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4.0 SUMMARY 4F RESULTS <br /> ' A summary of the analytical results from current and past well sampling is presented in Table <br /> 1. Based on the groundwater-level data for May 31, 2002, ATC has interpreted the <br /> groundwater gradient and flow direction for the upper aquifer as shown on Figure 3. In the <br /> upper aquifer monitoring wells MW-5, MW-6, MW-7 and MW-10, the groundwater elevation <br /> decreased from the previous quarter'an average of 0.0875 feet, ranging from 0.02 feet in <br /> monitoring well MW-10 to 0.15 feet in monitoring well MW-5. The apparent groundwater <br /> flow direction in the upper aquifer was generally southeasterly at a gradient of approximately <br /> 0.002 (Figure 3). <br /> Based on the groundwater-level data for May 31, 2002 (Table 1), ATC has interpreted the <br /> groundwater gradient and flow direction for the lower aquifer as shown on Figure 4. In the lower <br /> ' aquifer monitoring wells MW-1R, MW-2, MW-3, MW-4 and MW-8 the groundwater level <br /> increased from the previous quarter an average of 0.13 feet, ranging from an increase of 0.12 feet <br /> in monitoring wells MW-1R to 0.21 in MW-3. The groundwater level decreased 0.01 feet in <br /> monitoring well MW-9. The apparent groundwater flow direction in the lower aquifer was <br /> generally southeasterly at a gradient of approximately 0.002 (Figure 4). <br /> i <br /> I <br /> Laboratory analysis of the water samples collected on May 31, 2002 indicate TPH-G, BTEX, an <br /> MTBE were not detected in groundwater samples collected from MW-3, MW-8 and MW-9, in <br /> the local lower aquifer, and MW-6 and MW-10, in the local upper aquifer. BTEX was not <br /> detected in the any of the groundwater samples during this sampling event. MTBE was detected <br /> in groundwater samples collected from MW-1R (77 micrograms per liter (µg/l)), MW-2 (1,100 <br /> ' µg/1), and MW-4 (1.1 µg/1) in the lower aquifer; and MW-5 (1,500 µg11) and MW-7 (0.95 gg/1) iri <br /> the upper aquifer. Fuel oxygenates other than MTBE (TBA, DIPS, ETBE, TAME and 1,2-DCA) <br /> ' were not detected in the groundwater samples collected from the ten wells sampled this quarter <br /> with the exception of TAME in MW-2 (9.7 µg/1) and MW-5 (21 µg/1). The next quarterly <br /> ' groundwater sampling is scheduled for the third quarter of 2002. <br /> 1 <br /> Quarterly GW Monitoring Report-2nd Qtr 2002 <br /> Quik Stop No. 132 <br /> NATO ATG Project No.75.62503.3203 <br /> i JAPROJECTSIQUIK STOP MKTStQS 13Maportst200211stQt2002Rpt August 23,2002 <br /> Page 5 of 6 <br />