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LDC <br /> THE CIVIL ENGINEERING GROUP <br /> Memo <br /> Commercial <br /> a9 <br /> infrastructure <br /> To: City of Everett Residential I <br /> From: Dan Carmody, P.E. <br /> CC: HPD Investments, LLC <br /> John Mirante <br /> Date: October 17, 2013 <br /> Re: HPD Investment Site <br /> 0 <br /> Based on the City's comments on the Targeted Storm Drainage Report prepared for the HPD a <br /> Investment Site in Everett, WA, and dated October 10, 2013, the project must address the o <br /> City of Everett's Public Works Director Interim Policy#2-11, "Stormwater Control in the <br /> Combined Sewer Area" (Policy). The Policy primarily modifies the minimum requirements of <br /> the City's 2010 Stormwater Management Manual to require modeling of the existing conditions <br /> as the actual existing site conditions, not a forested land cover. <br /> Since the existing site is nearly completely impervious in the existing condition, flows from <br /> the additional 2,200 sf of impervious area will be negligible. The flows may increase from <br /> this site by approximately 3% on average due to the increase in impervious area. Any flow <br /> increase will be attenuated via the approximately 450 foot flow path to the nearest catch <br /> basin. Therefore, there is not anticipated to be any increase in combined sewer overflows or <br /> impact to basement flooding in the combined sewer area. <br /> 4303 <br /> o, <br /> LciL <br /> C1. <br /> N <br /> 67 <br /> 67 <br /> in <br /> L <br /> O <br /> N <br /> ct1 <br /> V' <br /> Engineering ABOVE the Standard <br />