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Mr john Johnson <br /> Project 123-26-03 <br /> March 20, 1999 <br /> Page 4 <br /> transport to a state certified hazardous materials testing laboratory, McCampbell <br /> Analytical of Pacheco, California The samples were analyzed for TPH-g, and BTEX <br /> using EPA Methods 5030, modified 8015, and 8020 or 602 A copy of the laboratory <br /> report and Chain of Custody form are appended to this report <br /> Table 2- Laboratory Analysis Results <br /> Cheaper' store#37, 15 East Grant Line Road, Tracy, California <br /> Groundwater Samples Collected on February 23, 1999 <br /> Sample TPH-g Benzene Toluene Ethylbenzene Xylenes MTBE <br /> MW-1 ND ND ND ND ND ND <br /> MW-2 ND ND ND ND ND 16 <br /> MW-3 ND ND ND ND ND ND <br /> MW-4 270 46 067 65 91 530 <br /> MW-5 ND ND ND ND ND ND <br /> MW-6 ND ND ND ND ND 19 <br /> MW-7 ND ND ND ND ND ND <br /> MW-8 ND ND ND ND ND 61 <br /> Detection Lim 50 05 05 05 05 50 <br /> TPH-g and BTEX are in parts per billion, or pg/L ND=Not Detected <br /> The sample results show detectable amounts of petroleum hydrocarbons and all <br /> BTEX constituents in MW-4, and detectable amounts MTBE in MW-2, MW-4, MW- <br /> 6, and MW-8 <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 February 23, 1999, Sample Results With <br /> Current Action Levels <br /> Sample TPH-g Benzene Toluene Eth lbenzene Xylenes <br /> MW-4 270 46 067 65 91 <br /> DOHS MCL N A 1 N A 680 1,750 <br /> EPA Primary NA 5 1,000 700 10,000 <br /> EPA Secondary NA NA 40 30 20 <br /> TPH and BTEX are in parts per billion or pg/L NA =Not Apphcable Concentrations above the action <br /> levels are in boldface <br /> Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 <br /> Phone (925) 439-1024 Fax (925) 439-2566 <br />