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"adratfan"-4adraffan@seoorcom> <br /> Tc, alraoe@sequvlalabs.corn> <br /> r + <br /> Data: 416104 4 39PM <br /> 1)What sample are the EPA 4181, pH and 6TEWPWMTBE by 8260 on line*9 <br /> assocaated with? <br /> 4 <br /> The analyses indicated on rine 9 should be for the effluent water sample <br /> 2) Need to verify that the TPH listed with the 8260 BTEX1MTBE is for <br /> TPH-Gas <br /> Yes, this is TPH-Gas <br /> 3) May we sobstitute Method 1664 with silica gel clean up for method EPA <br /> 418.17 The major difference between the two methods is the extraction fluid <br /> EPA 18 uses Freon 113 and Method 1664 uses Hexane. Method 1664 has been <br /> approved for use with most regulatory agencies with the exception of NPOES <br /> mondorlag, If this project is regulated,you should checkwith your <br /> regulator before approving any substtution <br /> This should be fine. <br /> Thanks <br /> Lamy Draffan <br /> Staff Englneer <br /> SEC OR-Sa=rnento Office <br /> (996)8610400 ext 235 <br /> adraffan@secor com <br />