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.� ' Architecture <br /> Engineering An Employee-Owned Company <br /> Environ menta I Stormwater Management Report <br /> .� Land Surveying <br /> Companies <br /> A bioretention system was utilized for this project for purpose of conveying and treating <br /> stormwater, meeting the volume reduction requirements, and still maintain the existing drainage <br /> patterns. The proposed system is in conformance with the San Joaquin SWQCCP specifications. <br /> The depth of the ponding zone will be 1.0 ft, depth of planting media layer will be 1.5 ft, and <br /> depth of gravel zone will be 2.0 ft. The volume reduction received from the bioretention system <br /> is calculated using the following equation: <br /> Vreduction= (DPz x APz x 0.25) + (DPM x APM x 0.1) + (DGz x AGz x 0.3) <br /> Where, <br /> DPz= Depth of Ponding Zone= 1.0 ft <br /> APz= Area of Ponding Zone= 32,566 ft2 <br /> Dpm= Depth of Planting Media Layer= 1.5 ft <br /> Apm Area of Planting Media Layer= 3 2,5 66 ft2 <br /> DGz= Depth of Gravel Zone= 2.0 ft <br /> AGz= Area of Gravel Zone= 32,566 ft2 <br /> The resulting volume reduction is shown below on Table 3. <br /> Table 3 —Summary of Volume Reduction <br /> Control Measure Volume Reduction (ft3) <br /> Bioretention Basin 32,566 <br /> Total Volume Reduction 32,566 <br /> Provided <br /> Total Volume Reduction 9,670 <br /> Required <br /> Volume Reduction -22,896 <br /> Remaining <br /> 220 Norwood Park South,Suite 201 • Norwood,MA 02062 • T(781)619-9500 • F(203)630-2615• www.blcompanies.com <br /> 6 <br />