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f <br /> ARCO sites <br /> Page 2 <br /> solvent constituents to the site that are not considered to be from the ARCO site. This remediation <br /> will be further discussed by ARCO and SECOR. <br /> 16 E. Harding Way, Stockton #4932 <br /> The EHD will approve the proposed work plan. ARCO,vill work with ConocoPhillips on <br /> installation of a remediation system for the MTBE that has migrated onto their site at 1502 N. El <br /> Dorado. <br /> 1617 W. Fremont Street.Stockton. 45450 <br /> The plan for destruction of the monitoring wells has been approved by EHD and the work is to be <br /> scheduled. <br /> 130 S.Wilson Way, Stockton, #5469 <br /> The Site Conceptual Model has been submitted and concludes that the contaminant plumes from <br /> 101 S.Wilson Way and 102 S.Wilson Way are commingled with the contaminant plume from this <br /> site_ The EHD is in agreement with this conclusion and encourages ARCO to contact the other <br /> responsible parties about entering into a commingled plume agreement and applying to the State <br /> Water Resources Control Board Cleanup Fund for reimbursement of corrective action costs. There <br /> are three monitoring wells proposed for installation off-site. The property owner verbally agreed but <br /> has not signed the access agreement. ARCO will follow-uIp on obtaining the access agreement. <br /> ARCO will consider upgrading the currently operating ozone system to a system that injects a greater <br /> amount of ozone per hour. The EHD itzquired as to whether the reported dissolved gasoline range <br /> organics (GRO) included MTBE. ARCO will clarify with the laboratory if MTBE is included in the <br /> GRO result because that would indicate that all the GRO reported is MTBE. <br /> 85 Louise Avenue,Lathrop, 6080 <br /> A work plan for destruction of the monitoring wells is to be submitted to EHD. <br /> 25775 S. Patterson Pass,Tracy, #6100 <br /> SECOR prepared a Light Non-aqueous Phase Liquid (free product)Assessment Report for the site <br /> and did not feel they could estimate the mass of free product at the site. The EHD agreed that it <br /> would be difficult given the complexity of the site. SECOR will measure vapor coming out of <br /> individual wells and propose destruction of any wells that do not have any vapor concentrations and <br /> are not necessary for remediation. Vapor well VW-B will,be destroyed and two separate wells will be <br /> installed to avoid providing a conduit between sand units.I The EHD will discuss this site with the <br /> Central Valley Regional Water Quality Control Board(CVaZWQCB). If the CVRWQCB concurs <br /> that the site is defined, the EHD will require submittal of a Final Corrective Action Plan and conduct <br /> public participation. <br /> If you have any questions or comments please contact the appropriate LOP staff overseeing the site <br /> or call me at(209) 468-3449. <br /> Donna Heran,RENS,Director <br /> Environmental Health Department <br /> Margaret Lagorio,REHS <br /> Program Coordinator Unit IV <br /> C. CVRWQCB—James L.L. Barton,RG <br /> SECOR—Rusty Benkosky, Brian Westhoff <br />