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Lancaster Laboratories Page 2 of 4 <br /> Where qualityis a science. <br />' Quality Control Summary <br /> Client Name: ChevronTexaco Group Number: 610519 <br /> Reported: 06/20/02 at 08:22 PM <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BKG DUP DUP Dup <br />' RPD <br /> Analysis Name %REC PRBC Limits RPD MAX Cono Conc RPD Max <br /> Batch number: U021611AA Sample number(s) - 3832619-3832623 <br /> Ethanol 111 137* 70-130 21 30 <br /> Methyl t-hutyl ether 105 92 69-134 4 30 <br /> di-Isopropyl ether 107 101 68-133 5 30 <br /> Ethyl t-butyl ether 100 94 73-123 6 30 <br /> t-Amyl methyl ether 96 90 69-118 6 30 <br /> t-Butyl alcohol 92 88 51-148 4 30 <br /> Benzene 103 99 78-134 4 30 <br /> 1,2-Dichloroethane 114 106 75-141 6 30 <br /> Toluene 105 109 78-133 4 30 <br /> 1,2-Dibromoethane 99 100 78-120 1 30 <br /> Ethylbenzene 106 109 82-134 2 30 <br /> Xylene (Total) 105 104 81-136 1 30 <br /> Batch number: U021611AB Sample number(s) : 3832623-3832626 <br /> Ethanol 111 137* 70-130 21 30 <br /> Methyl t-butyl ether 105 92 69-134 4 30 <br /> di-Isopropyl ether 107 101 68-133 5 30 <br /> Ethyl t-butyl ether 100 94 73-123 6 30 <br /> t-Amyl methyl ether 96 90 69-118 6 30 <br /> t-Butyl alcohol 92 88 51-148 4 30 <br /> Benzene 103 99 78-134 4 30 <br /> 1,2-Dichloroethane 114 106 75-141 6 30 <br /> Whuene 105 109 78-133 4 30 <br /> -Dibromoethane 99 100 78-120 1 30 <br /> ylbenzene 106 109 82-134 2 30 <br /> Xylene (Total) 105 104 81-136 1 30 <br /> Batch number: U021611AC Sample number(s) : 3832623-3832625 <br /> Benzene 103 99 78-134 4 30 <br /> Toluene 105 109 78-133 4 30 <br /> Xylene (Total) 105 104 81-136 1 30 <br /> Surrogate Quality Control <br /> Analysis Name: TPH-GRO - Waters <br /> Batch number: 02161A56A <br /> Trifluorotoluene-F <br /> 3832619 100 <br /> 3832620 99 <br /> 3832621 99 <br /> 3832622 99 <br /> 3832623 97 <br /> 3832624 104 <br /> 3832625 98 <br /> 3832626 99 <br /> Blank 99 <br /> LCS 109 <br /> LCSD 108 <br /> MS 117 <br /> Limits: 67-135 <br /> Analysis Name: TPH - DRO CA LUFT (Waters) <br /> *-Outside of specification <br /> The result for one or both determinations was less than five times the LOQ. <br /> I ) The background result was more than four times the spike added. <br /> Lancaster Laboratories,Inc. <br /> M E M B E R 2425 New Holland Pike <br /> PO Box 12425 <br /> � Lancaster,PA 17605-2425 <br /> 717.656-2300 Fax:717-656-2681 2216 Rev.9/11/00 <br />