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Mr.john Johnson <br /> Project 113-26-03,April 20, 1995 <br /> Page 4 <br /> After each well was purged, a sample was taken using a teflon bailer. The sample <br />• water was placed in two 40-milliliter vials filled so that there was no air (head space) <br /> remaining in the vials Samples were labeled and placed on ice in a cooler for <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 Chani 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 March 15, 1995 <br /> Sample TPHI . Benzene Toluene Ethylbenzene Xylenes .! <br /> MW-1 88 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 22,000 4,100 570 400 2,600 <br /> TPH-g and BTEX are to 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 of TPH-g in MW-1. <br /> Contaminant levels in MW-4 have increased significantly since December, 1994 (see <br /> Table 1) <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 March 15, 1995, Sample Results With <br /> Current Action Levels <br /> Sample TPH.a Benzene Toluene Ethylbenzene Xylenes <br /> MW-4 22,000 4,100 570 400 21600 <br /> DOHS MCL NA 1 NA 680 11750 <br /> EPA Pnmary NA 5 1,000 700 10,000 <br /> EPA Secondary NA NA 40 30 20 <br /> TPH and BTEX are m parts per billion or pg/L NA = Not Apphcable Concentrations above the achon <br /> levels are in boldface <br /> HL Conclusions and Recommendations <br /> Future remediation and investigation efforts will be addressed when the last quarter <br /> of this year's quarterly monitoring is completed <br /> Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />