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Page 21 of 29 <br /> a/science <br /> '_nvironmental Quality Control - LCS/LCS Duplicate <br /> s aboratories, Inc. <br /> STANTEC Date Received: N/A <br /> 3017 Kilgore Road, Suite 100 Work Order No: 10-12-1102 <br /> Rancho Cordova, CA 95670-6141 Preparation: EPA 5030C <br /> Method: EPA 8260B <br /> Project: ARCO Service Station No. 6080 <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 099-12-709-452 Solid GC/MS Z 12/14/10 12/14/10 101214L01 <br /> Parameter LCS%REC LCSD%REC %REC CL ME CL RPD RPD CL Qualifiers <br /> Benzene 88 89 78-120 71-127 2 0-20 <br /> Bromobenzene 93 94 80-120 73-127 1 0-20 <br /> Bromochloromethane 96 94 80-120 73-127 2 0-20 <br /> Bromodichloromethane 91 95 80-120 73-127 4 0-20 <br /> Bromoform 92 95 80-120 73-127 3 0-20 <br /> Bromomethane 106 96 80-120 73-127 11 0-20 <br /> n-Butylbenzene 88 90 77-123 69-131 2 0-25 <br /> sec-Butylbenzene 90 91 80-120 73-127 1 0-20 <br /> tert-Butylbenzene 89 89 80-120 73-127 0 0-20 <br /> Carbon Disulfide 94 95 80-120 73-127 1 0-20 <br /> Carbon Tetrachloride 93 95 49-139 34-154 2 0-20 <br /> Chlorobenzene 91 91 79-120 72-127 0 0-20 <br /> Chloroethane 98 100 80-120 73-127 2 0-20 <br /> Chloroform 92 92 80-120 73-127 0 0-20 <br /> Chloromethane 91 99 80-120 73-127 9 0-20 <br /> 2-Chlorotoluene 92 93 80-120 73-127 0 0-20 <br /> 4-Chlorotoluene 88 89 80-120 73-127 1 0-20 <br /> Dibromochloromethane 95 96 80-120 73-127 2 0-20 <br /> 1,2-Dibromo-3-Chloropropane 91 95 80-120 73-127 4 0-20 <br /> 1,2-Dibromoethane 92 93 80-120 73-127 0 0-20 <br /> Dibromomethane 91 93 80-120 73-127 2 0-20 <br /> 1,2-Dichlorobenzene 89 90 75-120 68-128 2 0-20 <br /> 1,3-Dich!orobenzene 89 88 80-120 73-127 0 0-20 <br /> 1,4-Dichlorobenzene 87 87 80-120 73-127 0 0-20 <br /> Dichlorodifluoromethane 141 142 80-120 73-127 1 0-20 <br /> 1,1-Dichloroethane 90 92 80-120 73-127 2 0-20 <br /> 1,2-Dichloroethane 92 95 80-120 73-127 3 0-20 <br /> 1,1-Dichloroethene 91 92 74-122 66-130 1 0-20 <br /> c-1,2-Dichloroethene 90 91 80-120 73-127 2 0-20 <br /> t-1,2-Dichloroethene 89 89 80-120 73-127 0 0-20 <br /> 1,2-Dichloropropane 88 91 79-115 73-121 3 0-25 <br /> 1,3-Dichloropropane 90 93 80-120 73-127 3 0-20 <br /> 2,2-Dichloropropane 91 93 80-120 73-127 2 0-20 <br /> 1,1-Dichloropropene 90 90 80-120 73-127 0 0-20 <br /> c-1,3-Dichloropropene 89 90 80-120 73-127 2 0-20 <br /> t-1,3-Dichloropropene 94 94 80-120 73-127 0 0-20 <br /> Ethylbenzene 91 92 76-120 69-127 1 0-20 <br /> Isopropylbenzene 93 95 80-120 73-127 2 0-20 <br /> r 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 />