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' Boyett Petroleum <br /> 419 Main Street, Manteca, California <br /> Quarterly Groundwater Sampling Report <br />' September, 2002 <br />' Narrative <br />' On September 12, 2002, GeoAnalytical Laboratories, Inc., conducted field measurements, <br /> well pumping and groundwater sampling on nine (9) groundwater monitoring wells <br /> located at this site (Figures 1 and 2). <br /> Groundwater elevations were taken from nine (9) wells prior to pumping (Table I & <br /> Appendix B). Monitoring wells MW-1 through MW-9 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, <br /> and temperature (Table 3 & Appendix B). Once stability was achieved, a minimum of <br /> three (3) well volumes were removed and samples were collected with a disposable <br /> bailer. The samples were then labeled and placed in an ice chest cooled with Ice®. <br /> The samples were then logged on a Chain of Custody (Appendix A) and transported to <br /> the State-certified laboratory, GeoAnalytical Laboratory Inc., in Modesto, California. The <br />' analysis requested for the nine (9) water samples was EPA method 8260B for BTX&E <br /> (Benzene, Toluene, Xylene, and Ethyl-Benzene), MTBE, and EPA method GCFID <br /> (5030/Luft) for gasoline. The analytes and concentrations detected are listed in Table 2 of <br /> this report. <br />' Groundwater Gradient <br /> The water level measurements from three (3) monitoring wells (MW-2, MW-3, MW-7) <br /> were used to construct a groundwater gradient map (Figure 3). MW-9 is a deep well, <br /> therefore it is not used in the gradient calculation. This quarter, the groundwater gradient <br /> trend is South 400 West with a downward slope of 0.004 ft/ft. Historical groundwater <br /> gradient maps are provided for reference in Appendix C. <br /> 1 <br /> 1 <br /> 1 <br />