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1 <br />` 21 September 2000 <br />' AGE-NC Protect No 99-0624 <br /> Page 3 of 4, <br />' 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />' Petroleum hydrocarbons quantified as TPH-g were detected in ground water samples collected from <br /> all four monitoring wells MTBE was detected in ground water samples collected from monitoring <br /> wells MW-2 and MW-3 <br />' TPH- was detected at concentrations as high as 8 900 micrograms per liter I in samples <br /> g � � � p (µ� ) p <br /> collected from MW-2 Benzene and xylene compounds were detected at concentrations as lugh as <br />' 1,000 µg/1 and 1,700 µg/1 from MW-2, respectively <br /> MTBE was detected in monitoring wells MW-2 and MW-3 at concentrations of 16,000 gg/l and 4 4 <br />' µg11,respectively MTBE concentrations Increased in MW-2 from 130 pg/1 to 16,000 µg/l,between <br /> the 16 November 1999 and 17 May 2000 monitoring events <br /> Based on the large increase In MTBE concentrations detected In MW-2, AGE requested a UST <br /> system "Liquid Status Report" On 31 May 2000 a Liquid Status Report was performed on the <br /> system The report indicated that the pump pits and annular tested, "sensor normal" AGE was <br /> informed that the equipment was tested in October 1999, and was working properly <br />' Analytical results of the ground water samples for the second quarter - 2000 monitoring event are <br /> summarized on Table 2 The laboratory report (MAI Laboratory ID 38390-38393), QA/QC and <br /> chai-n-of-custody are included in Appendix B A copy of the Liquid Status Report from 31 May 2000 <br /> Iis included In Appendix B I <br /> I4.0. SUMMARY/CONCLUSIONS <br /> The following conclusions were drawn from the results of the site investigation <br /> • The average ground water elevation on 17'May 2000 from monitoring wells on-site was <br /> approximately 48 feet below surface gradc and 9 50 feet below MSL <br /> • The Inferred ground water gradient on 17 May 2000 was calculated to be 0 004 ft/ft toward <br /> the south, and was consistent with the data collected from the previous monitoring event <br />' • TPH-g was detected in ground water samples from all four monitoring wells on-site with the <br /> highest concentrations from samples collected from MW-2 A significant increase in TPH-g <br /> concentration has occurred In MW-2, located between the USTs and fuel island area The <br /> data also suggests that the TPH-g-impact to ground water extends laterally to the north and <br /> west as far as MW-4 and MW-1, respectively <br /> I ' BTEX compounds were detected in the water samples collected from all four monitoring <br /> Advanced GeoEnvxronrnentai,Inc <br />