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LancasterAnalysis Laboratories Analysis Report 2425[Vew HaEland Pike,PO Box 12425,Lancaster,Pk 17605-2425•717-656-2300 Fax:717-65&2fi81•www.lancasterlatrs.cDm Page 2 of 4 Quality Control Summary Client Name: ChevronTexaco Group Number: 934602 Reported: 03/15/05 at 04 :21 PM Analysis Name REC %REc Limits RPD MAX Conc Conc RPD Max Batch number: 0506BA163 Sample number(s) : 4478000-4478002 TPH-GRD - Waters 120 63-154 Batch number: 05069A16A Sample number{s) : 4478003-4478008 TPH-GRO - Waters 108 114 63-154 6 30 Batch number: Z050702AA Sample number(s) : 4478000-4478002 Ethanol 98 45 26-153 74* 3D Methyl Tertiary Butyl Ether 90 92 69-134 2 30 di-Isopropyl ether 89 90 75-130 1 30 Ethyl t-butyl ether 90 92 78-119 2 30 t-Amyl methyl ether 88 89 77-117 2 30 t-Butyl alcohol 91 64 51-147 35* 30 Benzene 93 96 83-128 3 30 1,2-Dichloroethane 95 95 73-136 0 30 Toluene 97 96 83-127 2 30 1,2-Dibromoethane 90 96 78-120 6 30 Ethylbenzene 98 99 82-129 0 30 Xylene (Total) 98 98 82-130 0 30 Batch number: Z050703AA Sample number(s) : 4478003-4478008 Ethanol 113 106 26-153 6 30 Methyl Tertiary Butyl Ether 93 92 69-134 1 30 di-Isopropyl ether 89 90 75-130 1 30 Ethyl t-butyl ether 92 91 78-119 1 30 t-Amyl methyl ether 90 69 77-117 1 30 t-Butyl alcohol 92 91 51-147 1 30 Benzene 98 96 83-128 1 30 1,2-Dichloroethane 104 102 73-136 2 30 Toluene 100 99 83-127 1 30 1,2-Dibromoethane 93 92 78-120 1 30 Ethylbenzene 103 101 B2-129 2 30 Xylene (Total) 101 100 82-130 1 30 Batch number: Z050712AA Sample number(s) : 4478000 Methyl Tertiary Butyl Ether 101 96 69-134 5 30 t-Butyl alcohol 96 95 51-147 2 30 Surrogate Quality Control Analysis Name: TPH-GRO - Waters Batch number: 05068A16B Trifluorotoluene-E 4478000 97 4478001 118 4478002 98 Blank 98 LCS 101 LCSD 101 MS 99 Limits: 70-142 *-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.