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Eckert Cold Stora ge Company 1 757 Moffat Blvd, Manteca, California Quarterly Groundwater Sam Q l y Sampling g Report December, 2000 ' Narrative t On December 29, 2000, Geo-Analytical Laboratories, Inc., conducted field measurements, well pumping and groundwater sampling on seven (7) groundwater monitoring wells located at this site (Figure 1, 2A& 2B). The on-site domestic well was ' also sampled during this event. Groundwater elevations were taken from eight (8) wells prior to pumping (Table 1 & ' Appendix B). All monitoring wells were evacuated by means of a steam-cleaned, stainless steel bladder-type pump, except MW-2. The sampler from Geo-Analytical Laboratories was unable to retrieve water from 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 was 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 P the State-certified laboratory, Geo-Analytical Laboratories, Inc., in Modesto, California. ' The analyses requested for the water samples was EPA method 8260E for BTX&E (Benzene, Toluene, Xylene, and Ethyl Benzene), oxygenates, EDB (Ethylene Dibromide), and 1,2-DCA (1,2-Dichloroethane), EPA method 5030/Luft (GCFID) for ' Gasoline, and EPA method 3510/Luft for Diesel. The domestic well on-site was analyzed using EPA method 524.2. The laboratory analytical data, chain of custody report, and QA/QC documents can be found in Appendix A of this report. 1 ' Groundwater Gradient The water level measurements from eight the (8) monitoring wells were used to calculate ' the gradient and construct a groundwater gradient map (Figure 3). The groundwater gradient trend for this quarter is NI 5'W with a downward slope of 0.003 ft/ft. Historical • gradient maps are included in Appendix C.