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Mr John Johnson Project 113-26-03 August 11, 1999 Page 4 transport to a state certified hazardous materials testing laboratory, McCampbell Analytical of Pacheco, California The samples were analyzed for TPH-g, and BTEX using EPA Methods 5030, modified 8015, and 8020 or 602 The samples were also analyzed for MTBE using EPA method 8260 modified A copy of the laboratory report and Chain of Custody form are appended to this report Table 2 - Laboratory Analysis Results Cheaper) store #37, 15 East Grant Line Road, Tracy, California Groundwater Samples Collected on June 27, 1999 Sample TPH-g Benzene Toluene Ethylbenzene Xylenes MTBE MW-1 ND ND ND ND ND ND MW-2 ND ND ND ND ND 37 MW-3 ND ND ND ND ND ND MW-4 ND 31 ND ND 073 160 MW-5 ND ND ND ND ND ND MW-6 ND ND ND ND ND 22 MW-7 ND ND ND ND ND 12 MW-8 ND ND ND ND ND 20 Detection Lim 50 05 05 05 05 10 TPH-g and BTEX are in parts per billion,or pg/L ND=Not Detected The sample results show detectable amounts of benzene, xylenes, and MTBE in MW-4 All other monitoring wells showed no traces of either hydrocarbons, BTEX, but MW-2. 6, 7, and 8 showed detectable amounts of MTBE The California Department of Health Services has established MCLS (Maximum Contaminant Levels) for benzene, ethylbenzene, and xylenes The U S EPA has established primary and secondary levels for BTEX These are compared with the MW-4 results below Table 3. Comparison of June 27 1999, Sample Results With Current Action Levels Sample TPH-g Benzene Toluene_ Ethylbenzene Xylenes MW-4 ND 3.1 ND ND 073 DOHS MCL N A 1 N A 680 1,750 EPA Primary N A 5 1,000 700 10,000 EPA Secondary N A NA 40 30 20 TPH and BTEX are m parts per billion or pg/L NA= Not Applicable Concentrations above the action levels are in boldface Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 Phone (925) 439-1024 Fax (925) 439-2566