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Stantec <br /> Addendum Remedial Action Plan — Former Tosco Bulk Terminal No. 10013 <br /> July 21, 2010 <br /> Explain the discrepancies between the estimated amounts of oxygen injected reported in the <br /> Third Quarter 2009 Status Summary Report, First Quarter 2010 Status Summary Report, and the <br /> RAP. <br /> Between December 17 and 21, 2007, mobile oxygen injection activities were initiated at the site as part <br /> of pilot study activities. Approximately 2,964 pounds of oxygen was injected at the site during the pilot <br /> study activities between December 17, 2007 and June 20, 2008. <br /> On July 27 and 28, 2009, utilizing wells IP-10, IP-11, the new wells IP-14 through IP-17, and the deeper <br /> well MW-22 as remedial injection wells, Stantec initiated the continuation of the oxygen injection pilot <br /> study. Approximately 2,937 pounds of oxygen was injected at the site during the continuation of pilot <br /> study activities between July 27, 2009 and March 22, 2010. <br /> The approximate total amount of oxygen injected presented in the Third Quarter 2009 Status Summary <br /> Report of 3,740 pounds was based upon the total amount injected during the initial pilot testing <br /> activities (2,964 pounds between December 17, 2007 and June 20, 2008) plus the 774 pounds injected <br /> during the third quarter 2009. <br /> The total amount of oxygen injected presented in the First Quarter 2010 Status Summary Report of <br /> 2,937 pounds was only based on the timeframe in which oxygen injections were reinitiated on July 27, <br /> 2009 through to the close of the first quarter 2010. <br /> The estimated 5,900 pounds of oxygen injected reported in the Remedial Action Plan submitted on <br /> April 30, 2010 was the grand total of oxygen injected during both separate time periods of oxygen <br /> injection activities (December 17, 2007 through June 20, 2008 = 2,964 pounds plus July 27, 2009 <br /> through March 22, 2010 = 2,937 pounds; summed together equals approximately 5,900 pounds). <br /> If you have any questions or comments regarding this addendum letter, please feel free to contact <br /> Sean Coyle (Stantec Project Manager) at (916) 861-0400 extension 222 <br /> Sincerely, <br /> Stantec Consulting Corporation <br /> SONAL G -1'''a <br /> �g ..........�F0 <br /> pS lED) ••l0C <br /> No.4422 " <br /> Sean Coyle Ed Simonis, P.G w �: <br /> Associate Scientist Senior Geologist q-50'Z-Z9.1Z = <br /> "'140014 IiII101,0 <br /> 3 <br />