHM P. RPT/042020/mas 35
The Planting Plan outlined in this Report should be implemented. The Plan should
be monitored according to the instructions outlined in this report and the
Contingency Plan implemented in the event that plant survival in the revegetated
areas falls below 90 percent during the five-year monitoring period.
Property owners should refrain from the use of pesticides, herbicides or additional
nutrients on the Site and should introduce no contaminants within 100 feet of the
OHWM. While these measures will provide mitigation for additional construction
and use of the Site, the shoreline and marine critical areas may experience some
continued minor but cumulative impacts as a result of the size of the reduced
buffers and limited filtering capacity of the soils in this area.
WW1 637Robinson RdHMP.RPTl042020lmas 36
7.0 REFERENCES
Creative Design Solutions (CDS). 2020. Site map and septic design for 240
Robinson Road (Parcel 502-15-1018, Jefferson County, Washington. Port
Angeles, Washington.
Google Earth. 2020. Online mapping software. www. to ileearth.com.
Imagery date July 30, 2018. Europa Technologies,
Hitchcock, C.L. and A. Cronquist. 2014. Flora o€the Pacific Northwest. University
of Washington Press. Seattle, Mshington.
Jefferson County. 2020a. Online mapping database. Port Townsend, Washington.
Jefferson County 2020b. Jefferson County Critical Areas Code (JCC 18.22). Port
Townsend, Washington.
Jefferson County. 2020c. Jefferson County Shorelines Management Program.
JCC 18.25, Port Townsend, Washington.
Jefferson County. 2020d. Letter from Donna Frostholm, Jefferson County DCD, to
Charles and Theresa Crowell, Dated March 18, 2020. Jefferson County
DCD, Port Townsend, Washington.
Lyons, C.P. 1997. Wildflowers of Washin t)n. Lone Pine Publishing_ Renton,
Washington.
Mayer, P.M., S.K. Reynolds, and T.J. Canfield. 2005, Riparian suffer Width Ve etative Cover, and Nitro en Removal Effectiveness: A Review of Curre
Science and Regulations. Cincinnati, Ohio. U.S. Environm
gency. ental Protection
A
National Marine Fisheries Service (NMFS). 2020. NMFS Website.
www.nmfs,noaa. ov.
National Oceanic and Atmospheric Administration (NOAA). 2020. Fisheries West
Coast Re ion Website. http://westcoast.fisheries.noaa,gov.
Natural Resource Conservation Service (NRCS). 2020. Web Soil Survey,
http://websoilsurvey.nrcs.usda-gov/app/HomePage.htm
Pojar, J. and A. MacKinnon, 2014. Plants of the Pacific Northwest Coast. Lone
Pine Publishing Company, Redmond, Washington,
VWV1637RobinsonRdHM P. RPT/042020/mas
37
Revised Code of Washington. 2020. RCW36.70A.480. Shoreline of the State.
hftp://apps/leg,wa.gov/rcw/default,aspix?cite=3670A.480.
Taylor, R. 1995. Northwest Weeds. Mountain Press Publishing Company.
Missoula Montana.
U.S. Fish and Wildlife Service (USFWS). 2020. Website: www.fw-S—gOv.
Washington Department of Fish and Wildlife (WDFW). 2020. Priority Habitats and
Species (PHS) List. htt s:llwdfw.wa. ovlcanservationl hs/list.
Wenger, S. 1999, A Review of the Scientific Literature on Ri arian Suffer Width
Extent and Ve etation. Athens, Georgia, Institute of Ecology, University of
Georgia_
Westech Company. 2020b. Wetland Delineation for property at 240 Robinson
Road, Parcel 502-15-1018, Jefferson County, Washington (to be submitted
under separate cover).
WW1637RobinsonRdHMP.RPT/042020/mas 38
APPENDICES
WW1637RobinsonRdHMP. RPT/042020/mas
39
APPENDIX A
SITE PHOTOGRAPHS
WW1637-RobinsonRdHMP.APPA/042020/mas A-1
1) Existing single wide mobile home, seawall and beach at low tide.
2) North side of existing residence accessed by driveway off of Roobinson
Road.
VWV1637-RobinsonRdHMP.APPA/042020/mas
A-2
VOWt-
i4