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In a Ietter dated November 12, 1993, the PHS/EHD I resen3ted three options for the investigation of residual contamination at the site. One option was to drill and sample two borings and complete four consecutive quarters of groundwater analyses with no detectible constituents. I 3.0 SCOPE OF WORK To investigate the possibility of further soil contamination at the site, GeoAudit proposes to drill two soil borings in the vicinity of the former UST loclation. Figure 3 shows the proposed location of these borings. Soil samples and auger returns will be screened for evidence of contamination as drilling proceeds. The depth to first groundwater at the site is currently approximately 11 feet in monitoring wells located on-site. Quarterly monitoring was performed on January 3, 1994. The proposed assessment procedures are itemized below: 1) Notify the PHS/EHD at least 48 hours prior to field work. 2) Drill two soil borings using truck-mounted,continuous-flight,8-inch diameter hollow- stern augers. i 3) Obtain discrete soil samples at depths of 12.5, 15, 117.5 and 20 feet, using a split- spoon sampler loaded with three brass sample tube's. 4) Decontaminate sampling equipment in a tri-sodium phosphate solution (TSP) and rinse twice with water prior to each sampling run. II i 5) Preserve soil samples in the lower brass tube by covering both ends with aluminum foil, capping, and sealing with tape. b) Label and log soil samples on a chain-of-custody form. 7) Store samples under ice pending delivery to a stateI,certified laboratory. i 8) Monitor auger returns and soil sample duplicates for the presence of volatfle organics using a photo-ionization detector (PID). 9) Log auger returns and soil samples in the middle and upper brass tubes in accordance with the Unified Soil Classification System. 10 Place soil cuttings on plastic sheeting and store on-site riding analytical results. V 11) Steam clean augers between borings to prevent cross contamination. I i I r