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- <br /> GOLDEN GRAIN COMPANY 39 <br /> December 21, 1989 <br /> 202/799-5045.06 <br /> 5. Requires use of another technology to remediate ground- <br /> water. <br /> f. Extensive site restoration required. <br /> 7. Moderate to high cost. <br /> Soil excavation is not viable at this site because the <br /> hydrocarbons in soil underlying the building and streets will not <br /> be addressed by this method. Since the area under the building <br /> will require other treatment methods (such as vapor extraction <br /> and groundwater extraction) , it will be more effective to design <br /> one integrated system to treat all the soil and groundwater at <br /> the site. <br /> The decision to treat the soils or take them directly to a <br /> r <br /> landfill would be contingent on the volume of soil and the <br /> hydrocarbon concentration levels present in the excavated soil. <br /> 5.3.1. Disposal of Excavated Soil <br /> If soil is excavated, it may require off-site disposal at a <br /> Class I (if hydrocarbon concentrations are greater than 1,000 <br /> ppm) , Class II (concentrations between 100 and 1,000 ppm) , or <br /> Class III (concentrations less than 100 ppm) san'tary landfill. <br /> Soil Disposal Advantages: <br /> 1. Disposal removes soil from the site quickly. <br /> `�- GROUNDWATER <br /> TECHNOLOGY,INC. <br />