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Page 16 of 19 <br /> alscience <br /> =nvironmental Quality Control - LCS/LCS Duplicate Q°ne <br /> AM aboratories, Inc. <br /> f <br /> Parsons Date Received: N/A <br /> 2121 North California Blvd., Suite 500 Work Order No: 09-04-1683 <br /> Walnut Creek, CA 94596-7305 Preparation: EPA 5030B <br /> Method: EPA 8260B <br /> Project: PG&E TRACY MGP SITE <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 099-10-006-29,272 Aqueous GC/MS X 04/23/09 04/23/09 0904231-01 <br /> Parameter LCS%REC LCSD%REC %REC CL ME CL RPD RPD CL Qualifiers <br /> Benzene 97 98 84-120 78-126 1 0-8 <br /> Carbon Tetrachloride 92 97 63-147 49-161 6 0-10 <br /> Chlorobenzene 107 109 89-119 84-124 2 0-7 <br /> 1,2-Dibromoethane 119 120 80-120 73-127 1 0-20 <br /> 1,2-Dichlorobenzene 114 118 89-119 84-124 3 0-9 <br /> 1,1-Dichloroethene 93 96 77-125 69-133 3 0-16 <br /> Ethylbenzene 105 108 80-120 73-127 2 0-20 <br /> Toluene 92 93 83-125 76-132 0 0-9 <br /> Trichloroethene 101 102 89-119 84-124 1 0-8 <br /> Vinyl Chloride 78 84 63-135 51-147 7 0-13 <br /> Methyl-t-Butyl Ether(MTBE) 85 88 82-118 76-124 3 0-13 <br /> Tert-Butyl Alcohol(TBA) 108 108 46-154 28-172 0 0-32 <br /> Diisopropyl Ether(DIPE) 84 88 81-123 74-130 5 0-11 <br /> Ethyl-t-Butyl Ether(ETBE) 88 90 74-122 66-130 2 0-12 <br /> Tert-Amyl-Methyl Ether(TAME) 97 99 76-124 68-132 3 0-10 <br /> Ethanol 110 113 60-138 47-151 2 0-32 <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 />