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SOUNDVIEW TECHNOLOGY CENTER EVERETT, WA <br /> BASIN C <br /> Existing Basin <br /> Name ext C-4 <br /> Bypass: No <br /> Groundwater: No <br /> Pervious Land Use acre <br /> C, Forest, Steep 6.26 <br /> Pervious Total 6.26 <br /> Impervious Land Use acre <br /> Impervious Total 0 <br /> Basin Total 6.26 <br /> Developed Basin <br /> Vault#4 <br /> Name dev C-upper area <br /> Bypass: No <br /> Groundwater: No <br /> Pervious Land Use acre <br /> C, Lawn, Flat 0.91 <br /> Pervious Total 0.91 <br /> Impervious Land Use acre <br /> ROADS MOD 4.52 <br /> ROOF TOPS FLAT 0.47 <br /> SIDEWALKS FLAT 0.36 <br /> Impervious Total 5.35 <br /> Basin Total 6.26 <br /> Name Vault 4 <br /> Width 22 ft. <br /> Length 296 ft. <br /> Depth: 16 ft. <br /> Discharge Structure <br /> Riser Height: 15 ft. <br /> Riser Diameter: 12 in. <br /> Orifice 1 Diameter: 0.77 in. Elevation: 0 ft. <br /> Orifice 2 Diameter: 1.29 in. Elevation: 10.9 ft. <br /> Orifice 3 Diameter: 0.79 in. Elevation: 12.15 ft. <br /> Stream Protection Duration <br /> POC #1 <br /> The Facility PASSED <br /> The Facility PASSED. <br /> As can be seen in the WWHM output, modeled vault with dimensions of 22' x 168' x 15.0' (vault#4) meets <br /> and exceeds the detention requirements for Basin C. <br /> SEPTEMBER 23, 2022 STORMWATER DRAINAGE REPORT PAGE 26 <br />