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Lancaster <br /> Laboratories Analysis Rep ort <br /> 2425 New Holland Poke PO Box 12425 Lancasler PA 17605-2425•717 656-2300 Fax 717 656-2681 www IancaSterlabS COM <br /> Page 7 of 7 <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number 931884 <br /> Reported 02/25/05 at 10 34 AM <br /> Surrogate Quality Control <br /> 4465288 91 88 92 90 <br /> Blank 90 87 91 89 <br /> LCS 89 87 91 90 <br /> MS 90 90 92 91 <br /> MSD 90 90 92 92 <br /> Limits 81-120 82-112 85-112 83-113 <br /> Analysis Name STEX+5 Oxygenates+EDC+EDB+ETON <br /> Batch number Z050541AA <br /> Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene <br /> 4465287 90 90 92 90 <br /> Blank 90 89 92 90 <br /> LCS 90 90 91 92 <br /> MS 91 90 92 91 <br /> MSD 90 91 92 91 <br /> Limits 81-120 82-112 85-112 83-113 <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 />