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Page 22 of 31 <br /> alscience <br /> =_nvironmental Quality Control - LCS/LCS Duplicate <br /> aboratories, Inc. <br /> STANTEC Date Received: N/A <br /> 3017 Kilgore Road, Suite 100 Work Order No: 10-12-0722 <br /> Rancho Cordova, CA 95670-6141 Preparation: EPA 5030C <br /> Method: EPA 82608 <br /> Project: ARCO Service Station No. 6080 <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 099-12-709-449 Solid GC/MS Z 12/09/10 12109/10 101209L01 <br /> Parameter LCS %REC LCSD%REC %REC CL ME CL RPD RPD CL Qualifiers <br /> Benzene 93 93 787120 71-127 0 0-20 <br /> Bromobenzene 93 93 80-120 73-127 1 0-20 <br /> Bromochloromethane 92 90 80-120 73-127 2 0-20 <br /> Bromodichloromethane 93 93 80-120 73-127 0 0-20 <br /> Bromoform 96 95 80-120 73-127 1 0-20 <br /> Bromomethane 92 87 80-120 73-127 5 0-20 <br /> n-Butylbenzene 90 87 77-123 69-131 3 0-25 <br /> sec-Butylbenzene 94 92 80-120 73-127 2 0-20 <br /> tent-Butylbenzene 93 90 80-120 73-127 3 0-20 <br /> Carbon Disulfide 107 107 80-120 73-127 0 0-20 <br /> Carbon Tetrachloride 89 90 49-139 34-154 1 0-20 <br /> Chlorobenzene 92 91 79-120 72-127 1 0-20 <br /> Chloroethane 101 100 80-120 73-127 1 0-20 <br /> Chloroform 91 92 80-120 73-127 0 0-20 <br /> Chloromethane 99 96 80-120 73-127 3 0-20 <br /> 2-Chlorotoluene 94 93 80-120 73-127 1 0-20 <br /> 4-Chlorotoluene 92 90 80-120 73-127 3 0-20 <br /> Dibromochloromethane 93 93 80-120 73-127 1 0-20 <br /> 1,2-Dibromo-3-Chloropropane 91 92 80-120 73-127 1 0-20 <br /> 1,2-Dibromoethane 95 94 80-120 73-127 1 0-20 <br /> Dibromomethane 91 92 80-120 73-127 1 0-20 <br /> 1,2-Dichlorobenzene 93 90 75-120 68-128 3 0-20 <br /> 1,3-Dichlorobenzene 91 87 80-120 73-127 4 0-20 <br /> 1,4-Dichlorobenzene 90 88 80-120 73-127 3 0-20 <br /> Dichlorodifluoromethane 121 121 80-120 73-127 0 0-20 <br /> 1,1-Dichloroethane 93 92 80-120 73-127 2 0-20 <br /> 1,2-Dichloroethane 93 92 80-120 73-127 0 0-20 <br /> 1,1-Dichloroethene 91 90 74-122 66-130 1 0-20 <br /> c-1,2-Dichloroethene 92 93 80-120 73-127 1 0-20 <br /> t-1,2-Dichloroethene 92 94 80-120 73-127 2 0-20 <br /> 1,2-Dichloropropane 93 93 79-115 73-121 0 0-25 <br /> 1,3-Dichloropropane 96 94 80-120 73-127 1 0-20 <br /> 2,2-Dichloropropane 91 91 80-120 73-127 0 0-20 <br /> 1,1-Dichloropropene 92 92 80-120 73-127 0 0-20 <br /> c-1,3-Dichloropropene 97 95 80-120 73-127 1 0-20 <br /> t-1,3-Dichloropropene 94 94 80-120 73-127 0 0-20 <br /> Ethylbenzene 94 94 76-120 69-127 0 0-20 <br /> Isopropylbenzene 95 94 80-120 73-127 1 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 />