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i a a 10 March 2000 , AGE-NC Project No 96-0235 Page 3_of 4 MW=6A,MW-7, MW-8A and MW-10 and was approximately 12 6 feet above the screened interval ' in MW-3, comprising the shallow water data set Figure 3 Illustrates the ground water elevations based on the two data sets Ground water flow direction was calculated to be toward the southwest using data from wells screened within the lower interval-Ground water elevations, based upon data ' ' from the shallow wells indicate a flow toward the north and east ' 32 ANALYTICAL RESULTS OF WATER SAMPLES ' TPH-g was detected in the samples collected from MW-1, MW-2, MW-6B, MW-8B, MW-9 and ; MW-10 at concentrations as high as 18,000 parts per billion(ppb, reported as micrograms per liter) TPH-d was'-detected in 10 of the 12 wells at concentrations as high as 110,000 ppb BTEX ' compounds were detected in seven wells at concentrations as high as 2,000 ppb, 1,500 ppb, 620 ppb and 2,800 ppb, respectively Petroleum hydrocarbons were not detected in the samples collected from MW-4 and MW-6A during the January 2000 monitonng'event BTEX were not detected in the ' sample collected from MW-5, MW-7 and MW-8A Low concentrations of hydrocarbons were detected in five wells where hydrocarbons were not detected during the previous monitoring event Y ' MTBE was detected in the water samples collected from MW-9 and MW-10 at concentrations of 130 ppb and 17 ppb, respectively Other oxygenates were not detected during the January 2000 ' monitoring event Analytical results of water samples collected In January 2000 are summarized on Table 2, analytical results of all historical water samples collected at the site are summarized on Tables 3 and 4 The laboratory report (MAI Sample Nos 29625-29636), chain-of-custody forms and the laboratory QA/QC report are included in Appendix B 4.0. SUMMARY AND CONCLUSIONS Based on the data collected from the former UST No 3 area, AGE finds I • Ground water in MW-1, MW-2, MW-613 and MW-813 does not appear to be in direct 4hydraulic communication with the ground-water,in MW-4, MW-5;MW-6A, MW-7 and F LL I MW-8A Monitoring well MW-3, screened from 30 to 55 feet bsg may be in hydraulic communication with all wells at the site • Ground water flow within the lower monitored interval was toward the southwest, ground ' water flow in the upper interval was toward the north and east • Thegreatest concentrations of hydrocarbons in ground water were detected in wells MW-I ' and IMW-2 Impacted deeper ground water appears to be centered in the area near MW-2 and . -MW-1 Advanced GeoEnvironmental,Inc i I4 i