1600 121ST ST SE 2016-01-01 MF Import

the inFlow end oumow dunng a nortnal rainfall year relative to existin�3 and post construction condi6ons must be provided. Pnor to application for building pertnits and plan re.view by the Public Works Department, a charactenzation of the hydrology of the wetlands on or adjacent to this project that may be affected by the developmant of this site must be reviewed and approved by the Planning Department. (Sf_=PA Water and Plant and Animal Policies) 15. The drainage plan must inGude a pipe or swale to convey lake overflows and discharge it at ;he naturelly occurting location. (SEPA Water Policies) 16. All stortnwater runoH irom the paved areas of the site must be routed through either a baffle-type oil/water separator in series with a vegetated swale or through a wetpond prior to discharge of the stortnwater from the site or to stream or wetland areas. These water qualiry enhancing fadlities must be designed in accordance with City Standards, consWcted in conjundion with Phase I development, and should be sized for all anticipated future stortnwater runaff irom both phases of the project. When a vegetated swale is provided for water qualiry enhancement of stortn water, a minimum of 10 feet of essentially flat ground must be provided between the swale s id any adjacent buildings, unless othervvise approved by the Fire Marshal. The required vegetated swales or wetpond must be provided outside of wetlands, sVeams, and their buHers. The swales or wetpond must be shown on the required landscaping plan, as well as on Public Works drainage plans. (SEPA Plant and Animal and Water Poliaes) 17. Wetland Mitioation Proposal Phase I. The proposal includes the fill of .204 acre of wetland on Phase I. MiUgation would be provided by the .14 acre expansion of an exisUng wetland, the enhancement of a wetland buffer, and the enhancement and rehabilitation of the northem finger of an existing wetland. Phaae II. The applicant proposes the construction ot a vegetated swale for the proposal on an adjacent site (Phase 11). The Applicant proposes the fill of 578 square feet of weGands along the property boundary belween Phase I and Phase II. Mitigation would be provided by the 720 square foot expansion of an exisUng wetland at the southeast comer of the site. The proposal also inGudes a bu}fer reduction for the wetland along the south and east portion of Phase II. Wetland mitigation plans prepared by Logan and Jones inGude a mitigation plan for Phase I received July 17, 1991 and mitigaGon plans for Phase II dated August 29, 1991, December 23, 1991, and June 25, 1992. The miUgatlon plan eluments inGude the following: Phass I- Expansion of wetlands would occur through excavatlng, so that the natural hydrology will suppurt the wetlands species. A suAace blanket of organic soils would be placed. The final excavation would breach the new wetland boundary with the existinp wetland. New weNand areas would be planted with catteils and soft rush. BuHer enhancement is also proposed by dearing, grading and replanting with E%IIIBIL� o�_ oE.28