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� LancasterAnalysis nalys�s Report <br />' 2425 New Holland Pike PD Box 12425 Lancaster PA 17605 2425 717 656 2300 Fax 717 656 2681 www Iancasteriabs com <br /> Page 4 of 8 <br />' Quality Control Summary <br /> Client Name ChevronTexaco Group Number 883197 <br /> Reported 02/12/04 at 08 28 AM <br /> Sample Matrix Quality Control <br /> NS MSD MS/MSB RPD BKG DUP DUP Dup <br /> RPD <br /> Analysis Nama PRBC %RBC Limits RPD MAX Conc Conc RPD Max <br />' Methyl Tertiary Butyl Ether 99 83 69-134 10 30 <br /> di-Isopropyl ether 109 106 75-130 2 30 <br /> Ethyl t-butyl ether 102 99 78-119 3 30 <br /> t-Amyl methyl ether 99 96 77-117 3 30 <br /> t-Butyl alcohol 104 111 51-147 7 30 <br />' Benzene 100 99 83-128 2 30 <br /> 1,2-Dichloroethane 103 102 73-136 1 30 <br /> Toluene 100 80* 83-127 18 30 <br /> 1,2-Dibromoethane 91 88 78-120 3 30 <br /> Ethylbenzene 99 89 82-129 10 30 <br /> Xylene (Total} 100 77* 82-130 20 30 <br /> Batch number P040402AA Sample number(s) 4207727 <br /> Methyl Tertiary Butyl Ether 90 68 69-134 3 30 <br />' Surrogate Quality Control <br /> Name TPH-GRO - Waters <br /> ,Analysis <br /> Satoh number 04034A07B <br /> Trlfluarotoluene->:' <br /> 4207699 74 <br /> 4207700 74 <br /> 4207701 74 <br /> 4207702 74 <br /> 4207703 74 <br /> 4207704 74 <br /> 4207705 75 <br />' 420770 74 <br /> 42077077 74 <br /> 4207708 75 <br /> Blank 74 <br /> LCS 92 <br />' LCSD 97 <br /> MS 102 <br /> Limits 57-146 <br /> Analysis Name TPH-GRO - Waters <br />' Batch number 04034A07C <br /> Trifluorotoluene-F <br /> 4207709 74 <br /> 4207710 75 <br />' 4207711 75 <br /> 4207712 77 <br /> 4207713 76 <br /> 4207714 76 <br /> Blank 74 <br />' LCS 92 <br /> LCSD 47 <br /> MS 102 <br />' *-Outside of specification <br /> (1) 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 />