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• <br />INFORMATION SHEET <br />GENERAL ORDER FOR DISCHARGE OF <br />GROUND 'WATER FROM CLEANUP OF <br />PETROLEUM FUEL POLLUTION <br />TO SURFACE WATERS <br />r <br />Y•a <br />would occur with an 'average' or 'mean' limit. The 30 -Day Median <br />Concentration for Lead is established at 5 4/1, one-tenth the MCL for <br />Lead. <br />Routine effluent sampling would be conducted monthly. The treatment <br />technologies utilized for ground water cleanup of fuel constituents are <br />not normally subject to sudden upset or bypass, so rapid changes in <br />effluent quality are not expected. If detectable concentrations of fuel <br />constituents are found, the monitoring program requires weekly monitoring <br />of the effluent until 'non-detected' conditions are reestablished. The <br />effluent sampling is not a substitute for process control monitoring by <br />the Discharger. <br />b. Daily maximum effluent concentrations are established to allow for some <br />effluent quality variation and for the false positive analytical results <br />inherent in analyses near the limits of detection. For Benzene, Ethyl <br />Benzene, Toluene, and Xylene, the Daily Maximum Effluent Limitation has <br />been set at ten times the detection limit. For TPH, the Daily Maximum has <br />been set at the taste and odor threshold of approximately 0.1 mg/l. The <br />Daily Maximum for lead is set at 50 pg/l, the primary drinking water <br />standard for lead. <br />The flow of wastewater from the ground water treatment systems to be covered by <br />this Order are generally less than 50 gpm (72,000 gpd). For the purposes of this <br />Order, discharges less than 100,000 gallons per day will be considered to be low <br />volume dischargers and will not need characterization for the constituents <br />contained in Tables 1 and 2 of the Inlands Surface Water Plan. Discharges in <br />excess of 100,000 gpd will not be covered by this Order. <br />An NPDES Application Forms (1 and 2D), a Report of Waste Discharge and filing fee <br />will be submitted by each proposed. Discharger, providing information on the <br />discharge as detailed in Attachment A. If the Executive Officer finds that the <br />proposed discharge qualifies for coverage under this General Order, the <br />Discharger shall be issued a Notification of Applicability statement. <br />JBM/jbms <br />