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1 • ' Eckert Cold Storage Company 757 Moffat Blvd, Manteca, California ' Quarterly Groundwater Sampling Report ' July, 1999 Narrative ' On June 30, 1999, WHF Inc., conducted field measurements, well pumping and groundwater sampling on six (6) groundwater monitoring wells located at this site (Figure 1,2 and 30). Groundwater elevations were taken from six 6 wells prior to pumping Table 1 & { } p p p g Appendix B). All monitoring wells were evacuated by means of a steam-cleaned, stainless steel bladder-type pump, except MW-2. During the three (3) volume pump down of each well, samples were collected to measure field pH, electrical conductivity and temperature ' (Table 3 & Appendix B). Once stability was achieved, a minimum of three (3) well volumes were removed and samples were collected with disposable bailers. The samples were then labeled and placed in an ice chest cooled with Blue Ice®. The samples and trip blank were then logged on a Chain of Custody (Appendix A) and transported to the State-certified laboratory, GeoAnalytical Laboratories, Inc., in Modesto, California. The analysis requested for the water samples was EPA method 602 for BTX&E (Benzene, Toluene, Xylene, and Ethylbenzene / Methyl t-butyl ether), EPA method 5030/Luft (GCFID) for Gasoline, and EPA method 3510/Luft for Diesel. MTBE ' contamination was confirmed by EPA method 8260. The analytes and concentrations detected are listed below and in Table 2 of this report. 1 Groundwater Gradient ' The water level measurements from the monitoring wells were used to calculate the gradient and construct a groundwater gradient map (Figure 3). The gradient for this quarter is N88°W at 0.0035 ft/ft. Historical gradient maps are included in Appendix C. ' The groundwater elevation at the site fell since last quarter by an average of 0.85 feet across the site. 1