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19 November 2009 AGE-NC Project No. 02-0950 Page 3 of 13 commercial and recreational boating, with agricultural usage as a secondary.use. The channel contains water continually and has a potential tidal effect upon ground water depth or flow direction in the area. 2.2. UNDERGROUND STORAGE TANK REMOVAL Two gasoline USTs (1- 500 gallon and 1-1,000 gallon) and one diesel UST (1-2,000 gallon)were removed from the site in December 1986. Additionally, it is AGE's understanding that one 1,000 gallon diesel had previously been abandoned in-place at the site in 1976. Soil samples collected beneath the former UST locations did not detect any petroleum constituents of concern.As a result, the EHD issued a UST closure letter for the above tanks, dated 17 February 1994. On 13 March 2002, two additional 500 gallon gasoline USTs and their associated dispensers and piping were removed from the site under the supervision of the EHD. Removal of the two UST's were documented in a UST removal report (Jim Thorpe Oil Inc), dated 25 April 2002. The approximate location of the former USTs are shown on Figure 2.History of the UST use,tank tests, product inventory and repairs are not known to AGE. Following removal of the tanks, soil.samples (TK1-9 and TK2-10)were collected approximately 2 feet below the former USTs (i.e. 9 to 10 feet bsg). Laboratory analysis of the UST removal soil samples detected total petroleum hydrocarbons as gasoline and diesel (TPH-g and TPH-d) at concentrations as high as 149 milligrams per kilogram (mg/kg) and 4,700 mg/kg, respectively. Purgeable aromatic hydrocarbons (benzene, toluene, ethylbenzene and xylenes; BTEX) were detected at concentrations up to 0.296 mg/kg toluene, 9.15 mg/kg ethylbenzene and 58.5 mg/kg xylenes. In addition, total lead was detected at concentrations up to 45 mg/kg. Analytical results ofUST removal soil samples are summarized in Table 1;UST removal soil sample locations are depicted in Figure 2. 2.3. SITE INVESTIGATIONS The following is a brief summary of the site assessment investigations conducted at the site to date: • On 15 and 16 October 2002, three soil borings (B1, B2 and 133) were advanced on-site to depths of 35 feet bsg for collection of soil and grab water samples.Laboratory analysis of B 1 and B2 soil and grab water samples detected TPH-g, TPH-d and BTEX, while laboratory analysis of B3 soil and grab water samples detected TPH-g and BTEX. The most intense petroleum-impacted soil and water were encountered from boring B2 at concentrations as Advanced GeoEnvironmental,Inc.