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Page 28 of 33 <br /> alscience �o \'6 <br /> �oF <br /> _nvironmental Quality Control - LCS/LCS Duplicate �° <br /> AM aboratories, Inc. <br /> Q ne <br /> Arcadis US, Inc. Date Received: N/A <br /> 2033 North Main Street, Suite 340 Work Order No: 10-05-0027 <br /> Walnut Creek, CA 94596-3727 Preparation: EPA 5030B <br /> Method: EPA 8021 B <br /> Project: PG&E C-51 Tank Site / B0092341.0000.00001 <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 099-12-657-546 Solid GC 21 05/05/10 05/05/10 100505B0l <br /> Parameter LCS%REC LCSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 113 113 70-118 1 0-7 <br /> Toluene 107 106 71-107 0 0-8 <br /> Ethylbenzene 107 106 66-120 1 0-7 <br /> p/m-Xylene 109 108 66-120 1 0-8 <br /> o-Xylene 105 103 66-114 2 0-9 <br /> RPD-Relative Percent Difference, CL-Control Limit <br /> 7440 Lincoln Way, Garden Grove, CA 92841-1427 . TEL:(714) 895-5494 . FAX: (714) 894-7501 <br />