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Lancaster Laboratories Page 4 of 8 <br />Wh 1kV6fiVro 1 Summar <br />Client Name: ChevronTexaco Group Number: 81.7247 <br />Reported: 08/15/02 at 03:42 PM <br />Sample Matrix Quality Control <br />MS MSD MS/MSD RPD BKO DVP DLiP Dup <br />RPD <br />Analysis Name %REC %REC Limits RPD MAX Cone Conc RPD Max <br />di -Isopropyl ether 89 88 68-133 1 30 <br />Ethyl t -butyl ether 94 95 73-123 0 30 <br />t -Amyl methyl ether 92 90 69-118 1 30 <br />t -Butyl alcohol 86 82 51-148 4 30 <br />Benzene 103 103 78-134 0 30 <br />1,2-Dichloroethane 92 91 73-136 1 30 <br />Toluene 103 100 83-127 3 30 <br />1,2-Dibromoethane 93 90 78-120 3 30 <br />Ethylbenzene 106 103 82-134 2 30 <br />Xylene (Total) 108 105 82-130 3 30 <br />Batch number: P022141AA Sample number(s): 3869034-3869041,3869043-3869047 <br />Ethanol 42 34-163 <br />Methyl t -butyl ether 90 69-134 <br />di -isopropyl ether 87 68-133 <br />Ethyl t -butyl ether 90 73-123 <br />t -Amyl methyl ether 87 69-118 <br />t -Butyl alcohol 78 51-148 <br />f <br />zene 108 78-134 <br />Dichloroethane 93 73-136 <br />uene 107 83-127 <br />1,2-Dibromoethane 94 78-120 <br />Ethylbenzene 107 82-134 <br />Xylene (Total) 109 82-130 <br />Batch number: P022141AB Sample number(B): 3869042 <br />Ethanol 42 34-163 <br />Methyl t -butyl ether 90 69-134, <br />di -Isopropyl ether 87 68-133 <br />Ethyl t -butyl ether 90 73-123 <br />t -Amyl methyl ether 87 69-118 <br />t -Butyl alcohol 78 51-148 <br />Benzene 108 78-134 <br />1,2-Dichloroethane 93 73-136 <br />Toluene .107 83-127 <br />1,2-Dibromoethane 94 78-120 <br />Ethylbenzene 107 82-134 <br />Xylene (Total) 109 82-130 <br />Surrogate Quality Control <br />Analysis Name: TPH-GRO - Waters <br />Batch number: 02213ASIA <br />Trifluorotoluene-F <br />"- Outside of specification <br />The result for one or both determinations was less than five times the LOQ. <br />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 />WMV Lancaster, PA 17605-2425 <br />717-656-2300 Fax: 717-656-2681 <br />2216 Rev.9111100 <br />