11102 EVERGREEN WAY 2018-01-01 MF Import

r-� runoff from paved areas wi11 be required. Infiltration of the runoff from the 2 year, 24 hour storm, a wetpond, or a baffle-type oil/water separator in sertes with a vegetated swale will be required. These facilities must be designed and constructed per City standards. If infiltration is chosen, tne applicant should contact me regarding current infiltration system design and construction techniques. - The paved surface resulting from construction of the credit union site and that portion of the access drive necessary for access to the credit union site is qreater than 10,000 s4uare feet. Therefore, under City standards, water quality enhancement of atormwater runoff from the sit.e is required. The applicant cannot avoid treating atormwater + runoff by treating the two areas separately. Runoff from the site must be discharged at the naturally occurring discharge location. This Zocation appesrs 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. - The plans propose to collect the runoff from the credit union portion of the site and convey it to Evergreen Way, contrary to the natural drainaqe pattern of the site. This proposal violates City standards. Stormwater detention and water quality enhancement facilities must be designed and constructed to treat stormwater runoff from all impervious surfaces created in conjunction with this project. 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, etc. - The appli.cant needs to consult the City of Everett Design and Construction Standards and Specifications, section 4, for design requirements and details for stormwater detention/retention and water quality enhancement facilities.