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Page 51 of 56 <br /> alscience <br /> =nvironmental Quality Control - LCS/LCS Duplicate <br /> Aw aboratories, Inc. <br /> Parsons Date Received: N/A <br /> 2121 North California Blvd., Suite 500 Work Order No: 08-08-2353 <br /> Walnut Creek, CA 94596-7305 Preparation: EPA 5035 <br /> Method: EPA 8260B <br /> Project: Former Tracy MGP <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 095-01-025-16,696 Solid GUMS QQ 09/03/08 09/03/08 0809031-01 <br /> Parameter LCS%REC LCSD%REC %REC CL ME CL RPD RPD CL Qualifiers <br /> Benzene 105 102 85-115 80-120 3 0-11 <br /> Carbon Tetrachloride 90 86 68-134 57-145 4 0-14 <br /> Chlorobenzene 99 97 83-119 77-125 2 0-9 <br /> 1,2-Dibromoethane 93 93 80-120 73-127 1 0-20 <br /> 1,2-Dichlorobenzene 99 101 57-135 44-148 1 0-10 <br /> 1,1-Dichloroethene 95 90 72-120 64-128 6 0-10 <br /> Ethylbenzene 92 91 80-120 73-127 2 0-20 <br /> Toluene 102 99 67-127 57-137 3 0-10 <br /> Trichloroethene 104 100 88-112 84-116 4 0-9 <br /> Vinyl Chloride 121 110 57-129 45-141 9 0-16 <br /> Methyl-t-Butyl Ether(MTBE) 93 90 76-124 68-132 3 0-12 <br /> Tert-Butyl Alcohol(TBA) 100 99 31-145 12-164 1 0-23 <br /> Diisopropyl Ether(DIPE) 126 120 74-128 65-137 5 0-10 <br /> Ethyl-t-Butyl Ether(ETBE) 109 105 77-125 69-133 4 0-9 <br /> Tert-Amyl-Methyl Ether(TAME) 98 95 81-123 74-130 3 0-10 <br /> Ethanol 106 89 44-152 26-170 18 0-24 <br /> Total number of LCS compounds: 16 <br /> Total number of ME compounds : 0 <br /> Total number of ME compounds allowed: 1 <br /> LCS ME CL validation result: Pass <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 />