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Lancaster Laboratories <br /> Where quality is a science <br /> Page ] of 3 . <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number 828474 <br /> Reported 11/08/02 at 01 10 PM <br /> Laboratory Compliance Quality Control <br /> Blank Blank Report LCS LCSD LCS/LCSD <br /> Analysig Name Result MDL Units 96REC $REC Limits RPD RPD Max <br /> Batch number 02300A16A Sample number(s) 3928606-3926614 <br /> TPH-GRO - Waters N D 5o ug/1 112 106 74-116 6 30 <br /> Batch number 0230OA16B Sample number(s) 3928615 <br /> TPH-GRO - Waters N D 50 ug/l 112 106 74-116 6 30 <br /> Batch number 02301A16A Sample number(s) 3928616 <br /> TPH-GRO - Waters N D 50 ug/l 107 109 74-116 2 30 <br /> Batch number N023051AA Sample number(s) 3928606,3928608 <br /> Ethanol N D 50 ug/l 91 43-159 <br /> Methyl t-butyl ether N D 5 ug/l 100 77-127 <br /> di-Isopropyl ether N D 5 ug/l 91 74-125 <br /> Ethyl t-butyl ether N D 5 ug/l 91 74-120 <br /> t-Amyl methyl ether N D 5 ug/l 94 71-114 <br /> t-Butyl alcohol N D 5 ug/l 104 59-139 <br /> Benzene N D 5 ug/1 106 85-117 <br /> Toluene N D 5 ug/1 109 85-115 <br /> Ethylbenzene N D 5 ug/l 109 82-119 <br /> Xylene (Total) N D 5 ug/l 110 84-120 <br /> Batch number N023052AA Sample number(s) 3928607,3928609-3928616 <br /> Ethanol N D 50 u9/1 76 43-159 • <br /> Methyl t-butyl ether N D 5 ug/l 99 77-127 <br /> di-Isopropyl ether N D 5 ug/l 90 74-125 <br /> Ethyl t-butyl ether N D 5 u9/1 90 74-120 <br /> t-Amyl methyl ether N D 5 ug/1 93 71-114 <br /> t-Butyl alcohol N D 5 ug/l 97 59-139 <br /> Benzene N D 5 ug/l 105 85-117 <br /> Toluene N D 5 ug/1 106 85-115 <br /> Ethylbenzene N D 5 ug/1 108 82-119 <br /> Xylene (Total) N D 5 ug/1 108 84-120 <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSA RPD BXG DUP DUP DUP <br /> RPD <br /> Analysis Name %REC %REC Limits RPD MAX Conc Conc RPD Max <br /> Batch number 0230OA16A Sample number(s) 3928606-3928614 <br /> TPH-GRO - Waters 120 74-132 <br /> Batch number 0230OA16B Sample number(s) 3928615 <br /> TPH-GRO - Waters 120 74-132 <br /> Batch number 02301A16A Sample numbers) 3928616 <br /> TPH-GRO - Waters 123 74-132 <br /> Batch number N023051AA Sample number(s) 3928606,3928608 <br /> Ethanol 90 94 34-163 4 30 <br /> Methyl t-butyl ether 98 99 69-134 1 30 <br /> di-Isopropyl ether 92 92 68-133 0 30 <br /> Ethyl t-butyl ether 90 92 73-123 2 30 <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 /> MEMBER 2425 New Holland Pike <br /> PO Box 12425 <br /> Lancaster PA 17605 2425 <br /> 717-656 2300 Fax 717 656 2681 2216 Rev 9111/00 <br />