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_ Cr ,1" 15 February 2000 AGE-NC Project No 98-0448 Page 2 of 33 Environmental Investigation, dated 28 July 1994 by John P Cummings &Associates) Analytical results of soil samples collected during the UST removal are summarized in Table 1 23 PREVIOUS INVESTIGATION The following is a bnef summary of site assessment activities following the UST removal • In June 1994, one soil boring(B-T) was advanced near the center of the former UST area to a depth of 35 feet bsg Laboratory analysis of soil samples collected between 11 and 35 feet bsg detected TPH-g concentrations as high as 14,000 mg/kg, volatile aromatic compounds benzene,toluene, ethylbenzene and xylenes (BTEX)were detected at concentrations as high as 1,200 mg/kg A grab ground water sample collected from B-T contained TPH-g at 3,300 micrograms per liter (ug/1) and toluene at 290 µg/1 Analytical results of soil samples are summarized in Table 1, analytical results of the grab ground water sample are summarized in Table 2 • In October 1994, six soil borings (B-1, B-2,B-3,MW-1,MW-2 and MW-3) were advanced at the site to Investigate petroleum hydrocarbon-impact near the former UST area, ground water monitoring wells were Installed in MW-1, MW-2 and MW-3 Laboratory analysis of soil samples collected from B-2,MW-1 and MW-2 detected TPH-g at depths between 20 and 30 feet bsg at concentrations ranging as high as 1,900 mg/kg, BTEX compounds were detected from MW-1, MW-2, MW-3 and B2 at concentrations as high as 71 mg/kg Initial ground water samples collected from MW-1, MW-2 and MW-3 contained TPH-g at concentrations as high as 97,000µg/1 and BTEX compounds at concentrations ranging as high as 23,000µg/1 Analytical results of soil samples are summarized in Table 1, analytical results of ground water samples are summarized in Table 2 • In July and August 1998, five soil borings/ground water monitoring wells (MW-4A MW-' 4B, MW-5, MW-6 and MW-7) were installed at the site,to further assess the petroleum hydrocarbon-impact Laboratory analysis of soil samples collected from MW-4 detected TPH-g at depths between-35 and 50 feet bsg at concentrations ranging as high as 9 5 mg/kg, - BTEX compounds were detected at concentrations ranging as high as 0 56 mg/kg Initial ground water samples collected from MW-4A, MW-413,MW-5,MW-6 and MW-7 detected TPH-g at concentrations as high as 110,000 µill and BTEX compounds at concentrations as high as 25,000 ag/l Analytical results of soil samples are summanzed in Table 1, analytical results of ground water samples are summarized in Table 2 • In June 1999, one ground water monitoring well (MW-8)was installed at the site to further assess the petroleum hydrocarbon-Impact, one ground water extraction well (EW-1) was installed to compliment' a ground water pump test Laboratory.analysis of soil samples collected at 25 feet bsg from EW-1 detected TPH-g and BTEX compounds at concentrations ' Advanced GeoEmlronmentai,Inc I �