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A. DRAINAGE INFORMATION SUMMARY FORM <br /> Project: Seahurst SP <br /> Permit#: PW1906-021 <br /> Engineer: Omega Engineering,Inc.2707 Wetmore Avenue Total site area: 0.86 acres <br /> Everett, WA 98201 Offsite area: 0.07 acres <br /> Attention: Joseph Smeby, P.E. 'Disturbed area: 0.55 acres <br /> New Lots: 6 <br /> Applicant: NW Homefinders, Inc <br /> Attn: Rod Koon <br /> 781 16t' Pl <br /> Mukilteo, WA 98275 <br /> This project has two threshold discharge areas (Basin 'A' and Basin `B'). Approximately <br /> 800 sf of sidewalk will be added,to Basin 'A' and approximately 13,531 sf of future roof, <br /> driveway and sidewalk will be added to Basin`B'. <br /> Drainage Basin Information Basin A <br /> On-site Developed Area 0 acres <br /> Off-site Improved Area 0.02 acres <br /> Soil Types in area of Storage Type C Soils <br /> Basin Data <br /> Pre-developed run-off rates: 2-year 0.000 cfs <br /> 10-year 0.001 cfs <br /> 50-year 0.001 cfs <br /> 100-year 0.001 cfs <br /> Post-developed run-off rates: 2-year 0.010 cfs <br /> 10-year 0.017 cfs <br /> 50-year 0.023 cfs <br /> 100-year 0.026 cfs <br /> Drainage Basin Information Basin B <br /> On-site Developed Area 0.48 acres <br /> Off-site Improved Area 0.05 acres <br /> Types of storage proposed on site Various Infiltration <br /> • Approximate total storage volume -Varies <br /> • <br /> Soil Types in area of Storage Type C Soils <br /> Basin Data <br /> Pre-developed run-off rates: 2-year 0.01 cfs <br /> 10-year 0.02 cfs <br /> 50-year 0.03 cfs <br /> 100-year 0.04 cfs <br /> Post-developed run-off rates: 2-year 0.04 cfs <br /> 10-year 0.09 cfs <br /> 50-year 0.15 cfs <br /> 100-year 0.17 cfs <br /> ° 18-0727`Seahurst"SP Page 4 <br /> September 2019 <br />