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HomeMy WebLinkAbout2005.08.00 - Mitigation PlanJ Sr^t/ City of Port Townsend Cleveland Street Mitigation Plan August 2005 Prepared for: Ciw Of PortTownsend Development Services DePartment 181 QuincY Stre€t Port Townsend, WA 98368 [-i!;ii;iiilviE AUG 2 I 20c5 C]IY UF PURi TUIVNStt./D ti ii tl 856 50th Sfreet Port Townsend, Washington 98368 36A 385-6432 dixie@cablesPeed.com City of Port Townsend Cleveland Street Mitigation Plan August 2005 Contents Introduction Mitigation Approach Project Goals and Objectives Planting Plan Habitat and Communities Installation Maintenance and Weed Control Inigation Monitoring Goals Performance Standards Contingency Plans Summary Table 1. Revegetation Plan Sheet #1 Revegetation Plan City of Port Townsend Cleveland Street Mitigation Plan August 2005 Introduction At the request of .Iean Walat, Port Townsend Development Services Department, a wetland delineation was conducted on the east side of a small isolated wetland on Cleveland Street south of 27th Street. The results from the delineation indicate that an area of the wetland and the majority of the buffer were cleared of all vegetation to access properties to be developed by Ed Underwood. This purpose of this report is to address the impacts through a revegetation plan. Mitigation Approach The road clearing process impacted approximately 2,400 square feet (16 feet wide by 140 linear feet) of wetland and 7,000 square feet of wetland and wetland buffer (50 feet wide by 140 linear feet). All areas within the mitigation site are within right-of ways owned by the City of Port Townsend. Maps of the mitigation zones and revegetation plan are included in the Appendix (Sheet #l). The 1O-foot wide linear path parallel to the west side of Cleveland Street will be revegetated with native trees and shrubs according to this plan. This planting plan proposes to cover an atea of approximately 1,650 square feet along the impacted areas. No remaining buffer vegetation should be removed. Direct impacts to the wetland will be mitigated through this revegetation plan. Project Goals and Objectives The goals and objectives for this project are as follows: o to revegetate the wetland buffers and designated areas along the disturbance caused by the clearing of Cleveland Street; o increase diversity of plant species with appropriate native trees and shrubs; o to remove or control non-indigenous plant species along the newly revegetated areas; r to guarantee the success of the project through maintenance and irrigation of planted species (guarantee by the City); and o to document the success of the project through monitoring . Planting Plan Habitat and Plant Communities All trees and shrubs will be planted according to the plan and will consist of native species that have know high survival rates on previous Port Townsend mitigation projects. Cleveland Street Mitigation Plan Report File Number 2005-8239-8 1 Olympic Wetland Resources, Inc 8/05 Species are to be planted within defined zones according to their water tolerance. Other considerations include food value for wildlife and ability to withstand deer grazing. A species list, specification of materials, and nurseries where plants can be purchased is located in the Appendix (Table 1). This plant list includes 13 trees and25 shrubs. Specific species include shore pine, red cedar, aspen,, red-flowering current, Indian plum, and red-osier dogwood. Installation All plant material should come from healthy plants grown in containers as specified in landscape plan. It is desirable to obtain plants that are adapted to this region and propagated in local nurseries. In general, trees should be planted 8 to10 feet apart and shrubs 3 to 5 feet apart. Native plant design encourages planting in communities to mimic the natural surroundings, rather than in rows or grids. Installing mulch circles (bark, wood chips, compost) around each tree and shrub should be required. The circles should be a minimum of 4 feet in diameter and 4 to 6 inches deep. Mulch circles act to preserve moisture, decrease root competition for water and nutrient fi'om grasses, and help to establish woody specimens. Maintenance and Weed Control 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. In addition to adding planted species, invasive non-native plants should be controlled or retnoved. This site has a high percentage of non-native thistles that could cover planted species. It is important to remove all weeds around newly planted trees and shrubs. Irrigation All planted species must be inigated to augment rainfall during the months of May through September. Trees and shrubs require a minimum of I inch of water per week or 2 inches every two weeks. Irrigation must continue for 2 to 3 years after final planting is complete to ensure the success of the revegetation project. During the third growing season watering can be less frequent (every 3 weeks) to encourage plant roots to spread out and "hunt" for water supplies. After three years plants should be able to survive with no watering. Monitoring Goals Monitoring will determine whether the performance standards identified in this mitigation plan are met. Primary performance standards require survivorship of 80% or greater of all planted species after the five year monitoring period. Non-desirable species include Scots' broom, thistle, and Himalayan blackberry. Cleveland Street Mitigation Plan Report File Number 2005-8239-8 2 Olympic Wetland Resources, Inc 8/05 Performance Standards 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. Survivorship of tree and shrub species is expected to be 80% or greater and will be determined during the monitoring process. The wetland buffer mitigation will be considered successful it80% or greater of desirable cover is achieved and the plants are healthy and vigorous. Contingency Plans The purpose of the contingency plan is to evaluate available alternatives if the Cleveland Street 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: o replanting of any dead vegetation in the first year and additional replanting if density goals are not met over the following four years and, . increased maintenance, which may include additional watering andlor weeding. Summary The eastern edge of a small Category III wetland and associated 50-foot buffers were cleared of all vegetation. Approximately 2,240 square feet of wetland and 7,000 square feet of buffer were impacted. A revegetation plan has been prepared enhance approximately 1,650 square feet along a l0 foot strip parallel to the areas impacted portion of Cleveland Street. Inigation and maintenance will be required to insure the success of planted species. Monitoring should be required to record survival rates and the success of this plan. If you need further help on this project do not hesitate to call. Dixie Llewellin Principal Biologist, Olympic Wetland Resources, Inc. Certified for Wetland Delineation, 1987 Manual Wetland Training Institute, June 1995 Cleveland Street Mitigation Plan Report File Number 2005-8239-B J Olympic Wetland Resources, lnc 8/05 Table 1. Cleveland Street Mitigation Revegetation Plan in ,l ") /r l'!/ t Name USFWS Location Condition Size Spacing QuantifyName Trees 5eal 10'a-)FACU upland containerBed6edarThuia plicata 7 to 8 feet 10FACwetlandcontainer5galAspenPopulus tremuloides 7 to 8 feet 8FACUwetland edge contarner 5galShore pinePinu,g contorta Shrubs container 2eal 4',5FACUuplandO lemler ia c er as iformis Indian plum 15contarner2eal1tJRed-osier dogwood FAC wetlandCornus stoloni/bra 2gal 5 5FACUuplandcontainerRibes sanguineum Red-flowering currant Total 46 Native Plant Nurseries Fourth Corner Nurseries, 3057 8.. Bakerview Road Bellingham WA 98226 (360) 734-0079 Shore Road Nursery, 616 Shore Road Port Angeles, WA 98362 (360) 457-8482 Sound Native Plants, P.O. Box 7505, Olyrnpia, WA 98507 (360) 943-7026 Woodbrook N ,1620 59th Ave. Gig Harbor WA 98335 265-6271 Cleveland Street Revegetation Olympic Wetland Resources, lnc. Iiile: RevegetationPlan Cleveland Street Port Townsend, WA0lympic llletlond Resources, 856 50th Street Port Townsend, ItllA 98368 360 385-6432 Cliem, City of Port Townsend Development Services DePartment 181 Quincy Street Port Townsend, WA 98368 Smle: As krdicated Shel #r lob#t 2005-8239-B 27th Street (cleared)Red cedar Indian plum Red-osier dogwood Aspen in wetland Shore pine Red-flowering currant in wetland buffer \!/\ V ', tl'V itr Y \ll I \i/ $' \/ V "[ \ilt / 'il' ,iti \y/ Lot sizes approximatell' I l0'X 54" 6. eoao o() u)ccaIaO 0 50'