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' 17 February 2004 i AGE-NC Project No 96-0254 1 Page 8of10 during the pumping tests Utilizing data collected from monitoring wells, transmissivity value was calculated at 700 ftZ/day or 5,223 gallon/day/feet, a storativity value calculated at 0 047 and the hydraulic conductivity value of 0 123 cm/s The predicted radius of influence (ROI) was 95 feet utilizing field data Results of the May 2001 investigation were reported in Ground Water Aquifer Pumping Test Report-Second Quarter 2001 dated 18 June 2001, prepared by AGE 613 Duration Experience has shown that all systems involving ground water extraction require much more time than would be anticipated from aquifer tests and calculations of ground water discharge rates, and the method 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 Currently, the primary utility of pump-and-treat systems is in control migration of contaminated ground water _ 6 1 4 Cost ' Ground water extraction is usually a very costly method of ground water treatment Costs for installation of a "pump and treat" system typically ranges from $40,000 to $65,000, 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 MTBE the ground water, the cost per gallon could be as great as $0 1 based on the extraction/treatment of ' approximately 3,000,000 gallons of contaminated groundwater Costs for the entire treatment project would likely be between $100,000 and $300,000 r ' 6 2 IN-SITU OZONE-OXIDATION SPARGING ' The ozone sparge system is an in-situ air stripping and oxidation process utilizing fine bubbles of ozone-enrich air injected into saturated soil to extract adsorbed hydrocarbon constituents and ' decompose dissolved petroleum hydrocarbon constituents An ozone generator is utilized to produce gaseous ozone which is injected into the subsurface via microsparge points or fine well screen The "microbubbles" (approximately 50 micrometers) are forced out into the surrounding saturated soil and react with the target analytes,producing carbon dioxide and water The frequency and duration of ozone injection periods can be regulated at the ozone generator control box Initially, operation of the ozone injection system will be based on the manufacturer's recommendations Injection rates, ' frequency and duration may be adjusted to compensate for site conditions during a pilot test, based . on dissolved concentration reaction to the sparging, ground water flow direction changes and to reduce mounding of the ground water were necessary ' Advanced GeoEnvironmental,Inc