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' Eckert Cold Storage Company <br /> 757 Moffat Blvd, Manteca, California July Z7, 2000 <br /> ' Quarterly Groundwater sampling Report; June 2000 Page: 2 <br /> • Appendix C. The groundwater elevation at the site has fallen since last quarter by an <br /> average of 1.78 feet across the site. <br /> ' Summary of Analytical Findings <br /> This quarter contaminants were detected in all wells except for MW4, MW-6, and the <br /> Domestic Well (See Table A). MW-2 was not sampled during this event. <br /> Table A: Tabular Summary of Groundwater Analytical Data <br /> 3/27/00 Benzene Tol ene E-Benzene Xylene MTBE Diesel Gasoline <br /> ' Well u ua u u u m m <br /> ........1132 <br /> MW-3lit�.....:.... . .: �8...:::......... . .......... :.... . .. ND ... <br /> I. <br /> MW4 ND ND ND ND ND ND ND <br /> MW-536...::: 8..>.:. 5........ ....:.. ND ::. 3.6........ <br /> MW-6 ND ND ND ND ND ND ND <br /> ' MW-7 ,' g 4.4 ND ND9 <br /> MW-8 D :+ 2 „ > IEI ::, :.:: ..:, f0 .. a ND 17..; ...:: <br /> Domestic ND FOR ALL ANALYTES <br /> ' . Well <br /> MTBE contamination is present this quarter at levels below the maximum allowable (35 <br /> ' ug/L) set by the State of California for the third consecutive quarter. The fact that MTBE <br /> is found on-site is curious because MTBE was not present in the fuels on-site. <br /> ' The levels of Benzene in wells MW-1, MW-3, and MW-8 have increased since the last <br /> monitoring event in March 2000. It is unknown if an increase in Benzene has occurred in <br /> MW-5 and MW-7 since last quarter because those wells were not sampled in March <br /> 2000. Based on past and present analytical data, Benzene is the constituent that poses the <br /> greatest threat to human health and the environment but it is not found in the receptor <br /> ' only 250 feet to the northwest. <br /> The analysis of the water from the on-site domestic well did not reveal the presence of <br /> contamination. All of the constituents tested using EPA method 524.2 were not detected <br /> ' at or above the reporting limits. The domestic well is a receptor in close proximity to the <br /> contaminated area (250' to the northwest) and does not show the presence of any <br /> petroieum related chemical. The contamination has had approximately 14 years to <br /> migrate to the receptor but the analytical data indicates that this receptor is not adversely <br /> affected. <br /> WBF will determine an effective method to sample MW-2 so that it can be incorporated <br /> into the next quarter's sampling event. During this sampling event two types of pumps <br /> 1 <br />