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da <br /> Lancaster Laboratories <br /> • Where quality is a science <br /> Page 2 of 3 <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number 828474 <br /> Reported 11/08/02 at 01 10 PM <br /> Sample Matrix Quality Control <br /> MS NSD MS/MBD RPD BEG DUP Di1P DuP <br /> RFD <br /> Analysis Name RHC %REC Limits RPD MAX Cone Conc RPD Max <br /> t-Amyl methyl ether 93 95 69-118 2 30 <br /> t-Butyl alcohol 103 103 51-148 0 30 <br /> Benzene 112 113 78-134 0 30 <br /> Toluene 115 115 83-127 0 30 <br /> Ethylbenzene 115 117 82-134 1 30 <br /> Xylene (Total) 115 116 82-130 1 30 <br /> Batch number N023052AA Sample number(s) 3928607,3928609-3928616 <br /> Ethanol 84 89 34-163 5 30 <br /> Methyl t-butyl ether 100 100 69-134 0 30 <br /> di-isopropyl ether 93 94 68-133 1 30 <br /> Ethyl t-butyl ether 92 94 73-123 2 30 <br /> t-Amyl methyl ether 98 99 69-118 2 30 <br /> t-Butyl alcohol 94 95 51-146 1 30 <br /> Benzene 112 113 78-134 1 30 <br /> Toluene 112 113 83-127 1 30 <br /> Ethylbenzene 114 116 82-134 2 30 <br /> Xylene (Total) 114 115 82-130 1 30 <br /> I <br /> Surrogate Quality Control <br /> Analysis Name TPH-GRO - Waters <br /> Batch number 0230OA16A <br /> Trifluorotoluene-F <br /> 3928606 106 <br /> 3928607 116 <br /> 3928608 136 <br /> 3928609 114 <br /> 3928610 118 <br /> 3928611 132 <br /> 3928612 119 <br /> 3928613 121 <br /> 3928614 115 <br /> Blank 113 <br /> LCS 133 <br /> LCSD 119 <br /> MS 120 <br /> Limits 57-146 <br /> Analysis Name TPH-GRO - Waters <br /> Batch number 0230OA16B <br /> Trifluorotoluene-F <br /> 3928615 119 <br /> Blank 118 <br /> LCS 133 <br /> LCSD 119 <br /> MS 120 <br /> *-Outside of specification <br /> (l) The result for one or both determinations was less than five times the LOQ <br /> (2) 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 PA 17605 2425 <br /> 717 656 2300 Fax 717 656 2681 2216 Rev 9111100 <br />