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5 <br /> r <br /> 6 <br /> 4.0 SUMMARY OF RESULTS <br /> 1 <br /> A summary of the analytical results from current and past well sampling is presented in Table 1. Based <br /> on the water-Ievel data for June 15, 2000, ATC has interpreted the groundwater gradient and flow <br /> directions for the upper aquifer, as shown on Figure 3. In the upper aquifer (monitoring wells MW-5, <br /> MW-6, and MW-7), the groundwater elevation decreased from the previous quarter an average of 0.85 <br /> ' feet, ranging from 0.84 feet in monitoring well MW-7 to 0.85 feet in monitoring wells MW-5 and MW- <br /> 6. The apparent groundwater flow direction in the upper aquifer was southeasterly�at a gradient of <br /> approximately 0.0044 (Figure 3). <br /> Based on the water-level data for June 15, 2000 (Table 1), ATC has interpreted the groundwater gradient <br /> and flow directions for the lower aquifer, as shown on Figure 4. In the lower aquifer (monitoring wells <br /> MW-1R, MW-2, MW-3, MW-4, and MW-8), the groundwater level decreased from the previous quarter <br /> f an average of 0.86 feet, ranging from 0.82 feet in monitoring well MW-2 to 0.91 feet in monitoring well <br /> MW-8. The apparent groundwater flow direction in the lower aquifer was southeasterly at a gradient of <br /> approximately 0.00 16 (Figure 4). <br /> Laboratory analysis of the water sample collected on June 15, 2000 indicates that TPH-G and BTEX were <br /> not detected in groundwater samples collected from monitoring wells MWAR, MW-3, MW-4, MW-5, <br /> MW-6, MW-7, and MW-8. TPH-G and MTBE were detected in the groundwater sample from monitoring <br /> well MW-2. Benzene was not detected in any of the groundwater samples. Laboratory results of fuel <br /> oxygenate compounds by EPA Method 8260 indicates that MTBE was detected in the groundwater <br /> samples from monitoring wells MWAR (42 micrograms per liter [pg/1]), MW-2 (5,500 µg/1), and MW-5 <br /> (5,500 µg/1). The next quarterly groundwater sampling is scheduled for the third quarter of 2000. <br /> t <br /> r� <br /> 1 <br /> 2900 Second Quarter Groundwater Monitoring Report <br /> 11 PLEASANTOMProjectWn Progres9lQU1K5T0F5Q5 332(0003)%REPORTS1200012ndQV2006rpt.dx <br />