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4. SUMMARY OF RESULTS 4-1 <br /> A summary of the analytical results from current and past well samplings is presented in Table 1 Based <br /> on the water-level data for March 10, 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 /> a aquifer (Monitoring Wells MW-5, MW-6 and MW-7), the groundwater level increased from the previous <br /> quarter an average of 3 77 feet, ranging from 3 73 feet in Monitoring Well MW-7 to 3 80 feet in <br /> Monitoring Well MW-5 The apparent groundwater flow direction in the local upper aquifer is <br /> southeasterly at a gradient of approximately 0 0043 (Figure 3) <br /> ' Laboratory analysis of the water sample collected on March 10 1998 from <br /> Monitoring Well MW-5 <br /> ' indicates that TPH-G and BTEX were not detected in this sample TPH-G has not been detected in MW-5 <br /> since February 22, 1995 and BTEX has not been detected in MW-5 since December 17, 1993 MTBE <br /> was detected in the sample collected from Monitoring Well MW-5 at a concentration of 1,400 parts per <br /> billion (ppb) Laboratory results of the analysis for the fuel oxygenate compounds by EPA Method 8260 <br /> showed 390 micrograms per liter (ug/L) of tert-butanol 930 ug/L of MTBE, and non-detectable levels of <br /> DIPE, ETBE, and TAME The next quarterly groundwater sampling is scheduled for the second quarter <br /> of 1998 <br /> 1 WS lsl Quarter GmundnaWr%Ionnariny Report <br /> aTC PI S\4PLLASANTOMAdmin Task%LL1[RA1-kN\QU1KST0P1112%99rpt]sl do [\ta,_S 10%] <br />