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' 10 June 1999 <br /> AGE-NC Project No 97-0290 <br />' Page 21 of 26 <br /> effective and 2)regulatory cleanup goals are difficult to attain,mostly due to persistent hydrocarbons <br />' detected during subsequent sampling events This technology is useful for hydraulic control to <br /> prevent spreading of the contaminant plume Minimizing water disposal costs will significantly <br />' increase feasibility of this method <br />' 8 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 /> the systems have difficulty achieving regulatory goals for ground water clean-up Systems typically <br /> operate for several years A treatment penod of 12 to 24 months is estimated for the site However, <br />' greater extraction flow rates would decrease remediation time <br />' 8 2 5 Cost <br />' Ground water extraction is usually a very costly method of ground water treatment Costs for <br /> installation of a "pump and treat" system typically ranges from $25,000 to $40,000, including the <br /> installation of one or more large-diameter extraction wells Once extracted, the contaminated water <br />' must be treated and/or will require disposal Treatment is highly dependant upon the concentrations <br /> of dissolved hydrocarbons in the ground water Based on the extraction/treatment of approximately <br /> 2,500,000 gallons of contaminated ground water, costs for the entire treatment protect would be in <br />' the range of$400,000 However, if extracted water can be disposed to the City of Lodi sanitary <br /> sewer, disposal costs would be greatly reduced <br /> I8 3 IN-SITU BIOREMEDIATION/BIOENHANCEMENT <br />' Hydrocarbons in ground water may be addressed by utilizing microbes to break down the <br /> hydrocarbons <br /> I <br /> 8 3 1 Basic Principles <br /> Bioremediation involves the introduction of hydrocarbon-degrading microbes or supplemental <br /> nutrients to enhance naturally-occurring bacteria, through wells into the ground water The microbes <br /> degrade hydrocarbons and spread laterally (and vertically) by migration and reproduction <br /> • Hydrocarbon-degrading microbes are able to metabolize hydrocarbons and assimilate the resulting <br /> f <br /> Advanced CeoEnvironmental,Inc <br />