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03 July 1997 <br /> AGE-NC Project No 95-0130 <br /> Page 2 of 9 <br /> ethylbenzene and xylenes BTE&X) Results of the laboratory analysis indicated that TPH-g <br /> and BTEX were detected in soil samples at concentrations up to 2,200 mg/kg (milligrams per <br /> kilogram or parts per million ppm) <br /> • In December 1994, five soil borings (B-I through B-5) were advanced at the site near the <br /> former UST area Soil borings B-1, B-3 and B-5 were advanced to depths of 35 feet, B-2 <br /> and B-4 were advanced to depths of 65 feet Petroleum hydrocarbon impacted soil was <br /> encountered in all five soil borings from depths between 10 and 65 feet <br /> In January 1995, four additional soil bonngs(MW-1 through MW-3 and B-6) were advanced <br />' at the site near the former UST area Soil boring B-6 was advanced to a depth of 65 feet, <br /> MW-i through MW-3 were advanced to depths of 80 feet and completed as 2-inch diameter <br /> ground water monitoring wells Petroleum hydrocarbon impacted soil was encountered in all <br />' four soil borings from depths between 35 and 65 feet Dissolved TPH-g was detected in initial <br /> ground water samples from all three wells at concentrations up to 11,000 µg/l (micrograms <br /> per liter or parts per billion ppb) <br />' In December 1995, three soil borings (VW-1 through VW-3) were advanced near the former <br /> UST area and one soil boring (MW-4) was advanced downgradient of the former UST area <br /> Soil borings VW-1 through VW-3 were advanced to depths of 63 feet and completed as soil <br /> vapor extraction(SVE)wells using multiple 2-inch diameter PVC casings in each Soil boring <br /> MW-4 was advanced to a depth of 75 feet and completed as a 2-inch diameter ground water <br />' monitoring well Hydrocarbon-impacted soil was encountered in all three SVE wells from <br /> depths of 15 to 60 feet, however, no hydrocarbons were detected in soil samples collected <br /> during the installation of MW-4 <br /> a Dissolved TPH-g was not detected in initial ground water samples collected from MW-4 <br /> However, benzene was detected in MW-4 in later sampling events at concentrations up to 2 8 <br />' ppb <br /> • In January 1996, one soil boring (MSV-5) was advanced upgradient of the former UST area <br /> to a depth of 70 feet Soil boring MW-5 was completed as a 2-inch diameter ground water <br />' monitoring well Petroleum hydrocarbon impacted soil was encountered at depths of 45 and <br /> 50 feet Dissolved TPH-g was detected in initial ground water samples collected from MW-5 <br /> at concentrations up to 23,000 ppb <br /> • An 8-hour soil vapor extraction (SVE) pilot test was conducted at the site in January 1996 <br /> The pilot test was performed to provide vapor extraction data for proper system design of a <br /> remediation system <br /> • In March 1996, a Corrective Action Plan (CAP) was submitted to the PHS-EHD, and <br /> included details of the SVE pilot test Recommendations in the CAP included installation of <br /> an SVE system to remediate hydrocarbon-impacted soil in conjunction with an in-situ air <br /> sparging (IAS) system to remediate hydrocarbon-impacted ground water <br />