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Page 7 of 11 <br /> alscience <br /> =nvironmenta/ Quality Control - LCS/LCS Duplicate <br /> mw aboratories, Inc. � � <br /> Conestoga-Rovers &Associates Date Received: N/A <br /> 19449 Riverside Drive, Suite 230 Work Order No: 10-07-1508 <br /> Sonoma, CA 95476-6955 Preparation: N/A <br /> Method: EPA TO-15 <br /> Project: Mountain House, Neighborhood C+D,Tracy, CA <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 097-09-002-9,079 Air, GCIMS YY N/A 07121/10 100721L01 <br /> Parameter LCS%REC LCSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 102 96 60-156 6 040 <br /> Toluene 107 98 56.146 9 043 <br /> Ethylbenzene 116 106 52-154 9 0-38 - <br /> p/m-Xylene 119 111 42-156 8 0-41 <br /> o-Xylene 117 109 52-148 7 0-38 <br /> RPD-Relative Percent Difference, CL- <br /> ILI Limit <br /> 7440 Lincoln Way, Garden Grove, CA 92841-1427 . TEL:(714)895-5494 . FAX: (714)894-7501 <br />