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Page 52 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 /> 095-01-025-16,698 Solid GUMS JJ 09/04/08 09/04/08 0809041-02 <br /> Parameter LCS%REC LCSD%REC %REC CL ME CL RPD RPD CL Qualifiers <br /> Benzene 97 93 85-115 80-120 4 0-11 <br /> Carbon Tetrachloride 96 94 68-134 57-145 3 0-14 <br /> Chlorobenzene 102 99 83-119 77-125 3 0-9 <br /> 1,2-Dibromoethane 96 96 80-120 73-127 1 0-20 <br /> 1,2-Dichlorobenzene 100 99 57-135 44-148 1 0-10 <br /> 1,1-Dichloroethene 107 103 72-120 64-128 4 0-10 <br /> Ethylbenzene 104 100 80-120 73-127 4 0-20 <br /> Toluene 101 97 67-127 57-137 4 0-10 <br /> Trichloroethene 100 97 88-112 84-116 3 0-9 <br /> Vinyl Chloride 114 109 57-129 45-141 4 0-16 <br /> Methyl-t-Butyl Ether(MTBE) 95 98 76-124 68-132 2 0-12 <br /> Tert-Butyl Alcohol(TBA) 65 63 31-145 12-164 3 0-23 <br /> Diisopropyl Ether(DIPE) 104 104 74-128 65-137 0 0-10 <br /> Ethyl-t-Butyl Ether(ETBE) 80 82 77-125 69-133 2 0-9 <br /> Tert-Amyl-Methyl Ether(TAME) 80 79 81-123 74-130 1 0-10 ME <br /> Ethanol 124 121 44-152 26-170 3 0-24 <br /> Total number of LCS compounds: 16 <br /> Total number of ME compounds : 1 <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 />