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t <br /> i <br /> Page 2 of 2 i <br /> A survey must also be conducted to identify any potential conduits that would allow <br /> II vertical or lateral migration of contaminants inoundwater. This should also <br /> $r survey <br /> cover a radius of 2,000 feet from the site, and can be combined with the physical <br /> survey for wells. <br /> Continue quarterly_groundwater,monitoring at the site until othws :dicted_by- =_� .. <br /> G undwater samples must be analyzed quarterly for TPHg, TPHd by EPA y <br /> Method 8015; 13TEX by EPA Method 8020; oxygenates, 1,2 dichloroethane, ethylene <br /> dibromide, methanol and ethanol by EPA Method 8260. All analytical results must be <br /> tabulated in quarterly monitoring reports. <br /> A workplan.to determine the lateral and vertical extent of izroundwakr contamination at <br /> this site and a well survey-report must be submitted to PHS/EHD by November 30''2000. <br /> Contact Carol Oz, Senior RENS at (209)468-3440 if you have questions regardingthis <br /> letter. <br /> Donna Heran, Director i <br /> Environmental Health Division , <br /> Carol Oz, Senior REHS Dot Lofstrom, RG ' <br /> Site Mitigation Unit IV Engineering Geologist, Unit IV <br /> E <br /> 4 cc: Marty Hartzell-CVRWQCH <br /> Philip Cax-URS Greiner' <br /> A.K. Jain-Dept, of General Services <br /> i <br /> 1 <br /> i <br /> 1 <br /> i <br /> _ ri <br />