Loading...
HomeMy WebLinkAbout09D- Habitat Management PlanWESTECH 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 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 PZ'11j-� • -� i 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 CHAPTERISECTION 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 4.2 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 W W 1637-Robinso n Rd H M P. TOC/042020/mas CHA.PTERISECTION PACE 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-Robi nson Rd H M P JOC/042020/mas U161 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 lot 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. VVVV1637RobinsonRdHMP. RPT/042020/mas CD 0 N N O O N N A C � CU � Q O o U U 0 O U O N U L O m Q f4 .L N Q LO CD N \I LL 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). VWV 1637 Robinson Rd H M P. RPT/042020/mas CA 9k 'NA all AK j, -1.- 11 n ld 2.0 APPROACH AND METHODS 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. W W 1637 Robinson Rd H M P. R PT/042020/mas 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" VVVV1637 Robinson Rd H M P. RPl'/042020/mas 10 \ § Cl)/ } \ d / z j )� U. Uy o - m $ LL w z < � z ° E m § z u § ^ / E ° m w m � 2\/ o g 2 2 2 2 2 ; » © ± G a a a)\ ® � » $ \ 2 / \ { \ 2 « } } \ \ / 6 e \ ƒ q a 7 g a r, Q f ; « \ 0-Q. \ O\// (ƒ/ \ , c o o± o o% \ / 3 / / / { / / 7 \ / a) 7 f\ )/ _ = § 5 _ \ j\UE 0)cr } \ ®� m — 7 G § 7 \ * u ® G` > o B E\ Q> = & 2 _ 3 \ / \ / — u a)c o $ — / a * \ \) '® © § } o o f ) % © u 3 u 3 - ® 2 \co f co 2 [ Z3 2 / a 0 7 \ g \ s \ \ ƒ < } § $ } 0 E ) § J k 0 2 0 a. ......--�--.... )� #� W "D «2\ 000 §boc / %%§ )\\) jjj =d %3III k §� cu o\\ 0 % /oe /aa= CT, tm k (\\ 2\\j ®2j %335 2 \� m CL /-- � -- E ] 2 m E § ; z g e k SO CO CO jo\ )«\2/ (D 9222 \G`u {\ ±Qie \ 20Q oQ0 ( cuo« z / a3e c \ E \U)� OL \ \m ]}\ \\± @/\ §)00 o2z (D Z \ 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 (Oncorhynchus 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). W W 1637Robi n son Rd H M P. R PT/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. 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). VVW 1637 Ro binson Rd H M P. R PT/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 Spotted 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). WW1637RobinsonRdHMP.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. VVW 1637 Ro binso n 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 (Eubalaena 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. WW1637RobinsonRdHMP.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 Requirements 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. WW1637RobinsonRd11MP.RPT/042020/etas 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 no 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. W W 1637 Robinso n Rd H M P. 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 on an existing house footprint, an HMP is required 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 shrubs and trees, various grasses and some non-native landscaping (Table 1). WW1637RobinsonRdHMP.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, 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. Lystair fine sandy loam 0-15 percent slopes (LVC). 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 very gravelly loamy sand 15 - 30 percent slopes (GoD). 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. VAN1 637RobinsonRd H M P. RPT/042020/mas 22 a o N N O C) N N U Q [Y E Z m O U n�srss.tri � F 1 ni.e.ci Sri � � u: U � d) O o s7 43 i - ffi sra .z n x m 4 e 2 v s- M �{ Y 1�91 Q Q C Z-iiiiic zu M.VPM.M i z m ti CL co CO Co v ii 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 home) 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. VWV1637RobinsonRdHMP. 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. WVV1 637RobinsonRd H M P. R PT/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. WW 1637 Robinson Rd H M P. R PT/042020/mas 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. VWV1637 Ro bi nson Rd H M P. R PT/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. WW1 637Robi n son Rd H M P. R PT/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. VVVV1637 Robinson Rd H M P. RPT/042020/mas 29 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. WW1637RobinsonRdHMP.RPT/042020/mas 30 TABLE 2. EXISTING NATIVE PLANT SPECIES AT THE SITE (240 Robinson Road, Brinnon, WA) _-__-- ---._.-.--- Common Name Scientific Name Red alder Alnus rubra Western red cedar Thuja plicata Douglas fir Pseudotsuga menziesii Sitka spruce Picea sitchensis Pacific madrone Arbutus menziesii Trailing blackberry _. - - - Salal Sword fern Salmon berry Rubus ursinus - - --- - - - Gaultheria shallon Polystichum munitum Rubus spectabilis Kentucky Blue Grass Perennial ryegra_ss Poa annua Lolium perenne Plantain Plantago maritima W W 1637-Robi nson Rd H M P.Tab2/042020/mas 31 r • •' • or `0 O ry !_ O (D C .O O Q N 0 U) L a cu IL Q1 LL N N TABLE 3. LIST OF NATIVE PLANTS FOR BUFFER MITIGATION AND ENHANCEMENT (240 Robinson Road, Brinnon, WA)* * 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. WW1 637-RobinsonRd H M P. 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 fail 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. VVVV1 637RobinsonRdHM P. 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. WVV1637 Robinson Rd H M P. R PT/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. WW1637RobinsonRdHMP.RPT/042020/mas 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.googleearth.com. Imagery date July 30, 2018. Europa Technologies. Hitchcock, C.L. and A. Cronquist. 2014. Flora of the Pacific Northwest. University of Washington Press. Seattle, Washington. 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 Washington. Lone Pine Publishing. Renton, Washington. Mayer, P.M., S.K. Reynolds, and T.J. Canfield. 2005. Riparian Buffer Width Vegetative over, and Nitrogen Removal Effectiveness: A Review of Current Science and Regulations. Cincinnati, Ohio. U.S. Environmental Protection Agency. National Marine Fisheries Service (NMFS). 2020. NMFS Website. www.nmfs.noaa.gov. National Oceanic and Atmospheric Administration (NOAA). 2020. Fisheries West Coast Region Website. http://westcoast.fisheries.noaa.gov. Natural Resource Conservation Service (NRCS). 2020. Web Soil Survey. http://websoilsurvey.nres,usda.gov/app/HomePage.htm Pojar, J. and A. MacKinnon. 2014. Plants of the Pacific Northwest Coast. Lone Pine Publishing Company. Redmond, Washington. WW 1637Robi n son Rd H M 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: vwvw.fws.gov. Washington Department of Fish and Wildlife (WDFW). 2020. Priority Habitats and Species (PHS) List. https://wdfw.wa.gov/conservation/phs/list. Wenger, S. 1999. A Review of the Scientific Literature on Riparian Buffer Width Extent and Vegetation. 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). WW1 637RobinsonRd H M P. R PT/042020/mas 38 APPENDICES WVV1637RobinsonRdHMP. RPT/042020/mas 39 APPENDIX A SITE PHOTOGRAPHS W W 1637-Robinson Rd H M P.AP PA/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 Robinson Road. WW1 637-Robinson RdHMP.APPA/042020/mas A-2