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Mr.John Johnson Project 113-26-03,January 11,1995 Page 3 Groundwater elevation was about 0.6 feet higher than in September, 1994. . Groundwater flow was to the northeast, with a gradhent of about 0.0013 (1.3 feet per 1,000 feet). Each monitoring well was purged using an electric submersible pump prior to sampling At least 12 gallons were removed from each well, more than three well volumes per well. Water levels after purging showed no significant change prior to sampling. All purge water was placed in a sealed metal drum. Before the next well was purged and sampled, the pump was run in one bucket with detergent and two separate buckets with tap water. All purge water and equipment wash water was placed in DOT 17H 55-gallon steel drums and remains on-site The water and drums will be disposed on your authorization with documentation forwarded upon completion. After each well was purged, a sample was taken using a teflon bailer. The sample water was placed in two 40-milliliter vials filled so that there was no air (head space) remaining in the vials. Samples were labeled and placed on ice in a cooler for transport to a state certified hazardous materials testing laboratory, McCampbell Analytical of Pacheco, California. The samples were analyzed for TPH-gasoline, and BTEX using EPA Methods 5030, modified 8015, and 8020 or 602. A copy of the laboratory report and Chain of Custody form are appended to this report. • Table 2 - Laboratory Analysis Results Cheaperl Store #37 15 East Grant Line Road, Tracy, California Groundwater Samples Collected on December 22, 1994 Sample TPH Benzene Toluene Eth lbenzene Xylenes MW-1 140 ND<0.5 ND<0 5 ND<0 5 0.83 MW-2 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 MW-3 ND<50 ND<0.5 ND<0.5 ND<0.5 ND<0.5 MW-4 3,700 570 92 58 470 TPH-g and BTEX are in parts per billion,orµg/L. ND= Not Detected The sample results show detectable amounts of petroleum hydrocarbons and all BTEX constituents in MW-4, and detectable amounts of TPH-g, benzene, ethylbenzene, and xylenes in MW-1. Contamkna.nt levels in MW-4 have decreased significantly since November, 1993. 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-1 and MW-3 results below. Parker Environmental Services, 190 East 7th Street, Plttsburg, CA 94565-2317 Phone (510) 439-1024 Fax (510) 439-2566