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Yi . Reolort Lancaster Laboratories Page 1 of 1 d Where quality is ascience Quality Control Summary Client Name Chevron Products Company Group Number 806117 Reported 05/15/02 at 02 32 PM Laboratory Compliance Quality Control Blank Blank Report LCS LCSD LCS/LCSD Analysis Name Result KDL units %REC REC Limits RFD RPD Max Batch number 02123A51A Sample number(s) 3814031 Benzene N D 0 5 ug/1 105 104 80-118 1 30 Toluene N D 0 5 ug/1 107 105 82-119 2 30 Ethylbenzene N D 0 5 ug/1 106 104 81-119 2 30 Total Xylenes N D 1 5 ug/1 109 107 82-120 2 30 Methyl tent-Butyl Ether N D 2 5 u9/1 111 114 79-127 3 30 TPH-GRO - Waters N D 50 ug/l 93 96 76-126 4 30 Batch number 021240008A Sample number(s) 3814031 TPH - DRO CA LUFT (Waters) N D 50 ug/1 70 86 54-120 21* 20 Sample Matrix Quality Control M3 NSD M3/MSD RPD BKG D13P DUP DuP RPD Analysis Name $REC %REC Limits RPD MAX Cone Conc RPD Max Batch number 02123A51A Sample number(s) 3814031 Benzene 115 77-131 Toluene 120 80-128 Sthylbenzene 117 76-132 Total Xylenes 120 76-132 Methyl tert-Butyl Ether 113 61-144 1TPH-GRO - Waters 115 74-132 Surrogate Quality Control Analysis Name TPH-GRO - Waters Batch number 02123A51A Trifluorotoluene-F Trifluorotoluene-P 3814031 95 95 Blank 97 94 LCS 108 96 LCSD 105 97 MS 111 92 Limits 67-135 71-130 Analysis Name TPH - DRO CA LUFT (Waters) Batch number 021240008A Orthoterphenyl 3814031 80 Blank 84 LCS 85 LCSD 95 Limits 59-139 *-Outside of specification 1) The result for one or both determinations was less than five times the LOQ The background result was more than four times the spike added Lancaster Laboratories Inc M E M B E R 2425 New Holland Pike PO Box 12425 Lancaster PA 17605-7425 717 656 2300 fax 717 656-2681 2216 Rev 9111/00