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Eckert Cold Storage Company t757 Moffat Blvd, Manteca, California Quarterly Groundwater Sampling Report July, 1995 1 Narrative ' On July 24, 1995, WHF Environmental Consultants, Inc , in conjunction with HKM Groundwater Monitoring, conducted field measurements, well pumping and groundwater ' sampling on four (4) groundwater monitoring wells located at flus site (Figure 2) Groundwater elevations were taken from four (4) wells prior to pumping (Table 1 & Appendix B) Monitoring wells MW-1 through MW4 were evacuated by means of a steam-cleaned, stainless steel bladder-type pump 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 a steam-cleaned ' disposable bailer The samples were then labeled and placed in an ace chest cooled with Blue Ice,, ' The samples, bailer blanks and trip blank were then logged on a Chain of Custody (Appendix A) and transported to the State-certified laboratory, California Laboratory Services, in Rancho Cordova, California The analysis requested for the water samples ' were EPA method 602 for BTX&E, EPA method 5030/8015 (GCFID) for gasoline and EPA method 3510/8015 for diesel The analytes and concentrations detected are listed in Table 2 of this report Groundwater Gradient t1 measurements from the monitoring The water leve g wells were used to calculate the ' gradient and construct a groundwater gradient map (Figure 3) The gradient this quarter ranges from 0 0011 to 0 0047 ft/ft with a predominant trend toward the north, northwest, . and northeast Groundwater elevations have dropped, since last quarter, by an average of ' 2 04 feet across the site H'istoncal gradient maps are included in Appendix C 1