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impervious surfaces associated with the project are classified as disturbed impervious areas, and no Runoff Reduction Volume (RRv) is required. The total required Water Quality Volume (WQv) for the development is 46,210 cubic feet (1.061 ac-ft). This required treatment volume is fully provided by the proposed wet pond, which has been designed to treat stormwater runoff from the site under full buildout conditions. Therefore, the proposed stormwater management system satisfies the NYSDEC water quality treatment and runoff reduction requirements for the development. Channel Protection: The NYSDEC requires that 24-Hour extended detention be provided for the proposed 1-year storm event. A volume of 99,248 cf is accommodated in the Wet Pond at elevation 609.62. The existing runoff flow rate is 103.89 cfs. The proposed runoff is 38.71 cfs. The flow rate has decreased by 65.18 cfs. Overbank Flooding: The NYSDEC requires that the 10-year proposed storm event be attenuated with detention and that the outlet be restricted to the 10-year existing storm event. A volume of 185,425 cf is accommodated in the Wet Pond at elevation 610.89. The existing runoff flow rate is 184.66 cfs. The proposed runoff is 87.97 cfs. The flow rate has decreased by 96.69 cfs. Extreme Storm Protection: The NYSDEC requires that the 100-year proposed storm event be attenuated with detention and that the outlet be restricted to the 100-year existing storm event. A volume of 283,293 cf is accommodated in the Wet Pond at elevation 612.22. The existing runoff flow rate is 317.14 cfs. The proposed runoff is 141.36 cfs. The flow rate has decreased by 175.78 cfs. Refer to the engineer’s report for storm sewer design criteria, runoff summary tables and stormwater drainage calculations. 113 OTHER CONTROLS 113.1 OFF-SITE VEHICLE TRACKING A stabilized construction exit will be provided to help reduce vehicle tracking of sediments. Existing paved areas will remain as long as possible and will be used for vehicle wash areas and to further aid in the reduction of vehicle tracking of sediments. The paved streets adjacent to the site entrance shall be inspected daily and swept as necessary to remove any excess mud, dirt, or rock tracked from the site. Dump trucks hauling material to/from the construction site will be covered with a tarpaulin. The job site superintendent will be responsible for seeing that these procedures are followed. 113.2 EXCAVATION SPOIL MATERIALS Excavation spoil materials are generated during the excavation of the development’s building and utilities installation. These materials must be properly managed to prevent them from contributing to storm water discharges. The materials generated from the development of this project will be hauled off-site or stockpiled for re-use in designated areas which will have temporary erosion & sediment control measures installed. Any removal from site will be done under the necessary permits required by the local governing agencies. West Seneca Exchange 07/20/2026 Page 14 of 24 Page 835 of 1174