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2707 Wetmore Avenue <br /> .O`1VI"E <br /> Everett, WA 98209 <br /> ENGINEERING, INC. f t 4425.25.259.13s7.Ss952o <br /> 8 <br /> When equally dividing the on-site impervious surface area accounted for in the Seahurst SP <br /> Drainage Report among the-four lots each lot would be allowed a maximum of 2,923 sf of on- <br /> site impervious surfaces per lot with the driveway installed within the R/W being part of the <br /> 2,900 sf accounted for in the design for the impervious surfaces within the R/W. <br /> For this project the 2,638 sf of proposed impervious surfaces is 285 sf below the maximum <br /> allowed. In addition, the permeable pavement will be used for the on-site driveway as approved <br /> in the design and the roof runoff will be directed to infiltration trenches sized for the 2,168 sf roof <br /> area. <br /> Summary <br /> After reviewing the proposed site plans and comparing the proposed improvements to the <br /> design assumptions approved in the Seahurst SP drainage report, the building permit <br /> improvements proposed for Lot 5 use the same stormwater mitigation BMPs and the areas are <br /> equal to or slightly less than those approved for the short plat. <br /> Sincerely, <br /> Joseph Smeby, P.E. <br /> Project Engineer <br /> —) <br /> r r._ <br /> c?/91. <br />