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N <br /> M <br /> t <br /> Page 2 of 2 <br /> A survey must also be conducted to identify any potential conduits that would allow <br /> vertical or lateral migration of contaminants in groundwater. This survey should also <br /> cover a radius of 2,000 feet from the site, and can be combined with the physical <br /> survey for wells. <br /> } <br /> Continue quarterly groundwater monitoring at the site until otherwise directed by y <br /> PHS/EHD. Groundwater samples must be analyzed quarterly for TPHg, TPHd by EPA <br /> Method 8015; BTEX by EPA Method 8020; oxygenates, 1,2 dichloroethane, ethylene <br /> dibromide, methanol and ethanol by EPA Method 8260. All analytical results must be 1 <br /> k <br /> tabulated in quarterly monitoring reports. <br /> A work plan to determine the lateral and vertical extent of groundwater 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 REHS at (209) 468-3440 if you have questions regarding this <br /> letter. <br /> Donna Heran, Director <br /> Environmental Health Division' <br /> I <br /> } <br /> Carol Oz, Senior REHS Dot Lofstrom, RG <br /> Site Mitigation Unit IV Engineering Geologist, Unit 1V <br /> cc: Marty Hartzell-CVRWQCB <br /> Philip Cox-URS Greiner ` <br /> A.K. Jain-Dept. of General Services <br /> i <br /> f <br /> h <br /> } <br />