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08 September 2009 AGE -NC Project No. 03-1055 Page 5 of 19 concentrations of 160 mg/kg, 1.2 mg/kg, and 2.48 mg/kg, respectively. Benzene and toluene were reported in soil sample B 11-15 at maximum concentration of 0.039 mg/kg and 0.026 mg/kg, respectively. • April and May 2008 - Two on-site soil borings were advanced and completed as two-inch ground water monitoring wells. On-site borings, MW 12 and MW 13 were advanced to total depths of 22 feet bsg and 35 feet bsg, respectively. No analytes were reported in any of the soil samples analyzed from MW 13; soil samples were not collected from MW 12. Two off-site soil borings were advanced and completed as two-inch ground water monitoring wells. Off-site borings, MW 11 (west sidewalk of Adams Street) and MW 14 (cast sidewalk of Adams Street) were advanced to total depths of 22 feet bsg and 35 feet bsg, respectively. TPH-g, TPH-d, and ethylbenzene were reported in boring MW 11 at a maximum concentration of 71 mg/kg (MW 11-22), 400 mg/kg (MW 1 l -22), and 1.2 mg/kg (MW 11-10), respectively. No additional analytes were reported at or above the laboratory detection limits in the samples analyzed. Procedures and results of the well installations are presented in the AGE -prepared Additional Site Assessment Report, dated 03 July 2008. Historical analytical results of soil and grab ground water samples are summarized in Tables I and 2, respectively. 2.3. ADJACENT SUBSURFACE INVESTIGATIONS A LUST investigation was performed at 103 West l I" Street (former Chevron Service Station), which is located approximately 40 feet west of the former Tracy Diner property. The following information was obtained from review of public records for the subject property: • December 1991- Chevron completed and submitted an unauthorized release (UAR) for the subject property. • January 1992 - One waste oil UST was removed from the northern portion of the site; significant petroleum hydrocarbon impact to soil and ground water was reported. Consequently, the site was placed in the EHD local oversight program (LOP) and a directive was issued for further site assessment. • November 1992 - Monitoring wells MW -1 through MW -3 were installed on-site and a quarterly ground water monitoring program was initiated. These wells were non -detect for petroleum hydrocarbons; however, these wells were located cross gradient and up -gradient of the UST area. • July 1993 -Eight USTs were removed from the subject property: two 10,000 -gallon gasoline USTs and one 5,000gallon gasoline UST, all located in a common excavation (common UST Advanced GeoEnvironmental, Inc.