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�.r S E-C .0 R �. <br /> Mr. Mike Infurna <br /> December 30, 2003 <br /> Page 2 <br /> Assessment dated April 7, 2003. ConocoPhillips will be submitting an interim remedial action plan <br /> (IRAP)and work plan for onsite ozone system installation by January 30, 2004 (see below), and will <br /> include the completion of vertical assessment in that work plan. <br /> Summary of Proposed Work <br /> As indicated above, ConocoPhillips will be submitting an interim remedial action plan (]RAP)and <br /> work plan for onsite ozone sparge system installation by January 30, 2004. ConocoPhillips would like <br /> to install and begin operation of the onsite ozone sparge system during the first half of 2004 which will <br /> prevent the continued migration of the dissolved plume offsite. The installation of the ozone sparge <br /> system is intended as an interim remedial action and will be performed in conjunction with work <br /> requested by SJCEHD. The following is a summary of work requested by SJCEHD and proposed by <br /> ConocoPhillips: <br /> ConocoPhillips proposes to submit an ]RAP and work plan for onsite ozone system <br /> installation by January 30,2004 with the goal of installing and beginning operation by June 1, <br /> 2004. The work plan will include the completion of vertical assessment. <br /> ConocoPhillips has proposed to complete lateral assessment of the plume as outlined in <br /> Addendum to Work Plan for Off-Site Assessment dated April 7, 2003. <br /> Following the completion of both the vertical and lateral assessment, SECOR will prepare <br /> and submit a Site Conceptual Model (SCM)as requested in SJCEHD letter dated May 8, <br /> 2003. <br /> Following submission of the SCM, a Corrective Action Plan (CAP)and Remedial Action Plan <br /> (RAP)will be prepared as requested by SJCEHD. <br /> If there are any questions, please call us at(916)861-0400. <br /> Sincerely, Qt�F <br /> SECOR Inter ational, Incorporated P � E.BF�y� �Lv <br /> N0.C 068399 <br /> Clinton Harms * E)qx 12/31/06 Y4 <br /> Project Scientist N] �Q <br /> 9T GIV\"\- <br /> OP C <br /> gusty <br /> nkosky, P. . <br /> Senior Engineer <br /> Attachments: Figure 1 -Site Plan <br /> Attachment A—4`h Quarter 2003 Groundwater Laboratory Analytical Report <br /> cc: Mr. Ed Ralston, ConocoPhillips <br /> I:\ConocoPhillips\Tosco Marketing\1205\Work Plans\response letter.doc <br />