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Goldfinch Brothers <br /> Drainage Study <br /> August 27,2008 <br /> 1. DRAINAGE INFORMATION SUMMARY FORM <br /> Project Name: Goldfinch Brothers,Inc. <br /> Project Engineer: J.C.McDonnell,PE. <br /> Project Applicant: Goldfinch Properties,LLC <br /> P.O Box 5126, <br /> Everett,WA 98206 <br /> Project Total Area: 2.04 Acres <br /> Project Development Area: 1.2 Acre Number of Lots: 1 <br /> Summary Table 1 <br /> Drainage Basin Information Individual Basin Designation <br /> A B C D <br /> On-site Development Area 1.2 ac <br /> Type of Storage Proposed Detention <br /> Vault <br /> Approximate Storage Volume 8,320 cu. Ft. <br /> Soil types Alderwood <br /> Type C <br /> Pre-developed Runoff Rate <br /> Q (cfs) 2 year 0.027 <br /> 10 year 0.071 <br /> 100 year 0.163 <br /> Post-developed Runoff Rate <br /> Before/after controlling <br /> Q (cfs) 2 year 0.33/0.015 <br /> 10 year 0.51/0.08 <br /> 100 year 0.75/0.156 <br /> Proposed Water Quality 6-month <br /> Treatment 0.009/0.192 <br /> I <br /> I 3 <br />