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r <br /> 5 <br /> i <br /> 4. SUMMARY 4F RESULTS <br /> 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 September 3, 1997 (Table 1), ATC Associates laic has interpreted the <br /> ' groundwater gradient and flow directions for the upper aquifer, as shown on Figure 3 In the local upper <br /> aquifer (Monitoring Wells MW-5, MW-6 and MW-7), the groundwater level dropped an average of 0 687 <br /> ' feet, ranging from 0 68 feet in Monitoring Well MW-5 to 0 69 feet each in Monitoring Wells MW-6 and <br /> MW-7 The apparent groundwater flow direction in the local upper aquifer is southeasterly at a gradient <br /> of approximately 0 005 (Figure 3) <br /> r <br /> Laboratory analysis of the water sample collected on September 3), 1997 from Monitoring Well MW-5 <br /> indicates that TPH-G and BTEX were not detected in this sample MTBE was detected in the sample <br /> collected from Monitoring Well MW-5 at a concentration of 1,100 parts per billion (ppb) by EPA Method <br /> 8020, and at a concentration of 970 ppb by EPA Method 8260 The next quarterl} groundwater sampling <br /> is scheduled for the fourth quarter of 1997 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> I) <br /> 1 <br /> 7 2nd QUirM Groundu aver\1eneenny Rcport <br /> PI 1\1UUow)12737RI PORTSI3RD Q7 R197 RPT DOC]OL[e6u 29 1997] <br /> r <br />