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I November 2005 AGE:-NC Project No. 97-0327 Page 2 of 8 2.1 SITE DESCRIPTION AND USAGE The site currently operates as a retail fueling facility with a mini-market and car wash; it has been owned by Balbir S. Grewal and Rick Grewal since approximately 1986. It is AGE's understanding that an automobile repair and/or fueling facility had previously existed on this property for approximately 38 years (circa 1966). 2.2 UNDERGROUND STORAGE TANK REMOVAL In July 1998, one 10,000-gallon gasoline, one 6,000-gallon gasoline and one 6,000-gallon diesel USTs were removed from the site and replaced with two 12,000-gallon gasoline/diesel USTs. Laboratory analysis of soil samples collected beneath the former USTs and product piping areas detected total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d. respectively)at concentrations as high as 12.000 milligrams per kilogram(mg/kg);benzene,toluene, ethylbenzene and xylenes(BTEX compounds)were detected at concentrations as high as 290 mg/kg; and methyl tertiary butyl ether(MTBE) and tert-butanol (TBA) were detected at concentrations as high as 0.80 mg/kg. 2.3 SUBSURFACE INVESTIGATIONS The following is a summary of previous site investigations of the unauthorized release of fuel products to the subsurface; boring and monitoring well locations are depicted in Figure 2: • May 1997- Five soil borings(P-1 through P-5)were advanced near the former UST area to assess the lateral and vertical extent of petroleum-impacted soil as part of preliminary site assessment; results of the May 1997 investigation were reported in the AGE-prepared Preliminary Site Assessment, dated 06 June 1997. Xylenes were detected in boring P-4 (30 feet bsg)at a concentration of 0.026 mg/kg;MTBE was detected from soil samples collected in borings P-3 (25 feet bsg), P-4(30 feet bsg)and P-5 (25 feet bsg) at concentrations as high as 0.28 mg/kg. The laboratory analysis did not detect any other petroleum constituents. Soil data analytical results are summarized in Table 1. • June 1999 - Four additional soil borings (P-6 through P-9) were advanced at the site; the results were reported in the AGE-prepared Preliminary Investigation and Evaluation Report, dated 27 September 1999. Laboratory analysis of the 40 foot P-8 soil sample detected significant TPH-g at a concentration of 340 mg/kg, TPH-d at 37 mg/kg and BTEX compounds at concentrations as high as 20 mg/kg; a grab water sample from P-8 detected TPH-g and TPH-d at concentrations of 1,900 micrograms per Iiter(µg/l),BTEX compounds as high as 310 pg/1 and MTBE at 52 gg/l. Residual BTEX compounds and MTBE were Advanced GeoEnviroomental,Inc.