Loading...
HomeMy WebLinkAboutATF Bulkhead, Pier, Dock, Cabin Addition - HMP Habitat Managment Plan - 8/31/2022 PLANNING RECEIVED S3 AUG 31 2@22 Habitat Corp. 615 W. Alder Street Habitat Management and Mitigation Plan L t 148 E Tahuya Blacksmith Rd i e •� t It, 6 11� j I• y _ T •f ? t -i a�I 1t PREPARED FOR: Wayne & Robin Johnson 1480 NE Tahuya Blacksmith Road Tahuya, WA 98588 PREPARED BY: C3 Habitat Corp. 1903 154th Street CT NW Gig Harbor, WA 98332 June 14, 2022 C3 Habitat Corp. 1803 154th Street CT NW, Gig Harbor, WA 98332 C(S3 HabHat Cap. TABLE OF CONTENTS 1.0 INTRODUCTION.......................................................................................................... 3 2.0 PROJECT DESCRIPTOIN........................................................................................... 3 SITE VICINITY MAP................................................................................................................4 3.0 CRITICAL AREA REVIEW........................................................................................... 5 3.1 National Wetlands Inventory........................................................................... 5 3.2 LISTED SPECIES AND HABITATS IN THE PROJECT VICINITY.............. 6 Fish ..................................................................................................................................7 Birds.................................................................................................................................7 Plants...............................................................................................................................7 4.0 FIELD REVIEW.............................................................................................................. 8 5.0 POTENTIAL ECOLOGICAL IMPACTS FROM PROPOSED SITE ACTIVITY... 8 Baseline Environmental Conditions....................................................................... 8 6.0 IMPACT AVOIDANCE AND MITIGATION MEASURES....................................... 8 7.0 IMPACTS OF SITE DEVELOPMENT........................................................................ 9 Recommended Conditions.......................................................................................9 8.0 MITIGATION PLAN......................................................................................................9 9.0 SUMMARY.....................................................................................................................9 SITEPHOTOS..........................................................................................................................10 SITEPLAN ................................................................................................................................12 PLAN/ELEVATION VIEW.......................................................................................................13 C3 Habitat Corp. 1803 154th Street CT NW, Gig Harbor, WA 98332 3 Habitat Corp. Habitat Management and Mitigation Plan Parcel number Acreage Owner S/T/R Proposed Use 22330-50-00153 .25 Johnson 30/23N/02W Dock 1.0 INTRODUCTION C3 Habitat (C3) has completed a Habitat Management Plan to address function and ecological impacts to shoreline habitat for the Johnson proposed Dock project. The project is located on Haven Lake in Section 30 of Township 23N in Range 02W of the Willamette Meridian. The project includes construc- tion of a new dock extending southeast from the lake shoreline. Because the project is located with- in a regulated residential shoreline, it requires regulation under the Shoreline Master Program Title 17.50.320. Mitigation is required for any new impervious area that is created and/or vegetation clearing. The goal of this Mitigation Plan is to achieve a no-net loss to the ecological function of the shoreline habitat and resultant landward buffer. 2.0 PROJECT DESCRIPTION The project consists of constructing a new dock. The site is currently developed with a cabin, retaining block bulkhead, retaining walls, and septic system. Near the shoreline is maintained as lawn. Near the cabin includes evergreen trees with no shrub understory. There are no landward wetlands or streams on the property. The new 6' x 36' dock will have 50% flow-through grating and be supported by 6 gal- vanized steel pilings. Depth of water at the end of the dock is approximately 6-feet deep. SITE VICINITY MAP Litlon 1 Harnme Hamma eewatlo Cemetery Elfendahl Eagle Creek© Pass Staging Area(Tahuya ORV Park) 19 Limwd�; 1480 NE Tahuya Blacksmith Rd Tahuya, WA 98588 HAVEN Dewalto LAKE 19 Hahobas Deati� r� 8SA Camp Isport -jnset Beach Lakeland Village Golf Course/Pro Shop® Twanoh Tahuya Slate Park Mason Lake County Park© Union �„� 3.0 CRITICAL AREA REVIEW 3.1 National Wetlands Inventory The U.S. Fish and Wildlife Service, National Wetlands Inventory (NWI) lists Haven Lake as L1UBH — (L) — Lacustrine, (1) — Limnetic, (UB)- Unconsolidated bottom, (H) — permanently flooded. See NWI Map — Figure 1. The site is approximately .05 miles from a type F stream (known to be used by fish) and .09 miles from a type N stream (known to be not used by fish). See Figure 2 DNR Forest Prac- tices Application Mapping Tool) Figure 1. NWI Map i �� y, • ��.�i.•a �_ rye ell Ab n r 'r'� Jr fi n • .t 4ft it R jot MA - . • 'Z ' Figure 2. DNR Forest Practices Application Mapping Tool • IDenaa .. ' ITE � y GOOFF 3.2 LISTED SPECIES AND HABITATS IN THE PROJECT VICINITY The potential presence of listed species, including fish, bird, and mammals that have a primary association with the habitat of Haven Lake was evaluated by a site visit, aerial photographs, the WDFW Priority Habitats and Species website (WDFW 2021, see Figure 2), the U.S. Fish and Wildlife Service (USFWS 2021) IPaC, the Protected Resources App (NOAA 2021), and the Washington De- partment of Natural Resources Natural Heritage website (WDNR 2019, see Table 1). Table 1 Species State Status Federal Status Critical Habititat in Project Vicinity Bull Trout Candidate Threatened No Salvelinus confluentus Dolly Varden Not Listed Proposed Similarity of Ap- No Solvelinus malma pearance (Threatened) Marbled murrelet Threatened Threatened No Brachyromphus mormoratus Streaked Horned lark Endangered Threatened No Eremophilo olpestris strigota Yellow-billed Cuckoo Candidate Threatened No Coccyzus amencanus Monarch Butterfly Candidate Threatened No Donaus plexippus Figure 2. PHS Map � E Fish According to the U.S. Fish and Wildlife Service website, there are two listed species of salmon in Mason County. Bull trout (Salvelinus confluentus) is found within habitat areas having "the four C's;" cold, clean, complex, and connected. Haven Lake does not facilitate the habitat features needed to support bull trout populations. Steelhead is a species of anadromous fish that prefers "fast water in small to large mainstem rivers and medium to large tributaries". Haven Lake does not facilitate the hab- itat features needed to support steelhead populations. Birds Research conducted for this project shows that the lot does not have habitat for marbled murrelet, streaked horned lark, or yellow-billed cuckoo. The forested conditions adjacent to the site are not suitable for the listed bird species listed in this area of Mason County and it does not appear that any known nesting or breeding sites are mapped in the vicinity (WDFW). There are several migra- tory birds on the USFWS Birds of Conservation Concern in the area, however, the project development does not propose to impact the presence and breeding of these birds. Plants The Washington Department of Natural Resources, Natural Heritage Program website (WANHP 2013) lists seven rare plant species that occur within Mason County. None of the listed species are found within developed residential communities where non-native and invasive species dominate so none were identified during the field visit. 4.0 FIELD REVIEW Field and aerial photograph review was performed on the subject parcel as well as adjacent parcels. There are no restrictions to the property other than the designated shoreline of Residential Shoreline zoning. The Haven Lake shoreline setback buffer has already been approved at 115-feet. The western property line is defined by NE Tahuya Blacksmith Road. The property gently slopes downward to the lake which defines the eastern property line. There is a type F stream approximately .05 miles and a type N stream .09 miles southeast of the project site. Field review revealed no special habitat or spe- cies utilizing the landward or waterward portion of the property. The landward portion is densely forest- ed with approximately one-quarter cleared with lawn near the shoreline. 5.0 POTENTIAL ECOLOGICAL IMPACTS FROM PROPOSED SITE ACTIVITY 5.1 Baseline Environmental Conditions Currently, lawn and a retaining block bulkhead dominate the shoreline buffer. The remainder of the upland buffer is lawn with ornamental landscaping. There is no beach. Haven Lake drops in ele- vation gradually from the bulkhead. Approximately 100-feet east of the bulkhead the lake is about 10-feet deep. There is no visible aquatic vegetation immediately found near the shoreline OHWM nor waterward of the OHWM. 6.0 IMPACT AVOIDANCE AND MITIGATION MEASURES According to the Mason County's Shoreline Master Program, the use of mitigation sequencing is re- quired and essential to determining how the proposed project contributes to the no net loss standard. 1. Avoid - Docks are allowed, so avoidance is not practical, and the neighbors on each side are not interested in sharing their docks. As docks are allowed under the Shoreline Master Plan for each tax lot, the property owner has a right to a single use dock, even though joint-use docks are en- couraged. 2. Minimize - The proposed dock is the shortest length possible to achieve the desired purpose. 3. Rectify - To achieve a no net loss of environmental functions, the applicant proposes to use 50% flow-through grating for the dock surface allowing for light penetration. 4. Reduce — Shading will be reduced by providing grating to allow for maximum light penetration. The structure will be supported with galvanized steel pilings instead of treated wood. 5. Compensate - The applicant will remove 100 square feet of invasive Iris at the northeast end of the property. 6. Monitor - No monitoring is proposed for this project. 7.0 IMPACTS OF SITE DEVELOPMENT The impacts to the existing habitat and ecological function of the property from the proposed site activities are negligible. However, allowing for the construction of the proposed dock will have minor impacts to the lake environment. The two main typical ecological impacts from dock development are: 1. Human activity — As this is a replacement for an existing structure, it is not proposed to increase the level of already existing human activity. 2. Water Quality — Keeping any boat well maintained and free of oil and gas leakage is recommended. When boat washing, clean water without soap or chemicals is recommended. Recommended Conditions To minimize adverse effects on habitats and species caused by overwater structures that reduce ambi- ent light levels, overwater structures shall incorporate functional grating. Treated wood or toxic materials used for components that may come in contact with water shall be made of non-toxic materials where feasible. The overwater structure should be located and designed as to not significantly impact or unnecessarily interfere with the rights of adjacent property owners, or adjacent water uses including navigation and boat operation. Artificial lighting on overwater structures shall be the minimum necessary and lighting should be de- signed to minimize glare. The overwater structure shall be constructed and maintained in a safe and sound condition. Aban- doned or unsafe structures shall be removed or repaired promptly by the owner. For freshwater docks, the measured overall length cannot exceed sixty feet from the OHWM. 8.0 MITIGATION PLAN Mitigation is required to compensate for the new overwater coverage. The proposed dock is 204 square feet overwater. To compensate for the new overwater coverage 100 square feet of invasive Iris will be removed at the northeast end of the property (see Site Plan). 9.0 SUMMARY The dock has been designed to reduce impacts as much as possible while still conforming to the county's building standards. The dock will have 50% flow-through grating allowing for light penetration. Invasive yellow iris will be removed at the northeast end of the property. The result will not adversely impact the ecological functions and habitat of the shoreline environment. Best management practices shall be used for all site work. Site Photos "T Ar -- '. 1 �Ilk ir . • • .r t• t` t.. R !~' < �, ' •• r.. �! •�a s'r ' .• Y ir a .r . Ar •+jR �.; Aerial view -g � I-P, _ - t y facing Southeast - 4 - i"W:t � `-1 r , � F i � k, r` ti ���3-•ter '„'" �� ''' _ .�' JO 101 4- ' '` Invasive Iris to be removed it, JIM Ni 14 , �• 5 1 r I"L- • ,': Invasive Iris to be removed