7800 EVERGREEN WAY HYUNDAI O&M Manual 2025-04-28

IV-1 Source Control BMPs Applicable to All Sites S410 BMPs for Correcting Illicit Discharges to Storm Drains Description of Pollutant Sources: Illicit discharges are unpermitted sanitary or process wastewa- ter discharges to a storm sewer or to surface water, rather than to a sanitary sewer, industrial pro- cess wastewater, or other appropriate treatment. They can also include swimming pool water, filter backwash, cleaning solutions/washwaters, cooling water, etc. Experience has shown that illicit dis- charges are common, particularly in older buildings. Pollutant Control Approach: Identify and eliminate unpermitted discharges or obtain an NPDES permit, where necessary, particularly at industrial and commercial facilities. Applicable Operational BMPs: ▪ For all real properties, responsible parties must examine their plumbing systems to identify any potential illicit discharges. Review site plans, engineering drawings, or other sources of information for the plumbing systems on the property. . If an illicit discharge is suspected, trace the source using an appropriate method such as visual reconnaissance, smoke test,flow test, dye test with a nontoxic dye, or closed circuit television (CCTV)inspection. These tests are to be performed by qualified personnel such as a plumb- ing contractor. Note: Contact Ecology prior to performing a dye test which may result in a dis- charge to a receiving water. . If illicit connections are found, permanently plug or disconnect the connections. . Eliminate prohibited discharges to storm sewer, ground water, or surface water. . Convey unpermitted discharges to a sanitary sewer if allowed by the local sewer authority, or to other approved treatment. . Obtain all necessary permits for altering or repairing side sewers and plumbing fixtures. Restrictions on certain types of discharges, particularly industrial process waters, may require pretreatment of discharges before they enter the sanitary sewer. It is the responsibility of the property owner or business operator to obtain the necessary permits and to replace the con- nection. . Obtain appropriate state and local permits for these discharges. Recommended Additional Operational BMPs: At commercial and industrial facilities, conduct a survey of wastewater discharge connections to storm drains and to surface water as follows: 2019 Stormwater Management Manual for Western Washington Volume IV-Chapter 1 -Page 497