ARCHIVED REPORTS XR0000990 - Laserfiche WebLink

Home Browse Search

'29 ApriF2005 :le - AGE-NC Project Na. 98-0440 , Page 14 of.18 7:1.2. Feasibility. Testing Aquifer testing has riot been performed at the'site; Site-specific testing would have to be performed prior to initiation of a pump and-treat"method.At the present time, ground water-is-approximately 13-to 14 feet bsg, within the sand layer located at the top of the water table or 10-feet bsg. There areseveral disadvantages to'pump and treat" methods, which include: 1)'extended cleanup . periods,resulting in increased total costs,although the maintenance for this method is relatively'cost effective and 2)regulatory cleanup goals are difficult to attain,mostly due to persistent hydrocarbons t detected dining subsequent sampling-events. 'This technology is.useful for. hydraulic control to prevent_spreading of the contaminant plume: Minimizing water disposal costs will significantly increase feasibility,of this method. ' 7.1.3. Duration ` ` Experience has shown that all systems involving ground water extraction require much more time ' liethan would be anticipated from aquifer tests and calculations of ground water discharge rates, and method ethod seldom achieves regulatory goals for ground water clean-up. Systems typically operate for several years.During this time,pumps and other equipment may need replacement several times. 7.1.4. Cost •Ground water extraction is usually a very costly method of ground water treatment. Costs for installation.of a."pump,and treat" systet h typically ranges from $_30,000 to $50,000, including the, installation of large-diameter extraction wells. Once-extracted, the contaminated:water must be treated 'or disposed. Treatment` is'highly dependant upon 'the concentrations of dissolved. hydrocarbons in the.ground water; the cost,per gallon.could be as.great,as $2 based.'on the = extraction/treatment of approximately,100,000 gallons of contaminated ground water. Costs for the . entire project would likely be'between $100, 000 and $300,000. 7.2. VIN-SITU BIOREMEDIATION/BIOENHANCEMENT ., , In-situ bioremediation involves the introduction 'of h drocarbon-degrading microbes and/or supplemental nutrients to enhance naturally-occurring or injected bacteria,`through wells into the ground water.The microbes degrade hydrocarbons and spread laterally(and vertically)by migration and reproduction. �. Advanced GeoEnvironmental,Inc.