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08 August 2005 i AGE-NC project No 98-0534 Page 13 of 15 the extent of hydrocarbon-impacted ground water in the vicinity of the former LISTS The greatest concentrations"Petroleum hydrocarbon-Impacted soil were j P-9 at a depth of 15 feet bsg and in soil boring P-3 dt a depth of 10 fee encountered m soil boring near the southwest corner of the former UST pit and P-3 is located Table m P-1 S located UST 4 (Figure 2) former UST 1 and High concentrations of TPH-g and TPH-d-Impacted ground water were encountered during advancement of probe borings pI through p10 TPH- j at a maximum concentration of 11,000g was detected In grab ground water samples water samples at a maximum concent atgioln osample,400 p�10,TPH-d ws detected in grab ground compounds were detected at maximum concentrations of 1,600µg/1, 3 1 g ample P�-H2p MTBE and BTEX 1,100 /l, r respectively TBA and ETBE were detected at maximum cons g/l, 1-3 �� µg/1,230µg/1 and ��b 180 µg/1, respectively These initial high grab ground water concentrations ntrations of 42 µg/1 and subsequent ground water monitoring events ns Fere not detected in Since commencement of ground water monitoring the followin g trends can analytical data TPH-g has decreased from a maximum concentration of g�be observed from the detectable concentrations in all m nit1 in a maximum concentration of oring wells as of 06 February µ MW- to non µg/1 in MW-4 to non detectable concentrations bas n all monitoring from wells as of 23 January 2003, benzene was detected on only one occasion at tormg 0 62 µg/1 in MW-6, toluene has decreased from a maximum concentration a concentration of non detectable concentrations in all monitoring wells as of 167 of 1 5 49/1 in T- a maximum concentration of 350 67-- 0o MTBE has decreased from wells as of 06 February µdl in MW-6 to non detectable concentrations in all monitoring MW-6 to non detectabcon entre ions in decreased from a maxrmu cancentratio of 23 99/1 on decreased from a maximum concentration of 24 monitoring wells as of�� OMAr 200 and ETBE has all monitoring wells as of VIJAe 2002 'Monitoring `veI MW-9,in Scredetectable d d f ble concentrations rn bsg at the former UST release area was non detect for hydrocarbons and from 60 feet to 6S feet consecutive monitoring events fuel additives for three Na other petroleum constituents of concern were detected from the ground�, Analytical results of ground water samples are summarized in Table 4 water monitoring events - W General lithology is depicted in cross sectional view In Figure S Selected soil the estimated extent ofpetroleum-impacted soil beneath the site sample locations and In Figure 6 The estimated distribution of adsorbed TPH-g concentrations Side pass sectional view in Figure '7 When the data collected at the site is plotted in both plan view and c posted ti plan view the apparent volume of petroleum impacted soil beneath the site Is approximately rocs sectional view, An adsorbed volume-mass calculation usln 318 cubic yards Using the data collected during UST removal and Aroused GeoERvironm3e[3fai,Inc