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5 <br /> 4. SUMMARY OF RESULTS <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 3, 1998, ATC Associates Inc. has interpreted the groundwater <br /> gradient and flow directions for the upper aquifer, as shown on Figure 3. In the local upper aquifer <br /> t (Monitoring Wells MW-5, MW-6 and MW-7), the groundwater level decreased from the previous quarter <br /> an average of 0.20 feet, ranging from a decrease of 0.14 feet in Monitoring Well MW-7 to 0.23 feet in <br /> Monitoring Wells MW-5 and MW-6. The apparent groundwater flow direction in the local upper aquifer <br /> is southeasterly at a gradient of approximately 0.0013 (Figure 3). <br /> Based on the water-level data for December 3, 1998 (Table 1), ATC Associates Inc. has interpreted the <br /> groundwater gradient and flow directions for the lower aquifer, as shown on Figure 4. In the local lower <br /> aquifer (Monitoring Wells MW-1R, MW-2, MW-3 and MW-4), the groundwater level decreased from the <br /> previous quarter an average of 0.27 feet, ranging from a decrease of 0.23 feet in Monitoring Well MW-2 <br /> to 0.30 feet in Monitoring Well MW-3. The apparent groundwater flow direction in the local lower <br /> aquifer is southeasterly at a gradient of approximately 0.0006 (Figure 4). <br /> ' <br /> Laboratory Y sample analysis of the water le collected on December 3, 1998 indicates that TPH-G and BTEX <br /> P <br /> ' were not detected in groundwater samples collected from Monitoring Wells MW-1R, MW-3, MW-4, <br /> MW-5, MW-6, and MW-7. TPH-G was detected in MW-2, however, BTEX was not detected in MW-2. <br /> ' Laboratory results of fuel oxygenate compounds by EPA Method 8260 indicates that MTBE was detected <br /> in the groundwater samples collected from Monitoring Wells MW-IR [34 micrograms per liter (ug/L)], <br /> MW-2 (24,000 ug/L) and MW-5 (2,500 ug/L). Tert-butanol was detected in MW-2 (7,400 ug/L). TAME, <br /> DIPE, and ETBE were not detected in any of the groundwater samples. The next quarterly groundwater <br /> sampling is scheduled for the first quarter of 1999. <br /> 1998 Fourth Quarter Groundwater Monitoring Report <br /> HALEHRMANIQUIKSTOP1132198rpt 4th_doc jJanuary 29,1999] <br />