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October 23, 1995. Results of the October 23, 1995, sampling event indicate that TPHG <br /> was present in groundwater at a concentration of 20,000 ppb. Benzene, toluene, <br />' ethylbenzene and total xylenes were detected at concentrations of 590 ppb, 1,100 ppb, <br /> 600 ppb, and 3,600 ppb, respectively. The sample from monitoring well MW-2 contained <br /> a total xylene isomer concentration of 2.0 ppb. TPHG and BTEX concentrations were <br /> 1 below laboratory detection limits in the sample collected from well MW-3. The results of <br /> analyses are summarized in Table 3. Copies of the laboratory analysis reports are <br /> presented in Appendix C. <br /> 5.4 Groundwater Flow Direction and Gradient <br /> ' The wellhead elevations of the monitoring wells at the site were surveyed by Tom O. <br /> Morrow, Inc., of West Sacramento, California. The surveyed elevations and the depth to <br /> groundwater measurements were used to evaluate the potentiometric surface beneath the <br /> site. The groundwater flow direction on September 25, 1995, was to the east with a <br /> hydraulic gradient of 0.002 (see Figure 5). Groundwater elevation data are presented in <br /> ' Table 3. <br /> c, <br /> SAC�NVJ0 0805\08051470.1BS-9Spas:1 Rev.0,2/6/96 <br /> 0805-147.01 5-2 <br />