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Eckert Cold Storage Company ' 757 Moffat Blvd, Manteca, California January 15, 2001 Quarterly Groundwater Sampling Report; December, 2000 Page. 2 ' Summary of Analytical Findings ' This quarter contaminants were detected in all wells except for the Domestic Well (Table 2 and Appendix A). MW-2 was not sampled during this event. A summary of the analytical data for this quarter's monitoring wells is shown below: 22129100 TPH- TPH- B T E X MTBE ETH BTA DIPE ETBE TAME EDB 1,2- Gas Diesel DCA Well ur& u u u u&I m m E& u u u u uE& u u MW-1 -; .1 fl 2T-' ND 96 ND ND ND ND ND ND ND ND ND MW-3 2.3 63 < G 7 9 ND ND Nm ND ND ND ND M MW-4 ¢ .. ND ,d ND ND ND ND ND Mw-s a. rm . : ass 3.� ......:. a a te :..: ND ND ND ND rm ND z MW-6 pg NDND 0'T ND >a ND ND ND ND ND ND ND bm MW-7 ND ND ND ND ND ND ND ND 34 ND ]4Ci :. 12 ND ND ND ND ND ND ND ND Domestic Well ND For All Analytes Tested ' ND—None Detected at or above the reporting limit DIPE—Di-Isopropyl Ether BTEX—Benzene,Toluene,Ethyl Benzene,Xylenes ETBE—Ethyl Tert-Butyl Ether MTBE—Methyl Tert-Butyl Ether TAME—Tert-Amyl Methyl Ether ETH—Ethanol EDB—Ethylene Dibromide ' BTA—Tert-Butanol 1,2-DCA—1,2-Dichloroethane ' MTBE contamination is present this quarter in MW-4 and MW-5, at levels below the maximum allowable (35 ug/L) set by the State of California. The fact that MTBE is ' found on-site is curious because MTBE was not present in the fuels on-site. MW-1 has shown a significant decrease in all analytes this quarter except for a slight increase in gasoline. The concentration of analytes in MW-3 have also decreased, except for a slight increase in diesel. MW-4 has shown a decrease in analytes, but has shown 14 ug/L for 1,2 DCA, which was not tested for in the last quarter's monitoring event in any ' of the wells. MW-5 has shown a decrease in analytes, but has also shown 3.2 ug/L for 1,2 DCA. MW-6 has shown a slight increase in benzene, but generally, a decrease in the other analytes. MW-7 has shown a slight increase in TPH-gas, benzene, toluene, ethyl ' benzene and xylenes, where last quarter's event showed ND for all analytes. MW-8 has shown a significant decrease since last quarter's monitoring event. ' Based on past and present analytical data, Benzene is the constituent that poses the greatest threat to human health and the environment but it is not found in the receptor, which is only 250 feet to the northwest. ' The analysis of the water from the on-site domestic well did not reveal the presence of contamination. All of the constituents tested using EPA method 524.2 were not detected ' at or above the reporting limits. The domestic well is a receptor in close proximity to the