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I i15 October 2002 iAGE-NC Project No 99-0645 iPage 2 of 3 i • Total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g and TPH-d)by EPA Method 8015 Modified for each molecular range of hydrocarbons, and • Benzene, toluene, ethylbenzene and total xylene (BTEX) and methyl tertiary-butyl ether i (MTBE) the oxygenated fuel additives MTBE, tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE) and tertiary amyl methyl ether (TAME), ethanol, methanol, ethyl-dibromlde (EDB) and 1,2- dicholorethane (1,2-DCA) by EPA iMethod 8260 Modified i3.0. FINDINGS i Ground water elevation, flow direction and gradient were determmed from field data collected on 12 July 2002, the contaminant impact to ground water was quantified from the ground water laboratory data i i3 1 GROUND WATER GRADIENT AND FLOW DIRECTION Depth to ground water at the site ranged from 90 90 feet to 9103 feet below the monitoring wells casing tops The ground water elevation in each well was calculated from these data The ground iwater elevations at the site ranged from 45 67 feet(MW-3) to 45 75 feet (MW-1)below mean sea level (MSL), an average decrease of 9 feet from the April 2002 level iThe ground water flow direction and gradient were calculated from the well elevation data The ground water flow was directed toward the northwest at a gradient of 0 002 ft/ft, or 14 feet/mile iFigure 3 illustrates the contoured ground water elevations as measured on 12 July 2002 i32 ANALYTICAL RESULTS OF WATER SAMPLES TPH-g, BTEX compounds, MTBE nor the remaining fuel additives were detected in the water isamples THP-d was detected in the sample collected from well MW-1 at a concentration of 55 micrograms per liter (µg11) iAnalytical results from the ground water samples are summarized in Tables 2 and 3 The laboratory report (MAI Lab ID Numbers 0207202-1 to-3),QA/QC and chain-of-custody are included in iAppendix C iAdvanced GcoEnvironmental,Inc i