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Eckert Cold Storage Company <br /> ' 757 Moffat Blvd., Manteca, California <br /> ' Quarterly Groundwater Sampling Report <br /> March, 1997 <br /> ' Narrative <br /> On March 5, 1997, WHF Inc , in conjunction with HKM Environmental, Inc , conducted <br /> field measurements, well pumping and groundwater sampling on four (4) groundwater <br /> monitoring wells located at this site (Figure 2) <br /> ' Groundwater elevations were taken from three (3) wells prior to pumping (Table 1 & <br /> Appendix B) Morutonng wells MW-1, MW-3, and MW-4 were evacuated by means of a <br /> ' steam-cleaned, stainless steel bladder-type pump During the three (3) volume pump <br /> down of each well, samples were collected to measure field pH, electrical conductivity and <br /> temperature (Table 3 & Appendix B) Once stability was achieved, a minimum of three <br /> (3) well volumes were removed and samples were collected with a steam-cleaned <br /> disposable bailer The samples were then labeled and placed in an ice chest cooled with <br /> Blue Ice® <br /> The samples and trip blank were then logged on a Chain of Custody (Appendix A) and <br /> transported to the State-certified laboratory, California Laboratory Services, in Rancho <br /> ' Cordova, California The analysis requested for the water samples was EPA method 602 <br /> for BTX&E/MTBE (Benzene, Toluene, Xylene, and Ethylbenzene / Methyl t-butyl ether), <br /> EPA method 5030/8015 (GCFID) for Gasoline, and EPA method 3510/8015 for Diesel <br /> ' The analytes and concentrations detected are listed below and in Table 2 of this report <br /> ' Groundwater Gradient <br /> The water level measurements from the morutoring wells were used to calculate the <br /> ' gradient and construct a groundwater gradient map (Figure 3) The gradient for this <br /> quarter vaned from 0 00263 ft/ft at N24°W to 0 00741 ft/ft at N65°E Historical gradient <br /> maps are included in Appendix C <br />