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Page 12 of 16 <br /> alscience <br /> Anr_nvironmental Quality Control - LCS/LCS Duplicate <br /> i1w 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 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 /> 099-12-709-453 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 /> p-Isopropyltoluene 92 92 80-120 73-127 0 0-20 <br /> Methylene Chloride 84 85 80-120 73-127 1 0-20 <br /> Naphthalene 81 82 80-120 73-127 1 0-20 <br /> n-Propylbenzene 92 91 80-120 73-127 1 0-20 <br /> Styrene 91 89 80-120 73-127 2 0-20 <br /> Ethanol 80 88 56-140 42-154 9 0-20 <br /> 1,1,1,2-Tetrachloroethane 98 97 80-120 73-127 2 0-20 <br /> 1,1,2,2--tetrachloroethane 92 91 80-120 73-127 2 0-20 <br /> Tetrachloroethene 112 116 80-120 73-127 3 0-20 <br /> Toluene 87 88 77-120 70-127 1 0-20 <br /> 1,2,3--f richlorobenzene 88 87 80-120 73-127 1 0-20 <br /> 1,2,4-Trich lorobenzene 87 87 80-120 73-127 1 0-20 <br /> 1,1,1-Trichloroethane 97 99 80-120 73-127 2 0-20 <br /> 1,1,2-Tiichloroethane 90 90 80-120 73-127 0 0-20 <br /> Trichloroethene 94 97 80-120 73-127 3 0-20 <br /> Trichlorofluoromethane 111 110 80-120 73-127 1 0-20 <br /> 1,2,3-Trichloropropane 92 92 80-120 73-127 1 0-20 <br /> 1,2,4-Trimethylbenzene 93 91 80-120 73-127 2 0-20 <br /> 1,3,5-Trimethylbenzene 94 93 80-120 73-127 1 0-20 <br /> Vinyl Acetate 78 80 80-120 73-127 2 0-20 <br /> Vinyl Chloride 95 97 68-122 59-131 2 0-20 <br /> Xylenes(total) 91 90 80-120 73-127 2 0-20 <br /> Methyl t-Butyl Ether(MTBE) 88 91 77-120 70-127 4 0-20 <br /> Tert-Butyl Alcohol(TBA) 83 95 68-122 59-131 14 0-20 <br /> Diisopropyl Ether(DIPE) 86 87 78-120 71-127 1 0-20 <br /> Ethyl-t-Butyl Ether(ETBE) 89 92 78-120 71-127 3 0-20 <br /> Tert-Amyl-Methyl Ether(TAME) 90 92 75-120 68-128 2 0-20 <br /> Total number of LCS compounds: 65 <br /> Total number of ME compounds: 1 <br /> Total number of ME compounds allowed: 3 <br /> LCS ME CL validation result: Pass <br /> RPD-Relative Percent Difference, CL-Control Limit <br /> W" <br /> 7440 Lincoln Way, Garden Grove, CA 92841-1427 . TEL:(714) 895-5494 . FAX: (714) 894-7501 <br />