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Analysis Repoirt Lancaster Laboratories Page 3 of 7 Quality Control Summary Client Name: ChevronTexaco Group Number: 837315 Reported: 01/27/03 at 10 :52 AM Sample Matrix Quality Control MS MSD MS/MSD RPD BKG DUP DUP Dup RPD Analysis Name %REC %REC Limits RPD MAX Conc Conc RPA Max Methyl t-butyl ether 103 104 69-134 1 30 di-Isopropyl ether 106 108 68-133 2 30 Ethyl t-butyl ether 97 99 73-123 2 30 t-Amyl methyl ether 96 97 69-118 2 30 t-Butyl alcohol 119 124 51-148 5 30 Benzene 114 115 78-134 1 30 1,2-Dichloroethane 116 115 73-136 1 30 Toluene 114 112 83-127 2 30 1,2-Dibromoethane 105 105 78-120 1 30 Ethylbenzene 112 113 82-134 1 30 Xylene (Total) 113 113 82-130 0 30 Batch number: N030121AA Sample number(s) : 3975837-3975839,3975841-3975844 Ethanol 116 115 34-163 0 30 Methyl t-butyl ether 101 101 69-134 0 30 di-Isopropyl ether 106 105 68-133 0 30 jjWyl t-butyl ether 96 99 73-123 2 30 yl methyl ether 96 97 69-118 1 30 t-Butyl alcohol 108 108 51-148 1 30 Benzene 118 116 78-134 2 30 1,2-Dichloroethane 118 115 73-136 3 30 Toluene 114 112 83-127 1 30 1,2-Dibromoethane 105 105 78-120 0 30 Ethylbenzene 113 112 82-134 1 30 Xylene (Total) 115 113 82-130 2 30 Batch number: N030121AB Sample number(s) : 3975840 Ethanol 116 115 34-163 0 30 Methyl t-butyl ether 101 101 69-134 0 30 di-Isopropyl ether 106 105 68-133 0 30 Ethyl t-butyl ether 96 99 73-123 2 30 t-Amyl methyl ether 96 97 69-118 1 30 t-Butyl alcohol 108 108 51-148 1 30 Benzene 118 116 78-134 2 30 1,2-Dichloroethane 118 115 73-136 3 30 Toluene 114 112 83-127 1 30 1,2-Dibromoethane 105 105 78-120 0 30 Ethylbenzene 113 112 82-134 1 30 Xylene (Total) 115 113 82-130 2 30 Surrogate Quality Control *-Outside of specification 1) The result for one or both determinations was less than five times the LOQ. The background result was more than four times the spike added. Lancaster Laboratories,Inc. MEMBER 2425 New Holland Pike PO Box 12425 M104M Lancaster,PA 17605-2425 OA in 717-656-2300 Fax:717-656-2681