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Eckert Cold Storage Company 757 Moffat Blvd., Manteca, California October 13, 2001 Quarterly Groundwater Sampling Report; September, 2001 Page: 2 • Summary of Analytical Findings This quarter contaminants were detected in all wells except for the Domestic Well (Tabl6, f. 2 and Appendix A). MW-2 was not sampled during this event. A summary of the'g: analytical data for this quarter's monitoring wells is shown below: AO, =l 3/5/2001 TPH- TPH- B T E X MTBE ETH BTA DIPE ETBE TAME EDB Gas Diesel DCA Well ug/L ugIL u ug/L u m L m /L ug/L u ug/L ug/L u _2 L ug/L MW-1 6.6 0.70 1,100 11 390 300 ND ND ND ND ND ND ND ND MW-3 3.0 ND 97 4.4 130 47 5.1 ND ND ND ND ND ND 11 MW-4 0.91 ND 84 9.4 110 130 2.4 ND ND ND ND ND ND ND MW-5 0.41 ND 15 5.4 47 58 ND ND ND ND ND ND ND ND MW-6 0.32 ND 8.5 16 11 55 ND ND ND ND ND ND ND ND MW-7 0.27 ND 8.4 3.8 23 30 ND ND ND ND ND ND ND ND MW-8 21 ND 2,000 33 1,800 1,800 34 NTD ND ND ND ND ND ND 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-3, MW-4 and MW-8, at levels below the maximum allowable (35 ug/L) set by the State of California. The level of MTBE in MW-3 and MW-8 has increased since last quarter and decreased in MW-4. The fact that MTBE is found on-site is curious because MTBE was not present in the fuels on-site. MW-3 also contains 11 ug/L of 1,2-DCA. MW-1 has shown a decrease in benzene this quarter from 3,000 to 1,100 ug/L. All other analytes have decreased since last quarter, except of Diesel which is not present in MW-1 at 0.70 mg/L. The concentration of all gas, Ethyl-benzene, and MTBE in MW-3 have increased, while the other chemicals have decreased. The concentrations of the chemicals present in MW-4 have decreased since last quarter except for Toluene which increased from 8.6 to 9.4 ug/L. MW-5 has shown a slight increase in gasoline, Toluene, Ethyl-benzene, Xylenes, and MTBE. The concentration of 1,2-DCA decreased to ND in MW-5. MW-6 has showed a slight increase in the chemicals present since last quarter. MW-7 has shown slight increases in all analytes that were present last quarter. MW-8 has shown significant increases 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 nearest receptor, which is only 250 feet to the northwest.