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Lancaster <br /> Laboratories <br />' Page 2 of 5 <br /> Quality Control Summary <br />' Client Name: ChevronTexaco Group Number: 833457 <br /> Reported: 12/20/02 at 06: 01 PM <br /> I Laboratory Compliance Quality Control <br /> Blank Blank Report LCS LCSD LCS/LCSD <br /> Analysis Name Result MDL Unita %REC %REC Limits RPD RPD Max <br /> Xylene {Total) N-D. .5 ug 1 100 84-120 <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BKG DUP DUP Dup <br />' RPD <br /> Analysis Name 96REC %REC Limits RPD MAIC Conc Conc RPD Max <br /> Batch number: 0234OA16A Sample number(s) - 3954918 <br />' TPH-GRO - Waters 110 74-132 <br /> Batch number: 0234OA16B Sample number(s) : 3954912-3954915 <br /> TPH-GRO - Waters 110 74-132 <br />' Batch number: 02341A51A Sample number(s) : 3954916-3954917 <br /> TPH-GRO - Waters 123 74-132 <br /> Batch number: 023460023A Sample number(s) : 3954912-3954916 <br /> Methanol (by Direct Injection) 88 85 69-127 4 20 <br /> 4patch number: 023460024A Sample number(s) : 3954917 <br /> ethanol (by Direct Injection) 85 96 69-127 13 20 <br /> Batch number: N023441AA Sample number(s) : 3954918 <br /> Methyl t-butyl ether 92 93 69-134 1 30 <br /> Benzene 111 111 78-134 0 30 <br /> Toluene 109 107 83-127 2 30 <br /> Ethylbenzene 106 106 82-134 1 30 <br /> Xylene (Total) 109 108 82-130 1 30 <br />' Batch number: N023451AA Sample number(s) : 3954912-3954913 <br /> Ethanol 60 66 34-163 10 30 <br /> Methyl t-butyl ether 87 90 69-134 2 30 <br /> di-Isopropyl ether 85 86 68.133 1 30 <br /> Ethyl t-butyl ether 99 100 73-123 1 30 <br /> t-Amyl methyl ether 92 92 69-118 0 30 <br /> t-Butyl alcohol 87 88 51-148 1 30 <br /> Benzene 106 106 78-134 0 30 <br /> 1,2-Dichloroethane 95 95 73-136 0 30 <br /> Toluene 104 106 83-127 2 30 <br />' 1,2-Dibromoethane 98 102 78-120 4 30 <br /> Ethylbenzene 103 104 82-134 1 30 <br /> Xylene (Total) 103 104 82-130 1 30 <br /> Batch number: N023452AA Sample number(a) : 3954914-3954917 <br /> Ethanol 79 73 34-163 8 30 <br /> Methyl t-butyl ether 93 98 69-134 2 30 <br /> di-Isopropyl ether 84 85 68-133 1 30 <br /> Ethyl t-butyl ether 99 101 73-123 2 30 <br /> t-Amyl methyl ether 93 94 69-118 1 30 <br /> 1 t-Butyl alcohol 103 100 51-148 3 30 <br /> Benzene 108 111 78-134 2 30 <br /> 1,2-Dichloroethane 98 99 73-136 1 30 <br /> Toluene 104 103 83-127 1 30 <br />' *- Outside of specification <br /> (1) The result for one or both determinations was less than five times the LOQ. <br /> 02) The background result was more than four times the spike added. <br /> Lancaster Laboratories,Inc. <br />' t1M E M 13 E R 2425 New Holland Pike <br /> PO Bax 12425 <br /> Lanca® 717.65 -2 00 1Fax:71425 <br /> 717656-2300 Fax:717-65fi-2667 2216 Rev. 10/2/02 <br />