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Mr John Johnson Protect 113-06-03, September]6, 1994 Page 3 Gioundwater elevation is about the same as in August, 1993, up to a foot lower than at other times in the year Groundwater flow was to the north-northwest, with a gradient of about 0 002 ft /ft 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 put ge water was placed in a sealed metal drum Before the next well was purged and sampled, the pump was run in one bucket with deter gent and two separate buckets with lap water All purge water and equipment wash water was placed in DOT 171-1 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 PVC 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 rn a cooler for transport to a state certified hazardous materials testing laboratory, McCarnpbell 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 CheaperT Store #37 15 East Grant Line Road, Tracy, California Groundwater Samples Collected on September 8, 1994 ^Sample TPH-g Benzene Toluene Ethylbenzene Xylenes MW-1 610 077 ND<0 5 13 083 MW-2 ND<50 080 ND<O 5 ND<O 5 ND<O 5 MW-3 ND<50 ND<0 5 ND<O 5 ND<0 5 ND<O 5 MW-4 2,500 350 25 25 180 TPH-g and BTEX are in parts per billion, or pgIL ND = Not Detected The sample T esults 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 Contaminant levels in MW-4 have decreased significantly since November, 1993 The State Water Quality Control Board published the LUFT Field Manual (10/89 page 8), which lists Maximum Contairunant Levels, of regulatory threshold for the substance The substances are benzene, xylene and ethylbenzene Toluene has a DepaT tment of Health Services Action Level These are compared with the MW-1 and MW-3 nesults below Parker l nvironmental Services, 190 ]'-East 7th Street, Patsburg, CA 94565-2317 Phone (510) 439-1024 Fax (510) 439-2566