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Brief descriptions of the treatment systems 1s as follows: <br /> o Air stripping - a typical air stripping operation is one in <br /> which groundwater is pumped to the top of a column filled <br /> with various packing materials such as tellerettes or Jaeger <br /> Tri-packs. Air is blown into the column counter-current to <br /> the water flow and drives volatile organic compounds from <br /> the water. <br /> o Oil/water separation - an oil/water separator utilizes <br /> closely spaced, sinusoidally-shaped plates to collect oil <br /> floating to the surface of the water. Other filter-type <br /> separators are also available. <br /> o Carbon adsorption - a typical carbon adsorption operation is <br /> one in which groundwater is pumped through multiple beds of <br /> granular activated carbon. <br /> o Biological treatment - a typical above ground (non-in-situ) <br /> biological treatment facility is one that utilizes a <br /> bioreactor which intimately mixes microbial species, nutri- <br /> ents, and oxygen with the target hydrocarbons to enhance <br /> biodegradation. <br /> The estimated costs associated with groundwater and treatment <br /> vary with site conditions as well as the treatment technology <br /> utilized. Costs can vary from $30, 000 for a basic system to over <br /> $2, 000, 000. These costs do not include operations in maintenance <br /> costs which range from $10, 000 per year to $100, 000 per year. <br /> 7. 3 Passive Remediation (No Action) <br /> This alternative is presented separately due to the fact that no <br /> site activities other than site characterization and routine <br /> monitoring would to be conducted. Site characterization in this <br /> case would involve conducting a risk assessment for the site. <br /> This risk assessment would evaluate the migratory pathways for <br /> the chemicals and evaluate the impacts of their presence on the <br /> environment. <br /> In addition, a long--term monitoring/tracking program will be <br /> required. This program would typically require the installation <br /> of additional wells to monitor the chemical migration. However, <br /> for this project, sufficient monitoring wells exist at the site <br /> so that additional well installation may not be required. <br /> -- 18 <br />