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SECTION 4 Field Activities and Results This section presents the field activities and results of the Disco Additional Investigation. Analytical results for soil are presented on Table 4-1.Analytical results for groundwater are presented on Table 4-2.Physical soil parameter analyses are presented in Table 4-3. CPT generated boring logs for each boring are included in Appendix A. Laboratory data sheets and a data validation report are included in Appendix B. 4,1 Field Activities The field activities were conducted between December 16 and December 22, 1999;on January 17 and 18,2000;and between March 13 and March 17,2000. The following is a brief account of the CPT boring activities that occurred on the aforementioned dates: • Six CPT borings (CPT-1,-1A, -2, -3,-4, and -5) were installed between December 16 and December 22, 1999, in the former tank and pump area (Figure 4-1) to assess the vertical and lateral extent of petroleum constituents in soil and groundwater directly beneath this area. Borings for lithologic description were installed to the following depths: • CPT-1 was pushed to 88.75 feet bgs. Refusal was encountered at this depth. • CPT-1A was pushed adjacent to CPT-1 to a depth of 95 feet bgs.Refusal was again encountered. • CPT-2,-3,-4 and-5 were all pushed to a total depth of 150 feet bgs. Barings for collection of soil and groundwater samples were installed after the lithologic CPT borings.Sampling depths were agreed upon with Ron Rowe/PHS/EHD in the field after evaluating the lithologic logs. Successful sampling depths for each CPT boring can be found in Tables 4-1 and 4-2. Collection of groundwater samples from between 47 and 48 ft bgs(at the top of the water table)was attempted in borings CPT-3,-4,and--5, however, these attempts were unsuccessful because the borings did not yield groundwater. Groundwater samples were attempted at depths greater than 100 ft bgs in borings CPT-3 and CPT-4,however refusal was encountered at 91 and 95 ft bgs, respectively. • Three borings (CPT-6,-7,and-8)were installed on January 17 and 18,2000, approximately 120 feet south of the site along the shoulder of Highway 4 (Figure 4-1)to assess the downgradient lateral and vertical extent of petroleum constituents in . groundwater. i Borings for lithologic description were installed to the following depths: • CPT-6 was pushed to a total depth of 147 feet bgs • CPT-8 and-7 were pushed to a total depth of 130 feet bgs. 5F=PT REPORT_].DOC/003870036 41