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20 March 2002 <br /> • AGE-NC Project No 95-0144 <br /> ' Page 2 of 7 <br /> Four soil probe borings (probings GP5 to GP8) were advanced near the former location of UST <br /> ' No 1,a 250-gallon waste oil tank Petroleum hydrocarbons were detected in a soil sample collected <br /> from a depth of 15 feet bsg directly below the former UST location Petroleum hydrocarbons were <br /> not detected at depths of 20 and 25 feet bsg below the former UST No 1 nor in samples collected <br /> from three probmgs approximately 15 feet from the former UST location Hydrocarbons were not <br /> detected in a grab ground water sample collected from beneath the UST location <br /> Four probe borings (GP9 to GP 12)were advanced near the former location of UST No 2, a 1,000- <br /> gallon waste oil tank Analytical results and field observations indicated that soil and water in the <br /> ' vicinity of UST No 2 were not adversely effected by the operation of the UST Details of the soil <br /> investigation were described in the Quarterly Report -June 1995 prepared by AGE <br /> Between September and November 1995, monitoring wells MW-11,MW-12,MW-13 and MW-18 <br /> ' were installed at the site Petroleum hydrocarbons were not detected in the analyzed soil samples <br /> collected during advancment of the pilot borings Procedures and results were summarized in <br /> Quarterly Report -December 1995 prepared by AGE <br /> In January 1996, two in-situ air sparging wells (IAS-1 and IAS-2)were installed at the site An in- <br /> situ air sparging (IAS) pilot test was performed at the site in February 1996 Increased induced <br /> pressure, organic vapor, ground water elevation and dissolved oxygen were generally measured at <br /> monitoring wells throughout the test Procedures and results were summarized in the Corrective <br /> Action Plan -February 1996 prepared by AGE <br /> In June 1998, three dual-completed wells (MW-19, MW-20 and MW-21) were installed near the <br /> former UST No 8 Petroleum hydrocarbons were detected in soil samples collected from pilot <br /> borings MW-19 and MW-21 Procedures and results were summarized in Quarterly Report-August <br /> 1 1998, dated 08 December 1998, prepared by AGE <br /> In March 2001, two ground water extraction wells (EW-1 and EW-2) were installed at the former <br /> UST No 8 location Additionally, approximately 110 cubic yards of petroleum hydrocarbon- <br /> impacted soil were excavated from the former UST No I (waste oil) area Soil samples were <br /> collected from the floor and sidewalls of the excavation and from the stockpiled soil Total <br /> 1' petroleum hydrocarbons quantified as gasoline (TPH-g), diesel (TPH-d) and motor oil (TPH-mo) <br /> were detected in samples collected from the stockpile Toluene was detected in the sample collected <br /> from the south wall at a concentration of 0 016 mg/kg TPH-d was detected in the floor sample at <br /> ' a concentration of 1 1 mg/kg No other petroleum hydrocarbon contamination was detected in the <br /> five soil samples collected from the excavation Procedures and results were summarized in <br /> Quarterly Report -First Quarter 2001, dated 23 May 2001,prepared by AGE <br /> Advanced GeoEnvironmental,Inc <br />