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Page 18 of 29 <br /> alscience <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> aboratories, Inc. <br /> STANTEC Date Received: 12/14/10 <br /> 3017 Kilgore Road, Suite 100 Work Order No: 10-12-1102 <br /> Rancho Cordova, CA 95670-6141 Preparation: EPA 5030C <br /> Method: EPA 82608 <br /> Project ARCO Service Station No. 6080 <br /> Date Date MS/MSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> T87-A-12 Solid GUM UU 12/14/10 12/14110 101214501 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 104 99 61-127 5 0-20 <br /> Chloroform 95 94 80-120 1 0-20 <br /> 1,1-Dichloroethane 96 94 80-120 2 0-20 <br /> 1,2-Dichloroethane 103 98 80-120 5 0-20 <br /> 1,1-Dichloroethene 106 104 47-143 2 0-25 <br /> Ethanol 105 101 17-167 3 0-47 <br /> Tetrachloroethene 92 94 80-120 2 0-20 <br /> Toluene 99 97 63-123 1 0-20 <br /> Trichloroethene 101 96 44-158 4 0-20 <br /> Methyl-t-Butyl Ether(MTBE) 99 97 57-123 2 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 />