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{ + J S r Eckert Cold Storage Companyg 757 Moffat Blvd, Manteca, California ' Quarterly Groundwater Sampling Report ' September, 1999 Narrative ' On September 10, 1999, VVW Inc., conducted field measurements, well pumping and groundwater sampling on six (6) groundwater monitoring wells located at this site (Figure 1 & 2). Groundwater elevations were taken from six (6) wells prior to pumping (Table 1 & Appendix B). All monitoring wells were evacuated by means of a steam-cleaned, stainless tsteel 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 and transported to the State-certified laboratory, GeoAnalytical Laboratories, Inc., in Modesto, California. The ' analyses requested for the water samples was EPA method 602 for BTX&E (Benzene, Toluene, Xylene, and Ethylbenzene) and MTBE (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 laboratory analytical data, chain of custody report, and QA/QC documents can be found in Appendix A of this report ' Groundwater Gradient ' The water level measurements from monitoring wells, 4, 6, and 7 were used to calculate the gradient and construct a groundwater gradient map (Figure 3). The gradient for this quarter is N28°W at 0.0021 ft/ft. Mstorical gradient maps are included in Appendix C. ' The groundwater elevation at the site fell since last quarter by an average of 1.30 feet across the site.