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5 <br /> li <br /> 4. SUMMARY OF RESULTS <br /> tr. <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 December 9, 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 0.47 <br /> feet, ranging from 0.40 feet in Monitoring Well MW-7 to 0.54 feet in Monitoring Well MW-5. The <br /> apparent groundwater flow direction in the local upper was southeasterly at a gradient of approximately <br /> ' 0.004 (Figure 3). <br /> Based on the water-level data for December 9, 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-IR, MW-2, MW-3, MW-4, and MW-8), the groundwater level decreased from <br /> the previous quarter an average of 0.54 feet, ranging from 0.63 feet in Monitoring Well MW-3 to 0.45 feet <br /> in Monitoring Well MW-2. The apparent groundwater flow direction in the local lower aquifer was <br /> southeasterly at a gradient of approximately 0.0012 (Figure 4). <br /> ' Laboratory analysis of the water sample collected on December 9, 1999 indicates that TPH-G and BTEX <br /> were not detected in groundwater samples collected from Monitoring Wells MW-3, MW-4, MW-6, MW- <br /> 7, and MW-8. TPH-G was detected in MW-1R, MW-2, and MW-5. Benzene was not detected in any <br /> other groundwater samples. Laboratory results of fuel oxygenate compounds by EPA Method 8260 <br /> indicates that MTBE was detected in the groundwater samples collected from Monitoring Wells '1ViW-1R <br /> ' [210 micrograms per liter (ug/L)], MW-2 (11,000 ug/L), and MW-5 (6,300 ug/L). Tert-butanol was <br /> detected in groundwater samples collected from monitoring well MW-2 (3,500 ug/L). The next quarterly <br /> ' groundwater sampling is scheduled for the first quarter of 2000. <br /> 1 <br /> }ova Frn uth t}a;rrrr firrrunJ�aur 1lnnrurom�Rci+r; <br /> 111.0 RMAN q4:l KSTOPA t_vvrpiAlh 1-]J "S '11'0] <br />