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HomeMy WebLinkAboutHMP for SFR - HMP Habitat Managment Plan - 1/30/2007 THE VVETLAND CORPS Wetland Delineation • Habitat Management Plans • Riparian Restoration • Mitigation • Biological Evaluation BENNET HABITAT MANAGEMENT PLAN Parcel#322245000032 Mason County,Washington Prepared for: Phillip Bennett PO Box 1863 Belfair,WA 98528 Prepared by: Heather Lane and Lee Boad January,2007 PO Box 2854, Belfair,WA 98528 cell:360-620-0618, Office: 360-372-2421 e-mail: boad40Qpeoplepc.com TFH VVETLAND CORPS 5 Wetland Delineation • Habitat Management Plans - Riparian Restoration • Mitigation • Biological Evaluation BENNETT HABITAT MANAGEMENT PLAN TABLE OF CONTENTS 1.0 PROJECT DESCRIPTION...................................................................................................1 2.0 PROPERTY DESCRIPTION...............................................................................................1 3.0 APPLICABLE SETBACKS..................................................................................................2 4.0 DESCRIPTION OF HABITAT AND SPECIES.................................................................2 5.0 ANALYSIS OF EFFECTS....................................................................................................3 6.0 MITIGATION MEASURES.................................................................................................4 7.0 MONITORING ......................................................................................................................7 8.0 SUMMARY.............................................................................................................................7 Figures i Figure 1. Site Vicinity Map Figure 2. Site Plan Figure 3. National Wetland Inventory Map Figure 4. Mason County Soil Survey Map Figure 5. Departrnent of Natural Resources Water Resource Map PO Box 2854, Belfair,WA 98528 cell:360-620-0618, Office: 360-372-2421 e-mail: boad40@peoplepc.com TIU WETLAND CORPS - Wetland Delineation • Habitat Management Plans • Riparian Restoration • Mitigation • Biological Evaluation January,2007 Page 1 BENNETT HABITAT MANAGEMENT PLAN Belfair,Washington 1.0 PROJECT DESCRIPTION The details of a Habitat Management Plan prepared for Phil Bennett for the property off of North Shore Road (Parcel No. 322245000032) are discussed in full in this report. The site is found in the SW '/a of Section 24 Township 22 North,Range 3 West(See Figure 1, Site Vicinity Map). The purpose of this Habitat Management Plan (HMP) is to address potential impacts resulting from the proposed construction of a 2250 square foot single-family residence(SFR)within the regulated buffer of the shoreline of Hood Canal. According to Table 3. of Section 17.01.040 of the Mason County Resource Ordinance, Hood Canal is regulated in Mason County as a saltwater shoreline, requiring an undisturbed buffer of 100 feet. However, Mason County staff has cited that due to the adjacent residences being located very near the ordinary high water mark of Hood Canal, the minimum shoreline setback distance for this property is 35 feet (20 feet of vegetation buffer at the tide line and 15 feet of building setback from the outer edge of vegetation buffer). While this report summarizes impacts to the site resulting from the entire project, only a small portion of the proposed building will be within the regulated buffer area(Figure 2). The entire property is comprised of a high gradient slope (30 to 50 percent) down to the shoreline. A geo-technical report has been prepared which identifies the area between the road and the water as the only site with potential to be suitable for building. Given the topographic constraints of the property,the proposed project will require substantial grading of the portion of the parcel, south of North Shore Road, to a gradient that will allow for the construction of a 2250 square foot SFR. The SFR is proposed 15 feet from the Ordinary High Water Mark of Hood Canal at the nearest point. The septic system for the SFR is located on the north side of North Shore Road, outside of the shoreline buffer. Site specific constraints include the North Shore Road right of way, landslide hazard areas, and limited lot size. The objectives of this HMP are as follows: ■ To evaluate the potential adverse effects to critical area functions as well as fish and wildlife habitat resulting from earthwork throughout the entire regulated buffer of a shoreline (Hood Canal) within the parcel, to allow the establishment of an SFR 15 feet from the OHWM of the shoreline. Emphasis is placed on the possible loss of habitat for any listed species found to be residing in the vicinity of the parcel. ■ To identify possible mitigation measures that could be implemented to offset the adverse effects resulting from grading the shoreline buffer and the establishment of a SFR. PO Box 2854, Belfair,WA 98528 cell:360-620-0618,Office: 360-372-2421 e-mail: boad40@peoplepc.com Bennett HMP January,2007 Page 2 2.0 PROPERTY DESCRIPTION The ownership is recorded by the Mason County Assessor as 0.28 acre in size however our calculations based on the lot dimensions provided by the applicant indicate the lot to be approximately .6 acre. It is roughly rectangular in shape, and is oriented northwest to southeast. Hood Canal occupies the southern portion of the property while residential lots of similar size and shape border the parcel to the east and west. North Shore Road bisects the parcel; development is proposed south of North Shore Road. The right of way associated with the North Shore Road is presumed to be 30-feet from the center line. Vegetation within the parcel is comprised of an overstory of Douglas fir, red alder and big leaf maple with a shrub layer of salal, evergreen huckleberry, and sword fern. Topography within entire the lot slopes at a high gradient southerly, toward the shoreline of Hood Canal. A newly installed partial road grade enters the northern portion of the parcel from North Shore Road, and meanders down toward the shoreline. 3.0 APPLICABLE SETBACKS The project site is within the jurisdiction of Mason County. Ordinance 17.01.110 identifies Fish and Wildlife Habitat Conservation Areas adopted by Mason County. The applicable setback for this project is as follows: Habitat Type Buffer Building Setback from Buffer Type S Water 20' 15' 4.0 DESCRIPTION OF HABITAT AND SPECIES Puget Sound Chinook(Oncorhynchus tshawytsha)-Threatened Listed as threatened since March 24, 1999, adult Puget Sound Chinook spawn in several rivers and streams flowing into Puget Sound. In the vicinity of the project area, summer/fall Chinook spawn in the Tahuya and Skokomish rivers. These stocks are assumed to be of hatchery origin and not managed as a wild stock. This shoreline adjacent to the project site is most significant to juvenile Chinook as it represents an important nearshore migration and feeding corridor. Chinook from nearby systems likely use this site as a foraging area during outmigration. Chinook migration tends to follow a bi-modal timing distribution. An earlier-timed"fiy"component, comprised of newly emerged fry that migrated between January and early April, is often followed by a later-timed"smolt"component comprised of larger chinook smolts that migrated from May through June. This being the case it is recommended that all grading and site preparation work be completed during the month of July. The close proximity of the project to the shoreline will require the strict application of Best Management Practices to prevent siltation and runoff impacts. PO Box 2854, Belfair,WA 98528 cell:360-620-0618,Office: 360-372-2421 e-mail: boad40@peoplepc.com Bennett HMP January,2007 Page 3 Hood Canal Summer Chum (Oncorhynchus keta)-Threatened Hood Canal Summer Chum migrate immediately to marine waters upon hatching. This reduces the mortality associated with the variable instream environment, but makes them more dependent on estuarine and marine habitats such as what exists at the project site. Known Hood Canal Summer Chum spawning areas in proximity to the site include the Union River and historically, the Tahuya River. Recovery efforts are in place to restore naturally spawning summer chum populations to the Tahuya system while the Union stock remains healthy. The marine shoreline associated with this parcel represents foraging and migration habitat for adult and juvenile summer chum. Summer chum may be present at the site from February through April. Construction timing and the strict adherence to Best Management Practices described for Chinook will be necessary to protect summer chum habitat as well. Bull Trout(Salvelinus malma)-Threatened Bull trout typically inhabit very cold, clear headwater streams at high elevations that are supported by snowmelt. For spawning and early rearing, bull trout require loose, clear gravel, relatively free of fine sediments. Bull trout populations are present in three distinct segments within the Skokomish watershed. Neither of these populations are expected to use the shoreline adjacent to the project area. Because of lack of Bull trout presence, no impacts are anticipated. Bald Eagle (Haliaeetus leucocephalus)-Threatened Habitat areas associated with Bald Eagle include uneven aged coniferous stands with some old-growth components. Nests are typically constructed in larger trees with dead or broken tops providing an unobstructed view of nearby water. Snags and trees with exposed lateral limbs, or dead tops are used as perches and defense stations. There are no documented Bald Eagle nesting sites in the vicinity of the project area. The proposed project site will require the removal of a maximum of twenty three trees. Although the trees to be removed do not contain nesting and roosting features important for the Bald Eagle, such as exposed lateral limbs or dead tops, the trees do offer an unobstructed view of nearby water, and have potential to be utilized by Bald Eagle. Native vegetation plantings defined in Section 6.3 are recommended to compensate for the loss of overstory components, and are expected to eventually provide habitat features important to the Bald Eagle in the future. Marbled Murrelet(Brachyramphus marmoratus)-Threatened Marbled Murrelets are typically associated with coastal habitats and nest in old-growth forests. Murrelets may fly as far as 50 miles inland to nest, however the average distance is roughly 5-miles from PO Box 2854, Belfair,WA 98528 cell:360-620-0618, Office: 360-372-2421 e-mail: boad40@peoplepc.com Bennett HMP January,2007 Page 4 nest to sea. It is only during the summer breeding months that they are commonly found inland. During non-nesting seasons they live at sea. Murrelets require tall mossy trees in coniferous old growth forests with cavities on thick branches where they can construct a cup nest 20-40 meters above the forest floor. Murreletts have been documented laying eggs on rocky ground habitats only when a sufficient forest is unavailable. There are no documented nesting sites surrounding the project site. No potential nesting trees are within the project area. This project will likely have no adverse impact on Marbled Murrelet given there are no documented nesting sites or potential nesting trees in the vicinity of the project area. 5.0 ANALYSIS OF EFFECTS The project lies within the regulated buffer of a Type S water. Project scale in the protected area is as follows: Development Type Habitat Type Project scale within buffer 2,250 sq. ft Single Family Residence Type S Water(buffer) 5600 sq. ft. 5.1 Vegetation Disturbance The overstory within the shoreline buffer contains Douglas Fir (Pseudotsuga menziesii), western red cedar (Thuja plicata) and Pacific madrone (Arbutus menziesii) of similar size and age (12-16" DBH). Many of the trees are leaning over or towards adjacent residences. The proposed residence would be in danger of any one of the trees within the property. This being the case, the project will require the removal of all trees within shoreline buffer with the exception of any trees located along the 15-foot strip adjacent to the shoreline. Native vegetation plantings described in Section 6.3 are recommended to eventially restore vegetation abundance and diversity within the lot, following completion of the project. 5.2 Designated Critical Habitat for Salmonids The shoreline adjacent to the project area has been listed as a final designation in the NOAA Fisheries Northwest Region Critical Habitat Designations for West Coast Salmon and Steelhead in Washington - August 2005. Best Management Practices are recommended to protect water quality and shoreline features. Impacts to upland vegetation located within the buffer area are unavoidable with the proposed project. Re vegetation following completion of the project is proposed to maintain long term diversity within the lot. 5.3 Noise Pollution An increase in noise from construction activities will occur during daylight construction hours. No nesting sites are located within the radii of concern that would be impacted by noise associated with the establishment of the SFR. Wildlife species residing in proximity to the project area have likely become adapted to noise associated with residential land use and the North Shore Road. 5.4 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 in Section 6.2 to minimize the adverse effects to sediment supply and turbidity during project implementation. PO Box 2854, Belfair,WA 98528 cell:360-620-0618,Office: 360-372-2421 e-mail: boad40@peoplepc.com Bennett HMP January,2007 Page 5 5.5 Light and Glare The proposed project will result in an increase in light and glare commonly associated with residential construction and land use. However, species that currently utilize available habitat along the Hood Canal are likely adapted to light and glare based on the high density of residential development along the shoreline. Therefore, an increase in light and glare is not likely to have a substantial impact on any wildlife that may occur in proximity to the site. 6.0 MITIGATION MEASURES 6.1 Minimization Mitigation The proposed project minimizes impacts to the shoreline buffer by limiting the square footage of the building footprint of the SFR to 2550 square feet. The proposed SFR is located 15 feet from the OHWM the nearest point, this is the furthest distance from the shoreline that the size and configuration of the lot will allow while meeting project objectives. 6.2 Restoration Recommendations To mitigate for the displacement of shoreline buffer necessary for this project, it is recommended that the remainder of the shoreline buffer, outside of the proposed building envelope, be replanted with native vegetation, following the completion of the work. The enhancement zone includes the 15-feet wide strip of shoreline buffer between the proposed SFR and the Ordinary High Water Mark of Hood Canal, and the remaining buffer east and west of the proposed SFR. The total area within the buffer that is recommended for native plant enhancement occupies approximately 3,000 square feet. The following species and potting sizes are recommended: Trees: western red cedar(Thuja plicata)- 2 gallon Douglas fir(Pseudotsuga menziesii)- 2 gallon Shrubs: Oregon grape (Mahonia nervosa)- 1 gallon salal (Gaultheria shallon)— 1 gallon evergreen huckleberry(Vaccinium ovatum) - gallon 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 California black currant(Ribes bracteosum)— 1 gallon western thimbleberry(Rubus parviflorus)— 1 gallon PO Box 2854, Belfair,WA 98528 cell:360-620-0618,Office: 360-372-2421 e-mail: boad40@peoplepc.com Bennett HMP January,2007 Page 6 red elderberry (Sambucus racemosa)— 1 gallon Ferns: sword fern(Polystichum munitum)— 1 gallon Native Planting Guidelines It is recommended that plantings be installed within the identified mitigation zone to achieve the following densities. trees- 10' on center shrubs-5' on center ferns- 3' on center These densities will provide a moderately dense, structurally diverse plant community within the mitigation zone. Typically, planting should occur during winter dormancy. The optimum time for planting is during February and March, however, the need to complete the project in a timely manner may call for planting to occur outside optimum time periods. No machinery earthwork will be necessary to implement this restoration plan; planting holes for specified vegetation installation will be hand dug. No additional clearing or grading should be necessary for site restoration. All installed vegetation shall be marked with colored flagging to facilitate monitoring inspections. The monitoring program is recommended to insure project effectiveness. Invasive species such as Himalayan blackberry, reed canary grass, Japanese knotweed, and English Ivy may invade the mitigation zone. These species are stubborn competitors for light and nutrients and limit success of native plants. Invasive species should be removed from the mitigation zone should they invade. Herbicides should not be used to achieve this due to the proximity to the stream. Persistent cutting during the growing season is sufficient to offset the rhizomes of invasive species if they become a problem. 6.2 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 along the waterward edge of the construction zone to prevent erosion and siltation of waters. • Following site work, seed all areas outside the building footprint using a native grass seed mix. • 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. • Clearly mark clearing limits with orange flagging or construction fencing. • 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,WA 98528 cell:360-620-0618, Office: 360-372-2421 e-mail: boad40@peoplepc.com Bennett HMP �. January,2007 Page 7 7.0 MONITORING Monitoring of the site will begin the first fall following native species plantings and maintained on a seasonal basis. The information gathered will provide the following: 1) condition of reintroduced plant species; 2) the use of the site by wildlife species; 3) any disturbance caused by the development and its effect on the protected zone and associated aquatic habitat; 4) any occurrence of exotic species within the mitigation zone; 5) any corrective measures that may be deemed necessary to provide desired conditions. This monitoring will be in effect for the duration of three years. The information gathered will be provided in an annual report and submitted to the Director of Mason County Department of Community Development. ment. 8.0 SUMMARY This report addresses the effects of the establishment of a 2250 square foot SFR within the regulated buffer of a type S waterbody (Hood Canal). Due to the high gradient topography within the parcel, the entire shoreline buffer landward of 15 feet from the waters edge must be regraded to create buildable area for an SFR. Best Management Practices are recommended to minimize negative impacts to the shoreline and aquatic habitat. Mitigation recommendations include native plant restoration of 3000 square feet of shoreline buffer, following completion of the project. Mitigation Measures, and Best Management Practices, have been identified to avoid, minimize, and mitigate for impacts associated with proposed construction. Photographs taken during our review of the site failed to adequately capture the project site due to steep terrain, and forested nature. For this reason they have not been included in this report. The Wetland Corps strongly encourages any county or agency staff reviewing this proposal to visit the site. We trust this information is sufficient for your needs at this time. Thank you for choosing The Wetland Corps as your environmental consultant. If you have any questions feel free to call. Respectfully submitted, Lee Boad Senior Ecologist Oltzmd_ Heather Lane Staff Wetland&Natural Resource Specialist PO Box 2854, Belfair,WA 98528 cell:360-620-0618,Office: 360-372-2421 e-mail: boad40@peoplepc.com REFERENCES Audobon WatchList. http;//audobon2.org/webapp/watchlist/viewSpecies. Knutson, K.L., and V.L. Naef, 1997. Management recommendations for Washington's priority habitats: riparian. Washington Department of Fish and Wildlife,Olympia. 181 pp. Native Plants for Kitsap County. fty://kcnpub3.co.kitsap.wa.us/pw/sw/Native Policy of Washington Department of Fish and Wildlife and Western Washington Treaty Tribes Concerning Wild Salmonids. Adopted by Washington Fish and Wildlife Commission,1997. PO Box 2854, Belfair,WA 98528 cell:360-620-0618. Office: 360-372-2421 e-mail: boad40@peoplepc.com IOPOZM North Shore Roacl . •. fT rt��' ,, P\`AV r/ �. ! �.I w f �,,54., •1. Approximate Parcel Location _ 1 f7 � � ! V r -uc f 11 N FIGURE 1 VICINITY MAP Project Name: Bennett HMP Location: Belfair,Washington Project: TWC07-W321 72 Client: Phil Bennett THE WETLAND CORPS Date: 1/07 ipue�) POOH i 1-11W u;;qeM I auoZ 491H haeu,pAo as l 0z, — —— pasodoad 166 00CA peon 9-a6 Lf+.ioN hem jo fib,� l0y pg1uLPa a!q ui pa9ia-qsap w) 99-Y P.19zeH apIITLel iIddy vOroad hq Plai}ui�a� papIAOJ J quay 9-Jrre9lfi IIV devv -'oTS ueld qu9w917eueVV le�TH W-4U9� 1% 31C 1 m J _ N t Map Legend e CONUs C.Unti Lake 0 cor+us sutes 100K tlw j V1IO�i�fi Lower 48 V%Uand Polygons Evow-ne and Marine Ovesrata PF01 C L*ww.nir d Marino Wetland n peM W.uand shington WMland PEM1A n pEM1C -� FrNnwsM.ioreWal�$1.ru0 Rr frefh/lalM Pond '�^ Lake E► l R E2EN11A . E2LJSN E1U6L�� � 0 E2AenAN r Approximate PUBH ~; Parcel Location f` Unw I Mason Lake rr! J/ Ulrr!!�i! { !! a„✓ 106 ;rrr{i,',C4'yY?i4�r{nrilikq�fY���.r,4;}{� S!'•yy?'i�'��?rl�r��' f r 'r Figure adapted from NWI Figure 3 National Wetland Inventory Map Mapper website Section 24 Township 22N Range 03W FIGURE 3 NWI MAP Project Name: Bennett HMP Location: Belfair, Washington Project: TWC07-W321 Client: Phil Bennett Date: 1/07 THE WETLAND CORPS Note: One mapped wetland in project vicinity (Hood Canal) r 4 fill k7"-AF" L Washinnto' � #7 Approximate Parcel Location Onsite Soil Conditions based on Mason County Soil Survey Subject Site Soil: Ek- Everett gravelly sandy loam, 15 to 30 percent slopes The Everett series consists of somewhat excessively drained,pale-brown gravelly soils.They occur as inextensive gravel ridges on the glacial moraines or,more commonly,as fairly continuous outwash channels between ridges of Alderwood soils.They have developed upon assorted glacial till and outwash material.The rainfall is 45 to 60 inches a year.The vegetation is mainly drought-resistant madrone, manzanita,and kinnikinnick.Everett soils are droughty because the loose gravel and sandy subsoil and substratum offer little resistance to downward movement of water.The capacity of the surface soil to hold available moisture is low.Everett soils are in the eastern half of the county,in association with the Alderwood soils.They also occur in intricate patterns with the Kitsap and Indianola soils.Compared to the Grove soils,the Everett soils have a paler surface soil and subsoil and,in development,were dominated more by acid igneous parent rock. Everett gravelly sandy loam, 15 to 30 percent slopes(Ek).-This soil is on the steeper slopes of glacial moraines,sides of gullies,and terrace fronts.It is closely associated with other Everett soils and the Alderwood gravelly sandy loams.This soil is more variable than Everett gravelly sandy loam,5 to 15 percent slopes.The depth to substratum ranges from 12 to 36 inches,and the amount of gravel in the surface soil and subsoil varies greatly from place to place.Where the soil is in close association with the Alderwood soils,the substratum, in places,is compact and weakly cemented.Included are a few areas having slopes slightly greater than 30 percent. FIGURE 4 SOIL SURVEY Project Name: Bennett HMP ^A%r Location: Belfair,Washington Project: TWC07-W321 Client: Phil Bennett THE ti1rETL_-AND CORPS Note: No listed hydric soils in project vicinity i t. yR r• rf ` y i I If R 705188 - ' 052 11 1705282 t f1; � f r7 !. 7�5168 17052t0 1705262 t + + + 8 Puget Sound Approximate location �fU .Puget Sounti SIREA2US SOILS ypStream Rater Te 1-5(East side} SLQPF __—__.� Hydric Soils Stream Type U--known(East s2de) Highly LJIIstabk Medium Slope Instability 1� Stream Wzter Type 1-5(West side) L � Highly Erodible Slope Instability v Stream Type U--known(West side) L/ � Highly Unstable& Highly Emdtble Water Type Change No Data or Ctsawl Pits FIGURE.5 DNR STREAM MAP Project Name: Bennett HMP Location: Belfair, Washington Project: TWC07-W321 Client: Phil Bennett THE WETTLk N D COR R Date: 1/07 Note: Mapped "U"and "N"stream in project vicinity,but not within parcel.