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# A S S O C I A T E S I N C limits. Composite samples of the stockpiled excavated soil were collected and analyzed for TPHg, BTEX, and methyl tert-butyl ether (MTBE). Because laboratory results did not detect any of the analytes above the laboratory detection limit, the stockpiled soil along with clean pea gravel ,and Class AIB subbase was used to backfill the excavation. Figures showing the location of soil:samples collected and tabulated laboratory analytical data, as presented in Helmick and Lerner's work plan, are presented as Attachment I of this report. On February23 and 24 1999 ATC supervised the advancement of four soil borings SB6 SB7 P g � , SB8, and SB9) in the vicinity former gasoline USTs (Figure 4). Drilling was conducted utilizing a hollow stem auger drill rig. Soil borings SB6 through SB8 were advanced and sampled to 36.5 feet bgs. Soil boring SB9 was advanced and sampled to 41.5 feet bgs. Of the fourteen soil samples collected from soil borings SB6, SB7, SB8, and SB9, none were reported by the laboratory to contain TPHg, BTEX, or fuel oxygenates above laboratory detection limits. Analytical results of soil samples are summarized in Table 1. In correspondence dated June 25, 1999, PHS/EHD requested additional work at the site to further.define the lateral extent of diesel contamination in the vicinity the former diesel USTs. METHODS AND PROCEDURES To further define the lateral extent of diesel petroleum hydrocarbons in the vicinity of the former diesel USTs, a total of two (2) angled soil borings were advanced at the site. These soil borings were placed east of the former diesel USTs in the vicinity of SB-3. All field activities were performed in accordance with ATC's Work Plan for Supplemental Investigation dated August 30, 1999. Additionally, the work was performed under ATC's Site Safety Plan and Quality Assurance/Quality Control Plan (QA/QC Plan) submitted to PHS/EHD on February 1, 1999, Soil Borina Advancement and Sampling On September 23, 1999, ATC supervised the advancement of two soil borings (GPI and GP2) in the immediate vicinity of the former diesel UST locations. Drilling activities at the site were performed by V & W Drilling (State C57 license no. 720904) utilizing a truck mounted Geoprobe® rig employing DPT. The two soil borings were completed at depths of approximately 26 feet bgs and advanced at an approximate angle of 30 degrees from vertical. Soil samples were collected from the two borings at four-foot intervals in acetate sampling tubes and described according to the Unified Soil Classification System. The soil samples and any drill cuttings were characterized for soil type, moisture content,.and visual evidence of petroleum hydrocarbons. Soil boring locations are shown.on Figure 5. wA172921r ortslSu Ilnvest.doc eP PP 3 i, I