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4 y .4 CITY OF EVERETT STORMWATER MANAGEMENT MANUAL method for the resulting oily wastewater is implemented. Absorbent material shall not be washed • - of the kit shall be appropriate for the type and quantities of chemical liquids stored at the facility .. • • • .. . •-- ..- . .. ..-. - A7.14 Elimination of Illicit Connections to Storm Drainage System Description of Pollutant Sources: Illicit connections are unpermitted sanitary or process wastewater discharges to a storm drain or to a surface water,rather than to a sanitary sewer,industrial process wastewater or other appropriate treatment. They can also include swimming pool water,filter backwash, cleaning solutions/washwater,cooling water,etc. Experience has shown that illicit connections 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: 1. Eliminate unpermitted wastewater discharges to storm drains,ground water,or surface water; and, 2. Convey unpermitted discharges to a sanitary sewer if allowed by the local sewer authority,or to other approved treatment;and, 3. Obtain appropriate 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: 1. Conduct a field survey of buildings,particularly older buildings,and other industrial areas to locate storm drains from buildings and paved surfaces. Note where these join the public storm drain(s). 2. During non-stormwater conditions inspect each storm drain for non-stormwater discharges. Record the locations of all non-stormwater discharges. Include all permitted discharges. 3. If useful,prepare a map of each area as it is to be surveyed. Show on the map the known location of storm drains,sanitary sewers,and permitted and unpermitted discharges. Aerial photos may be useful. Check records such as piping schematics to identify known side sewer connections and show these on the map. Consider using smoke,dye or chemical analysis tests to detect connections between two conveyance systems(e.g.,process water and stormwater). If desirable, conduct TV inspections of the storm drains and record the footage on videotape. 4. Compare the observed locations of connections with the information on the map and revise the map accordingly. Note suspect connections that are inconsistent with the field survey. 5. Identify all connections to storm drains or to surface water and take the actions specified above as applicable BMPs. Volume IV—Source Control 3-55