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i <br /> ' 4.0 SUMMARY OF RESULTS <br /> A summary of the analytical results from current and past well sampling is presented in Table <br /> 1. Based on the water-level data for February 27, 2002, ATC has interpreted the groundwater <br /> gradient and flow direction for the upper aquifer as shown on Figure 3. In the upper aquifer <br /> monitoring wells MW-5, MW-6, MW-7 and MW-10, the groundwater elevation decreased <br /> from the previous quarter an average of 0.90 feet, ranging from 0.92 feet in monitoring well <br /> MW-10 to 0.88 feet in monitoring well MW-5. The apparent groundwater flow direction in the <br /> upper aquifer was generally southeasterly at a gradient of approximately 0.001 (Figure 3). <br /> ' Based on the water-level data for February 27, 2002 (Table 1), ATC has interpreted the <br /> groundwater gradient and flow direction for the lower aquifer as shown on Figure 4. In the Iower <br /> aquifer monitoring wells MW-IR, MW-2, MW-3, MW-4, MW-8, and MW-9, the groundwater <br /> level decreased from the previous quarter an average of 0.88 feet, ranging from 0.86 feet in <br /> monitoring wells MW-8 to 0.92 in MW-9. The apparent groundwater flow direction in the lower <br /> aquifer was generally northeasterly at a gradient of approximately 0.005 (Figure 4). <br /> ' Laboratory analysis of the water samples collected on February 27, 2002 indicate that TPH-G, <br /> BTEX, and MTBE were not detected in groundwater samples collected from MW-3, MW-8 and <br /> MW-9, in the local lower aquifer, and MW-6 and MW-10, in the local upper aquifer. BTEX was <br /> not detected in the any of the groundwater samples during this sampling event MTBE was <br /> detected in groundwater samples collected from MW-1R (I 10 micrograms per liter (pg/l)), MW- <br /> 2 (1,000 pg/1), and MW-4 (2.0 µg11) in the lower aquifer; and MW-5 (2,200 µg/l) and MW-7 (2.0 <br /> µg11) in the uppper aquifer. Fuel oxygenates other than MTBE (TBA, DIPE, ETBE, TAME and <br /> 1,2-DCA)Dwere�not detected in the groundwater samples collected from the ten wells sampled <br /> 1 <br /> this quarter. The next quarterly groundwater sampling is scheduled for the second quarter of <br /> ' 2002. <br /> Quarterly GW Monitoring Report—jst Qtr 2002 <br /> NATO Quik Stop No. 132 <br /> 203 <br /> ATC Project No.75.62503.3203 <br /> June 3, 2002 <br /> J,IPROJECTSSQUIK STOP WTSIOS 1321RepoMs1200211VUV2002Rp1 Page 5 of 6 <br />