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i 6 5.0 SUMMARY OF RESULTS AND DISCUSSION A summary of the analytical results from current and past well samplings is presented in Table 1 Based on the water-level data for March 16, 1995 (Table 1 ), Smith Environmental has interpreted the groundwater gradient and flow directions for the upper and lower aquifers, as shown on Figures 3 and 4, respectively In the local upper aquifer (Monitoring Wells MW-5, MW-6 and MW-7), the groundwater level rose an average of 2 38 feet, ranging from 2 34 feet in Monitoring Well MW-6 to 2 42 feet ' in Monitoring Well MW-7 In the local lower aquifer (Monitoring Wells MW-1 R, MW-2, MW-3, and MW-4), the groundwater level rose an average of 2 49 feet, ranging from 2 30 feet in Monitoring Well MW-4 to 2 93 feet in Monitoring Well MW-1 R These are the highest groundwater elevations which have been measured at the site since ' monitoring was initiated The apparent groundwater flow direction in the local upper aquifer is southeasterly at a gradient of approximately 0 006 (Figure 3) The apparent groundwater flow direction in the local lower aquifer is easterly at a gradient of approximately 0 003 (Figure 4) Laboratory analyses of the water samples collected that from Monitoring Well MW-5 before and after pumping on February 22, 1995, (Samples MW-5 and MW-5A) indicated that TPH-G and BTEX were not detected in these samples Laboratory analyses of water samples collected on March 16, 1995, indicated that concentrations of TPH-G (350 ppb) and benzene (5 9 ppb) were detected in Monitoring Well MW-2 TPH-G and BTEX were not detected in any of the other sampled monitoring wells Wells MW-3 and MW-4 were not sampled because they are located upgradient of the underground storage tanks, and, historically, TPH-G and BTEX have not been detected in the groundwater from these wells The next quarterly groundwater sampling is scheduled for June 1995 1 PL1W 194 Z731REPORTSMTOTR 508 [Jun 7 19951 CamweEnvironmental