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Home My WebLink AboutHMP MEP2016-00002 - HMP Habitat Managment Plan - 2/3/2016 4�L M F-P 2 611a - 0000 2- AV The Wetland Corps Wetland Delineation - Habitat Management Plans - Riparian Restoration • Mitigation • Biological Evaluation RECEIVED WETLAND BUFFER MITIGATION PLAN FEB 0 3 2016 230 E North Bay Road,Belfair MASON CO. PLANNING DEPT. Mason County Tax Parcel: 12220-50-19002 Prepared for: Kenny Chan Che Et Ux 745 N 199TH STREET Shoreline, WA 98133 Prepared by: Lee Boad and Heather Lane January 2016 PO Box 2854 Belfair,Washington 98528•Cell Phone 360-620-0618.Office Phone 360-372-2421•wetlandcorps@hotmail.com Wetland Buffer Mitigation Plan Table of Contents INTRODUCTION................................................................................................................... 1 PROJECTDESCRIPTION................................................................................................... 1 APPLICABLE SETBACKS ..................................................................................................3 ANALYSIS OF EFFECTS.....................................................................................................3 MITIGATION.........................................................................................................................3 MONITORING....................................................................................................................... 7 SUMMARY............................................................................................................................. 7 REFERENCES........................................................................................................................8 Figures Figure 1. Site Vicinity Map Figure 2. Site Map Figure 3. National Wetland Inventory Map Figure 4. Mason County Soil Survey Map Figure 5. DNR Water Resource Map PO Box 2854 Belfair,Washington 98528•Cell Phone 360-620-0618.Office Phone 360-372-2421•wetlandcorps@hotmail.com The Wetland Corps - Wetland Delineation - Habitat Management Plans • Riparian Restoration • Mitigation - Biological Evaluation WETLAND BUFFER MITIGATION PLAN 230 E North Bay Road,Belfair Mason County Tax Parcel: 12220-50-19002 PROJECT DESCRIPTION The details of a Wetland Buffer Mitigation Plan for the above referenced site (Parcel 12220-50- 19002) are discussed in full in this report. The property is found in Section 20, Township 22 North, Range 01 West WM on the western shore of North Bay. (Figure 1 Vicinity Map). The purpose of this Wetland Buffer Mitigation Plan (WBMP) is to address potential impacts resulting from the proposed construction of a single family residence within the buffer of a Category I Estuarine Wetland. The house is proposed 20 feet from the wetland at the nearest point. The proposed building location is within a gravel area currently occupied by an RV. Utilizing the proposed building location will require no native vegetation displacement and minimal construction oriented earthwork. The objectives of this WBMP are as follows: ■ To evaluate the potential adverse effects to critical area functions resulting from the proposed construction within the wetland buffer and building setback. ■ To outline mitigation measures necessary to offset potential adverse effects resulting from proposed work. SITE DESCRIPTION The parcel consists of relatively flat landscape with an elevated portion on the western side. The portion of the wetland within the property is part of large system associated with the North Bay, occupying an area over 50 acres and supporting several hydrogeomorphic classes (estuarine tidal-fringe, slope,riverine and depressional) within the boundary. The estuarine tidal-fringe portion of the wetland is located north and east of the ownership. This portion of the wetland system is classified as a salt water tidal-fringe wetland because the PO Box 2854 Belfair,Washington 98528-Cell Phone 360-620-0618.Office Phone 360-372-2421-wetlandcorps@hotmail.com Wetland Buffer Mitigation Plan TWC 16-4 Page 2 of 8 water levels in this portion of the wetland are usually controlled by tides and the salinity of the water during periods of annual low flow are above 0.5 ppt(parts per thousand). The freshwater forested/shrub portion of the system occupies the majority of the subject property. The portion of the wetland within the subject property meets Department of Ecology criteria for a slope freshwater forested/shrub wetland because of the presence of a slope gradient (1 to 2%), and water leaves the wetland without being impounded. The freshwater forest/shrub portion of the wetland continues north and south off of the property. The approximate extent of the wetland is depicted on the NWI map shown in Figure 3. Project Area Photo 1. Project area as shown on Mason County GIS APPLICABLE SETBACKS The project site is within the jurisdiction of Mason County. Ordinance 17.01.070 identifies Wetland Areas adopted by Mason County. The on-sight wetlands are classified as Category 1 Estuarine Wetlands. This proposed project meets chapter 17.01.070 criteria for high impact development. Therefore, the applicable setback for this project is as follows: PO Box 2854 Belfair,Washington 98528•Cell Phone 360-620-0618.Office Phone 360-372-2421•wetlandcorps@hotmail.com Wetland Buffer Mitigation Plan T WC 16-4 Page 3 of 8 Habitat Type Buffer Building Setback from Buffer Category I Estuarine Wetland 250' 15' ANALYSIS OF EFFECTS The SFR is to be located within the regulated buffer associated with a Category I Estuarine Wetland. Project scale in the protected area is as follows: Development Type Habitat Type Project scale within buffer SFR Category I Wetland buffer 1,512 sq. ft. Vegetation Disturbance The proposed building footprint is located in a portion of the ownership that has been maintained as a gravel RV parking area containing no native vegetation. No overstory tree removal is necessary for this project. With recommended planting of native vegetation described below, the project will result in an overall net benefit of native vegetation abundance and diversity within the site. Designated Critical Habitat for Salmonids North Bay is listed as a Final Designation on the NOAA Fisheries Northwest Region Critical Habitat Designations for West Coast Salmon and Steelhead- August 2005. None of the proposed actions are likely to destroy or adversely modify designated critical habitat. Actions described in this plan are not of a nature or scale that would jeopardize the continued existence of any listed species. Noise Pollution A slight increase in noise from construction activities is likely to occur during daylight construction hours. No nesting sites for listed species have been identified within the radii of concern associated with the project area. Given the existing housing and residential use of the nearby area, any resident wildlife species have likely become locally adapted to noise associated with intermittent construction activity, residential traffic, and residential use. Temporary Increase in Sediment and Turbidity During Construction The proposed work has the potential to temporarily increase turbidity and suspended sediment within the project area. Best Management Practices have been recommended to minimize the adverse effects associated with sediment and turbidity during site preparation and construction. Light and Glare Given the nature of the project, the most significant outdoor lighting will be directed away from the wetland towards the driveway access. Any outdoor lighting located on the wetland side of the buildings should be low level lighting and the minimum necessary. There should be no added light to the wetland areas associated with this project. This should insure no impacts to the use of the site by wildlife species will result from light and glare associated with this project. PO Box 2854 Belfair,Washington 98528•Cell Phone 360-620-0618.Office Phone 360-372-2421•wetlandcorps@hotmail.com Wetland Buffer Mitigation Plan TWC 16-4 Page 4 of 8 MITIGATION MEASURES Preservation of Critically Important Plants All remaining wetland buffer outside of the project area should be maintained in its existing state or enhanced with native vegetation. Avoidance The primary avoidance measure associated with this project is the limited size of the building and locating it the furthest distance from the wetland that the configuration of the property will allow. Minimization The proposed project minimizes impacts to the wetland buffer by limiting the square footage of the house footprint within the buffer to approximately 1,512 square feet. Best Management Practices Recommended Best Management Practices for this project are as follows: • Perform excavation and site preparation work during dry weather. • Install silt fencing between the work area and the wetland to prevent erosion and siltation of waters(See diagram below). • Minimize amount of erodible soils at any given time to the maximum extent feasible. • Check all equipment daily for leaks. Refueling and lubrication of equipment should occur off site. Do not store any fuel, lubricants, chemicals, or hazardous substances outside overnight within the project area. • Do not apply any chemicals when there is a possibility of rain. • Comply with all permits and requirements of governing authority. PO Box 2854 Belfair,Washington 98528•Cell Phone 360-620-0618.Office Phone 360-372-2421-wetlandcorps@hotmail.com Wetland Buffer Mitigation Plan TWC 16-4 Page 5 of 8 6' HIGH CONSTRUCTION STEEL POST FENCE A r- rw,w 10 Fr wx SPACING WITH WIRE SUPPORT FENCE 6 FT&W SPACING WrTHOuT WIRE SUPPORT FENCE FILTER FABRIC PONDING HT. LL ATTTA�UPS URELY STEEL POST SII OF POST. RUNOFF T 12-MIN. wmiNCH CWPACTED BACKFILL Silt Fence Diagram Silt fence Installation The presence of exposed soil associated with site preparation work poses a risk of erosion and siltation to the wetland during storm events. It is recommended that silt fencing be installed between the work area and the wetland to avoid siltation. The silt fence should be inspected and repaired if necessary after each storm event. Sediment should be removed from the fence and deposited to an area that will not contribute to regulated waters. The fence can be removed once the project is complete and soil has stabilized. Any exposed soil around the project site should be covered with temporary erosion control such as bark mulch, jute netting, or hydro seed. Compensatory Mitigation Chapter 17.01.070 of the Mason County Resource Ordinance requires that wetland buffer displacement be mitigated at a minimum 1:1 ratio. As the total project requires approximately 1,512 square feet or less of buffer to be displaced by the SFR, buffer enhancement is to occur within the upland slope located between the house and wetland. The selected area is currently occupied by a gravelly slope. It will be enhanced by planting native trees and shrubs thus adding a structurally diverse patch of native vegetation adjacent to the wetland. PO Box 2854 Belfair, Washington 98528•Cell Phone 360-620-0618.Office Phone 360-372-2421,wetlandcorps@hotmail.com Wetland Buffer Mitigation Plan T WC 16-4 Page 6 of 8 Native Plantings The following is a list of suggested species to be used for planting. The species have been chosen based on their presence within vegetated upland sites, tolerance to moist conditions, and light requirements. It is recommended that potted plants be used as opposed to bare root seedlings. Trees: Douglas fir(Pseudotsuga menziesii)-2 gallon Shrubs: nootka rose (Rosa nutkana)— 1 gallon salmonberry(Rubus spectabilis)— 1 gallon Pacific Willow(Salix lusida)— 1 gallon hooker willow(Salix hookeriana)— 1 gallon scouler willow(Salix scouleriana)— 1 gallon Sitka willow(Salix sitchensis)— 1 gallon beaked hazelnut(Corylus cornuta)— 1 gallon indian plum(Oemleria cerasiformis)— 1 gallon oceanspray(Holodiscus discolor)— 1 gallon pacific ninebark(Physocarpus capitatus)— 1 gallon red flowering currant(Ribes sanguineum) California black currant (Ribes bracteosum)— 1 gallon western thimbleberry(Rubus parviflorus)— 1 gallon red elderberry (Sambucus racemosa)— 1 gallon Native Planting Guidelines It is recommended that plantings be installed within the identified mitigation zone to achieve the following densities. A minimum of 3 species types from the above list are recommended. The following spacing is recommended: trees- 10' on center shrubs- 5' on center These densities will provide a moderately dense, structurally diverse plant community within the mitigation zone. To fulfill the above mentioned planting density guidelines, the Enhancement Zone will be planted with a minimum of 48 plants. Volunteer vegetation may be counted toward the target density. Typically, planting should occur during winter dormancy. The optimum time for planting is during February and March. No machinery earthwork will be necessary to implement this enhancement plan; planting holes for specified vegetation installation will be hand dug. All installed vegetation should be marked with colored flagging to facilitate monitoring inspections and allow the plants to be easily visible during invasive species control efforts. Invasive species such as Himalayan blackberry and pasture grasses are stubborn competitors for light and nutrients, often hindering the survival of newly installed plants. It is recommended that these be cut back a minimum of three times during the growing season over PO Box 2854 Belfair,Washington 98528•Cell Phone 360-620-0618.Office Phone 360-372-2421•wetlandcorps@hotmail.com Wetland Buffer Mitigation Plan TWC 16-4 Page 7 of 8 the first five years. Herbicides should not be used to eliminate non-desirable plant species due to the proximity to the wetland. Persistent cutting during the growing season recommended above will be sufficient to offset the rhizomes of invasive species. MONITORING Monitoring of the site will be required as a condition of permit approval. This monitoring will begin the first fall following installation of native plants and be maintained on an annual basis. The information gathered will provide the following: 1) condition of installed plant species; 2) the use of the site by wildlife species; 3) any disturbance caused by the construction and its effect on the protected zone and associated aquatic habitat; 4) any occurrence of exotic species within the Enhancement Zone; 5) any corrective measures that may be deemed necessary to provide desired conditions. This monitoring will be in effect for the duration of five years. The information gathered will be provided in an annual report and submitted to the Director of the Mason County Department of Community Development. SUMMARY This report addresses the establishment of a SFR to be located within a tax parcel containing a category I estuarine wetland and associated buffer. The building is proposed in an open area with flat topography. The building has been designed to avoid the wetland and buffer to the extent feasible given the limited size of the property. Best Management Practices have been outlined to insure no negative impacts to water quality resulting from construction. Mitigation recommendations include native plant enhancement of the sloped area between the proposed building and the wetland. No impacts to water quality or aquatic habitat are predicted. Mitigation Measures and Best Management Practices have been identified to avoid, minimize, and mitigate for impacts associated with proposed construction. We trust this information is sufficient for your needs at this time. Thank you for choosing The Wetland Corps as your wetland consultant. If you have any questions feel free to call. Respectfully submitted, Lee Boa Heather Lane Senior Ecologist Staff Wetland&Natural Resource Specialist PO Box 2854 Belfair,Washington 98528-Cell Phone 360-620-0618.Office Phone 360-372-2421-wetlandcorps@hotmail.com Wetland Buffer Mitigation Plan TWC16-4 Page 8 of 8 Applicable Literature Cowardin, L.M., V. Carter, F.C. Golet and E.T. LaRoe, 1979. Classification of Wetlands and Deepwater Habitats of the United States. U.S. Fish and Wildlife Service document FWS/OBS-79/31. 84 pp. Washington, D.C. Hitchcock, L.C. and A. Cronquist, 1973. Flora of the Pacific Northwest. University of Washington Press.. 730 pp. Hruby, T., 2004. Washington State Wetland Rating System for Western Washington—Revised. Washington State Department of Ecology Publication#04-06-025. Munsell Soil Color Charts, 1998. GretagMacbeth. New Windsor,New York. Pojar, J. and A. MacKinnon, 1994. Plants of the Pacific Northwest Coast. Lone PinePublishing. 528 pp. Vancouver, British Columbia. Speare-Cooke, S., 1997. A Field Guide to the Common Wetland Plants of Western Washington and Northwestern Oregon. Seattle Audubon Society. 417 pp. US Department of Agriculture, Soil Conservation Service. Soil Survey of Mason County Area, Washington. September, 1951. US Fish and Wildlife Service. National Wetlands Inventory. 1978. Washington State Department of Ecology, 1997. Washington State Wetland Identification and Delineation Manual. Ecology Publication#96-94, various pagination. Olympia, Washington. Washington State Department of Ecology, 1993. Washington State Wetlands Rating System, Western Washington Second Edition. 61 pp.Ecology Publication#93-74. Olympia, Washington. Washington State Department of Ecology, 1999. Methods for Assessing Wetland Functions for Reverine and Depressional Wetlands in the Lowlands of Western Washington. Ecology Publication#99-115. Olympia, Washington. United States Fish and Wildlife Service, 1993.National List of Plant Species that Occur in Wetlands Region 9—Northwest. Resource Management Group PO Box 2854 Belfair,Washington 98528-Cell Phone 360-620-0618.Office Phone 360-372-2421•wetlandcorps@hotmail.com rye, t sr �4ft Park 1 - { o E Alta Dr ,' ' JAi �a t } s_ "Pod r y Cmrwt st Lakeland Village L Golf Course - 4� ' ERaW t Z 0 / Approximate Site Location ^z� n ' 2 I w I a••V sO Y r t" +� F° of N d'� R�ecfE-ap c t i Day L m FIGURE 1. SITE MAP MASON COUNTY PARCEL: 12220-50-19002 WETLAND BUFFER MITIGATION PLAN � - I Project Number: TWC16-W04 Location: Belfair,WA THE WETLAND CORPS Date: 1/2016 Client: Kenny Chan Che et ux This site map was created by TWC by coordinating measurements and information from several sources, including the Mason r 'WWW County Assessor Aerial Photo 2009 and Well GoogleEarth aerial images and measurements. . All locations are approximate. 4`' Edge of Fill Proposed 1,512 sq ft SFR f Vegetation Enhancement Zone ,k �v - Category I Wetland FIGURE 2. SITE MAP MASON COUNTY PARCEL: 12220-50-19002 WETLAND BUFFER MITIGATION PLAN Project Number: TWC16-W04 THE T E j��ETLk�i D CORPS' Location: Belfair,WA 1 ..�. 1r lr 1 V Date: 1/2016 Client: Kenny Chan Che et ux National Wetlands Invento .,. w - -- Availabie Layersli :zkk .I — sex ,r In\t Approximate Site Location - — ,.� I3JIh Sues KV n N xd, A L w 1401h 4tiaef Ki li Its - t" Victor t\n 0 I Figure adapted from the Figure 3. NWI Map NWI Mapping Website Section 20 Township 22 North Range 1 West FIGURE 3. NWI WETLANDS MAP MASON COUNTY PARCEL: 12220-50-19002 WETLAND BUFFER MITIGATION PLAN Project Number: TWC16-W04 THE WETLAND CORPS Location: Belfair,WA Date: 1/2016 Client: Kenny Chan Che et ux Ab Ee Ac r Mc Mason County Soil Survey Ab—Alderwood gravelly sandy loam, 8 to 15 percent slopes Ac—Alderwood gravelly sandy loam, 15 to 30 percent slopes Ee—Everett gravelly loamy sand, 5 to 15 percent slopes Mc—McKenna gravelly loam, 0 to 3 percent slopes FIGURE 4. MASON COUNTY SOIL SURVEY MASON COUNTY PARCEL: 12220-50-19002 WETLAND BUFFER MITIGATION PLAN Project Number: TWC16-W04 --iw Location: Belfair,WA Date: 1/2016 THE WETLAND CORPS Client: Kenny Chan Che et ux I• F� I F :SCF_ I I IT AI f J I I I C 17 L' i 7 J 1 J I S Pugot Sound i� jJ S PuWt I70- t Water Bodies Water Bodies Approximate Site . Flats/Gravel Bars ■ Ice Location ■ Man Made Features Open Water ■ Wet Area Streams Streams — Type S — Type F — Type N,Np,his U,unknown X,non-typed per WAC 222-16 FIGURE 5. WA DNR WATER RESOURCE MAP MASON COUNTY PARCEL: 12220-50-19002 WETLAND BUFFER MITIGATION PLAN Project Number: TWC16-W04 Location: Belfair, WA THE WETLAND CORPS Date: 1/2016 Client: Kenny Chan Che et ux