... regularly inspect and maintain storm water management devices, such as cleaning oil /water separators, catch basins, and diversion swales. You must also regularly inspect, test, maintain, and repair ... the storm or as soon as there is adequate flow at the sampling location. Accurate storm water sampling information requires a rain gauge (from any hardware store) mounted in a place such as ... contami-nation of soil, groundwater, or storm water with potentially hazardous waste. Parts washing and steam-cleaning discharges are unauthorized non -storm water discharges that must be eliminated....