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i <br />` Project 113-13 <br /> July 31, 1995 <br /> Page 4 <br /> Table 2 <br /> Cheapen #76, 890 North Main Street, Manteca, California <br /> Groundwater Sample Analysis Results* <br /> Samples Collected on July 27, 1995 <br /> Sample # TPH-g Benzene Toluene Ethylbenzene XXIenes <br /> MW-1 ND < 50ND <0 5 ND <05 ND <05 ND <0 5 <br /> MW-2 ND < 50 ND <0 5 ND <0 5 ND <0 5 ND <05 <br /> MW-3 ND < 50 ND <0 5 ND <0 5 ND <0 5 ND <05 <br /> MW-4 ND < 50 ND <05 ND <0 5 ND <0 5 ND <05 <br /> Sample results are in µg/1 or parts per billion <br /> The California Department of Health Services has established MCLs (Maximum <br /> Contaminant Levels) for benzene, ethylbenzene, and xylenes The U S. EPA has <br /> established primary and secondary levels for BTEX. These are listed below <br /> Table 3 Current Action Levels <br /> Sample TPH-g Benzene Toluene Ethylbenzene Xylenes <br /> DOHS MCL NA 1 NA 680 1,750 <br /> US EPA Primary NA 5 1,000 700 10,000 <br /> US EPA Secondary NA NA 40 - - 30 20 <br /> May, 1993, update TPH and BTEX are in ppb orµg/L. NA = Not Applicable Concentrations above the <br /> action levels are in boldface <br /> IIL Future Directions <br /> The seven previous quarters found all wells to be ND for TPH-g. Following the <br /> groundwater level rise this winter, a trace concentration of benzene was found at <br /> MW-2 in January, 1995 April 1995 analyses yielded trace amounts of toluene, <br /> ethylbenzene, xylenes at MW-4 July 1995 samples were ND again None of the <br /> sporadic trace constituents have approached actionable levels. <br /> Parker Environmental recommends that The Customer Company pursue site <br /> closure with the San Joaquin County Department of Health Services. <br /> 10 <br /> Parker Environmental Services 190 East 7th Street Pittsburg CA 94565-6116 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />