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DISCUSSION OF RESULTS <br /> The laboratory results for this and previous quarterly ground <br /> water monitoring and sampling events are summarized in <br /> Table 1 . The official laboratory reports and Chain of <br /> Custody Record, are included in Appendix D. Ground water <br /> elevation map, based on the depth to ground water <br /> measurements collected on August 21 , 1991, is shown <br /> in Figure 3. Concentrations of petroleum hydrocarbon <br /> constituents detected in ground water samples are presented <br /> in Figure 4. <br /> Results of laboratory analysis for this ground water <br /> monitoring and sampling event indicate the following: <br /> r <br /> o The average depth to ground water was 10 feet and the <br /> general ground water hydraulic gradient onsite was <br /> 0.011 foot/foot to the northeast. <br /> o TPH-G, TPH-D, and BTEX constituents were not detected <br /> above method detection limits in ground water samples <br /> from Monitoring Wells AW-1, AW-2 , and AW-4 through AW-8 . <br /> o Concentrations of TPH-D (22 , 000 ppb) , TPH-G (620 ppb) , <br /> and xylenes (0. 70 ppb) were detected from AW-3 . Matrix <br /> effects caused lab to dilute extracted solution, thereby <br /> increasing detection limits . <br /> ALTON GEOSCIENCE <br /> Tridib K. Guh <br /> Pr 'ect Mana r <br /> Pete un . <br /> G. 5089 <br /> Asso iat , Northern California Operations <br /> 2 <br />