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Analysis Report ' ,, Lancaster . Laboratories • Page 2 of 4 Quality Control Summary Client Name- ChevronTexaco Group Number 832126 Reported 12/17/02 at 48 03 PM Sample Matrix Quality Control MS MSD MS/MSD RPD BRCS DUP DUP DuP RPD Analysis Name %"C RBC Limits RPD MAX Conc Conc RPD Max TPH-GRO - Waters 83 85 74-132 3 30 Batch number 023300011A Sample number(s) 3947117-3947125 Methanol (by Direct Injection) 108 108 69-127 0 20 Batch number N023332AA Sample number(s) 3947117-3947123 Ethanol 113 107 34-163 6 30 Methyl t-butyl ether 99 105 69-134 2 30 di-Isopropyl ether 113 114 68-133 1 30 Ethyl t-butyl ether 97 99 73-123 1 30 t-Amyl methyl ether 92 94 69-118 2 30 t-Butyl alcohol 106 105 51-148 1 30 Benzene 112 113 78-134 1 30 1,2-Dichloroethane 111 112 73-136 1 30 Toluene 113 116 83-127 2 30 1,2-Dibromoethane 95 97 78-120 3 30 Ethylbenzene 113 116 82-134 3 30 Xylene (Total) 113 116 82-130 3 30 Batch number N023332AB Sample number(s) 3947124-3947125 Ethanol 113 107 34-163 6 30 . Methyl t-butyl ether 99 105 69-134 2 30 di-Isopropyl ether 113 114 68-133 1 30 Ethyl t-butyl ether 97 99 73-123 1 30 t-Amyl methyl ether 92 94 69-118 2 30 t-Butyl alcohol 106 105 51-148 1 30 Benzene 112 113 78-134 1 30 1,2-Dachloroethane 111 112 73-136 1 30 Toluene 113 116 83-127 2 30 1,2-Dibromoethane 95 97 78-120 3 30 Ethylbenzene 113 116 82-134 3 30 Xylene (Total) 113 116 82-130 3 30 Surrogate Quality Control Analysis Name BTEX, MTBE (8021) Batch number 02329A53A Trifluorotoluene-P Trifluorotoluene-P 3947116 100 95 3947117 93 3947118 99 3947119 96 39471.20 92 3947121. 114 3947122 94 3947123 93 3947124 94 3947125 96 Blank 95 96 LCS 99 95 I *-Outside of specification (1) The result for one or both determinations was less than five times the LOQ . (2) The background result was more than four times the spike added Lancaster Laboratories,Inc M E M B E R 2425 New Holland Pike PO Box 12425 Lancaster PA 17605-2425 7�7_�SF 4nn Fav 717-611;-7f,Ri "Ir oe inr-jrni