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HomeMy WebLinkAboutBLD2011-00009 CASPs • • Clarberg Critical Areas Stewardship Plan Parcel #960 300 003 December 2010 Table of Contents Introduction Project Proposal Site Description Critical Areas Review Existing Conditions Habitat and Species Assessment Watershed and Hydrologic Assessment Potential Impacts of Proposed Development Critical Areas Stewardship Plan (CASP) Project Goals and Objectives Methodology Revegetation Landscape Specifications Installation and Maintenance Monitoring AS BUILT PLAN and Ongoing Monitoring Determining Survival Rates Performance Standards Contingency Plans Jefferson County Bond Guarantee Summary Limitations Appendices Sheet #1 Location, Soils, and Critical Areas Map Sheet #2 Existing Conditions Sheet #3 Critical Areas Stewardship Plan (base map by Little and Little Construction) Residential Best Management Practices (BMPs) Jefferson County Critical Areas Bond Quantity Worksheet Sample Monitoring Form • • Clarberg Critical Areas Stewardship Plan 161 Hiller Drive Port Hadlock WA 98339 Parcel #960 300 003 December 2010 6/1/ fZ 40(1./ yf`' av►s101 Prepared for: Otn. - ' S `r\C-Orl 1/ 91- s 1.-� Little and Little Construction * r+- L Pam 2009 4th Street Lpt,,i> Ov%-- n Port Townsend, WA 98368 :tit", t` JAN 1 2 2011 to \, $; JEFFE N CO�P��'! HD ,1 a?, s'si�s k iiipplitk,, 4,.:),5 di '0001410,-,“, . 400114. Olympic Wetland Resources 856 50th Street Port Townsend, Washington 98368 360 385-6432 dixie@cablespeed.com 1 • • The following sources were consulted for this project; Washington Department Fish and Wildlife (Tom Johnson, potential fish species near parcel), Donna Frostholm, Jefferson County DCD Critical Areas Specialist, and Little and Little Construction (site and storm water plan). Revegetation Final location of recommended plant species should be determined once construction is complete. Appropriate native trees and shrubs have been chosen according to the surrounding conditions and tolerance to salt spray and forest understory. Over time, planted species will function as additional structural and habitat layers for wildlife. Recommendations for approximate plant locations are included in the Appendix (Sheet#3 Critical Areas Stewardship Plan). Landscape Specifications Scientific Name Common Name Size Spacing Quantity Pinus contorta Shore pine 2 sal 6 to 8' 5 Rhododendron macrophyllum Pacific rhododendron 1 gal 6 to 8' 5 Ribes sanquineum Red-flowering currant 1 gal 4 to 5' 7 Thuja plicata Red cedar 2 gal 10' 3 Q vtb Total 20 , Sources For Native Plants Fourth Corner Nurseries, 3057 E. Bakerview Road, Bellingham, WA (360) 734-0079 Sound Native Plants, P.O. Box 7505, Olympia, WA 98507 (360) 943-7026 Woodbrook Nursery, 1620 59th Ave., Gig Harbor, WA 98335 (206) 265-6271 Installation and Maintenance All plant material should come from healthy plants grown in containers as specified; healthy bare root trees can also be used. It is desirable to obtain plants that are adapted to this region and propagated in local nurseries. The use of appropriate native species ensures that ongoing maintenance is minimized once the plants are established. All new plantings must become established to successfully out-compete aggressive non-native species. It is recommended to install new plants in the fall so roots can become established during the winter. Nursery specimens should be planted in dense groupings. In general,trees should be planted 8' to 10' apart and shrubs 3' to 5' apart. Native plant design encourages grouping of species in clusters to mimic the natural surroundings, rather than in rows or grids. Installing mulch circles (bark, wood chips, compost)to 3" deep and a minimum of 3' in diameter around each tree and shrub is recommended. Mulch circles help woody specimens become established by preserving moisture and reducing competition for nutrients from grasses. Success rates of a restoration project are greatly improved when commercial tree protectors are used on newly planted trees and shrubs. With this added protection, mortality is reduced during weeding and deer grazing. Irrigation may be required for the success of planted species through the dry summer months. If the planted species appear to be stressed in the summer months,they must be irrigated. Trees and shrubs require a minimum of 1 inch of water per week or 2 inches every two weeks from July thorough September. Irrigation systems are expensive, and hand watering could be done to ensure that the new trees and shrubs get enough water until they are established. Clarberg CASP Report File#2010-1222 4 December 2010 • • Potential Impacts of Proposed Development Short- term impacts during the building process will be minimized by careful construction practices. A total of 35 cubic yards of soil will be excavated for the addition footprint, of which 29 cubic yards will be hauled away and the remainder used as backfill around the foundation. Stockpiled soils will be covered with straw and be placed upland from the building site. No material will be stockpiled within the 30' setback from the shoreline. Silt fences,plastic sheeting, and straw wattles will be used around any disturbed areas to prevent sediment from entering Oak Bay. The total area of land disturbance for the addition will be approximately 730 square feet (calculated as 10' beyond actual building footprint). The building location consists of grass, and no trees or shrubs will be disturbed. The nearly flat landscape will not pose potential for erosion or siltation to Oak Bay if Best Management Practices (BMP) are followed during and after construction. There will be no alteration of surface water flows since the site is well drained, and final contours will follow the original landscape. Critical Areas Stewardship Plan The focus of this CASP is to mitigate any environmental impact within the shoreline buffer. According to the Code, "at a minimum,the CASP must provide equal or greater protection of critical area function and values that the prescriptive standards of buffer and setbacks." Project Goals and Objectives The goals and objectives for the Clarberg Stewardship Plan: • to add a 16' X 18' addition to an existing home outside of the 30' setback from the OHWM of Oak Bay (total size of finished addition 288 SF); • to re-vegetate the site with native trees and shrubs within the 150' buffer within FWHCA after final grading and construction are complete; • to mitigate 730 square feet for land disturbance (building envelope); • to guarantee the success of the project through maintenance and irrigation of planted species for at least 3 years until established; • to document the compliance with the Critical Areas Stewardship Plan with an AS BUILT report after construction and plantings are installed; • to document the success of the project and assure that the performance standards are met through an annual monitoring by a professional biologist for 5 years and; • to provide protective measures to minimize impacts to shorelines and buffers as outlined in 18.22.630 Residential Best Management Practices (BMP included in the Appendix). Methodology Mitigation requirements have been prepared to meet the standards described in the Department of Ecology, Guidance on Wetland Mitigation in the State of Washington (April 2004) and in accordance with prescribed requirements outlined by Jefferson County Unified Development Code, Critical Areas, Article IX 18.22.270 (FWHA) and 18.22.460 (CASP) (March 2008). This CASP summarizes functions and values of the existing buffer,problem areas infested with non-native species,vegetation for restoration, maintenance and monitoring schedules, performance standards and contingency plans. As outlined by CASP, an AS BUILT Plan requirement (18.22.510)will establish 2 or more photopoints and describe final planting and building locations once the project is complete. Clarberg CASP Report File#2010-1222 3 December 2010 • • Critical Areas Review The following section describes historic information associated with this parcel. Information was gathered from Internet search, existing critical areas maps, and communication with Jefferson County Department of Community Development. During the site assessment in December, information was verified for accuracy when possible. Existing Conditions Jefferson County Critical Areas Map indicates over one half of the parcel is within a wetland. The site was completely dry during this winter field site visit, even after several weeks of light rainfall. Hydric soils are not listed on this parcel, nor were they observed. No coastal wetlands/estuarine were observed; the OHWM is located directly behind the bulkhead and consists of a sandy/rocky beach. However, during high storm periods, seawater will spill over any bulkhead at these low elevation sites. Also indicated on the Jefferson County Critical Areas Map is the presence of a fish-bearing stream roughly parallel to Oak Bay and near the northwest corner of the parcel terminating at Portage Way. This stream,known locally as Little Goose Creek, has been altered. The outlet to this salmon-bearing creek now terminates south of the neighboring house at 141 Hiller Drive. This outlet into Oak Bay can be observed on clear aerial maps. Fish-bearing streams have 150' protective buffers; however, this addition is clearly outside of the buffer, which is developed with houses and driveways. The 150' buffer of the FWCHA has been mostly cleared of native vegetation. After the construction of the bulkhead,the site was backfilled and planted in lawn. Although there are scattered landscape plants and fruit trees on the parcel,the site has few native shrubs or trees. No invasive plant species were observed. In the northwest corner along Hiller Drive, several mature cedars Thuja plicata, Douglas firs Psuedosuga menzesii, and planted maple species are growing, creating multiple structural layers. Shoreline vegetation is sparse and consists primarily of small patches of wild rye Lemus mollis and beach searocket Cakile edentula. The location of existing vegetation can be clearly observed on the aerial map and photographs which are included in the Appendix (Sheet#2 Existing Conditions). Habitat and Species Assessment Habitats of local importance were evaluated within 1/3 of a mile of this parcel. All threatened or endangered plant or animal species were recorded and, if possible surveyed during the December 21, 2010, assessment. According to the GIS layer(provided by DCD), there are no spotted owls, marbled murrelets, or eagles near this parcel. Also there are no sensitive plant species listed in the adjacent landscape. All shorelines within Puget Sound are listed as potential habitat for threated or endangered fish species. The waters near the subject parcel have potential to support summer and fall Chum, Chinook, Pinks, Coho, and Steelhead. Watershed and Hydrologic Assessment This parcel drains towards Oak Bay and is within the Quilcene/Snow Water Resource Inventory Area (WRIA#17). The property rises upslope slightly to an elevation of 10 feet in the northwest corner, as indicated on the contour map. Surface water drains directly into Oak Bay in the same manner as the neighboring parcel. The soil type is Hoypus gravelly sandy loam (HcC) and Coastal Beaches (Co), which is listed by the Soil Conservation as"somewhat excessively drained, gravelly soil; nearly level formed over rolling glacial moraine terraces." Clarberg CASP Report File#2010-1222 2 December 2010 • • Clarberg Critical Areas Stewardship Plan Parcel #960 300 003 December 2010 Introduction Olympic Wetland Resources has been authorized by Bob Little of Little and Little Construction to perform a Critical Areas Stewardship Plan(CASP) for the subject parcel at 161 Hiller Drive, Port Hadlock, Washington Tax Parcel #960 300 003. During the site visits on December 21, 2010 the proposed project was reviewed, project boundaries examined, Ordinary High Water Mark defined, and the on-site vegetation recorded. The Jefferson County Department of Community Development is currently regulating shorelines according to the Unified Development Code revised March 2008 and the Shorelines Master Program (under revision). This project is within critical areas listed in Jefferson County and waters of Washington State and therefore requires a CASP. Project Proposal The proposed development includes the construction of a 16' by 18' addition attached to an existing waterfront home built in 1954 and remodeled in 1996. The building envelope will be well within property boundaries. All construction will take place outside of the 30' setback from the Ordinary High Water Mark(OHWM) of Oak Bay as required by Jefferson County Department of Community Development (UDC 18.25.410 Residential Development (j)). All waterfront projects are within the jurisdiction and designated buffer requirements of the Washington Department of Fish and Wildlife Habitat Conservation Areas (FWCHA). This 150' buffer extends landward and is measured perpendicular from the OHWM (Jefferson County Code, Critical Areas, FWHC,Table 18.22.270, Buffers for Other FWHCA, Locally Important Habitat Areas). This addition and the majority of the subject parcel fall within the 150' buffer of a FWHA. Site Description • Legal Description: Parcel 960 300, Lots 4 and 5 Hiller WF TR INC TL • Section 7 Township 29NN Range 1 E, East of Oak Bay Road • Location: 161 Hiller Drive, Port Hadlock, WA, Jefferson County, 1 mile south of Port Hadlock Maps indicating site location, soils, and critical areas are included in the Appendix (Sheet#1). The total area of the 2 lots is 11,542 square feet with approximately 120' of low-bank waterfront bordering Oak Bay. The OHWM is clearly defined by a 4' concrete bulkhead built in 1996 that is anchored with large, chained timbers. Although the site is relatively flat, the access to the house and garage from Hiller Drive is slightly down-gradient. The existing house and garage are sited on Lot 5; outbuilding and proposed addition are on Lot 4. The water side of the original home is approximately 27 feet back from the OHWM, as are the majority of the neighboring homes along Hiller Drive. The proposed addition measures 52' back from the shoreline (OHWM), as indicated on the plans from Little and Little Construction. Clarberg CASP Report File#2010-1222 1 December 2010 • Monitoring AS BUILT PLAN and Ongoing Monitoring Methodology As required by CASP, an AS BUILT PLAN will be submitted to Jefferson County after the addition to the original home and the revegetation project is complete. The report will include the final location of the homesite,tree and shrub species, and photopoint locations with photographs. After the report is submitted,the site will be inspected by the wetland specialist of Jefferson County Department of Community Development. Ongoing annual monitoring will be conducted for 5 years. All years will require a report submitted to Jefferson County Department of Community Development with the exception of Year 4. This monitoring will occur during the growing season in late June or early July and will contain a general description of the site and condition of the planted areas. Counts will be made of all species that need to be replaced, and the location of undesirable weed infestations will be recorded. Monitoring and Maintenance Schedule AS BUILT PLAN Year 1 Year 2 Year 3 Year 4 Year 5 Maintenance Planting Irrigation Replace plants as needed Monitoring Vegetation and Habitat Photopoint Annual Report Determining Survival Rates A monitoring form will be used to determine plant survivorship, species density, and general condition of planted species. This information will determine whether plant survivorship and percent cover provided are sufficient to meet the performance standards. A sample monitoring form is included in the Appendix. Performance Standards Monitoring will determine whether the performance standards identified in this CASP are met. The proposed length of time for mitigation compliance is five years. This time period will allow for the planted and volunteer species to become established. Enhancement will be considered successful if the buffer plantings meet the following criteria: • Survivorship of installed tree and shrub species is expected to be 100% after the first growing season. All plants that do not survive the first year should be replanted. • Survivorship of installed tree and shrub species is expected to be 80% from year 2 through year 5. Species will be replanted until the monitoring period is complete. • This Critical Areas Stewardship Plan is considered successful if 80% or greater of desirable cover is achieved and the plants are healthy and vigorous during the fifth year of monitoring. Desirable species also include volunteer native trees and shrubs. • No more than 10% invasive species should be present at any time during the monitoring process. Non-desirable species include Scots' broom, English ivy, and Himalayan blackberry. Clarberg CASP Report File#2010-1222 5 December 2010 • • Contingency Plans The purpose of the contingency plan is to evaluate available alternatives if monitoring indicates that the project goal and objectives have not been achieved. Contingency plans will vary depending upon which goals have not been met and will apply to each specific mitigation activity. Appropriate corrective action will be recommended after the first year of the monitoring process and will include the following: • replanting of any dead vegetation in the first year and additional replanting if density goals are not met over the following four years; • increased maintenance, which may include additional watering and/or weeding; • additional protection to established buffers to compensate for the length of completion of mitigation if the density goals are not being met. Jefferson County Bond Guarantee To guarantee the success of the project, a financial bond will be submitted to Jefferson County for the duration of the project through the five years of monitoring. A spreadsheet(Jefferson County Critical Areas Bond Quantity Worksheet) is included in the Appendix. Summary The proposed 16' X 18' addition to an existing home will fall outside the 30' shoreline setbacks as regulated by Jefferson County building code and within the 150' Fish and Wildlife Conservation Areas buffer associated with Puget Sound shorelines. These waters have the potential to support federally listed and endangered fish species. This Critical Areas Stewardship Plan has been designed to increase existing buffer conditions. If the elements of this Plan are followed as outlined,the site will have higher buffer function and a greater habitat value and diversity. Major components of the Plan will be to install native trees and shrubs as protective buffers and to provide habitat opportunity for bird and wildlife species. Plant species have been chosen that are known to adapt to local site conditions. Success of this project will be monitored after construction and installation are complete with an"AS BUILT"report followed by 5 years of monitoring. All reports will be submitted to Jefferson County Department of Community Development in the same year as the monitoring. Limitations The final authority over approval of this CASP will be Jefferson County Department of Community Development. Jurisdictional authority over shorelines rests with the local, state and federal agencies. If there are further questions or planning requirements for this project, please do not hesitate to call. 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