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Page 20 of 33 <br /> alscience <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> aboratories, Inc. <br /> ne <br /> Arcadis US, Inc. Date Received: 05/01/10 <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 /> Proiect PG&E C-51 Tank Site / B0092341.0000.00001 <br /> Date Date MS/MSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 10-04-2073-1 Solid GC 21 05/04/10 05/04/10 100504S01 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 112 97 58-118 14 0-24 <br /> Toluene 103 82 61-109 23 0-20 4 <br /> Ethylbenzene 99 72 59-113 32 0-20 4 <br /> p/m-Xylene 101 72 55-115 33 0-20 4 <br /> o-Xylene 98 69 56-110 34 0-20 4 <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 />