The City of Blackfoot has many car washes available to citizens to keep their cars clean. It is up to the owners and operators of those facilities to help keep the discharges from these operations clean. Each car wash is required to have a covered wash bay (roof) and an oil and water separator in each bay. These oil and water separators must not be allowed to accumulate sufficient solids to hinder their clarifying performance. When the volume of solids in an oil and water separator exceeds 25%, efficiency begins to decrease significant