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Home My WebLink AboutBLD2008-00099 Mitigation • • JUL 21 2009 Wei Zhou Mitigation and Monitoring Plan Addendum to Mitigation Plan (Jan 09) Parcel # 961 500 101 MLA#0800123 June 2009 Prepared for: Wei Zhou 200 Kincaid Port Hadlock, WA 98339 v✓ ' 0 ymplc am ' esources, Inc. M1 w 856 50th Street Port Townsend, Washington 98368 360 385-6432 dixiellewellin@yahoo.com • Wei Zhou Mitigation And Monitoring Plan Addendum to Mitigation Plan (Jan 09) Parcel # 961 500 101 June 2009 Table of Contents Introduction Project Goals and Objectives Best Management Practices Revegetation Installation Maintenance and Weed Control Irrigation Monitoring Plan Monitoring Methodology Monitoring and Maintenance Schedule Determining Survival Rates Performance Standards Contingency Plans Summary Appendices Sheet #1 Site Plan and Buffer Impacts Sheet #2 Mitigation Plan • Wei Zhou Mitigation and Monitoring Plan Parcel# 961 500 101 MLA# 0800123 June 2009 RE: Addendum to Mitigation Plan Introduction This addendum to the original Wei Zhou Mitigation Plan (submitted in January 2009) addresses the redesigns of the home site which will now have permanent buffer impacts. The building site is defined by installed septic, a redesigned septic reserve, and is between two wetland buffers. The high quality wetland (Wetland A) and buffer will not be impacted. The smaller wetland(Wetland B) will need to have a buffer reduction from 50 feet to 35 feet since there are NO available alternatives. The 20' by 28' two story home will permanently impact 900 sq. ft. of buffer(-15' X 60'). To mitigate for this buffer loss over 900 sq.ft. replanted with appropriate native trees and shrubs. The driveway will be adjacent and outside the buffer of Wetland B and therefore will have minimal impacts. As defined in the original mitigation plan the project will meet the standards outlined in the Department of Ecology,Guidance on Wetland Mitigation in the State of Washington State (March 2006). A required maintenance and monitoring component has been added to this project. A map in the Appendix shows the proposed building envelope,trees that need to be removed, and the impacted buffer area(Sheet#1, Site Impacts). The Mitigation Plan(Sheet#2) includes home site location, and replanting zones which will be planted when all grading is complete. The updated plant and landscape specifications are also included in the Appendix. Project Goals and Objectives • to avoid any impacts to Wetland A and; • to reduced buffer of Wetland B by from 50 feet to 35 feet from the back property boundary for 70 feet (approximately 900 sq. ft. reduction, see Sheet#1); • to fence the new buffer boundary prior to site clearing and with permanent fencing when home is complete; • to maintain original contours and revegetate buffer impacts with a dense planting of native species (Sheet#2), and; • to control the small populations of non native species which include reed canarygrass and thistle, and; • to provide protective measures during the construction process to minimize impacts to wetlands or buffers (BMP's during and after construction, outlined below), and ; • to guarantee the success of the project through maintenance and monitoring for a period of 5 (five) years. Wei Zhou Mitigation and Monitoring Plan 1 Olympic Wetland Resources,Inc. Report File Number 2008-0308 June 2009 • • • Best Management Practices (BMP's) Prior to any clearing or excavating the construction boundaries should be clearly marked with silt fencing to prevent sediment passage or impacts to additional portions the wetland buffer. Excavated soils will be stockpiled outside of all wetlands or wetland buffers. BMP's are those practices as defined by the Jefferson County, State of Washington Department of Agriculture, State of Washington Department of Ecology, State of Washington Department of Fish and Wildlife, conservation district, and other professional organizations. These Conservation Practices will be implemented at all times during and after construction. 1. Avoid or control soil loss and protect water quality from degradation caused by nutrients, animal waste, toxins, and sediment; and 2. Avoid or minimize adverse impacts to surface water and ground water flow, and circulation patterns; and 3. Avoid or control the movement of sediment and erosion control caused by land alteration activities. It is recommended that the project to be conducted during dry weather to minimize runoff. All soils should be stabilized with straw and re-seeded; and; 4. Avoid or minimize adverse impacts to the chemical, physical, and biological characteristics of critical areas; and 5. No fertilizers, pesticides, or other lawn chemicals will be applied to the yard or adjacent buffer vegetation. 6. A silt fence should be installed to guarantee that no sediments enter the wetland during construction. Revegetation Final location of recommended plant species should be determined after final grading and construction is complete. It should be noted that a mature cedar and fir(26"dbh and 24"dbh) are adjacent to the building site and should be retained. These trees should be clearly marked as DO NOT CUT prior to clearing for the home site. Several mature trees will need to be removed during clearing as indicated on the Site Impact Map. The Mitigation Plan includes planting zones and Landscape Specifications. The Landscape Specifications includes size, quantity, and spacing for each species recommended for this project. These native trees and shrubs should thrive at this site since soils have had minimal disturbance and will be shaded and protected by the adjacent forest. Soils may need to be amended additional compost for the success of planted species. Since deer frequently graze this area plants may require either planting tubes or fencing. A total of 15 trees and 20 shrubs are included in this enhancement plan which includes red cedar, Douglas fir, aspen, red osier dogwood, ninebark, and hazelnut. Installation All plant material should come from plants grown in containers as specified. It is desirable to obtain plants that are adapted to this region and propagated in local nurseries. If bare root plants are substituted the total number should be at least 25%higher than in the Landscape Plan due to lower survival rate. Wei Zhou Mitigation and Monitoring Plan 2 Olympic Wetland Resources,Inc. Report File Number 2008-0308 June 2009 . • Nursery specimens should be planted in dense groupings. In general, trees should be planted 8 to 10 feet apart and shrubs 3 to 5 feet apart. Native plant design encourages grouping of species in clusters to mimic the natural surroundings, however for easy maintenance species could be planted in rows or grids. Installing mulch circles (bark,wood chips, compost) to 3" deep and a minimum of 3 feet in diameter around each tree and shrub is highly recommended. Mulch circles help woody specimens become established by preserving moisture and reducing competition for nutrients from weeds and 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. Maintenance and Weed Control The use of appropriate native species ensures that ongoing maintenance is minimized over time. All new plantings must become established to successfully out-compete weeds. This will require at least 3 years of maintenance and weeding. In the years following the initial planting adding layering additional mulch around the plants will minimize weeds as well as enrich the soils. Irrigation Irrigation may be required for the success of planted species through the dry summer months. In the low-lying areas of the site hydrology may be present year-round. 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. Monitoring Plan Monitoring Methodology As required by Jefferson County monitoring is required when wetland or wetland buffers are permanently impacted. Ongoing annual monitoring will be conducted for 5 years by a professional biologist. All years will require a report submitted to Jefferson County Department of Community Development. After the report is submitted, the site may be inspected by the wetland specialist of Jefferson County Department of Community Development. 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. Photopoints will be established to evaluate ongoing success of the re-vegetation project. The report will include the number of species planted, mortality, and undesirable weed infestations. Unhealthy or dead plants that should be replaced and invasive weeds removed. The monitoring should begin as soon as the home has been built and the re-vegetation project is complete. The report will include the final location of tree and shrub species, and photopoint locations with photographs. Wei Zhou Mitigation and Monitoring Plan 3 Olympic Wetland Resources,Inc. Report File Number 2008-0308 June 2009 • • , Monitoring and Maintenance Schedule Finished project Year 1 Year 2 Year 3 Year 4 Year 5 Maintenance Planting Maintenance 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. Performance Standards Monitoring will determine whether the performance standards outlined below 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. • The wetland buffer mitigation 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 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, reed canarygrass, poison hemlock, thistle, (both Canadian and bull), and Himalayan blackberry. 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; Wei Zhou Mitigation and Monitoring Plan 4 Olympic Wetland Resources,Inc. Report File Number 2008-0308 June 2009 • • • increased maintenance, which may include additional watering and/or weeding; Summary The Zhou single family residence will fall within a wetland buffer and will require a permanent buffer reduction from 50 feet to 35 feet(approximately 900 sq.ft.). This Mitigation and Monitoring Plan addresses construction impacts and buffer losses by re-vegetating the buffer with native trees and shrubs after the final grading and construction are complete. Native trees and shrubs will be planted within specific zones according to wetland tolerance. A short fence will be built to define the new buffer edge. If the plan is followed as outlined the functions and values of wetland buffers will be enhanced over time. A final building inspection to verify compliance of this mitigation plan should be required prior to an occupancy permit. The final authority over this Mitigation and Monitoring Plan rests with the Jefferson County Department of Community Development. If there are further planning requirements or adjustment do not hesitate to call. I Dixie Llewellin Principal Biologist, Olympic Wetland Resources Certified for Wetland Delineation, 1987 Manual WTI, June 1995 DOE Rating Certified 2007, Mitigation Manual Certified 2008 Wei Zhou Mitigation and Monitoring Plan 5 Olympic Wetland Resources,Inc. Report File Number 2008-0308 June 2009 • • � ! • 0 0 1 U 2cT � �y •� , i. ✓ F+-1 r • ii a~°'. i O M O o o 00 hi as OO — v aCti s.- i = v (I.) En a) oo x = p; W oo M Q\ M . Gj r Q `— . Q I E . 0 = clCA — . tiH Nix 00 o •�,, 0 ►�'(►D I— Q g Q [� � j$( W W 2 o ..... cc N co tua o E Igtgyp( . V , N O • V O _ I S3 C N �' ______---9----- ----- .[ �._ CA a� 1CD'CT CO L-.-rr � .,. LA, cz,Lc> ,I., . ........ s-. 1 ,..±-....( -0 l 0 • 0 � x .0ia N Ca. ' U ei a a.; � � as ° b O rx ✓a ti y I III • O i._ r. N r. N .. r. 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Street Port Townsend, Washington 98368 360 385-6432 dixiellewellin( yahoo.com Wei Zhou Mitigation Plan Parcel # 961 500 101 January 2009 Table of Contents Introduction Project Proposal Mitigation Plan Existing Conditions Project Goals and Objectives Best Management Practices Revegetation Installation Maintenance and Weed Control Irrigation Summary Appendices Sheet #1 Site Plan and Buffer Impacts Sheet #2 Mitigation Plan Plant List and Landscape Specifications Installation Specifications and Recommendation MAR 18MN • Wei Zhou Mitigation Plan Parcel# 961 500 101 MLA# 0800123 January 2009 Introduction Two wetlands were identified on the Zhou parcel at 130 Johnson Ave. during a reconnaissance in 1996 and confirmed in February 2008. These wetlands are located along the east and west boundaries of this - 260' X 100' lot in the Cape George Highlands. Both wetlands were categorized as Category III wetlands during a delineation by Olympic Wetland Resources, Inc (March 2008). Category III wetlands are assigned 50-foot buffers (Jefferson County UDC January 2001). A mound septic system was installed between the wetland buffers in 2001 prior to the delineation making a homesite location outside buffers difficult. The goal of this Mitigation Plan is to locate the optimum location for a building envelope while protecting the existing critical areas. All efforts have been made to minimize wetland or wetland buffer impacts. The wetland on the eastern edge of the parcel (Wetland A) is a high quality system with standing water, a tangled shrub understory, and a high diversity of woody species. The wetland on the western property boundary (Wetland B) is a smaller system with degraded buffers. The buffer was altered during the septic system installation and also significantly impacted during construction of a new home on the adjacent lot. The best choice for a building envelope is between the impacted buffer of Wetland B and the existing septic system mound. To accommodate the construction of the home, a portion of the already impacted buffer of Wetland B will need to be temporarily altered The building envelope will be outside of Wetland A and its associated buffer so there will be no impacts to this higher quality wetland. Project Proposal A proposed 20' X 62' single family residence and access driveway are proposed on a parcel that has a septic system and access to the Cape George community water system. The reserve area for the original septic system was located adjacent to the buffer of Wetland B which left no options for building anywhere on the parcel. The reserve area has been redesigned by Nathan Cleaver Septic Design, Inc. (November 2008) to accommodate one small homesite outside of buffers. The simple rectangular home design will include a garage at the end of the structure. Access to the garage will be directly from Johnson Ave. making a turnaround unnecessary. The 5-foot setback from the septic and the 10-foot setback from the drainfield have been calculated into the homesite location. Approximately 1,500 sq. ft. (100' X 15') of the Wetland B buffer will be impacted during 1 8 2009 excavation and construction of the home. Impacts will be temporary and will be mitigated through this Wei Zhou Mitigation Plan 1 Olympic Wetland Resources,Inc. Report File Number 2008-0308 January 2009 • proposal. After final construction is complete the buffers will be contoured to original slopes and re- vegetated with native trees and shrubs. Mitigation Plan Mitigation requirements have been prepared to meet the standards outlined in the Department of Ecology, Guidance on Wetland Mitigation in the State of Washington State (March 2006). The Zhou Mitigation Plan summarizes functions and values of the existing conditions, vegetation for restoration, and a voluntary maintenance schedule. The Site Plan showing the installed septic system and redesigned reserve, proposed home location, setbacks, and impacted buffer area is included in the Appendix (Sheet#1). The Mitigation Plan(Sheet #2) includes zones and species to be planted after the final grading and construction are complete. The plant and landscape specifications are also included in the Appendix. Existing Conditions The gradually sloping parcel consists of a mix of evergreen and deciduous tree cover with an understory of upland and water tolerant shrubs. Native species dominate the site with over 20 species recorded (Wetland Delineation 2008). The herbaceous understory includes sedges, rushes, water parsley and sword fern with a shrub layer of salmonberry, hardhack, vine maple, Oregon grape, and huckleberry. The tree layer is dominated by mature cedars and Douglas-fir. Only a few invasive weeds patches were identified in disturbed soils and include Scot's broom and Himalayan blackberry. The two wetlands are roughly parallel and fall within distinct swales along the east and west property boundaries. They drain to the north along roadside ditches and across Johnson Ave. Project Goals and Objectives The goals and objectives for the septic site: • to avoid any impacts to Wetland A and; • to minimize impacts to the buffer of Wetland B by maintaining original contours and revegetate buffer impacts (approximately 1,500 sq. ft.) after all grading is complete, and; • to increase diversity of plant species and structural layers with a dense planting of native species, and; • to control the small populations of non native species which include reed canarygrass and thistle, and; • to provide protective measures during the construction process to minimize impacts to wetlands or buffers (BMP's during and after construction, outlined below), and ; • to guarantee the success of the project through voluntary maintenance and irrigation of planted species as needed. Best Management Practices (BMP's) Prior to any clearing or excavating the construction boundaries should be clearly marked with silt fencing to prevent sediment passage or impacts to additional portions the wetland buffer. Excavated soils will be stockpiled outside of all wetlands or wetland buffers. MAR 1 8 2009 Wei Zhou Mitigation Plan 2 Olympic Wetland Resources,Inc. Report File Number 2008-0308 January 2009 • BMP's are those practices as defined by the Jefferson County, State of Washington Department of Agriculture, State of Washington Department of Ecology, State of Washington Department of Fish and Wildlife, conservation district, and other professional organizations. These Conservation Practices will be implemented at all times during and after construction. 1. Avoid or control soil loss and protect water quality from degradation caused by nutrients, animal waste, toxins, and sediment; and 2. Avoid or minimize adverse impacts to surface water and ground water flow, and circulation patterns; and 4 3. Avoid or control the movement of sediment and erosion control caused by land alteration activities. It is recommended that the project to be conducted during dry weather to minimize runoff. All soils should be stabilized with straw and re-seeded; and; 4. Avoid or minimize adverse impacts to the chemical, physical, and biological characteristics of critical areas; and 5. No fertilizers, pesticides, or other lawn chemicals will be applied to the yard or adjacent buffer vegetation. 6. A silt fence should be installed to guarantee that no sediments enter the wetland during construction. Revegetation Final location of recommended plant species should be determined when final grading and construction is complete. It should be noted that mature cedars are adjacent to the building site and in the wetland buffer that could be impacted. During clearing, if possible these cedars should be retained. The Mitigation Plan includes a list of native trees and shrubs that will be appropriate for this site. Soils may need to be amended with imported soils and compost for the success of planted species. Success rates should be high since the newly planted species will be shaded and protected by the surrounding forest. Since deer grazing may be a problem all plants will require either planting tubes or fences. A total of 15 trees and 20 shrubs are included in this enhancement plan which includes red cedar, Douglas fir, aspen, red osier dogwood, ninebark, and hazelnut. Installation All plant material should come from plants grown in containers as specified. It is desirable to obtain plants that are adapted to this region and propagated in local nurseries. If bare root plants are substituted the total number should be at least 25% higher than in the Landscape Plan due to lower survival rate. Nursery specimens should be planted in dense groupings. In general, trees should be planted 8 to 10 feet apart and shrubs 3 to 5 feet apart. Native plant design encourages grouping of species in clusters to mimic the natural surroundings, however for easy maintenance species could be planted in rows or grids. Installing mulch circles (bark, wood chips, compost)to 3" deep and a minimum of 3 feet in diameter around each tree and shrub is highly recommended. Mulch circles help woody specimens become established by preserving moisture and reducing competition for nutrients from weeds and 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. MAR 1 8 2009 Wei Zhou Mitigation Plan 3 Olympic Wetland Resources,Inc. Report File Number 2008-0308 January 2009 Maintenance and Weed Control The use of appropriate native species ensures that ongoing maintenance is minimized over time. All new plantings must become established to successfully out-compete weeds. This will require at least 3 years of maintenance and weeding. In the years following the initial planting adding layering additional mulch around the plants will minimize weeds as well as enrich the soils. Irrigation Irrigation may be required for the success of planted species through the dry summer months. In the low-lying areas of the site hydrology may be present year-round. 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. Summary The only feasible building site with the least impacts to the critical areas on the Zhou parcel is between the installed septic system and directly parallel to the buffer of Wetland B. The site plan has been designed to have minimal environmental degradation to surrounding critical areas by minimizing infrastructures and impervious area. The building envelope is sited to avoid impacts to the more biologically diverse wetland (Wetland A) and its' associated buffers. The only way to accommodate site excavation and homesite construction will be to temporally impact a linear portion (approximately 1,500 sq.ft.) of the buffer of Wetland B. This voluntary mitigation plan addresses construction impacts by revegetating the buffer with native trees and shrubs after the final grading is complete. If the plan is followed as outlined the functions and values of wetland buffers will be enhanced over time. The final building inspection by Jefferson County, prior to an occupancy permit should include an inspection and approval of this mitigation plan. All plants should be installed in zones, which relate to a species water tolerance as described in this plan. The final authority over this Wetland Mitigation Plan rests with the Jefferson County Department of Community Development. If there are further planning requirements or adjustment to this mitigation plan do not hesitate to call. Dixie Llewellin Principal Biologist, Olympic Wetland Resources, Inc. Certified for Wetland Delineation, 1987 Manual WTI, June 1995 DOE Rating Certified 2007, Mitigation Manual Certified 2008 MAR 1 8 2009 Wei Zhou Mitigation Plan 4 Olympic Wetland Resources,Inc. Report File Number 2008-0308 January 2009 0 v u a c y T III - O io Q y u m > > `pro ON 1:3 ® z- C � - (0, CO@ N v., Qi m c L v ar 3 �.0 3 zE> a ya, cd a o -J g- o `' c 3- i Qr W z0 V.) 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Z — t °'x MAR 1 8 2009 � r x '/ �'" wetland B Wei Zhou Plant List IIIIIIIIIIIIIIIIIMMlli Populus tremuloides Aspen 1-2 gal 8 5 1 Psudotsuga menzesii Douglas' fir 1-2 gal 10' 5 2 1Thujaplicata Red cedar 1-2ga1 10' _ 5 1 Total Trees 15 Ribes sanguineum Red-flowering currant 1-2gal 4to 5" 6 2 Corlyus cornuta Hazelnut 1-2gal 4to 5" 6 1 Cornus stolonifera Red-osier dogwood 2gal 5' 8 1 Total Shrubs 20 Total Plants 35 * Plants in Zone 1 have a greater tolerance for water than plants in Zone 2 Legend Scientific and common names: Scientific name according to Hitchcock and Conquist(1976) Flora of the Pacific Northwest Size:As typically planted for restoration projects. Spacing: Recommended spacings. Quantity: Total number of plants for project. Native Plant Nurseries Fourth Corner Nurseries, 3057 E. Bakerview Road Bellingham WA 98226 (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 MAR 18 2009 Installation Specifications and Recommendations Fall Installation Planting should be installed between mid-September and mid-November, unless the new • plantings can be watered throughout the summer. Plantings installed in the fall generally outperform those installed in the late winter or spring. Plants put in the ground in the fall have the advantage of an extended period for root growth before rapid top growth in the spring. In the fall,the soil is warmer and more aerated than in the spring and most plants experience active root growth during this time. The cool, cloudy days and frequent precipitation of fall and winter also provide ideal transplanting conditions. Until sufficient root systems develop, newly installed plants will undergo transplanting stress that can be exacerbated by hot sunny days. Fall and winter weather allows for reduced transpiration and provides ample moisture for the roots while the plant recovers from transplant shock. Root Disturbance Immediately before installation plants with broken, damaged, or twisted roots must be pruned. Matted or circling roots of containerized plantings must be pruned or straightened and the sides of the root ball must be roughened from top to bottom to a depth of approximately half an inch in two to four places. If circling roots are left, they may eventually girdle the plant as they grow and thicken in place. If the roots at the edge of the root ball are straightened and extended,they will have access to a greater volume of soil in the planting hole. Also, the roughened edges of the root ball will have better contact with the backfill soil. Disturbing and removing one-fourth to one-half of the roots in the outer inch of the root ball will damage only the most sensitive plants; most often,this treatment actually stimulates increased plant growth. Plant Depth The finished height of each plant's root ball will be slightly higher than that of the surrounding soil. The exception is for sandy soils, in which case the soil heights will be even. The top of the root ball will not be covered with backfill soil. A watering basin will be formed around each planting by building a berm of soil at least 30 inches in diameter. When planting a container-grown plant, the top of the root ball should npt be covered with any other soil. Covering the root ball with soil, particularly if it has a finer texture than the potting or field-growing soil, will generally cause water to flow around the root ball instead of into it; root balls covered in this way may receive water only from below. To allow direct wetting of the root ball from MAR 1 8 2009 1