1701 121ST ST SE 2025-02-03 - Laserfiche WebLink

6.2.2 Post-Enhancement Buffer Conditions Enhancement will be comprised of removing invasive species and planting a diverse array of native trees and shrubs Installing dense woody material will reduce hydrologic flow rates and improve water quality in areas currently dominated by English ivy. These functions will be maintained in areas currently vegetated with dense Himalayan blackberry. Habitat functions will be improved across the mitigation site by increasing species richness and structural diversity in the buffer. Overall, the buffer enhancement plan will increase the functions and values provided by on-site wetland and stream buffers. 6.3 GRA.Ss SEEDING Historic parking lot areas that were removed as part of the parking lot reduction will be reseed with grass seeding. Buffer enhancement is inappropriate in these areas as plant growth would be restricted by maintenance to ensure that the parking area is usable. The following grass mixture shall be sewn in areas where parking lot and associated pavement are removed. 6.3.1 Buffer Mix COMMON NAME LATIN NAME LBs/1 000 S.F. Tall fescue Festuca arundinacea 0.4 Colonial bentgrass Agrostis tenuis 0.4 Annual ryegrass Lolium multiiorum 0.5 Red clover Trifolium repens 0.2 This mitigation plan is consistent with the revised version of the Washington State Department of Ecology's (WSDOE) Guidelines for Devel*hW Freshwater Wetlands Mitigation Plans and Proposals, titled Wetland Mitigation in Washington State—Part 2:Developing Mitigation Plans. The proposed restoration plan is expected to provide superior biological functions than existing conditions. 6.4 INVASIVE PLANT AND LITTER REMOVAL Before planting occurs, invasive species within the on-site wetland and buffer area, including but not limited to Himalayan blackberry (Rubus armeniacus),English ivy(Hedera helix), and English holly (Ilex aquifolium)shall be removed. Since these invasive species may be intermixed with natives,hand- removal is recommended. All invasive plant debris, including roots, stems, and foliage, shall be hauled off site after removal. Throughout the monitoring period, any invasive species that re- sprouts shall be promptly removed by hand. Any debris/litter found in the stream, wetland, or buffer during invasive plant removal or planting activities shall be removed from site. 6.5 PROJECT AND PLANTING NOTES Plant in the early spring or late fall and obtain all plants from a reputable nursery. Care and handling of all plant materials is extremely important to the overall success of the project. The origin of all plant materials specified in this plan shall be native plants,nursery grown in the Puget Sound region of Washington. Some species substitution may be allowed due to the availability of plants, only with the agreement of the wetland professional and/or City staff. Charter Club Apartments 16 RU#23061 Critical Area Report&Mi4ation Plan November 6, 2023