11102 EVERGREEN WAY 2018-01-01 MF Import

MEMORAND[JM TO: Gordon Witcher FROM: Jane Zimmerman DATE: February 22, 1993 SUBJErT: Washington Credit Union Plan Review The departments of Fish and Wildlife must be contacted by the applicant to determine whether or not an Hydraulic Projec:t Ap�reval (HPA) is required for this site due to its location w:ithin the Swamp Creek drainage basin. A copy of � � the HPA, or. a letter stating that an HPA is not required, must be submitted with the next set of plans for review. All wetland areas on the site must be identified on the plans. Appropriate buffers must be assigned and shown. Steve Stanley of the Planning Department needs to verify the presence or absence of wetlands on the site. It does not appear ae though the access road has been taken into account with regard to detention calculations for this site. Any changes in land cover made in conjunction with this project must be accounted for in detention calculations and an appropriate detention system must be designed to detain all stormwater runoff from altered areas. If the total amount of paved surface created in conjunction with this site, including the access road, is greater than or equal to i0,000 square feet, treatment of stormwater runoff from paved areas will be required. Infiltration of the runoff from the 2 year, 24 hour storm, a wetpond, or a baffle-type oil/water separator in series with a vegetated swale will be required. These facilities must be designed and constructed per City standards. If infiltration is chosen, the applicant should contact me regarding current infiltration system design and construction techniques. Runoff from the site must be discharged at the naturally occurring discharge location. This location appears to be to the southwest portion of the site, into the area designated as existing drainage flow, just north of 112th and along the western side of the access road. A drainage system for the access drive does not appear to have been provided. If the swale, located along its north and west sides, is the drainage system, much more detail � must be given, regarding its slope, cross-section, planting, eta.