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Mr. Nuel HendersonS E C O R <br /> December 18, 2006 N001 <br /> Page 2 <br /> pending execution of an access agreement. SECOR will renew talks with the property <br /> owner regarding an access agreement to install these wells. <br /> SECOR will prepare and submit a SCM for ARCO 5469. The SCM will evaluate the <br /> commingling of the dissolved contaminant plumes from the three sites. An evaluation of the <br /> ozone system at the site and a sensitive receptor survey will also be included in the SCM. <br /> We propose a due date for the SCM of March 15, 2007. <br /> ARCO 6100—25775 South Patterson Pass Road, Tracy <br /> SJCEHD requested an evaluation of the free product at the site and a recommendation for <br /> future remedial action. It was agreed that there is little shallow groundwater at the site and <br /> that the SVE system onsite continues to remove large amounts of hydrocarbon mass from <br /> the subsurface. Following an evaluation of the recent SCM submitted by Stratus it was <br /> determined that the offsite free product may be removed by SVE. SECOR will prepare and <br /> submit a work plan for evaluating the current SVE system radius of influence. This <br /> information will be used to design an offsite remedial system. Completion of work on the <br /> offsite property is dependent upon execution of a modified access agreement with the <br /> property owner. It was agreed that this work plan will be submitted in lieu of the requested <br /> fate and transport evaluation of the LNAPL plume. <br /> Again, Atlantic Richfield Company and SECOR appreciate the cooperative approach <br /> facilitated by the SJCEHD and share the SJCEHD's objectives to identify and mitigate the <br /> remaining hydrocarbon source of groundwater impacts at these sites. If you have any <br /> questions or concerns, please call SECOR at (916) 861-0400 regarding this issue. <br /> Sincerely, <br /> SECOR International Incorporated <br /> Kristi Shelton <br /> Associate Engineer <br /> V <br /> Rusty Benkosky, E. <br /> Principal Engine r <br /> cc: Mr. Don Pratt, Atlantic Richfield Company (Upload to Enfos) <br /> Ms. Lori Duncan, SJCHED <br /> Ms. Margaret Lagorio, SJCEHD <br /> 12-7-06 SJCEHD Meeting Notes.doc <br />