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1 27 December 1996 AGE-NC Protect No 95-0143 ' Page 14 of 19 ' Madison site, indicating minimal concem for iron precipitation ' 6I5 DURATION Air sparging in highly permeable aquifers generally results in rapid reduction of hydrocarbon ' concentrations in the saturated zone Remediation times are generally comparable with soil vapor extraction times At the subject site,we estimate a remediation period of 12 to 24 months for shorter- chain hydrocarbons 6 1 6 COST Installation - of an in-situ air sparging system will require the installation of numerous sparging and extraction wells, piping system and equipment Setup costs would likely range from $40,000 00 to $60,000 00 Sparging equipment maintenance and monitoring would range from $5,000 00 to $10,000 00 annually If air sparging is chosen for ground water remediation, vapor extraction will be used for vadose zone soil remediation Therefore, extraction equipment and monitoring costs would be included under soil vapor extraction estimates 6 2 GROUND WATER EXTRACTION 6 2 1 BASIC PRINCIPLES There are several different methods for treatment of extracted ground water, which are collectively called "pump and treat" As the name indicates, all methods involve extraction and transfer of contaminated ground water from the aquifer to an above-ground treatment or disposal/recycling facility The extraction is performed using an automatic pump system to maintain capture characteristics in the aquifer and to assure that process volume requirements are maintained After treatment, the water is usually discharged into a storm drain or sanitary sewer A waste discharge permit is usually required for discharge 6 2 2 TREATMENT METHODS The� documented presence of hydrocarbons require treatment for the recovered water Two of+ rocarbons will the most common methods of water treatment are air stepping and carbon adsorption Air stripping