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Page 50 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 5030B <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 /> 099-10-006-26,745 Aqueous GUMS RR 08/29/08 08/30/08 0808291-02 <br /> Parameter LCS%REC LCSD%REC %REC CL ME CL RPD RPD CL Qualifiers <br /> Benzene 102 102 84-120 78-126 0 0-8 <br /> Carbon Tetrachloride 123 121 63-147 49-161 1 0-10 <br /> Chlorobenzene 98 99 89-119 84-124 0 0-7 <br /> 1,2-Dibromoethane 103 101 80-120 73-127 2 0-20 <br /> 1,2-Dichlorobenzene 91 92 89-119 84-124 1 0-9 <br /> 1,1-Dichloroethene 115 113 77-125 69-133 2 0-16 <br /> Ethylbenzene 98 98 80-120 73-127 0 0-20 <br /> Toluene 101 102 83-125 76-132 0 0-9 <br /> Trichloroethene 103 106 89-119 84-124 3 0-8 <br /> Vinyl Chloride 109 110 63-135 51-147 1 0-13 <br /> Methyl-t-Butyl Ether(MTBE) 113 108 82-118 76-124 5 0-13 <br /> Tert-Butyl Alcohol(TBA) 114 100 46-154 28-172 13 0-32 <br /> Diisopropyl Ether(DIPE) 103 98 81-123 74-130 5 0-11 <br /> Ethyl-t-Butyl Ether(ETBE) 105 101 74-122 66-130 4 0-12 <br /> Tert-Amyl-Methyl Ether(TAME) 104 102 76-124 68-132 2 0-10 <br /> Ethanol 99 88 60-138 47-151 12 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 />