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I 4ti <br /> ' la <br /> J6' ' 2$ February 1997 <br /> AGE-NC Project No 95-0144 " <br /> Page 15 of 20 M <br /> r , <br /> 6 16 COST <br /> r <br /> Installation of an to-situ air sparging system will 'require the installation of several sparging and <br /> extraction wells,piping system and equipment Setup costs would likely range from $20,000 00 to <br /> $40,000 00 Sparging equipment maintenance and monitoring would range from $5,000 00 to <br /> ' $10,000 00 annually <br /> ' If air sparging is chosen forround water remediation extraction will be u <br /> g � vapor p used for vadose zone , <br /> soil remediation Therefore,extraction equipmeiit and monitoring costs would be included under soil , <br /> vapor extraction estimates <br /> t <br /> 62 , GROUND WATER EXTRACTION <br /> IW , <br /> 621 1 BASIC PRINCIPLES <br /> There are several different methods for treatment of extracted ground water, which are collectively <br /> called `I`pump a'nd treat ' As the name indicates,i all methods involve extraction and trarisfer of <br /> contaminated ground water from the aquifer to an above-ground treatment or disposal/recycling <br /> facility The extraction is performed using an automatic pump system to maintain capture <br /> characteristics in the aquifer and to assure that process volume requirements axe maintained After <br /> `I treatment, the water is usually discharged into a storm dram or sanitary sewer A waste discharl;c <br /> permit is usually required for discharge <br /> t , <br /> r , <br /> I <br /> f 6 2 2 TREATMENT METHODS y <br /> 4 <br /> I^ The documented presence of hydrocarbons will,require treatment for the recovered water Two of <br /> the most common methods of water treatment are air stripping and carbon adsorption Air stripping y <br /> ' involves removal of volatile organic compounds from ground water by promoting the transfer of <br /> contaminants from the dissolved phase to the vapor phase Carbon adsorption utilizes granular <br /> activated carbon to simply "filter,'organic compounds out of ground water <br /> A `third, but less common method of above-ground treatment-of water is-bioremediation -, <br /> Contaminated ground water is "treated" by adding hydrocarbon-degrading microbes or by r <br /> augmenting natural hydrocarbon degradation activities with the introduction of nutrients <br /> I <br /> , I <br />