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Page 19 of 31 <br /> alscience <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> aboratories, Inc. <br /> STANTEC Date Received: 12/09/10 <br /> 3017 Kilgore Road, Suite 100 Work Order No: 10-12-0722 <br /> Rancho Cordova, CA 95670-6141 Preparation: EPA 5030C <br /> Method: EPA 82606 <br /> Prosect ARCO Service Station No. 6080 <br /> Date Date MS/MSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> D-2-3.5 Solid GCIMS UU 12/09110 12/09110 101209501 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 99 95 61-127 4 0-20 <br /> Chloroform 97 91 80-120 6 0-20 <br /> 1,1-Dichloroethane 95 92 80-120 3 0-20 <br /> 1,2-Dichloroethane 96 91 80-120 5 0-20 <br /> 1,1-Dichloroethene 100 94 47-143 6 0-25 <br /> Ethanol 95 91 17-167 5 0-47 <br /> Tetrachloroethene 100 97 80-120 2 0-20 <br /> Toluene 95 90 63-123 6 0-20 <br /> Trichloroethene 98 91 44-158 7 0-20 <br /> Methyl-t-Butyl Ether(MTBE) 92 89 57-123 3 0-21 <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 />