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Eckert Cold Storage Company 757 Moffat Blvd., Manteca, California ' Quarterly Groundwater Sampling Report September, 2001 Narrative ' On September 10, 2001, 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®. MThe samples and trip blank were then logged on a Chain of Custody p and transported to the State-certified laboratory, Geo-Analytical Laboratories, Inc., in Modesto, California. The analyses requested for the water samples was EPA method 8260B 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. Groundwater Gradient _ The water level measurements from the eight (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 N81E with a downward slope of 0.0007 ft/ft. Historical gradient maps are included in Appendix C.