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r <br /> NOW <br /> linked with AT 123D (groundwater model) will be used in a Tier III level assessment. <br /> Mark List of RWQCB and Margaret Lagorio agreed on the modeling approach. <br /> 2. RBCA IMPLEMENTATION AND WORKPLAN OVERVIEW: <br /> A. Denise Clendening presented EPA's position on using RBCA at underground storage <br /> tank sites. The EPA's OSWER Directive 9610.17 dated March 1, 1996 encouraging <br /> the use of RBCA was handed out at the meeting. <br /> B. The proposed RBCA approach for the site that was outlined in the draft workplan was <br /> presented at the meeting. Caltrans requested comments on the content of the draft <br /> workplan from the agencies before the final workplan is submitted. <br /> C. Information on proposed Senate Bill 2170 which would require risk based approaches <br /> at sites in California where remedial action is required by the Department of Toxic <br /> Substances and RWQCB was given to Mark List. <br /> 3. NEXT STEPS <br /> A. Caltrans will wait two weeks following the submittal of these meeting minutes to <br /> receive written comments from SJHCA and RWQCB to the draft workplan. Caltrans <br /> will then incorporate any written comments. Following finalization of the workplan, <br /> the risk assessment and groundwater impact analysis will commence. <br /> 4. CLOSING REMARKS AND GENERAL AGENCY COMMENTS <br /> A. Margaret Lagorio stated that the monitoring wells are not screened correctly in that <br /> the water table has now currently risen above the top of the screened interval. <br /> Caltrans indicated that earlier groundwater data was obtained when the top of the <br /> screened interval was at or near the interface and the wells were installed following <br /> agency direction on well installation. <br /> B. SJHCA and RWQCB position on natural attenuation is that they would want a study <br /> to be conducted to support if natural attenuation is occurring (i.e. microbial <br /> enumeration) if proposed as a remedial alternative. Margaret Lagorio thought that the <br /> soil data indicated that biodegradation was not occurring. Denise Clendening <br /> indicated that the data will be reviewed and analyzed following EPA protocol as part <br /> of the RBCA process to evaluate if any data trends are occurring. <br /> C. Mark List of the RWQCB saw the value of the RBCA analysis as a tool. <br /> 5. THE MEETING WAS ADJOURNED AT 4 PM. <br />