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INFORMATION SHEET -2- <br /> SETTLING DRY CLEANING DEFENDANTS <br /> LINCOLN VILLAGE CENTER GROUNDWATER TREATMENT SYSTEM <br /> SAN JOAQUIN COUNTY <br /> Routine effluent monitoring, following onset of full scale operation, will be conducted <br /> monthly. The treatment technologies are not normally subject to sudden upset or bypass, so <br /> rapid changes in effluent concentrations are not expected. If detectable concentrations of <br /> BTEX or VOC constituents are found, the monitoring program requires weekly monitoring <br /> of the effluent until `non-detected' conditions are reestablished. The effluent monitoring is <br /> not a substitute for process control monitoring by the Discharger. <br /> b) A daily maximum effluent limitation is set to allow for some effluent quality variation and <br /> for the false positive analytical results in analyses near the limits of detection. The daily <br /> maximum limits for total VOCs and total BTEX compounds have been set at 1 in any single <br /> sample. For TPF, the daily maximum has been set at the taste and odor threshold of <br /> approximately 0.1 mg/l. The daily maximum for lead is set at 50 µg/1, the MCL for that <br /> constituent. Dilution available in the storm drain and receiving water is expected to provide <br /> adequate dilution to prevent any exceedance of a receiving water standard for volatile <br /> organic constituents and other compounds. <br /> Other constituents reported to be present in the untreated groundwater at trace concentrations, <br /> below Maximum Contaminant Levels or National Toxic Rule standards, are not considered to be <br /> significant in comparison with those constituents listed above. The proposed wastewater <br /> treatment technology to be used for compliance with the effluent limitations for the significant <br /> sources of VOCs in this permit is expected to also result in non-detectable concentrations for the <br /> trace concentrations of VOCs. <br /> Three species chronic toxicity testing on a sample of 100% effluent is required annually to <br /> screen for any toxicity. The monitoring is required as specified in EPA 600/4-91-002. If the <br /> screening shows any toxicity, the Discharger is required to retest, using a dilution series <br /> specified in the monitoring and reporting program. If the testing indicates that the discharge <br /> causes, has the reasonable potential to cause, or contribute to an in-stream excursion above the <br /> water quality objective for toxicity, the Discharger is required to submit a work plan to conduct <br /> a Toxicity Reduction Evaluation (TRE) and, upon approval, conduct the TRE. This Order may <br /> be reopened and a chronic toxicity limitation included and/or a limitation for the specific <br /> toxicant identified in the TRE included. <br /> 4/23/98/KHC:Isb <br />