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Page 4 of 8 <br /> alscience �N ACCO,' <br /> �_nvironmental Quality Control - LCS/LCS Duplicate Q° <br /> AM aboratories, Inc. <br /> Q n e <br /> Arcadis US, Inc. Date Received: N/A <br /> 2033 North Main Street, Suite 340 Work Order No: 10-05-0019 <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 /> 099-12-667-809 Aqueous GC 8 05/07/10 05/07/10 100507B0l <br /> Parameter LCS%REC LCSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 91 96 70-118 6 0-9 <br /> Toluene 94 100 66-114 7 0-9 <br /> Ethylbenzene 95 101 72-114 6 0-9 <br /> p/m-Xylene 97 103 74-116 6 0-9 <br /> o-Xylene 93 99 72-114 6 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 />