HomeMy WebLinkAbout008_Stormwater Maintenance PlanINSPECTION AND MAINTENANCE FOR STORMWATER MANAGEMENT FACILITIES
The owner shall be responsible for the maintenance of the stormwater drainage facilities within The Nahorniak Commons, located in the Remainder of Tract 6 & 10’ Strip of Tract 7, Film 186, Page 4480. Storm Water Facilities: 1. Retention Ponds collect storm water runoff and store the water until it evaporates and/or infiltrates into the ground. Post Construction Inspection:
1. Observe drain time in retention ponds for a storm event after completion of the facility to confirm that the desired drain time has been obtained. If excessively slow infiltration rates are observed then excavate a minimum 5 ft by 5 ft drain to native gravels (or native well-draining material) and backfill with well-draining material (pit-run). Semi-Annual Inspection:
1. Check for grass clippings, litter, and debris in retention ponds. Flush and/or vacuum storm water pipes if excessive material is observed in the facilities. Standard Maintenance: 1. Inspect for the following issues: differential accumulation of sediment, drain time, signs of
petroleum hydrocarbon contamination (odors, oil sheen in pond water), standing water, trash and debris. 2. Monitor health of vegetation and revegetate as necessary to maintain full vegetative cover. 3. Check retention ponds three days following a storm event exceeding ¼ inch of precipitation. Failure for water to percolate within this time period indicates clogging or poor-draining soils.
Sediment accumulation: In most cases, sediment in a catch basin or a retention system does not contain toxins at levels posing a hazardous concern. However, sediments should be tested for toxicants in compliance with current
disposal requirements and if land uses in the drainage area include commercial or industrial zones, or if visual or olfactory indications of pollution are noticed. Sediments containing high levels of pollutants should be disposed of in accordance with applicable regulations and the potential sources of contamination should be investigated and contamination practices terminated.