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Weldon Church Site Background Information Page 3 of 12 SITE ASSESSMENT ACTIVITIES Six soil probe borings were advanced at the site on 20 December 1996. Soil and water samples were collected at discrete depth intervals from the majority of the probe borings. Figure 2 depicts the locations of the probe borings. TPH-g was detected in three of the soil samples analyzed at concentrations as high as 2,800 mg/kg (P3-6). BTEX compounds were detected in the same three samples at concentrations as high as 93 mg/kg (total xylene, P1-6). The maximum benzene concentration detected was 2.8 mg/kg (P1-6). TPH-g was detected in grab water samples at concentrations as high as 210,000 pg/I (P1). BTEX compounds were also detected in four of five grab ground water samples at concentrations as high as 35,000 pg/I (toluene P6). The maximum benzene concentration detected was 12,000 pg/I (P6). The installation of the soil probe borings was summarized in the PIER prepared by AGE, dated 10 September 1996. Between July 1996 and April 1998, a total of six wells were installed on the site and surrounding properties in order to determine the lateral and vertical limits of the dissolved hydrocarbon plume. In July 1996, four soil borings were drilled and completed as 2-inch diameter ground water monitoring wells with slotted screens from approximately 5 to 25 feet bsg (wells (MW-1 through MW-4). In April 1997, soil borings B5 (MW-5) and B6 (MW-6) were drilled and completed as ground water monitoring wells. Monitoring well MW-5 was completed using a 2-inch diameter PVC casing with a slotted screen from approximately 3 to 10 feet bsg. Ground water monitoring well MW-6 was dual-completed with screen intervals installed from a depth of 20 to 23 feet bsg and 3 to 13 feet bsg. The installation of the first four monitoring wells was summarized in the PIER prepared by AGE, dated 10 September 1996. On 07 May 1998, soil borings B13, B14, and B15 were advanced manually and one boring was completed as a ground water monitoring well. Borings B13, B14 (MW-7), and B15 were established on the property at 52 West Beverly Place. On 09 and 10 June and 26 August 2003, nine soil probe borings (1316 through B24) were advanced on- and off-site. Seventeen soil samples were analyzed; TPH-g and various BTEX compounds were detected in samples B17-5, B18-10, and B20-8 at maximum concentrations of 15 (mg/kg) TPH-g (1320-8), 0.52 mg/kg benzene (1318-10), 0.18 mg/kg toluene (1317-5), 0.24 mg/kg ethylbenzene (1317-5), and 2.15 mg/kg xylenes (1317-5). Xylenes were also detected in Advanced CcoEnvironmental,Inc.