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2575 Country Club <br /> September 1997 <br /> Page 2 <br /> PHS/EHD must be contacted prior to and following the completion of a field activity to discuss which <br /> soil and/or groundwater samples will be submitted for laboratory analysis. Additionally, please note that <br /> a copy of the most recent direction from the Central Valley Regional Water Quality Control Board dated <br /> August 30, 1997 includes soil sample analysis for oxygenates. A copy has been included for your <br /> information. <br /> The work plan stated that a step-drawdown test and a constant-rate discharge pump test were proposed <br /> for remedial design and to characterize the site's aquifer properties. Please provide a description of the <br /> methodology which will be used. PHS/EHD concurs that information regarding site specific hydrologic <br /> characterization is necessary. Additionally, please be aware that groundwater extraction is valuable to . <br /> affect contaminant plume migration, but is not generally considered a cost effective remedial alternative. <br /> PHS/EHD has directed Shell to complete all necessary feasibility studies by October 31, 1997. There is <br /> data available for vapor extraction which could be used, since vapor extraction was used for emergency <br /> mitigation. Please submit a description of the scope of work for the feasibility study which will be used <br /> to prepare the corrective action plan. <br /> If you have any questions, please contact me at(209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, Senior REHS Margaret Lagorio,REHS <br /> Site Mitigation Unit Supervisor <br /> enclosure <br /> cc: Interested party list <br />