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In most of the shallow wells, such as VW-1D and VW-3D the concentrations of TPH, benzene <br /> and other analytes have diminished However, TPH and benzene in samples from well MW-4RS <br /> did not significantly diminish during the SVE remediation, this well is screened from 34 5 to <br /> 49 5 feet bgs <br /> Well MW-4RD is the deepest site well It is screened from 74 5 to 79 5 feet bgs Concentrations <br /> of TPH-g and benzene in samples from this well have ranged from non detect to 21,000 µg/L <br /> TPH-g and 320 µg/L benzene <br /> The recalcitrant concentrations of TPH-g and benzene in wells MW-4RS and MW-4RD indicate <br /> 1 that a mass of hydrocarbon remains below the water table and is not being rapidly degraded by <br /> processes of natural attenuation, nor was it significantly affected by SVE remediation of soils <br /> above the water table <br /> The purpose of this investigation was to sufficiently characterize the contamination and <br /> Ihydrogeology within the saturated zone to identify appropriate approaches to groundwater <br /> cleanup <br /> SaCOP N ITechNbi 12M 1 Ow RodgmiRp&ORISprM 2006 SIR(August)dao <br /> 82308 1-2 <br />