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Lancaster <br /> Laboratories Q n a I ysis Report <br /> 2425 New Holland Pike PO Box 12425 Lantasler PA 176052425•717-656-2300 Fax 717656-2681 www lancasterlab5 Com <br /> Page 3 of 7 <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number 931884 <br /> Reported 02/25/05 at 10 34 AM <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BX(# DUP DUP Dup RPD <br /> Analvafs Name $REC %R13C Lxmita RPD MAX Conc Cone RPD Max <br /> Methanol (by Direct Infection) 96 96 68-130 0 20 <br /> Batch number Z050492AA Sample number(s) 4465277 <br /> Methyl Tertiary Butyl Ether 95 94 69-134 1 30 <br /> Benzene 102 99 83-128 3 30 <br /> Toluene 108 104 83-127 4 30 <br /> Ethylbenzene 104 103 62-129 1 30 <br /> Xylene (Total) 105 104 82-130 1 30 <br /> Batch number Z050531AA Sample number(s) 4465279-4465286 <br /> Ethanol 99 96 33-153 3 30 <br /> Methyl Tertiary Butyl Ether 91 88 69-134 2 30 <br /> di-Isopropyl ether 94 93 75-130 0 30 <br /> Ethyl t-butyl ether 94 94 78-119 1 30 <br /> t-Amyl methyl ether 92 91 77-117 1 30 <br /> t-Butyl alcohol 90 89 51-147 2 30 <br /> Benzene 97 96 83-128 1 30 <br /> 1,2-Dichloroethane 94 94 73-136 1 30 <br /> Toluene 97 97 83-127 0 30 <br /> 1,2-Dibromoethane 91 92 78-120 1 30 <br /> Ethylbenzene 99 98 82-129 1 30 <br /> Xylene (Total) 97 97 82-130 0 30 <br /> Batch number Z050532AA Sample number(s) 4465278 <br /> Ethanol 129 94 33-153 32* 30 <br /> Methyl Tertiary Butyl Ether 92 89 69-134 1 30 <br /> di-Isopropyl ether 101 100 75-130 1 30 <br /> Ethyl t-butyl ether 100 98 78-119 2 30 <br /> t-Amyl methyl ether 99 99 77-117 0 30 <br />�t=Butyl--alcohol 91 94 52-147-3-30 - - - <br /> Benzene 104 104 83-128 0 30 <br /> 1,2-Dichloroethane 107 110 73-136 1 30 <br /> Toluene 105 105 63-127 0 30 <br /> 1,2-Dibromoethane 102 95 78-120 8 30 <br /> Ethylbenzene 105 105 82-129 0 30 <br /> Xylene (Total) 103 104 82-130 0 30 <br /> Batch number Z050533AA Sample number(s) 4465268 <br /> Ethanol 100 98 33-153 2 30 <br /> Methyl Tertiary Butyl Ether 87 88 69-134 1 30 <br /> di-Isopropyl ether 91 92 75-130 1 30 <br /> Ethyl t-butyl ether 90 91 78-119 1 30 <br /> t-Amyl methyl ether 66 89 77-117 2 30 <br /> t-Butyl alcohol 88 Be 51-147 0 30 <br /> Benzene 94 94 83-128 0 30 <br /> 1,2-Dnchloroethane 93 93 73-136 0 30 <br /> Toluene 95 96 83-127 1 30 <br /> 1,2-Dibromoethane 88 89 78-120 1 30 <br /> Ethylbenzene 97 97 82-129 1 30 <br /> Xylene (Total) 95 95 82-130 0 30 <br /> Batch number Z050541AA Sample number(s) 4465287 <br /> Ethanol 94 98 33-153 4 30 <br /> Methyl Tertiary Butyl Ether 90 90 69-134 1 30 <br /> di-Isopropyl ether 93 93 75-130 1 30 <br /> *-Outside of specification <br /> (1) The result for one or both determinations was less than five times the LOQ <br /> (2) The background result was more than four times the spike added • <br />