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Ms Mary Meays Page 2 <br /> March 3, 1997 <br /> The ERM field crew installed the ORC socks on October 14 after the last of the <br /> ground water samples had been collected The Manganese Peroxide (M902) <br /> socks were placed in wells within the screened interval at a number <br /> approximately equal to one sock for every foot of screen As specified in our <br /> August 12, 1996, letter and in your September 12, 1996, response, ORC socks <br /> were installed at the following locations <br /> Former Tank Site#1 <br /> MW-1 <br /> • MW-4 <br /> • MW-5 <br /> • The vapor extraction well installed in the excavation pit <br />' Former Tank Site#2 <br />' • MW-1A <br /> • MW-2A <br /> MW-3A <br /> • MW-4A <br /> Under the ORC process, the M902 in the filter socks release oxygen into ground <br /> water at a slow controlled rate (typically 8 to 10 mg/1) This oxygen is then used <br /> by microorganisms to degrade hydrocarbons <br /> GROUND WATER FLOW PATTERNS <br />' Ground water elevation data for the October 1996 monitoring event is presented <br /> in Attachment A These data are posted and contoured on Figure 2 As observed <br /> on this figure, the ground water flow direction is generally to the south, with a <br />' slight mounding in the immediate vicinity of Former Tank#2 Ground water <br /> flow direction and water level fluctuations observed during this event are <br /> consistent with observations made during the previous sampling events <br />