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SECOR inn ion - <br /> INTERNATIONAL 3011 Kilgore Po I T • 100 - � <br /> �- INCORPORATED Randio Cordova t 95870 <br /> r31 G,k> l -ua7 l i. <br /> April 5, 2007 T <br /> (, ylZglul <br /> Mr. Mike Infurna <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue , Third Floor <br /> Stockton , CA 95202 j1 <br /> RE: Addendum to " Work Plan for Additional Assessment' dated February 12, 2007 <br /> ARCO Service Station 2130 <br /> 7906 North EI Dorado Street { <br /> Stockton, California <br /> SECOR Project No.: 77BPA2130. 01 .0136 l <br /> Dear Mr. Infurna: <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of Atlantic <br /> Richfield Company, a BP Affiliated Company, presents an addendum to SECOR's Work Plan for <br /> Additional Site Assessment dated February 12, 2007 for the site referenced above. The scope <br /> of work of the original workplan called for the Installation of seven groundwater monitoring wells <br /> and the performance of oxygen injection bench scale testing. Based upon a conversation with <br /> Mr. Mike Infurna of San Joaquin County Environmental Health Department on March 8, 2007, <br /> this addendum has been prepared to add the installation of additional monitoring wells to help <br /> complete site assessment. Two additional shallow zone monitoring wells (MW-21 and MW-22) <br /> and one intermediate zone groundwater monitoring well (MW-23) have been added to the <br /> original scope of work and will be installed at the locations on Figure 1 . Field and laboratory <br /> procedures outlined in the original workplan will remain the same. <br /> i <br /> Should you have any questions regarding this project, please feel free to contact the <br /> undersigned at (916) 861 -0400. <br /> Sincerely, Eb <br /> SECOR international Incorporated t E' MrYfi <br /> Prepared by: Reviewed by: c+ <br /> # EXP, <br /> &sky <br /> 120112008 <br /> Kristin Shelton Ru , . E. sf CIVIL <br /> Associate Engineer Principal Engine r 9 pxCALIFO���P <br /> Figure 1 Site Plan with Proposed Monitoring Wells <br /> J <br /> cc: Mr. James Barton , Regional Water Quality Control Board, Central Valley Region <br /> Mr. Don Pratt, Atlantic Richfield Company (Uploaded to Enfos) <br /> Uploaded to Geotracker <br /> I <br />