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r <br /> 5 <br /> 4. 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-level data for September 2, 1999, ATC has interpreted the groundwater gradient and flow <br /> directions for the upper aquifer, as shown on Figure 3. In the local upper aquifer (Monitoring Wells <br /> MW-5, MW-6 and MW-7), the groundwater level decreased from the previous quarter an average of 1.09 <br /> feet, ranging from 1.12 feet in Monitoring Well MW-7 to 1.08 feet in Monitoring Wells MW-5 and MW- <br /> 6. The apparent groundwater flow direction in the local upper was southeasterly at a gradient of <br /> approximately 0.004 (Figure 3). <br /> Based on the water-level data for September 2, 1999 (Table 1), ATC has interpreted the groundwater <br /> gradient and flow directions for the lower aquifer, as shown on Figure 4. In the local lower aquifer <br /> ' (Monitoring Wells MW-1R, MW-2, MW-3 and MW-4), the groundwater level decreased from the <br /> previous quarter an average of 1.07 feet, ranging from 0.99 feet in Monitoring Well MW-4 to 1.16 feet in <br /> Monitoring Well MW-2. The apparent groundwater flow direction in the local lower aquifer was <br /> southeasterly at a gradient of approximately 0.003 (Figure 4). <br /> Laboratory analysis of the water sample collected on September 2, 1999 indicates that TPH-G and BTEX <br /> were not detected in groundwater samples collected from Monitoring Wells MW-IR, MW-3, MW-4, <br /> MW-6, and MW-7. TPH-G and benzene were detected in MW-2 and MW-5. Laboratory results of fuel <br /> oxygenate compounds by EPA Method 8260 indicates that MTBE was detected in the groundwater <br /> samples collected from Monitoring Wells MW-IR [83 micrograms per liter (ug/L)], MW-2 (11,000 ug/L), <br /> and MW-5 (7,800 ug/L). Tert-butanol was detected in groundwater samples collected from monitoring <br /> ' wells MW-2 (2,700 ug/L) and MW-5 (480 ug/L). TAME was detected in groundwater samples collected <br /> from monitoring wells MW-2 (150 ug/L) and MW-5 (69 ug/L). The next quarterly groundwater sampling <br /> is scheduled for the fourth quarter of 1999. <br /> r <br /> r . <br /> 1 <br /> 1999 Third Quarter Groundwater Monitoring Report <br /> H'.ILEHRMAMQUIKST0p513R99rptt.3rd doe[November 8.19991 <br />