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4-1 4.0 CONCLUSIONS The conclusions of this investigation are based on the results presented in Chapter 3 0 of this report The conclusions have been summarized according to the following • Soil - Former UFT Area • Soil - Former Septic System Leachfield • Shallow Ground Water Site Water Supply Wells The conclusions are presented in the following sections 4 1 SOIL - FORMER UFT AREA Analyses of soil samples collected from borings located in the immediate vicinity of the for- mer UFT (SB-1, SB-2, SB-3, SB-8, SB-9, SB-10, SB-11, SB-12, and SB-13) indicate that the ' soil near the water table has been affected with constituents of gasoline Soil samples were analyzed for TPH-purgeable fuels as gasoline and indicated that TPH concentrations exceed 100 mg/kg in soil samples collected near the water table from each of these borings Con- centrations of BTEX compounds were also elevated in those soil samples Soil samples col- lected from Borings SB-14 and MW-6 were also analyzed, and indicated relatively low con- centrations of ethylbenzene and xylenes (Table 5) These borings are believed to be located near the lateral limits of affected soils Soil samples were analyzed from Borings B-14, MW-4, and MW-5 for TCL VOCs because a former drainage trench in this vicinity was alleged to have received waste oil and solvents These analyses did not detect any TCL VOCs, except for ethylbenzene and xylenes in the sample from Soil Boring SB-14, which can be attributed to the former UFT No evidence of a trench that received waste oil and solvents was found during this investigation Based on gray stainmg (attributed to gasoline constituents) on soil samples and PID screening results observed from the borings (Appendix B), it appears that the main area of soil im- pacted by the former UFT exists at Soil Boring SB-1 (MW-1), SB-2, SB-3, SB-8, SB-9, 29025 "REALISTIC SOLUTIONS FOR HAZARDOUS WASTE PROBLEMS"