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I t v Lancaster. Report Laboratories Analysis ,p ' = 2425 New Holland Pike,PO Box 12425,Lancaster,PA 17605-2425•717-656-2300 Fax:717-65fi-2681•www.fanca5terlabs.eom E Page 2 of 3 Quality Control Summary Client Name: ChevronTexaco Group Number: 943205 , Reported: 05/25/05 at 10:03 AM p Sample Matrix Quality Control MS MSD MS/MSD RPD BKG DUP DVP Dup RPD Analysise %REC 5RECf Limits RPD MAX Conc Conc RPD Maas , Methyl Tertiary Butyl Ether 106 95 69-134 3 30 Batch number: Z051383AA Sample number(s) : 4523035-4523037 k Ethanol 106 104 26-153 2 30 Methyl Tertiary Butyl Ether 84 91 69-134 9 30 di-Isopropyl ether 84 91 75-130 8 30 Ethyl t-butyl ether 84 92 78-119 B 30 t-Amyl methyl ether 86 93 77-117 9 30 j t-Butyl alcohol 75 84 51-147 10 30 E Benzene 92 98 83-128 7 30 1,2-Dichloroethane 86 93 73-136 8 30 Toluene 95 103 83-127 8 30 1,2-Dibromoethane 88- 94 7B-120 7 30 Ethylbenzene 93 101 82-129 9 30 i Xylene (Total) 94 102 82-130 8 30 Batch number: Z051391AR Sample number(s) : 4523037-4523038 Ethanol 99 104 26-153 5 30 di-Isopropyl ether 103 100 75-130 3 30 3 Ethyl t-butyl ether 101 98 78-119 3 0 t-Amyl methyl ether 99 95 77-117 3 30 ,t-Butyl alcohol 92 90 51-147 2 30 Benzene 106 102 83-128 3 30 1,2-Dichloroethane 107 104 73-136 3 '30 Toluene 105 102 63-127 3 30 1,2-1)ibromoethane 97 94 78-120 3 30 Ethylbenzene 106 103 e2-129 3 30 Xylene (Total) 105 101 82-130 3 30 Surrogate Quality Control Analysis Name: TPH-GRO - Waters Batch number: 05137A16B Trifluorotoluene-F 4523035 97 { 4523036 99 I 4523037 98 4523038 98 Blank 99 LCS 100 LCSO 99 MS 101 Limits: 70-142 I Analysis Name: 8260 Master Scan (water) Batch number: ZC51374AA Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromafluorobenzene j I Blank 91 86 96 87 LCS 92 87 95 :91 *-Outside of specification (1) The result for one or both determinations was less than five times the LOQ. (2) The background result was more than four times the spike added.