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Project 113-13 <br /> April 26, 1995 <br /> Page 4 <br /> Table 2 <br /> Cheaper! #76, 890 North Main $treet, Manteca, California <br /> Groundwater Sample Analysis Results* <br /> Samples Collected on April 18, 1995 <br /> .Sample # TPH Benzene Toluene Eth Ibenzene Xylenes <br /> MW-1 ND < 50 ND <0.5 ND <0.5 ND <0.5 ND <0.5 <br /> MW-2 ND < 50 ND <0.5 ND <0 5 ND <0.5 ND <0.5 <br /> MW-3 ND < 50 ND <0.5 ND <0.5 ND <0-5 ND <0 5 <br /> MW-4 ND < 50 ND <0.5 0.64 0.58 39 <br /> Sample results are in µg/l 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 compared with the <br /> MW-4 results below. <br /> Table 3: Comparison of April 18, 1995 Sample Results With <br /> Current Action Levels <br /> Sample TPH-g Benzene Toluene Ethylbenzene Xylenes <br /> MW-4 ND<50 ND<0 5 0.64 0.58 39 <br /> DOHS MCL NA 1 N A 680 1,750 <br /> US EPA Primary NA 5 1,000 700 10,000 <br /> US EPA Secondary NA N A 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. None of the trace constituents have approached <br /> actionable levels. <br /> Parker Environmental recommends that The Customer Company pursue site <br /> closure with the San Joaquin County Department of Health Services. <br /> Parker Environmental Services 190 East 7th Street Pittsburg CA 94565-6116 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />