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5 <br /> 4.0 SUMMARY OF RESULTS <br /> A summary of the analytical results from current and past well sampling is presented in Table <br /> r� 1. Based on the water-level data for August 23, 2001, ATC has interpreted the groundwater <br /> gradient and flow direction for the upper aquifer as shown on Figure 3. In the upper aquifer <br /> monitoring wells MW-5, MW-6, and MW-7, the groundwater elevation decreased from the <br /> previousuarter an average of 0.91 feet, ranging from 0.084 feet in monitoring well MW-6 to <br /> q g g g <br /> 1.02 feet in monitoring well MW-5. The apparent groundwater flow direction in the upper <br /> aquifer was generally southeasterly at a gradient of approximately 0.003 (Figure 3). <br /> Based on the water-level data for August 23, 2001 (Table 1), ATC has interpreted the <br /> groundwater gradient and flow direction for the lower aquifer as shown on Figure 4. In the lower <br /> aquifer monitoring wells MWAR, MW-2, MW-3, MW-4, and MW-8, the groundwater level <br /> decreased from the previous quarter an average of 0.76 feet, ranging from 0.63 feet in monitoring <br /> wells MW-8 to 0.89 in MW-2. The apparent groundwater flow direction in the lower aquifer <br /> was generally easterly at a gradient of approximately 0.002 (Figure 4). <br /> ATC retained the services of Spectrum Exploration, of Stockton, California, to advance two soil <br /> boreholes and install lower aquifer and upper aquifer groundwater monitoring wells MW-9 and <br /> MW-10, respectively, on August 7, 2001. ATC retained Morrow Surveying, a California- <br /> licensed surveyor, to survey the newly installed monitoring wells on August 29, 2001. <br /> ILaboratory analysis of the water samples collected on August 23, 2001 indicate that TPH-G, <br /> BTEX, and MTBE were not detected in groundwater samples collected from MW-3, MW-4 and <br /> MW-9 in the local lower aquifer. TPH-G, MTBE and BTEX , with the exception of total xylenes, <br /> concentrations dropped to below detection limits in'MW-8. In the local upper aquifer, TPH-G, <br /> BTEX, and MTBE were not detected in groundwater samples collected from MW-6, MW-7 and <br /> MW-10. TPH-G was detected in groundwater samples collected from MW-IR and MW-2 in the <br /> lower aquifer and MW-5 in the upper aquifer. BTEX was not detected in any of the well samples <br /> with the exception of low concentrations of benzene in MW-2 and total xylenes in MW-8. <br /> J.Vu Progress%QU1KST4P'QS 1321RF.POR7'S1200113rdQrr2OOErpt,doc <br />