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n\ <br /> . including soil vapor extraction However, the volume of soil that would be remediated by this method <br /> would undoubtedly be a small percentage of the originally contaminated soil--probably less than°5% of <br /> the volume that has'already been remediated through excavation In addition, the base of unit 4 is at a <br /> depth of 17 feet or less, meaning that any mobile hydrocarbons are more than 10 feet above the highest <br /> potential groundwater level and more than 20 feet above its present level Therefore, installation of an <br /> expensive vapor extraction system to remove less than 5% of the contamination would probably not be <br /> cost effiectave <br /> 9 <br />