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• Page 12 of 24 <br />alscience \40 <br />nvironmental Quality Control - Spike/Spike Duplicate <br />Mill <br />All aboratories, Inc. <br />Conestoga -Rovers & Associates Date Received: 04/26/08 <br />19449 Riverside Drive, Suite 230 Work Order No: 08-04-2322 <br />Sonoma, CA 95476-6955 Preparation: EPA 50308 <br />Method: LUFT GC/MS / EPA <br />Project 3515 Navy Drive, Stockton, CA <br />Date Date MS/MSD Batch <br />Quality Control Sample lD Matrix Instrument Prepared Analyzed Number <br />08-05-0020-5 Solid GC/MS LL 05/06108 05107108 080506502 <br />RPD - Relative Percent Difference CL - Control Limit <br />Qualifiers <br />3,4 <br />7440 Lincoln Way, Garden Grove, CA 92841-1427 , TEL:(714) 895-5494 • FAX: (714) 894-7501 <br />MS %REC <br />MSD %REC <br />%REC CL <br />RPD <br />RPD CL <br />Parameter <br />89 <br />84 <br />70-130 <br />6 <br />0-30 <br />Benzene <br />88 <br />89 <br />70-130 <br />2 <br />0-30 <br />Ethylbenzene <br />90 <br />70-130 <br />1 <br />0-30 <br />Toluene <br />90 <br />87 <br />90 <br />70-130 <br />3 <br />0-30 <br />p/m-Xylene <br />90 <br />70-130 <br />2 <br />0-30 <br />o -Xylene <br />88 <br />Methyl -t -Butyl Ether (MTBE) <br />102 <br />85 <br />70-130 <br />16 <br />0-30 <br />Tert-Butyl Alcohol (TBA) <br />100 <br />101 <br />70-130 <br />1 <br />0-30 <br />87 <br />82 <br />70-130 <br />7 <br />0-30 <br />Diisopropyl Ether (DIPE) <br />91 <br />84 <br />70-130 <br />7 <br />0-30 <br />Ethyl -t -Butyl Ether (ETBE) <br />Tert-Amyl-Methyl Ether (TAME) <br />95 <br />87 <br />70-130 <br />8 <br />0-30 <br />42 <br />78 <br />70-130 <br />62 <br />0-30 <br />Ethanol <br />RPD - Relative Percent Difference CL - Control Limit <br />Qualifiers <br />3,4 <br />7440 Lincoln Way, Garden Grove, CA 92841-1427 , TEL:(714) 895-5494 • FAX: (714) 894-7501 <br />