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r� <br /> ased on the original spill volume (60 <br /> soil remain in place bhydrocarbons removed by excavation (15-20 g) <br /> g) , the volume r <br /> and the concentrations of the residual soils. <br /> rial to <br /> The excavation pit was backfilled with clean fill <br /> esamples <br /> ,,litigate any potential physical hazards. Soil <br /> and MV11, which <br /> collected during the drilling of boring <br /> are both located oa testable petrol on hydrocarbonsf the :former . <br /> locations, <br /> contained <br /> The removal of the tank and the subsequent excavation of <br /> roundwater <br /> impacted soils have effectively potential remeforhPfuturefl gant source <br /> and greatly reduced the p <br /> soils <br /> contamination. The relatively small volumeoff ase afsigndificant <br /> ect <br /> remaining in place would not appear tori sons: <br /> threat to groundwater for the following <br /> 1} The affected soils are underlain by elastic <br /> silts and lean to fat clays. The frrationynod <br /> soils would act to retard mig <br /> contaminants and reduce- theg leachabof <br /> ation of <br /> the soils thereby <br /> contaminants, <br /> 2) The primary contaminants of concern are high <br /> boiling point or heavy hydrocarbons (diesel) <br /> which tend to have limited mobility in the <br /> vadose. zone and are known to degrade naturally <br /> over time. <br /> 2, 1991, <br /> hydrocarbons. A confirmation <br /> A groundwater sample collected from well Mw1 on May <br /> detected no dissolved petroleum by confirmed the <br /> groundwater sample collected on August 2, 1991, that <br /> in the wel , <br /> lindicating <br /> 1 <br /> absence of contaminants been impacted by the <br /> groundwater beneath the site has not tank. <br /> former leaky underground fuel storage <br /> 6 <br /> SFSGH815.�A <br />