ARCHIVED REPORTS XR0012973 - Laserfiche WebLink

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SW 08 September 2009 AGE -NC Project No. 03-1055 Page 10 of 19 A UST reportedly operated on-site for approximately 30 years, from 1940 until 1970; it is assumed the UST was removed after 1970. Four soil borings (B 1 through B4) were advanced for the collection of soil samples in the former UST and dispenser areas in May 2000. TPH-g were reported in five of the eight analyzed soil samples at concentrations ranging between 3.6 mg/kg and 340 mg/kg. One or more BTEX compounds were reported in three of the eight analyzed samples at maximum concentrations of 0.11 mg/kg benzene, 0.47 mg/kg toluene, 0.27 mg/kg ethylbenzene, and 0.40 mg/kg xylenes. The highest concentrations of impacted soil appeared to be in the area of baring B3, beneath the northernmost former dispenser. Soil samples collected as part of this investigation indicated an unauthorized release of hydrocarbons had occurred at the site. In November 2000, seven soil samples were analyzed from pilot soil borings MW t through MWS. Constituents were only reported in samples collected from pilot borings MW2 and MW3, with the highest concentrations of TAH -g at the site reported in MW2. TPH-g were reported in sample MW2-15 at concentration of 2,300 mg/kg; pilot boring MW2 was located west of the northernmost former dispenser area (133). In October 2003, during soil excavations activities, a 500 -gallon UST was discovered near the sidewalk along the western wall of the excavation. Four soil samples were collected from beneath the 500 -gallon UST in November 2003; lead was reported in all samples at concentrations ranging 1 W between 8.6 mg/kg (UST -3) and 14 mg/kg (UST4). TPH-g and TPH-d were only reported in sample UST4 at concentrations of 39 mg/kg and 120 mg/kg, respectively. Soil samples collected as part of this investigation indicated an additional unauthorized release of hydrocarbons had occurred at the site. In July 2003, borings B6 through B9 were advanced along eastern (136, B7 and 138) and wester (B9) Adams Street; TPH-g were reported in all four samples analyzed at concentrations ranging between 17 mg/kg (138-13) and 72 mg/kg (137-13). All samples were collected between depths of 12 feet and 13 feet bsg, from within the saturated zone. In July 2004, five soil samples were analyzed from pilot soil borings MW6 and MW7. Constituents were only reported in samples collected from pilot boring MW6; TPH-g and TPH-d were reported in sample 136-15H at concentrations of 3.5 mg/kg and 37 mg/kg, respectively. Pilot boring MW6 was located near the northeast comer of Adams Street and I I" Street, upgradient from the former Tracy Diner UST areas. Pilot boring MW7 was located down -gradient of the site's former UST areas. In June 2005, six soil samples were analyzed from pilot soil borings MWS through MW10. Constituents were only reported in one sample collected from pilot boring MW9; TPH-g were reported in sample MW9-15 at a concentration of 20 mg/kg. Pilot boring MW9 was located down - gradient of the former Tracy Diner's UST areas from within the saturated zone. In September 2007, borings B 10, B 11 and B 13 through B 15 were advanced along the center of Advanced GeoEnAronmental, Inc.