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r <br /> } <br /> r <br /> j <br /> 15600 Harlan Rd., Lathrop <br /> Page 2 <br /> 3. Plots of key chemical coil ncentrations vs. time (e.g., plots should be shown <br /> for monitoring wells that'demonstrate significant trends in contaminant <br /> concentrations); <br /> 1 <br /> 4. Summary tables,of chemical concentrations in different media; <br /> 5. Dissolved and adsorbed contamination mass estimates supported by <br /> calculations; <br /> 6. Boring and well logs (including construction/screening). <br /> Since MTBE contamination has migrated off site the feasibility of groundwater <br /> - ..=e ract on-to:sto.p_fuarther-mig_raiion_and asLLa 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 ether remedial alternatives for this site should be submitted by <br /> July 16; 2003. <br /> Laboratory analytical results are not being electronically submitted to <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 /> v'Avalon Environmental - Trevor Santochi <br /> i <br /> i <br />