Laserfiche WebLink
4-1 <br /> 1 <br /> • 4 <br /> . SUMMARY OF RESULTS <br /> A summary of the analytical results s from current and past well sampling is presented in Table 1 Based <br /> on the water-level data for June 8, 1998 (Table 1), ATC Associates Inc has interpreted the groundwater <br /> gradient and flow directions for the upper aquifer, as shown on Figure 3 In the local upper aquifer <br /> (Monitoring Wells MW-5, MW-6 and MW-7), the groundwater level decreased from the previous quarter <br /> an average of 0 75 feet, ranging from 0 62 feet in Monitoring Well MW-7 to 0 81 feet in Monit <br /> oring Well <br /> MW-5 The apparent groundwater flow direction in the Iocal upper aquifer is southeasterly at a gradient <br /> of approximately 0 002 (Figure 3) <br /> Based on the water-Ievel data for June 8, 1998 (Table 1), ATC Associates Inc has interpreted the <br /> groundwater gradient and flow directions for the lower aquifer, as shown on Figure 4 In the local lower <br /> aquifer (Monitoring Wells MW-1R, MW-2, MW-3 and MW4), the groundwater level decreased from the <br /> previous quarter an average of 0 85 feet, ranging from 0 81 feet in Monitoring Well MW-IR to 0 93 feet <br /> in Monitoring Well MW-3 The apparent groundwater flow direction in the local lower aquifer is <br /> southerly to southeasterly at a gradient of approximately 0 001 (Figure 4 <br /> g ) <br /> Laboratory analysis of the water sample collected on June 8, 1998 from MW-1R, MW-2, MW-3, MW-4, <br /> MW-5, MW-6 and MW-7 indicates that TPH-G and BTEX were not detected in any groundwater <br /> samples Laboratory results of the analysis for the fuel oxygenate compounds by EPA Method 8260 <br /> showed MTBE was detected in the groundwater samples collected from Monitoring Wells MWAR [23 <br /> parts per billion (ppb)], MW-2 (6,600 ppb) and MW-5 (1,600 ppb) In addition, non-detectable levels of <br /> TBA, DIPE, ETBE, and TAME were present in all groundwater samples The next quarterly groundwater <br /> sampling is scheduled for the third quarter of 1998 <br /> 1999 Ist Quaner Groundwater Monflonng Repon <br /> ATC pLS ULEASANTOMAdmin Task\LEHRMAMQUIK5T0P113Za9rp1 2nd doc[July:D 199&] <br />