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:15F U 11+ f u! i Ljt+ 5+ •qCy tiw(c)..tfi} 43ti a?IACV .j11 i' ,j+aE Zx]«u—tc.14 411aw+, s11424,r+J nt+5.)7 t �i,�t' 11««1`;n 1i1�+4.cf5 +Aryr Iti r t E_—t -. —, .µ n3a r= <br /> i <br /> I <br /> 1 j <br /> 15 February 2000 <br /> AGE-NC Protect No 98-0448 <br />' Page 26 of 33 <br /> Ishorter-chain hydrocarbons <br /> 916 Cost <br /> Installation of an IAS system would require the installation of one to two additional 1AS wells, an <br /> IIAS piping system and IAS equipment Setup costs would likely range from $15,000 to $25,000 <br /> Sparging equipment maintenance and monitoring would range from $5,000 to $10,000 annually <br /> Based upon a treatment period of 24 months, the total costs would be in the range of$20,000 to <br /> $35,000 <br /> If air sparging is chosen for ground water remediation, vapor extraction will be used for vadose zone <br /> I soil remediation Extraction equipment and monitoring costs are included under the soil vapor <br /> extraction estimates <br /> 9 2 GROUND WATER EXTRACTION <br /> There are several different methods for treatment of extracted ground water, which are collectively <br /> called "pump and treat" As the name indicates, all methods involve extraction and transfer 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 are maintained After <br /> treatment, the water is usually discharged Into a storm drain or sanitary sewer A waste discharge <br /> permit is usually required for discharge <br /> 9 2 1 Treatment Methods <br /> r , <br /> The documented concentrations of dissolved hydrocarbons on the site will trigger a requirement for <br /> treatment of the extracted water Two of the most common methods'of-water treatment are air <br /> I stripping and carbon adsorption Air stripping Involves removal of volatile organic compounds from <br /> ground water by promoting the transfer of contaminants from the dissolved phase to the vapor phase <br /> Carbon adsorption utilizes granular activated carbon to simply "filter" organic compounds out of <br />' ground water <br /> A third, but less common method of above-ground treatment of water is bioremediation <br /> I Contaminated ground water is "treated" by adding hydrocarbon-degrading microbes or by <br /> augmenting natural hydrocarbon degradation activities with the introduction of nutrients <br /> Advanced GeoEmironmental,Inc <br />