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MA <br /> Working To Restore Nature <br /> Addendum One to Remedial Action Plan March 1, 1993 <br /> Coca-Cola Former Distribution Facility, Stockton, California 54006.01 <br /> ' As of December 1992, seven quarters of groundwater monitoring have been conducted. The <br /> cumulative results of laboratory analyses of groundwater samples are reported in Table A-3. <br /> In California, TPHg and TPHd in groundwater are regulated indirectly through the <br /> petroleum hydrocarbon constituents, benzene, toluene, ethylbenzene, and total xylenes. <br /> Toluene, ethylbenzene, and total xylenes have been within State and Federal MCLS for all <br /> quarters in all six wells, and ranged from nondetectable to 3.1 ppb. Benzene has been <br /> within the MCL (of 1 ppb) in MW-4 and MW-6 for all quarters. In MW-1 benzene <br /> concentrations have ranged from nondetectable to 40 ppb; in MW-2 from nondetectable to <br /> 7.9 ppb; in MW-3 from nondetectable to 3.9 ppb; and in MW-5 from nondetectable to 3 0 <br /> ppb as seen in Table A-3. State and Federal regulatory limits are reported at the bottom <br /> of Table A-3. A soil cleanup may be adequate to bring benzene concentrations within the <br />' MCL on a long term basis, since at present benzene concentrations are fluctuating around <br /> the MCL value Lead concentrations have been within the MCL in all wells, with the <br /> exception of well MW-2 in March 1991, when lead was reported at 68 ppb The MCL for <br /> 1 lead is 50 ppb <br /> i <br />' A-5 <br />