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Page 23 of 29 <br /> alscience <br /> �_nvironmentai Quality Control - LCS/LCS Duplicate <br /> Am 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 /> 099.12-709-451 Solid GC/MS UU 12114110 12/14/10 1012141-01 <br /> Parameter LCS%REC LCSD%REC %REC CL ME CL RPD RPD CL Qualifiers <br /> Benzene 100 104 78-120 71-127 3 0-20 <br /> Bromobenzene 99 103 80-120 73-127 4 0-20 <br /> Bromochloromethane 94 96 80-120 73-127 2 0-20 <br /> Bromodichloromethane 103 105 80-120 73-127 1 0-20 <br /> Bromoform 107 107 80-120 73-127 0 0-20 <br /> Bromomethane 90 93 80-120 73-127 4 0-20 <br /> n-Butylbenzene 101 103 77-123 69-131 3 0-25 <br /> sec-Butylbenzene 102 104 80-120 73-127 2 0-20 <br /> tert-Butylbenzene 104 106 80-120 73-127 2 0-20 <br /> Carbon Disulfide 100 104 80-120 73-127 4 0-20 <br /> Carbon Tetrachloride 99 104 49-139 34-154 5 0-20 <br /> Chlorobenzene 97 99 79-120 72-127 3 0-20 <br /> Chloroethane 102 107 80-120 73-127 5 0-20 <br /> Chloroform 94 97 80-120 73-127 3 0-20 <br /> Chloromethane 107 110 80-120 73-127 3 0-20 <br /> 2-Chlorotoluene 96 97 80-120 73-127 1 0-20 <br /> 4-Chlorotoluene 102 102 80-120 73-127 0 0-20 <br /> Dibromochloromethane 102 105 80-120 73-127 3 0-20 <br /> 1,2-Dibromo-3-Chloropropane 112 116 80-120 73-127 4 0-20 <br /> 1,2-Dibromoethane 101 102 80-120 73-127 1 0-20 <br /> Dibromomethane 100 102 80-120 73-127 3 0-20 <br /> 1,2-Dichlorobenzene 98 100 75-120 68-128 2 0-20 <br /> 1,3-Dichlorobenzene 99 103 80-120 73-127 4 0-20 <br /> 1,4-Dichlorobenzene 94 96 80-120 73-127 2 0-20 <br /> Dichlorodifluoromethane 117 122 80-120 73-127 5 0-20 <br /> 1,1-Dichloroethane 94 98 80-120 73-127 5 0-20 <br /> 1,2-Dichloroethane 100 103 80-120 73-127 3 0-20 <br /> 1,1-Dichloroethene 105 109 74-122 66-130 5 0-20 <br /> c-1,2-Dichloroethene 96 99 80-120 73-127 3 0-20 <br /> t-1,2-Dichloroethene 95 99 80-120 73-127 4 0-20 <br /> 1,2-Dichloropropane 99 103 79-115 73-121 5 0-25 <br /> 1,3-Dichloropropane 98 98 80-120 73-127 0 0-20 <br /> 2,2-Dichloropropane 104 105 80-120 73-127 1 0-20 <br /> 1,1-Dichloropropene 96 99 80-120 73-127 3 0-20 <br /> c-1,3-Dichloropropene 114 118 80-120 73-127 3 0-20 <br /> t-1,3-D ichloropropene 114 116 80-120 73-127 1 0-20 <br /> Ethylbenzene 99 103 76-120 69-127 5 0-20 <br /> Isopropylbenzene 104 107 80-120 73-127 3 0-20 <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 />