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STORMWATER DATA <br /> Project Name: RITEAID#5231 -EVERETT By: P.A.D. <br /> Project Number: 08028 Date: 9/11/2008 <br /> DRAINAGE CRITERIA: City of Everett Storm Code <br /> RAINFALL METHOD: SBUH method <br /> Step 1)Site Data <br /> 1) General characteristics: <br /> Basin A Soil type silty sand <br /> Development type commercial Soil Group C <br /> Size(ac.) 2.01 Existing surface bldg, paving, landscape <br /> Location Everett Sensitive areas no <br /> Detention/Retention None bypass flows no <br /> 2) Existing onsite characteristics: <br /> Pervious acres 0.08 acres <br /> landscape 0.08 acres <br /> Impervious acres 1.93 acres <br /> roof 0.00 acres <br /> pavement 1.93 acres <br /> gravel(built after 1979) 0.00 acres <br /> 3) Developed onsite characteristics: <br /> Pervious acres 0.58 acres <br /> landscape 0.58 acres <br /> Impervious acres: 1.43 acres <br /> roof 0.40 acres <br /> paving 1.03 acres <br /> Time of concentration: USE 6.0 MINUTES <br /> Step 2) Developed stormwater discharge criteria <br /> Since the existing site is almost entirely impervious and the redevelopment will result in a decrease in <br /> total impervious area, flow control measures are not required. Water quality treatment will be required. <br /> 5 <br />