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Lancaster Laboratories <br /> Where quality Is a science. <br />' Page I of 4 <br /> Quality Control Summary <br /> Client Name: chevronTexaco Group Number: 623136 <br /> Reported: 10/04/02 at 03 :47 PM <br /> 1 Laboratory Compliance Quality Control <br /> Blank Blank Report LCS LCSD LCS/LCSD <br /> Analysis Name Result MDL Units %REC %REC Limits RPD RPD Max <br /> Batch number: 0226IA53A Sample number(s) : 3900369-3900375 <br /> TPH-GRO - Waters N.D. 50. ug/l 100 93 74-116 7 30 <br /> Batch number: 022620025A Sample number(s) : 3900369-3900374 <br /> TPH - DRO CA LUFT (Waters) N.D. 25. ug/l 86 83 54-120 4 20 <br /> Batch number: 022620027A Sample number(s) : 3900369-3900374 <br /> Total TPH N.D. 200. ug/l 92 91 71-117 1 20 <br /> TPH Motor Oil C16-C36 N.D. 400. ug/l <br /> Batch number: 022630004A Sample number(s) : 3900369 <br /> Methanol (by Direct Injection) N.D. 200- ug/1 100 64-130 <br /> Batch number: 022740008A Sample number(s) : 3900370-3900374 <br /> Methanol (by Direct Injection) N.D. 200. ug/1 96 64-130 <br />' Batch number: N022672AA Sample number(s) : 3900369-3900372 <br /> Ethanol N.D. 50. ug/l 76 43-159 <br /> Methyl t-butyl ether N.D. .5 ug/1 102 77-127 <br /> di-Isopropyl ether N.D. 5 ug/l 92 74-125 <br />' hyl t-butyl ether N.D. .5 ug/l 89 74-120 <br /> Amyl methyl ether N.D. .5 ug/l 89 71-114 <br /> Butyl alcohol N.D. 5. ug/l 87 59-139 <br /> Benzene N.D. .5 ug/1 104 85-117 <br /> 1,2-Di chloroethane N-D. .5 ug/l 104 77-132 <br />' Toluene N.D. .5 ug/l 100 85-115 <br /> 1,2-Dibromoethane N.D. .5 ug/l 85 81-114 <br /> Ethylbenzene N.D. .5 ug/l 102 82-119 <br /> Xylene (Total) N.D. -5 ug/1 95 84-120 <br />' Batch number: N022672AB Sample number(s) : 3900373-3900374 <br /> Ethanol N.D. 50. ug/l 76 43-159 <br /> Methyl t-butyl ether N-D. .5 u9/1 102 77-127 <br /> di-Isopropyl ether N.D. .5 u9/1 92 74-125 <br /> Ethyl t-butyl ether N.D. .5 u19/1 89 74-120 <br /> t-Amyl methyl ether N.D- .5 ug/l 89 71-114 <br /> t-Butyl alcohol N.D. 5. ug/1 87 59-139 <br /> 1,2-Dichloroethane N.D. .5 ug/i 104 77-132 <br /> 1,2-Dibromoethane N.D. .5 ug/l 85 81-114 <br /> Ethylbenzene N.D. .5 ug/1 102 82-119 <br />' Batch number: N022672AC Sample number(s) : 3900373-3900375 <br /> Methyl t-butyl Ether N.D. -5 ug/l 102 77-127 <br /> Benzene N.D. .5 ug/l 104 85-117 <br /> Toluene N.D. -5 ug/1 100 85-115 <br /> Ethylbenzene N.D. .5 ug/1 102 82-119 <br />' Xylene (Total) N.D. .5 ug/1 95 84-120 <br /> Sample Matrix Quality Control <br />' MS MSD M$/MSD RPD BKG DUP DUP Dup <br /> RPD <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 /> Lancaster Laboratories,Inc- <br /> M E M B E R 2425 New Holland Pike <br /> —midPO Box 12425 <br /> lar,PA 17605-7475 <br /> 717-G56-7.656.73000ll Fix:717-656-2681 2216 Rev.9/11/00 <br />