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Page 11 of 16 <br /> alscience <br /> =nvironmental Quality Control - LCS/LCS Duplicate <br /> e <br /> aboratories, Inc. <br /> STANTEC Date Received: N/A <br /> 3017 Kilgore Road, Suite 100 Work Order No: 10-12-1103 <br /> Rancho Cordova, CA 95670-6141 Preparation: EPA 5030C <br /> Method: EPA 82606 <br /> Project: ARCO Service Station No. 6080 <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 099-12-709-453 Solid GC/MS Z 12/15/10 12/15/10 101215L01 <br /> Parameter LCS%REC LCSD%REC %REC CL ME CL RPD RPD CL Qualifiers <br /> Benzene 88 89 78-120 71-127 1 0-20 <br /> Bromobenzene 95 93 80-120 73-127 3 0-20 <br /> Bromochloromethane 91 93 80-120 73-127 2 0-20 <br /> Bromodichloromethane 97 100 80-120 73-127 3 0-20 <br /> Bromoform 102 101 80-120 73-127 1 0-20 <br /> Bromomethane 94 91 80-120 73-127 3 0-20 <br /> n-Butvlbenzene 89 87 77-123 69-131 2 0-25 <br /> sec-Butylbenzene 92 90 80-120 73-127 2 0-20 <br /> tert-Butylbenzene 91 89 80-120 73-127 2 0-20 <br /> Carbon Disulfide 85 85 80-120 73-127 1 0-20 <br /> Carbon Tetrachloride 102 103 49-139 34-154 2 0-20 <br /> Chlorobc nzene 91 90 79-120 72-127 1 0-20 <br /> Chloroethane 96 95 80-120 73-127 1 0-20 <br /> Chlorofcrm 93 93 80-120 73-127 1 0-20 <br /> Chloromethane 97 96 80-120 73-127 1 0-20 <br /> 2-Chlorotoluene 94 92 80-120 73-127 2 0-20 <br /> 4-Chlorotoluene 90 89 80-120 73-127 1 0-20 <br /> Dibromochloromethane 99 99 80-120 73-127 1 0-20 <br /> 1,2-Dibromo-3-Chloropropane 96 102 80-120 73-127 6 0-20 <br /> 1,2-Dibromoethane 92 91 80-120 73-127 2 0-20 <br /> Dibromomethane 93 95 80-120 73-127 2 0-20 <br /> 1,2-Dichlorobenzene 92 90 75-120 68-128 2 0-20 <br /> 1,3-Dichlorobenzene 90 89 80-120 73-127 1 0-20 <br /> 1,4-Dicti!orobenzene 89 87 80-120 73-127 2 0-20 <br /> Dichlorodifluoromethane 145 148 80-120 73-127 1 0-20 <br /> 1,1-Dichloroethane 91 92 80-120 73-127 1 0-20 <br /> 1,2-Dichloroethane 98 100 80-120 73-127 2 0-20 <br /> 1,1-Dichloroethene 91 93 74-122 66-130 2 0-20 <br /> c-1,2-Dichloroethene 86 89 80-120 73-127 3 0-20 <br /> t-1,2-Dichloroethene 87 90 80-120 73-127 3 0-20 <br /> 1,2-Dichloropropane 88 90 79-115 73-121 2 0-25 <br /> 1,3-Dichloropropane 91 90 80-120 73-127 2 0-20 <br /> 2,2-Dichloropropane 94 96 80-120 73-127 2 0-20 <br /> 1,1-Dichloropropene 89 91 80-120 73-127 2 0-20 <br /> c-1,3-Dichloropropene 89 90 80-120 73-127 2 0-20 <br /> t-1,3-Dichloropropene 97 94 80-120 73-127 3 0-20 <br /> Ethylbanzene 92 91 76-120 69-127 1 0-20 <br /> Isopropylbenzene 94 93 80-120 73-127 1 0-20 <br /> RPD-Relative Percent Difference, CL-Control Limit <br /> J" 7440 Lincoln Way, Garden Grove, CA 92841-1427 . TEL:(714) 895-5494 . FAX: (714) 894-7501 <br />