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9610 19th Avenue SE <br /> July 27, 2012 <br /> Revised September 18, 2012 <br /> Page 6 <br /> 9.) Limiting the effective impervious area of the site. <br /> The footprint of the impervious area has been minimized while still maintaining <br /> required access to the building as well as fire marshal requirements. <br /> 10.)Orienting on-site structures and impervious areas to facilitate sheet flow of <br /> stormwater runoff into vegetated open spaces or bioretention areas. <br /> The required site layout does not accommodate vegetated open spaces or open <br /> bioretention areas. <br /> 11.)Directing rooftop runoff to infiltration areas, bioretention areas, or full dispersion <br /> systems to evaporate and transpire stormwater. <br /> Rooftop runoff is directed to the detention system located on the west side of the <br /> site. <br /> 12.)Minimizing impervious surfaces by reducing building footprints, road length and <br /> width, parking areas, and driveways. <br /> The current site plan layout respects minimum road widths, fire department access <br /> loading and unloading areas and driveways. <br /> 13.)Utilizing pervious paving surfaces such as porous pavement for roads, driveways, <br /> parking lots, or other types of drivewable or walkable coverage. <br /> This project investigated the use of pervious paving surfaces but, due to the fact <br /> that many of the slopes exceed 2-percent, elected to use traditional pavement. <br /> Ph: (206)403-0933, emait:jayd@deckerce.com <br />