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4-1 <br /> i 4. SUMMARY OF RESULTS <br /> A summary of the analytical results from current and past well sampling is presented in Table I Based <br /> on the water-level data for September 22, 1998 (Table 1), ATC Associates Inc has interpreted the <br /> groundwater gradient and flow directions for the upper aquifer, as shown on Figure 3 In the local upper <br /> aquifer(Monitoring Wells MW-5, MW-6 and MW-7), the groundwater level decreased from the previous <br /> quarter an average of 152 feet, ranging from 149 feet in Monitoring Well MW-5 to 1 55 feet in <br /> Monitoring Well MW-7 The apparent groundwater flow direction in the local upper aquifer is <br /> southeasterly at a gradient of approximately 0 0026 (Figure 3) <br /> Based on the water-level data for September 22, 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-IR, MW-2, MW-3 and MW-4), the groundwater level decreased from the <br /> previous quarter an average of 146 feet, ranging from 145 feet in Monitoring Wells MW-2 and MW-3 to <br /> 148 feet in Monitoring Well MW-1R The apparent groundwater flow direction in the local lower aquifer <br /> is southerly to southeasterly at a gradient of approximately 0 0013 (Figure 4) <br /> Laboratory analysis of the water sample collected on September 22, 1998 indicates that TPH-G and <br /> BTEX were not detected in groundwater samples collected from Monitoring Wells MW-1R, MW-3, MW- <br /> 5, MW-6, and MW-7 TPH-G was detected in MW-2, and MW-4 Benzene was 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-1R [18 micrograms per liter (ug/1)], <br /> MW-2 (18,000 ug/l) and MW-5 (2,100 ug/1) Tert-butanol was detected in MW-2 (3,200 ug/1), and MW-5 <br /> (180 ug/1) TAME was detected in MW-2 (240 ug/1), and m MW-5 (14 ug/l) DIPE and ETBE were not <br /> detected in any of the groundwater samples The next quarterly groundwater sampling is scheduled for <br /> the fourth quarter of 1998 <br /> 1998 3rd Quarter Groundwater Momtonng Report <br /> H\Employee Share Area\LEHRMAN\QUIKST0M132\98rpt 3rdd doc jNovemher 23 19981 <br />