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Darpetro <br /> Page 2 of 2 <br /> Indicate the locations of existing Underground Storage Tanks (UGT's) and dispensers, <br /> former UGT's and dispensers and all wells (including vapor extraction wells) on all maps <br /> in future reports and work plans. <br /> Specify the MW's where Oxygen Replacement Compounds (ORC) have been installed. <br /> Evaluate the effectiveness of ORC in reducing contaminants in the groundwater at this <br /> site. If ORCs from certain MW's have been removed, discuss the reasons for removal. <br /> In each Quarterly Monitoring Report this information should be updated. <br /> Submit a Work Plan for determining the vertical extent of contamination and the <br /> installation of additional MWs to PHS/EHD by July 13, 1998 . Continue sampling all <br /> wells quarterly and include the additional analysis as specified above. Contact Carol Oz, <br /> Senior REHS, at (209)468-3440 if you have questions regarding this letter. <br /> Donna Heran, Director <br /> Environmental Health Division <br /> Carol Oz, Senior REHS Margaret agorio, REHS <br /> Site Mitigation Unit IV Supervisor <br /> cc: Mark List-CVRWQCB <br /> Mel Jacobo-SWRCB <br /> John Cussens-CA Geophysical Group <br /> I <br /> I <br /> f <br /> I <br /> i <br /> i <br /> i <br /> i <br /> 1. <br />