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i Ranch Market 23569 South Santa Fe Road - 2 - 13 May 2002 I systems are implemented, the responsible parties will be required to optimize system performance by shutting off or adjusting flow rates from certain SVE wells based on the measured contaminant concentrations in both the contaminant concentrations at the individual extraction wells and the influent to the treatment system Modifications may include the expansion of the remedial system such as installing additional vapor extraction wells and monitoring points After the SVE and ozone sparging systems have been operated for a suitable time and mass removal rates are declining, a preliminary evaluation of system shut off will need to be performed If contaminant concentrations for all extraction wells and the combined vapor influent have reached asymptotes, the system should be shut off to determine if contaminant rebound will occur If after these actions, the cleanup goals have not been met, an evaluation of whether or not it is economically and technically feasible to continue remediation using the existing SVE and ozone sparging systems, or to evaluate an alternative remedy will need to be conducted 4 Secor recommends monitoring and sampling air sparge pilot test well AS-1 on a quarterly basis AS-1 is screened from 40 to 45 feet, and water samples from this depth would be helpful to monitor the dynamics of the plume during remediation Thus recommendation is approved I 5 Board staff accepts the Project Schedule included in the Workplan with a system startup planned for late July 2002 Please notify this office and the County in writing if there are substantial set backs in this schedule, and update the schedule in future quarterly monitoring events until the remedial systems are installed and operational 6 UST regulations require public notice prior to implementing a corrective action plan Therefore, please send a one-page summary of the proposed activities contained in the FRP and the approved Workplan to the four residences near the Ranch Market site, and to Mr Mike Infurna at the San Joaquin County Environmental Health Department(County) for posting at the County office All reports and correspondence are to be submitted to this office and to Mr Infurna with the County Please call Mr Infurna at (209) 468-3454 and me at least five business days prior to any site work or sampling to schedule a field inspection appointment If you have any questions or comments, please call me at(916) 255-3115 'C�- ? va^-- Marty Hartzell, R G Associate Engineering Geologist cc Mr. Mark Owens, UST Cleanup Fund, SWRCB, Sacramento Mr Mike Infurna, San Joaquin County Environmental Health Division, Stockton Mr Jaff Auchterlome, Secor International Incorporated, Sacramento •