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1 <br /> • <br /> Eckert Cold Storage Company <br /> 757 Moffat Blvd, Manteca, California <br /> Quarterly Groundwater Sampling Report <br /> ' April, 1998 <br /> Narrative <br /> i, On April 7, 1998, WHF Inc., in conjunction with HKM Environmental, Inc., conducted <br /> field measurements, well pumping and groundwater sampling on seven (7) groundwater <br /> monitoring wells located at this site (Figure 2). <br /> Groundwater elevations were taken from seven (7) wells prior to pumping (Table 1 & <br /> Appendix B). All monitoring wells MW-1, MW-3, and MW4 except MW-2 were <br /> evacuated by means of a steam-cleaned, stainless steel bladder-type pump. During the <br /> three (3) volume pump down of each well, samples were collected to measure field pH, <br />',. electrical conductivity and temperature (Table 3 & Appendix B). Once stability was <br /> achieved, a minimum of three (3) well volumes were removed and samples were collected <br /> with a steam-cleaned disposable bai.fer. The samples were then labeled and placed in an <br /> ice chest cooled with 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 (Benzene, Toluene, Xylene, and Ethylbenzene / Methyl t-butyl ether), EPA <br /> ' method 5030/8015 (GCFID) for Gasoline, and EPA method 3510/8015 for Diesel. The <br /> analytes and concentrations detected are listed below and in Table 2 of this report. <br /> ,1 <br /> Groundwater Gradient <br /> The water level measurements from the monitoring wells were used to calculate the <br /> gradient and construct a groundwater gradient map (Figure 3). The gradient for this <br /> quarter is N55°W at 0.0083 ft/ft. Historical gradient maps are included in Appendix C. <br /> iJ� <br />