SITE INFORMATION AND CORRESPONDENCE_1998-2000

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WASTE DISCHARGE REQUIREMENTS • 2_ SETTLING DRY CLEANING DEFENDANTS LINCOLN VILLAGE CENTER GROUNDWATER TREATMENT SYSTEM SAN JOAQUIN COUNTY ether(MTBE) or other oxygenate compounds may become present in water pumped from extraction wells due to two fuel contamination sites which are also present at the Lincoln . Center. The proposed treatment plant is expected to treat the volatile organic compounds to non-detectable levels. It is currently unknown if the treatment plant will effectively remove oxygenate compounds. This Order requires a treatment performance evaluation to show the effluent limitations can be met, and also ongoing monitoring for constituents of concern. 4. The applicable water quality criteria and objectives which are the most stringent, and which were considered in this permit for constituents of concern are as follows: Constituent Level Units Consideration PCE 0.8 µg/1 NTR TCE 2.7 µg/1 NTR DCE 6.0 WA MCL Methylene Chloride 5.0 WA MCL 1,2-DCA 0.38 µg/1 NTR Benzene 1.0 µg/1 MCL Toluene 150 WA MCL Xylene 1750 µg/1 MCL Ethyl benzene 700 µg/1 MCL Lead (total) 50 µg/1 MCL MTBE 35 PO Action Level MCL=State of California Drinking Water Standards Maximum Contaminant Level NTR=U.S. Environmental Protection Agency,National Toxics Rule Standard Action Level=State of California Drinking Water Action Level 5. Other VOCs reported to be present in the untreated groundwater at trace concentrations, below MCLs or NTR standards, are not considered to be significant in comparison with those constituents listed in 4, above. The proposed wastewater treatment technology is capable of dependably removing these constituents to concentrations which are generally non-detectable using EPA Method 600 series analyses. Compliance with the effluent limitations for the significant sources of VOCs in this permit is expected to also result in non-detectable concentrations for the trace concentrations of VOCs.