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' 15 June 1999 <br /> AGE-NC Project No 98-0450 <br /> Page 21 of 27 <br /> The disadvantages of"pump and treat" methods include 1) extended clean-up periods, resulting in <br /> ' increased total costs, although the maintenance for this method is relatively effective, and 2) <br /> regulatory cleanup goals are rarely attainable Ground water extraction is generally not a desirable <br /> method for remediation However, ground water extraction technology is useful for reduction of <br /> hydrocarbon concentrations at the source area and as a hydraulic control to contain the migration of <br /> the contaminant plume <br /> 5 2 4 Duration <br /> Experience has shown that all systems involving ground water extraction require much more time <br /> than would be anticipated from aquifer tests and calculations of ground water discharge rates, and <br /> ' seldom achieve regulatory goals for ground water clean-up A treatment period of 24 month to 3 <br /> years is estimated for the site <br /> ' 525 Estimated s imated Cost <br /> Installation of an extraction well and several ground water monitoring wells would be required to <br /> conduct aquifer pumping tests Well installation,pumping tests,and ground water modeling analysis <br /> ' is estimated to cost between $35,000 and $75,000 Costs for installation of aground water extraction <br /> system typically ranges frond$25,000 to $40,000 Once extracted, the contaminated water must be <br /> treated Treatment method (air stripping and carbon adsorption) costs are highly dependant on <br /> 1 concentrations of dissolved hydrocarbons and process volume The cost for granular activated carbon <br /> is estimated to range from $30,000 to $40,000 annually Operation, maintenance and monitoring of <br /> a ground water extraction system is estimated to cost $15,000 to $70,000 annually The total cost <br /> ' of giound water extraction for 2 to 5 years is estimated to cost from $150,000 to $475,000 <br /> I5 3 IN-SITU BIOREMEDIATION/BIOENHANCEMENT <br />' In-situ bioremediation is an in-ground remediation technology that uses microorganisms to degiade <br /> organic constituents in ground water <br />' 5 3 1 Principles <br />' Treatment of ground water and soil contamination in the saturated zone by in-situ bioremediation <br /> involves the addition of hydrocarbon-degrading microbes, nutrients and/or oxygen to an aquifer in <br /> order to enhance the degradation of petroleum hydrocarbons by microbes The nutrients and oxygen <br /> Advanced GeoEnriron menial,Ine <br /> 1 <br />