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i <br /> 15600 Harlan Rd., Lathrop <br /> Page 2 <br /> 3. Plots of key chemical concentrations vs. time (e.g., plots should be shown <br /> for monitoring wells that demonstrate significant trends in contaminant <br /> concentrations); <br /> i <br /> 4. Summary tables of chemical concentrations in different media; <br /> 5. Dissolved and adsorbed contamination mass estimates supported by <br /> calculations; ' <br /> E <br /> 6. Boring and well logs (including construction/screening). <br /> i <br /> Since MTBE contamination has migrated off site the feasibility of groundwater r <br /> extraction to stop further migration and as a remedial alternative should be <br /> investigated. Using information in the SCM propose and justify additional <br /> investigative work to delineate the contamination at this site and evaluate <br /> feasible remedial alternatives. A work plan to further investigate the lateral and <br /> vertical extent of MTBE contamination and evaluate the feasibility of groundwater <br /> extraction and/or other remedial alternatives for this site should be submitted by <br /> July 16, 2003. <br /> Laboratory analytical results are not being electronically submitted to k <br /> GeoTracker—the State Water Resources Control Board database program. <br /> This is required by Water Code Section 13196 and commonly referred to as AB <br /> 2886. Electronic transmission of laboratory analytical results to GeoTracker <br /> must be initiated immediately. <br /> If you have any questions contact me at (209)468-3449. <br /> Margaret Lagorio, Supervising REHS <br /> Unit IV <br /> Donna Haran, REHS Director <br /> Environmental Health Department <br /> c: CVRWQCB — Jim Barton <br /> Avalon Environmental-Trevor Santochi <br /> i <br /> 3 <br /> 1 <br /> _ I <br /> f <br />