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Lancaster <br /> Laboratories • <br /> Page 4 of 5 <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number 839185 <br /> Reported 02/12/03 at 02 58 PM <br /> Surrogate Quality Control <br /> LCS 103 <br /> LCSD 102 <br /> MS 106 <br /> Limits 57-146 <br /> Analysis Name BTEX + Oxygenates by 8260B <br /> Batch number N030291AA <br /> Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene <br /> 3984048 93 92 99 94 <br /> Blank 94 92 99 92 <br /> LCS 91 92 101 97 <br /> MS 91 92 100 96 <br /> MSD 91 90 100 95 <br /> Limits 86-118 80-120 88-110 86-115 <br /> Analysis Name BTEX + Oxygenates by 8260B <br /> Batch number P030301AA <br /> Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene • <br /> 3984038 101 100 97 92 <br /> 3984039 100 99 97 93 <br /> 3984040 101 101 96 96 <br /> 3984041 100 98 98 94 <br /> 3984042 100 100 98 93 <br /> 3984043 99 97 96 97 <br /> 3984044 100 98 96 91 <br /> 3984045 100 101 97 93 <br /> 3984046 101 98 96 91 <br /> 3984047 100 99 96 90 <br /> Blank 99 96 96 95 <br /> LCS 99 101 97 95 <br /> MS 99 104 97 94 <br /> MSD 100 95 97 93 <br /> Limits 86-118 80-120 88-110 86-115 <br /> Analysis Name 8260 Master Scan (water) <br /> Batch number P030311AA <br /> Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene <br /> Blank 102 98 96 92 <br /> LCS 100 99 98 95 <br /> MS 101 99 96 95 <br /> MSD 99 100 96 93 <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 /> Lancaster Laboratories Inc <br /> M E M B E R 2425 New Hotland Pike <br /> PO Box 12425 <br /> Lancaster PA 17605-2425 <br /> 717 656 2300 Fax 717 656-2681 <br />