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10 June 1998 <br /> AGE-NC Project No 96-0229 <br /> Page 2 of 7 <br /> feet below surface grade (bsg), near the dispenser and UST areas, at concentrations up to 25,600 <br /> parts per million (ppm, reported as milligrams per kilogram) <br /> 2 3 PRELIMINARY SITE ASSESSMENT <br /> Between July and October 1996,nine soil probe bonngs (P-1 through P-9)were advanced to depths <br /> of approximately 40 feet both on-site and off-site Total petroleum hydrocarbons quantified as <br /> gasoline (TPH-g) were detected from soil samples collected from probe borings P-2, P-3, P-4, P-5, <br /> P-7 and P-8 at concentrations ranging up to 7,800 ppm, volatile aromatics (benzene, toluene, <br /> ethylbenzene and xylenes BTE&X) were detected in soil samples collected from all probe borings <br /> at concentrations ranging up to 530 ppm, methyl tertiary butyl ether (M IBE) was detected in soil <br /> samples collected from P-1, P-3, P-4 and P-7 at concentrations ranging up to 0 012 ppm Probe <br /> boring locations are depicted in Figure 2 <br /> Grab groundwater samples were collected from P-1 through P-4 and P-7 through P-9 TPH-g was <br /> detected in all grab ground water samples at concentrations ranging up to 210 000 parts per billion <br /> (ppb, reported as micrograms per liter orµg/l), BTE&X were detected in ground water samples at <br /> concentrations ranging up to 27,000 ppb, MTBE was detected in ground water samples collected <br /> from P-1 through P-4 and P-9 at concentrations ranging up to 1,000 ppb Total lead was detected in <br /> the grab ground water sample from P-1 at 140 ppb <br /> On 18 through 21 November 1997, six ground water monitoring wells (MW-1 through MW-6) were <br /> installed on and off-site as part of ongoing site assessment activities TPH-g was detected in soil <br /> samples collected from MW-1, MW-3 and MW-6 at concentrations ranging as high as 1,500 ppm <br /> BTE&X were detected in samples collected from MWA, MW-3 and MW-6 at concentrations <br /> ranging as high as 140 ppm { <br /> TPH-g was detected in ground water samples collected from MW-1 through MW-6 at concentrations <br /> ranging as high as 150,000 ppb BTE&X were detected in ground water samples from MW-1 <br /> through MW-6 at concentrations ranging as high as 21,000 ppb MTBE was detected in ground water <br /> samples collected from MW-1 and MW-2 at concentrations ranging up to 1,800 ppb TBA was <br /> detected from MW-1 and MW-6 at concentrations ranging up to 320 ppb T AIVIE, UIPE and T o; <br /> were not detected in the laboratory analysis of any ground water samples <br /> 3 0. SCOPE OF WORK <br /> Based on the results of three consecutive ground water sampling events,the installation of additional <br /> ground water monitoring wells is needed to further assess the dissolved petroleum hydrocarbon <br /> Advanced GeoEnvu'onmenlal,Inc <br />