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r 07 April 1999 AGE-NC Project No 96-0235 Page 3 of 5 ; Ground water flow direction was calculated toward MW-2 using data from wells screened within ' the lower interval Ground water elevations,based upon data from wells screened across the current ground water surface, indicate a divergent flow toward the southwest and southeast The Inferred ground water flow directions do not correspond with the prevailing historical flow direction observed ' at the site 32 ANALYTICAL RESULTS OF WATER SAMPLES ' TPH-g was detected in MW-1 and MW-2 at concentrations of 1,400 parts per billion (ppb, reported as micrograms per liter) and 21,000 ppb, respectively Benzene was detected in the same wells at concentrations of 28 ppb and 1,800 ppb, respectively TPH-d was detected in MW-1 and MW-2 at ' concentrations of 71 ppb and 760 ppb, respectively Toluene, ethylbenzene, and xylenes were detected In the same wells at concentrations ranging from 3 &ppb to 3,000 ppb Toluene and xylenes were detected in MW-3 at concentrations of 0 45 ppb and 0 85 ppb, respectively Benzene, toluene ' and xylenes were detected in MW-6B at concentrations of 0 4 ppb 0 91 ppb and 13 ppb, respectively Benzene was detected in MW-7 at a concentration of 0 86 ppb Petroleum hydrocarbons 'M were not detected in the samples collected from MW-4, MW-5, MW-6A, MW-8A or MW-8B Tertiary butanol was detected in MW-2, and MW-6B at concentrations of 15 ppb and 7 1 ppb, ' respectively Oxygenated compounds were not detected in remaining samples collected from the site during the February 1999 monitoring event Analytical results of all water samples collected at the site are summanzed on Tables 2 and 3 The laboratory report (AAL Batch No 99-0211-014), chain- of-custody forms and QA/QC are included in Appendix B 4 0 SUMMARY AND CONCLUSIONS Based on the data collected from the site, AGE finds • Petroleum hydrocarbons were detected in MW-1 and MW-2, both screened approximately -- ' 23 feet below the current ground water surface, at the historical ground water depth Only low concentrations of hydrocarbons were detected in MW-3 and MW-6B and hydrocarbons were not detected in MW-8B, all screened near the historical ground water depth, defining ' the lateral extent of impacted ground water at this depth toward the west, northwest and north r ' • Petroleum hydrocarbons were not detected in MW-4, MW-5, MW-6A or MW-8A, screened • at the current ground water surface, limiting the lateral extent of impacted shallow ground toward the west, north and east at the current ground water elevation Advanced GeoEm ironmental,Inc