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A� <br /> GOLDEN GRAIN COMPANY 47 <br /> December 21, 1989 <br /> 202/799-5045.06 <br /> 6.0 RECOMMENDATIONS <br /> To prepare for this PAR, GTT has collected extensive infor- <br /> mation on site conditions and identified potential remediation <br /> alternatives. After reviewing the data and evaluating the <br /> technical and economic feasibility of each of the remediation <br /> alternatives, GTI recommends a soil-vapor extraction system <br /> coupled with a groundwater extraction and treatment system as the <br /> most effective and suitable remedial action for this site. <br /> This combined system addresses both areas containing petro- <br /> leum hydrocarbons: the subsurface soil and groundwater. The <br /> other potential options (no action, excavation, or physical <br /> containment) were not selected because of the high concentrations , <br /> of petroleum hydrocarbons, their lateral and vertical distri- <br /> bution in the soil, the limited space available, and the presence <br /> of the building (see section 5.0) . <br /> The soil-vapor extraction system will: (1) remove the <br /> hydrocarbons that are sorbed to the soils in the vadose zone, and <br /> (2) volatilize and remove the small amounts of free product still <br /> present on the groundwater surface. This system will include <br /> installation of a network of vapor recovery wells and above- <br /> ground piping, which will be connected to a vapor collection and <br /> (if required) treatment system. soil conditions (permeability, <br /> unit thicknesses, etc.) and analytical data collected to date <br /> indicate that this system will effectively remove hydrocarbons <br /> from the soil. <br /> The groundwater extraction and treatment system should <br /> result in containment and recovery of the petroleum hydrocarbon <br /> --- -- plume. -A--recover -well-.will....be-placed--just south of the buil- <br /> y . <br /> GROUNDWATER <br /> TECHNOLOGY,INC. <br />