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5 • 4. SUMMARY OF RESULTS 1 A summary of the analytical results from current and past well sampling is presented in Table 1. Based on the water-level data for March 27, 2000, ATC has interpreted the groundwater gradient and flow directions for the upper aquifer, as shown on Figure 3. In the upper aquifer (Monitoring Wells MW-5, MW-6, and MW-7), the groundwater level decreased from the previous quarter an average of 0.47 feet, ranging from 0.40 feet in Monitoring Well MW-7 to 0.54 feet in Monitoring Well MW-5. The apparent groundwater flow direction in the upper aquifer was southeasterly at a gradient of approximately 0.004 ' (Figure 3). Based on the water-level data for March 27, 2000 (Table 1), ATC has interpreted the groundwater gradient and flow directions for the lower aquifer, as shown on Figure 4. In the lower aquifer (Monitoring Wells MW-1R, MW-2, MW-3, MW-4, and MW-8), the groundwater level increased from the previous quarter an average of 2.65 feet, ranging from 2.56 feet in monitoring well MW-8 to 2.71 feet in lie monitoring well MW-3. The apparent groundwater flow direction in the lower aquifer was southeasterly at a gradient of approximately 0.0019 (Figure•4). Laboratory analysis of the water sample collected on March 27, 2000 indicates that TPH-G and BTEX were not detected in groundwater samples collected from Monitoring Wells MW-3, MW-4, MW-6, MW-7, and MW-8. TPH-G was detected in MW-1R, MW-2, and MW-5. Benzene was not detected in any of the groundwater samples. Laboratory results of fuel oxygenate compounds by EPA Method 8260 indicates that MTBE was detected in the groundwater samples collected from Monitoring Wells MW-1R [110 micrograms per liter (ug/L)I, MW-2 (7,100 ug/L), and MW-5 (7,000 ug/L). The next quarterly ' groundwater sampling is scheduled for the second quarter of 2000. 2000 First Quarter Groundwater Monitoring Report 1:Vn Progress%QUIKST0P\Q5 132(0003)\REP0RTSt2000i1stQ4r2o00rprdm[May 23,20001