PB 22 10 Altera 769 LLC Filed Application with Exhibits Final Site Plan Phase 2

to chemical means of controlling mosquitoes. The most important maintenance function is removal of all obstructions to natural flow patterns before stagnant water conditions can develop. h) Parking Lot Maintenance This management measure involves employing pavement cleaning practices, such as parking lot sweeping on a regular basis, to minimize pollutant export to the stormwater conveyance system/detention basins and eventually the receiving waters. These cleaning practices are designed to remove sediment, debris, and other pollutants from access drive and parking lot surfaces that are a potential source of pollution impacting urban waterways. Mechanical machines that use vacuum assisted dry sweeping to remove particulate matter shall be utilized as these have the ability to remove finer sediment particles. Parking lots and access drives shall be swept/vacuumed at least once a month. The disposal of the swept material must be properly hauled off the site and transferred to an approved disposal site. Other parking lot maintenance features include the use of on-site trash receptacle. These receptacles should be located in strategic areas where the majority of the pedestrian traffic occurs. These receptacles should be emptied daily. The disposal of the solid waste must be properly hauled off the site and transferred to an approved disposal site. i) Observation After Rainfall This management measure involves monitoring the amount of time the detention basin takes to drain to ensure the basin is working properly. The detention basin should drain to the bottom in less than 72 hours. If significant increases or decreases are observed in the drawdown time, a qualified licensed Professional Engineer shall be contacted to evaluate the basin’s bottom surface, subsoil and both groundwater and tailwater elevations to determine what corrective measures may

eer shall be contacted to evaluate the basin’s bottom surface, subsoil and both groundwater and tailwater elevations to determine what corrective measures may need to be implemented. The management measure involves monitoring the amount of time it would normally take to drain the maximum design storm runoff volume below the top of the filter’s sand bed. This normal drain or drawdown time should then be used to evaluate the filter’s actual performance. If significant increases or decreases in the normal drain time are observed, a qualified licensed Professional Engineer shall be contacted to evaluate the filter’s sand bed, underdrain system, and tailwater levels to determine what corrective measures may need to be implemented to maintain the proper functioning of the filter. Altera Development Company, LLC -7- Revised August 2022 DECPC #2530-99-006