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Site Background Information: Cherokee Truck Stop AGE-NC Project No. 97-0312 Page 5 of 9 as 0.057 mg/kg. Toluene was detected in sample B21-10 at a concentration of 0.091 mg/kg. Ethylbenzene and xylenes were not detected in the soil samples analyzed from the September 1999 drilling. MTBE was detected in three of seven soil samples analyzed by EPA Method 8260 at concentrations as high as 2.7 mg/kg. Other oxygenates were not detected. • 30 July 2002 - Ground water monitoring well UST-1 was destroyed by over-drilling to total depth. Following over-drilling,the boring was backfilled to surface grade with portland cement in accordance with EHD regulations. • 06 December 2002 - One ground water monitoring well (UST-7) was installed to a depth of 90 feet bsg; the well screen of UST-7 was recorded as placed between 85 feet and 90 feet bsg. Soil samples were collected at 25 feet bsg and 45 feet bsg. The physical properties of soil samples MW7A-25 and MW7A-45 were described as a brown silt and a brown clay with specific gravity of 2.76 and 2.75, permeability of 6.2 x 10' and 8.4 x 10', porosity of 49.96% and 43.99°/x, pH of 7.6 and 7.5, and total organic content of 1.8% and 2.2%, respectively. Tetrachloroethene was detected in the ground water sample collected from UST-7 at a concentration of 1.3 pg/I. No other analytes of concern were detected. • 07 September 2005 - Ground water monitoring wells UST-8 and UST-9 were completed using 2-inch diameter polyvinylchloride (PVC)casing; 0.020-inch slotted screen was installed from approximately 65 feet to 75 feet bsg in well UST-8, and from approximately 95 feet to 105 feet bsg in well UST-9, with blank casing extending to the surface in both borings. Generally, clayey silt was encountered to 70 feet bsg and silty and sandy soil (sandy silt, silty sand, and sand) were encountered in the borings to 105 feet bsg(total depth of UST-9). TPH-g and TPH-d were detected at concentrations ranging from 1.7 mg/kg (UST9-100) to 320 mg/kg (UST9-25)and 14,000 mg/kg (UST8-10 and UST9-25)to 16,000 mg/kg (UST9-10), respectively in the soil samples collected from UST-8 and UST-9. BTEX constituents were also detected in the soil samples UST9-10, UST9-25, UST9-90 and UST9-100 with maximum concentrations found in sample UST9-25 at 2.6 mg/kg benzene, 83 mg/kg toluene, 41 mg/kg ethylbenzene and 247 mg/kg total xylenes. • December 2005 - All monitoring wells were re-designated with a preceding MW instead of UST to normalize the well identifications. • 22 December 2006 - A Cone Penetrometer Testing (CPT) Report was completed. The advancement of the two CPT soild boring groups, CPT-1 and -2, were complete on 24 April 2006. Each advancement event collected two grab ground water samples. CPT-1 collected grab ground water samples at 66 feet and 103.5 feet.The only analyte found was in the 66 foot sample, 190 tag/I of 1,2- Dichloroethane. CPT- 2 recorded no detections above the sampling detection limit. Advanced GeoEnvironmental,Inc.