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

15. the inflow and outflow during a normal rainfall year relativa to existing and post construction conditions must be provided. Prior to application for building pertnits and plan review by the Public Worlcs Department, a characterization of the hydrology of the wetlands on or adjacent to this project that may be affected by the development of this site must be reviewed and approved by the Planning Department. (SEPA Water and Plant and Animal Policies) The drainage plan must include a pipe or swale to convey lake overflows and discharge it at the naturally occurting location. (SEPA Water Policies) 18. All stortnwater runoH from the paved areas of the site must be routed through either a baffie-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 quality enhancing facilities must be designed in accordance with Ciry Standards, constructed in conjunction with Phase I development, and should be sized for all anticipated future stortnwater runoH from both phases of the project. When a vegetated swale is provided for water quality enhancement of stortn water, a minimum of 10 feet of essentially flat ground must be provided between the swale and any adjacent buildings, unless otherwise approved by the Fire Marshal. The required vegetated swales or wetpond must be provided outside of wetlands, streams, and their buffers. The swales or weq>ond must be shown on the required landscaping plan, as well as on Public Works dra!nage plans. (SEPA Plant and Animal and Water Policies) 17. Wetland Mitiaation Proposal Phase I. The proposal includes the fill of .204 acre ol wetland on Phase I. Mitigation would be provided by the .14 acre expansion of an existing wetiand, the enhancement of a wetland buffer, arid the enhancement and rehabilitation of the northem finger of an existing weUand. Phase II. The applicant proposes th,e construction of a vegetated swale for the proposal on an adjacent site (Phasr� II). The Applicant proposes the fill of 576 square feet of wetlands along thri property boundary between Phase I and Phase II. Mitigallon would be prov�ded by the 720 square foot expansion of an existing wetland at the southeast comer of the site. The proposal also inGudes a buffer reduction for thE� wetland along the south and east portion of Phase II. Wetland mitigation plans prepared by Logan and Jones include a mitigation plan for Phase I received July 17, 1991 and mitigation plans for Phase II dated August 29, 1991, December 23, 1991, and June 25, 1992. The mitigation plan elements include the following: Phase I- Expansion of wedands would occur through excavating, so that the natural hydrology will support the wetlands species. A suAace blanket of organic soils would be placed. The final excavation would breach the new wetland boundary with the existing wetland. New weHand areas would be planted with cattails and sok rush. BuHer enhancement is also proposed by ciearing, grading and replanting with