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-� - <br /> 7 <br /> - r... it <br /> 1- - <br /> ry <br /> name <br /> �4 <br /> 36 <br /> GOLDEN GRAIN COMPANY <br /> December 21, 1_969 <br /> 202/799-5045.06 <br /> se the only low-permeability formation into <br /> constructed, and becau <br /> which a slurry wall could be keyed i^ tuv deep. <br /> 5.3 SOIL EXCAVATION <br /> soil excavation includes the physical removal of contamina- <br /> ted soil within the zone to be treated. This soil would require <br /> treatment or disposal off site, in accordance with appropriate <br /> federal, state, and local regulations. The advantages and disad- <br /> vantages of soil excavation at the site are as follows: <br /> soil Excavation Advantages: <br /> ,. Rapid removal of hydrocarbons from the vadose zone. <br /> 2. Removes the source of hydrocarbons leaching into the <br /> groundwater. <br /> soil Excavation Disadvantages: <br /> 1. Because the hydrocarbons are dispersed laterally an <br /> vertically, excavation would require moderately deep <br /> excavation (20 to 25 feet) and extensive shoring, <br /> 2. May cause structural or settling problems in .adjacent <br /> building. <br /> 3. Excavation of all soil containing hydrocarbons would <br /> require demolition of the building. <br /> 4. Exposure to excavated contaminated soils would increase <br /> public health risk. <br /> - GROUNDWATER! <br /> TEC11NOLnGY,INC. <br />