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1 <br /> fls �P. <br /> SECTION 7.0 <br /> PROPOSED CLEANUP LEVELS <br /> Since no receptors have been identified, site specific risk based cleanup levels were not derived <br /> A conservative approach for determining cleanup levels is to meet drinking water standards for <br /> the BTEX compounds. Federal pnmary maximum contaminant levels (MCLs) and California <br /> 1 maximum contaminant levels (MCLS) are two possible cleanup levels that would conservatively <br /> preserve the effected aquifer as a potential drinking water source. MCLS and maximum <br /> contaminant concentrations detected during the December 1997 sampling events are presented <br /> in Table 10 <br /> Table 10 <br /> MCLS and Maximum Detected Concentrations <br /> California <br /> Dnnking Water Recent Maximum <br /> Standards Federal Detected Concentration <br /> Contaminant MCL (µg/1) MCL (µg/1) W/1) <br /> Benzene 1 5 1,500 (MW-2) <br /> 200 (MW-2A) <br /> Toluene 150 2,000 17 <br /> Ethylbenzene 700 700 1,100 (MW-2) <br /> 160 (MW-2A) <br /> Total Xylenes 1,750 10,000 1,000 <br /> If the California Dnnkin Water Standards are adopted, the maximum detected levels of toluene <br /> g <br />' ethylbenzene, and total xylenes are very nearly in compliance <br /> 1 <br /> L%PR0JECrSZAN10Q%HSAIAM0NPL 42 <br />