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1 $NC <br /> The excavation of the hydrocarbon contaminated soil will remove the highly contaminated <br /> soil from the surface to a depth of approximately 35 feet below ground surface The <br /> overexcavation will also possibly allow the determination of the vertical and horizontal extent <br /> of hydrocarbon contaminated soil <br /> A map of the location of the proposed excavation boundaries is depicted as Exhibit 4 The <br /> boundary of the excavation depicted on Exhibit 4 may change as the distribution of the <br /> ' hydrocarbon contaminated soil is determined The excavation is not anticipated to achieve <br /> a depth of greater than approximately 35 feet below ground surface If it is determined that <br /> 1 additional vertical delineation of the hydrocarbon contaminated soil must be made then the <br /> completion of the vertical definition of the hydrocarbon contaminated soil will be made by <br /> ' exploratory soil boring after the excavation has been backfilled <br /> Task 2 2 Soil Sampling <br /> Soil samples will be collected from the working floors and sidewalls from the excavation to <br /> ' characterize the soil contamination and map its subsurface distribution Once all <br /> hydrocarbon contaminated soil has been removed from the excavation or the hydrocarbon <br /> contaminated soil has been removed from the excavation to the maximum extent that is <br /> possible, soil samples will be collected from the floor and sidewalls of the excavation <br /> It is anticipated that 15 to 20 soil samples will be collected from the excavation sidewalls <br /> and floors Soil samples will be collected at 10-foot vertical intervals or as appropriate and <br /> ' at lithologic contacts Soil samples will also be collected at approximately 30 to 40 foot <br /> horizontal distances or as appropriate to identify and delineate the horizontal extent of <br /> hydrocarbon soil contamination <br /> 08220010 005 9 <br /> 1 <br />