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Bremer Bank – St. Anthony July 20th, 2021 <br /> <br /> <br />3 <br /> <br /> <br />VOLUME CONTROL <br />The City requires the underground stormwater system be capable of handling 1.1 <br />inches of runoff from all impervious surfaces. Table 2 below compares the impervious <br />areas and required volume to the capacity of the StormTech system. <br /> <br />Table 2: Volume Requirement <br />Impervious <br />Area [SF] <br />Required <br />Volume (1.1”) <br />[CF] <br />Volume <br />Provided <br />[CF] <br />27,619 2,531 3,867 <br /> <br />WATER QUALITY <br />The Watershed requires storm water facilities to be designed to provide 60% annual <br />removal of total phosphorus (TP) and 90% annual removal of total suspended solids <br />(TSS). The City has indicated that the water quality treatment provided by sump <br />manholes, isolator rows, and sand filtration will be acceptable. <br /> <br />CONCLUSION <br />The proposed Bremer Bank and its storm water management facilities have been <br />designed to meet the rate control, volume control, and water quality requirements of the <br />City of St. Anthony and the Mississippi Watershed Management Organization.