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r , 22 February 2000 AGE-NC Project No. 98-0481 Page 2 of 7 butanol (TBA), or total lead in soil sample B-1-9.5' (Table 2). Results of the initial site assessment work were presented in a Ietter report to the PHS-EHD, dated 04 December 1998. The letter report included the recommendation that the preliminary site assessment be continued utilizing hollow-stem auger drilling techniques. On 28 January 1999, the preliminary site assessment was continued using a hollow-stern auger drill rig. One soil boring, SB-1, was completed at the former location of the eastern fuel dispenser corresponding to UST removal soil sample S-4-FDe (Figure 3). Soil boring SB-1 was advanced to a depth of 31 feet bsg. There were no reported detections of BTEX, TPH-d, TPH-g, DIPE, ETBE, MTBE, TAME, or TBA in the soil samples collected from soil boring SB-1 at depths of I 1 feet bsg, 26.5 feet bsg, and 31 feet bsg (Table 2). Total lead was detected only in soil sample SB-1-11', and was present at a concentration of 4.7 mg/kg (Table 2). The laboratory analytical report is presented in Appendix A. The soil sample analytical results from soil boring SB-1 indicated that the relatively low levels of petroleum hydrocarbons previously detected in soil sample S-4-Me appear localized and have not significantly migrated. During site assessment activities, soil boring SB-2 was attempted at the former location of the western fuel dispenser corresponding to UST removal soil samples S-4-FDw and S-8-El (Figure 3). However, during the advancement of soil boring SB-2, an active gasoline (super) product line for the operating service station was inadvertently encountered and ruptured. The active product line had not been properly located on the engineer's as-built construction plan. Soil boring SB-2 could not be advanced following the product line rupture. It is estimated that the rupture of the product line resulted in the release of approximately 3.7 to 6.9 gallons of gasoline. Calculation of the volume of the release is presented below. • 23 feet of piping from rupture to dispenser(up-gradient) x 0.16* gal/ft = 3.68 gallons • 40 feet of total piping from UST to dispenser(including the length of piping down-gradient of the rupture) x 0.16* gal/ft = 6.88 gallons *-Volume of 2-inch diameter pipe=0.16 gal/ft On 01 February 1999, during the repair of the product line, AGE collected two soil samples from beneath the area of the product line rupture (Figure 3). The soil samples were collected from soil boring HA-I utilizing a hand-auger and a slide-hammer soil sampler fitted with brass sampling sleeves. Soil samples were collected from boring HA-1 at depths of 6 feet bsg and 7.5 feet bsg. Soil sample analytical results are presented in Table 2. As shown on Table 2, BTEX, TPH-g, and MTBE were detected in soil samples HA-1-6' and HA-1-7.5'. However, TPH-g and benzene were not reported in soil samples HA-1-6' and HA-1-7.5', respectively. The laboratory analytical report is presented in Appendix A. Advanced GeoEnvironmental,Inc.