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Results Report - Soil and Ground Water Investigation March 1996 (9647-0011) approved 55-gallon drums and, upon receipt of ground water sample analysis results, will be disposed of in accordance with State and Federal regulations Monitoring well development ' Information is included as Appendix C, Field Documentation Monitoring Well Sampling On February 13, 1996, Fugro purged approximately three ' casing volumes of ground water from each groundwater monitoring well using a new disposal bailer for each well Following purging of the wells, Fugro collected ground water samples, using a new two-tech-diameter disposable bailer for each well Ground water samples from each ' well were transferred Into three VOA-vials for chemical analysis The samples were transported to PACE Inc , and chain-of-custody forms were used to document sample collection and handling procedures Ground water samples were analyzed for TPH-g by EPA Method 8015M and BTEX ' by EPA Method 8020 Ground Water Level Survey Top of casing elevations at each well location were ' surveyed and referenced to an arbitrary benchmark by Fugro personnel The corresponding ground water surface elevations for each monitoring well were determined by measuring the distance from the top of the well casings (known elevation) to the ground water Fugro used the ' survey data to determine the Inferred hydrogeologic flow direction and gradient at the site All development, purging and sampling equipment was decontaminated prior to first use and between sampling locations, as previously described, to minimize Incidental and cross contamination of sampling devices Soil cuttings, development water, purge water, and rinsate water were containerized onsite in DOT-approved 55-gallon drums pending analytical results ' FINDINGS ' Earth Matenals ' Earth materials encountered from grade surface to a depth of 33 5 feet bgs generally consisted of silty clay (CL), silty sand (SM), and clay (CL) Refer to the Log of Drill Holes located in Appendix A ' Soil Assessment Analytical results of collected soil samples are summarized in Table 3, Analytical Results Soil, and the Report of Laboratory Analysis is presented in Appendix B TPH-g was detected 1n soil sample SB-A2 @ 16' at 5,500 parts per million (ppm) and in soil sample SB-A2 @ 21' at 420 ppm Benzene was detected in soil sample SB-A2 @ 16' at 2,200 parts per billion (ppb) and in soil sample SB-A2 @ 21' at 1,600 ppb Soil boring SB-A2 was advanced within the former UST pit location These soil samples were collected below the water table, which was encountered at five feet bgs during drilling 96470411396 3