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Lancaster Laboratories <br />Where quality is a science. <br />Quality Control Summary <br />Client Name: ChevronTexaco Group Number: 822883 <br />Reported: 09/27/02 at 01:13 PM <br />Sample Matrix Quality Control <br />143 MSD MS/MSD RPD BKO DUP <br />Analypis Name- <br />%REC <br />REC <br />Limits <br />RPD <br />MAX Conc <br />Ethanol <br />56 <br />64 <br />34-163 <br />13 <br />30 <br />Methyl t -butyl ether <br />91 <br />92 <br />69-134 <br />1 <br />30 <br />di -Isopropyl ether <br />68 <br />89 <br />68-133 <br />1 <br />30 <br />Ethyl t -butyl ether <br />88 <br />90 <br />73-123 <br />2 <br />30 <br />t -Amyl methyl ether <br />69 <br />90 <br />69-116 <br />0 <br />30 <br />t -Butyl alcohol <br />76 <br />BO <br />51-148 <br />5 <br />30 <br />Benzene <br />102 <br />104 <br />78-134 <br />2 <br />30 <br />1,2-Dichloroethane <br />95 <br />96 <br />73-136 <br />1 <br />30 <br />Toluene <br />101 <br />102 <br />83-127 <br />2 <br />30 <br />1,2-Dibromoethane <br />93 <br />95 <br />78-120 <br />2 <br />30 <br />Ethylbenzene <br />101 <br />103 <br />82-134 <br />1 <br />30 <br />Xylene (Total) <br />104 <br />104 <br />82-130 <br />1 <br />30 <br />Batch number: N022601AA <br />Sample <br />number(s): <br />3898981 <br />Ethanol <br />70 <br />70 <br />34-163 <br />0 <br />30 <br />Methyl t -butyl ether <br />103 <br />105 <br />69-134 <br />1 <br />30 <br />di -Isopropyl ether <br />86 <br />86 <br />68-133 <br />0 <br />30 <br />Ethyl t -butyl ether <br />86 <br />86 <br />73-123 <br />0 <br />30 <br />t -Amyl methyl ether <br />90 <br />90 <br />69-118 <br />0 <br />30 <br />t -Butyl alcohol <br />85 <br />65 <br />51-148 <br />1 <br />30 <br />Benzene <br />104 <br />104 <br />78-134 <br />0 <br />30 <br />2-Dichloroethane <br />92 <br />92 <br />73-136 <br />0 <br />30 <br />luene <br />98 <br />100 <br />83-127 <br />1 <br />30 <br />2-Dibromoethane <br />91 <br />91 <br />78-120 <br />0 <br />30 <br />thylbenzene <br />101 <br />100 <br />82-134 <br />1 <br />30 <br />Xylene (Total) <br />102 <br />103 <br />82-130 <br />1 <br />30 <br />Surrogate Quality Control <br />Analysis Name: TBH-GRO - Waters <br />Batch number: 02259A51A <br />Trifluorotoluene-F <br />Cone <br />Page 2 of 3 <br />DUP <br />RPD <br />3898975 <br />82 <br />3898976 <br />88 <br />3898977 <br />82 <br />3898978 <br />86 <br />Blank <br />86 <br />LCS <br />94 <br />LCSD <br />93 <br />MS <br />94 <br />57-146 <br />Analysis Name: TPH-GRO - Waters <br />Batch number: 02259ASIB <br />Trifluorotoluene-F <br />3898979 86 <br />Blank 86 <br />LCS 94 <br />DUP <br />RPD <br />Max <br />*- Outside of specification , <br />(1) 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 />Lancaster, 17605-2425 <br />717-b56-230000 Fax' 717-656-2681 2216 Rev. 9111!00 <br />