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Frontier <br /> Page 2 of 2 <br /> Continue quarterly sampling and analysis of groundwater from all MWS for Benzene, <br /> Toluene, Xylene and Ethylbenzene, using EPA Method 8020, Total Petroleum <br /> Hydrocarbon as gas and Total Petroleum Hydrocarbon as diesel using EPA Method <br /> 8015m and Methyl Tertiary Butyl Ether using EPA method 8260 until otherwise directed <br /> by PHS/EHD. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Carol Oz, Senior REHS Margo, REHS <br /> Site Mitigation Unit IV Supervisor <br /> cc: Mark List-CRWQCB <br /> Hiram Garcia-Blakely Environ. Investigation, Inc. <br />