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Eckert Cold Storage Company 757 Moffat Blvd, Manteca, California April 10, 2001 Quarterly Groundwater Sampling Report; March, 2001 Page: 2 •� Summary of Analytical Findings ' This quarter contaminants were detected in all wells except for the Domestic Well and MW-6 (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: 3/5%1001 TPH- TPH- B T E X MTBE ETH BTA DIPE ETBE TAME EDB1,2 Gas Diesel DCA Well u u u u u m m u u u ugfL u u u MW-1 2 3 ND 29fl ND 0 t18 ND ND ND ND ND ND ND ND MW-3 :2 :: . ND ND ND ND ND ND ND ND MW-4 0 1.:.: ND . .:: ND 43 ...:.:...x.41...',:...... :. : ND ND ND ND ND ND 12 MW-5 11.7.... 0 2�3: > ND ---A NFA ND ND ND ND ND MW-6 ND ND ND ND ND ND ND ND ND ND ND ND ND ND MW-7 :: .. 98' Q 9 NDi >l :>: ND ND ND ND ND ND ND ND MW-8 fl-:::: ND 7 : .i ND ;:Z ND ND ND ND ND ND ND ND ND ND—None Detected at or above the reporting limit RIPE—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 3/5/2001 Bromodichloromethane Bromoform Dibromochloromethane • Well u.. u u Domestic Well 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 decrease in benzene this quarter from 360 to 290 ug/L. All other analytes have remained at levels consistent with last quarter. The concentration of all analytes in MW-3 have also decreased, along with benzene which fell from 62 to 29 ' ug/L. The concentrations of the chemicals present in MW-4 have remained at nearly the same level as last quarter except for ethyl benzene which increased from 5.8 to 43 ug/L. MW-5 has shown a slight increase in MTBE and 1,2-DCA, while all other chemicals have remained consistent with last quarters concentrations. MW-6 has shown a decrease ' in all analytes since last quarter to ND. MW-7 has shown a decrease in all analytes to the level of ND. MW-8 has shown a significant decrease since last quarter's monitoring event, especially for benzene which has decreased from 310 to 75 ug/L. 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.