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' Second Quarter 2004 Groundwater Monitoring Report <br /> Boyett Petrqleum,419 S.Main,Manteca,CA <br /> Page 2 <br />' <br /> samples), and collection of water qualityfeld parameters.No floating Product sheen, or odors associated <br /> with petroleum hydrocarbons were observed in the groundwater inspection samples from the monitor <br /> wells. Field observations are included on the Groundwater Monitoring Field Forms, attached. <br /> GROUNDWATER ELEVATIONS AND GRADIENT <br />' The average depth to groundwater was approximately 22.61 feet below the well measuring points, an <br /> increase of 2.28 feet since the previous monitoring event (March 2004). Monitor wells MW-9, MW-11, <br /> and EW-1 are screened in a deeper zone than the other monitor wells at the site. Groundwater elevations <br /> in these three wells are lower than in nearby wells, indicating that there is currently a downward vertical <br /> gradient at the site. There was an upward vertical gradient at the site during the March 2004 monitoring <br /> event. Groundwater elevation data are presented in Table 1, below, and historical groundwater elevation <br />' data are attached. <br /> Table 1: Groundwater Elevation Data June 24, 2004 <br /> Monitoring Well TOC Elevation[ Screened Depth to Groundwater <br /> Interval fts) Groundwater Elevation2 <br /> MW-2 35.97 15-25 23.28 12.69 <br /> MW-3 36.18 15-25 21.61 14.57 <br /> MW-4R 35.21 10-25 21.22 13.99 <br /> MW-6 36.07 10-25 23.52 12.55 <br />' MW-7 36.42 10-25 22.65 13.77 <br /> MW-8 36.43 10-25 21.33 15.10 <br /> MW-9 35.95 40-50 23.46 12.49 <br /> MW-10 36.09 10-25 21.55 14.54 <br />' MW-11 36.15 29-39 23.67 12.48 <br /> EW-1 36.23 29-39 23.79 12.44 <br /> 'TQC Elevation:Elevations are referenced to NAVD88 datum,NGS Benchmark H5 4486. <br /> 2Groundwater Elevation:Elevations are measured from the top of the well casings and are referenced to the benchmark indicated above. <br /> All measurements are in feet. <br /> 1 An estimated groundwater gradient of 0.0217 ft/ft towards the south was calculated using water level data <br /> from monitor wells MW-2, MW-6, and MW-8 (Figure 3, attached). Historical groundwater gradients <br /> reported for the site have been highly variable (Table 2, on the next page, and Figure 4, attached). <br /> 1 <br /> �a CONDOR <br />