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21 <br /> 15600 Harlan Rd <br /> Page 2 of 2 <br /> A Work Plan to further investigate grouAdwater at this site and address the potential off site migration of <br /> contaminants should be submitted to PHS/EHD by May 20,20K <br /> Continue quarterly monitoring of all monitoring wells for TPHg,BTEX,and Oxygenates until otherwise <br /> directed by this office. Analyze groundwater samples for 1,TDCA,ethanol and methanol during the next <br /> ti <br /> sampling event. Depending on the analytical results for these potential contaminants,their addition to the <br /> quarterly monitoring regime at the site may be necessary. <br /> 4 <br /> Contact Carol 0z,Senior REHS at(209}468-3440 if you have questions regarding this letter. <br /> Donna Henan,RENS,Director <br /> Environmental Health.Division <br /> 6X2� <br /> Carol Oz,Senior REHS Margaret Ngorio, HS <br /> Site Mitigation Unit IV Supervisor <br /> cc: Marty Hartzell-CVRWQCB <br /> Gordon Boggs-CVRWQCB <br /> Trevor Santochi-Avalon Environmental <br /> j <br /> is r <br /> Fi <br />