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Lancaster Laboratories <br /> • Where quality is a science. <br /> Page 4 of 4 <br /> Quality Control Summary <br /> Client Name: ChevronTexaco Group Number: 823136 <br /> Reported: 10/04/02 at 03 :47 PM <br />' Surrogate Quality Control. <br /> Blank 301 <br /> LCS 103 <br /> MS 100 <br /> MSD 102 <br />' Limits: 72-128 <br /> Analysis Name: BTEX + Oxygenates by 8260B <br /> Batch number: 11022672AA <br />' Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene <br /> 3900369 3.03 90 95 98 <br /> 3900370 103 92 95 97 <br /> 3900371 103 91 95 96 <br />' 3900372 104 93 95 97 <br /> Blank 103 94 96 96 <br /> LCS 101 90 97 101 <br /> MS 102 89 97 101 <br /> MSD 102 90 97 101 <br />' Limits: 86-118 80-120 88-110 86-115 <br /> Analysis Name: BTEX + Oxygenates by 8260B <br /> Batch number: 11022672AB <br />' Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene <br /> —3900373 101 88 95 100 <br /> 3900374 100 89 97 102 <br /> Blank 104 93 95 96 <br />' LCS 101 90 97 101 <br /> MS 102 89 97 101 <br /> MSD 102 90 97 101 <br /> Limits: 86-118 80-120 88-110 86-115 <br />' Analysis Name: BTEX + Oxygenates by 8260B <br /> Batch number: N022672AC <br /> Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene <br />' 3900375 102 92 97 96 <br /> Blank 103 91 97 96 <br /> LCS 101 90 97 101 <br /> MS 102 89 97 101 <br /> MSD 102 90 97 101 <br />' Limits: 86-118 80-120 88-110 86-115 <br /> I � <br /> Outside of specification <br /> 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 /> 1 <br /> Lancaster Laboratories,Inc. <br />' M E M B B 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 />