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Interim Corrective Action Plan <br /> .' Frontier Transportation, Inc. <br /> December 20, 2005 <br /> Page 5 <br /> Installation of ozone injection/sparge wells and an aquifer test would need to be <br /> performed in order to design the proper sparge well placement The neutron logging will <br /> provide moisture measurement after equilibration of the effects of drilling Accurate <br /> identification of soil lzthology and moisture content is necessary for effective ozone injection <br /> and appropriate migration to the gasoline layer Neutron logging should be used to refine <br /> lithology and moisture analysis performed on soil during drilling Neutron logging can be <br /> performed non-destructively down well weeks after well development to address moisture <br /> displacement caused by the drilling process itself Neutron Logging supplemented by soil gas <br /> analysis will determine the radius of influence of the injected ozone and increased bioactivity <br /> resulting from the injection process as well as direct oxidation of the MTBE <br /> Tasks necessary for installation of an Ozone Injection; <br /> Task 1 Install and develop two (2) additional groundwater monitoring/aquifer test <br /> wells at the hydraulic down-gradient site area described (by MW-9) Well spacing <br /> 20' on center Well depth to 40' bgs Install two (2) additional groundwater <br /> monitoring/aquifer test wells at the source area described by MW-3R Well <br /> spacing 20' on center Perform aquifer test to order to determine sparge well <br /> placement Perform neutron thermalization logging (NTL) to define equilibrated <br /> soil moisture, saturated zones <br /> Estimated Cost <br /> 1 Well Installation, development, soil analysis, workplan and reporting for <br /> four (4) wells to 40' bgs - $ 25,000 00 <br /> 2 Aquifer testing and Neutron Thermalization Logging - $ 30,00000 <br /> I Task 2 Installation of sufficient sparge wells to cover impacted area <br /> Estimated Cost - $ 35,000 00 <br /> Task 3 Installation of compound to house/protect ozone equipment <br /> Estimated Cost - $ 28,000 00 <br /> Task 4 Install ozone equipment and piping to sparge wells <br /> Estimated Cost - $ 105,000 00 <br />' Task 5 Operate system <br /> Estimated Cost - $350/week <br />' Task 6 Identify electron acceptor depletion in groundwater and capability for <br /> completed aerobic and anaerobic biodegradation of the gasoline source and down- <br /> gradient plume, identify increased oxygen levels and breakdown products resulting <br />' from ozone injection <br /> Quarterly testing - $ 4 800 00 per test <br />' The initial cost to run a pilot study and set up an ozone injection system would range <br /> I <br /> I <br />