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+ i <br /> Lancaster, <br /> �4 <br /> M Laboratories Analysis Report <br /> 2425 New Holland Pike,PO Box 12425,Lancaster,PA 17605-2425•717-656-2300 Fax;717-656-2681•www.lancasteriabs.com J <br /> Pagel of 3 <br /> I <br /> l <br /> Quality Control Summary <br /> a <br /> Client Name: Chev'ronTexaco Group Number: 943205 <br /> Reported: 05/25/05 at 10:03 AM <br /> Matrix QC may not be reported if site-specific QC samples were not <br /> submitted. In these situations,to demonstrate precision and accuracy at <br /> a batch level,a LCS/LCSD was performed,unless otherwise specified in the <br /> method. <br /> Laboratory Compliance Quality Control <br /> Blank Blank Report LCS LCSD LCS/LCSD <br /> Analysis Name Result MDL Units ` %REC %REC Limits RPD RPA Max i <br /> Batch number: OS137AIGB Sample number{s) : 4523035-4523038 <br /> TPH-GRO - Waters N.D. 50. ug/l 96 96 70-13,0 0 30 <br /> Batch number: Z051374AA Sample number(s) : 4523035-4523036,4523038 <br /> Methyl Tertiary Butyl Ether N.D. 0.5 ug/l 91 77-127 <br /> Batch number: Z051383AA Sample number{s) : 4523035-4523037 <br /> Ethanol N.D. 50. ug/l 94 30-155 <br /> Methyl Tertiary Butyl Ether N.D. 0.5 ug/l 89 77-127 <br /> di-Isopropyl ether N.D. 0.5 ug/1 86 67-130 <br /> Ethyl t-butyl ether N.D. 0.5 ug/l 88 74-120 <br /> t-Amyl methyl ether N.D. 0.5 ug/l 92 79-113 <br /> -G t--Butyl alcohol N.D. 5. ug/1 84 57-141 <br /> Benzene N.D. 0.5 ug/l 92 85-117 <br /> 1,2-Dichloroethane N.D. 0.5 ug/l 90 77-132 <br /> Toluene N.D. 0.5 ug/l 95 85-115 <br /> 1,2-Dibromoethane N.D. 0.5 ug/1 93 81-114 <br /> Ethylbenzene N.D. 0.5 ug/l 93 82-119 _ <br /> ° Xylene (Total) N.D. 0.5 ug/1 95 83-113 <br /> Batch number: Z051391AS Sample numher(s) : 4523037-4523038 <br /> Ethanol N.D. 50. ug/1 113 30-155 <br /> di-Isopropyl ether N.D. 0.5 ug/l 91 67-130 ' <br /> Ethyl t-butyl ether N.D. 0.5 ug/1 91 74-120 <br /> a t-Amyl methyl ether N.D. 0.5 ug/1 92 79-113 <br /> t-Butyl alcohol N.D. 5. ug/1 82 57-141 <br /> Benzene N.D. 0.5 u9/1 94 85-117 i <br /> 1,2-Dichloroethane N.D. 0.5 u9/1 88 77-132 <br /> Toluene N.D. 0.5 u9/1 95 85-115 <br /> 1,2-Dibromoethane N.D. 0.5 ug/1 92 81-114 <br /> Ethylbenzene N.D. 0.5 ug/1 93 82-119 <br /> Xylene (Total) N.D. 0.5 ug/1 94 83-113 <br /> Sample Matrix Quality Control " <br /> MS MSD MS/MSD RPD BKG DUP' DUP Dup RPD <br /> , <br /> Analysis Name $REC $REC Limits RPD MAX Cone Cone RPD Max <br /> Batch number: 05137A16B Sample number(s) : 4523035-4523038 <br /> TPH-GRO - Waters 111 63-154 <br /> f <br /> 4 <br /> Batch number: Z051374AA Sample number(s) : 4523035-4523036,4523038 <br /> h <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 /> s <br /> " <br />