2026 05 Operations and Management Manual rcd 5 6 2026

maintenance program, the basins are designed to completely drain within 72 hours after each rain event. This aids in the goal of preventing stagnate pools of water, resulting in the elimination of potential mosquito breeding habits. c) 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/basin and downstream of the basin discharge. 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. d) Observation After Rainfall: This management measure involves monitoring the amount of time the basin takes to drain to ensure it is working properly. The basin should drain in less than 72 hours after each rain event. 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 need to be implemented. 2. Corrective Maintenance Procedures: a) Removal of Debris and Sediment: Sediment, debris, and trash that threaten the discharge capacity of the basin should be removed immediately with the use of light-weight equipment to avoid soil compaction and properly disposed of. As noted previously, it is recommended that all water be evacuated from the basin with a pump before any significant amount of sediment, settled debris, or trash is removed from the basin. The lack of an available disposal site should not delay the removal of trash, debris, and sediment. Temporary disposal sites should be utilized if

, or trash is removed from the basin. The lack of an available disposal site should not delay the removal of trash, debris, and sediment. Temporary disposal sites should be utilized if necessary. b) Structural Repairs: Structural damage to outlet and inlet structures, trash racks, access hatches, roadways and walls as a result of vandalism, flood events, settlement, or other causes must be repaired promptly. The urgency of the repairs will depend upon the nature of the damage and its effects on the safety and operation of the facility. The analysis of Mavis Tire Supply, LLC May 2026 DEC# 1956-24-04187 5