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4 <br /> 4,1 Lancaster Report <br /> Laboratories Analysis p <br /> 2425 New Holland PAG PO Box 12425 Lancaster PA 1760-5-2425,717 656 2300 Fax 717 656-2681•www tancaslerlabs corn <br /> Page 2 of 5 <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number 941828 <br /> Reported 05/13/05 at 10 55 AM <br /> Laboratory Compliance Quality Control <br /> Blank Blank Report LCS LCSD LCS/LCSD <br /> Analysis Name Result MDL Units %REC %REC Limits RPA RPD Max <br /> 1 2-Dichloroethane N D 2 ug/1 100 77-132 <br /> Toluene N D 5 ug/l 104 85-115 <br /> 1,2-Dibromoethane N D 2 ug/l 101 81-114 <br /> Ethylbenzene N D 5 ug/l 103 82-119 <br /> Xylene (Total) N D 5 ug/1 108 83-113 <br /> Batch number Z051291AA Sample numbers) 4516329-4516330 <br /> Ethanol N D 500 ug/1 95 30-155 <br /> Methyl Tertiary Butyl Ether N D 2 ug/l 96 77-127 <br /> di-Isopropyl ether N D 2 ug/1 89 67-130 <br /> Ethyl t-butyl ether N D 2 ug/1 92 74-120 <br /> t-Amyl methyl ether N D 2 ug/1 98 79-113 <br /> t-Butyl alcohol N D 100 ug/l 103 57-141 <br /> Benzene N D 5 ug/1 98 85-117 <br /> 1,2-Dichloroethane N D 2 ug/1 103 77-132 <br /> Toluene N D 5 ug/1 108 85-115 <br /> 1,2-Dibromoethane N D 2 ug/1 103 81-114 <br /> Ethylbenzene N D 5 ug/1 107 82-119 <br /> Xylene (Total) N D 5 ug/l 112 83-113 <br /> • Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BRG DUP DUP Dup RPD <br /> Analysis Name %REC %RSc Limits RPD MAX Conc Conc RPD Max <br /> Batch number 052310027A Sample number(s) 4516326-4516327,4516329-4516330 <br /> Methanol (by Direct In3ection) 108 108 88-126 0 20 <br /> Batch number OS131AOBB Sample number($) 4516321-4516328 <br /> TPH-GRO - Waters 119 63-154 <br /> Batch number 05131AOBC Sample number(s) 4516329-4516330 <br /> TPH-GRO - Waters 119 63-154 <br /> Batch number 2051251AA Sample number(S) 4516326 <br /> Ethanol 102 99 26-153 3 30 <br /> Methyl Tertiary Butyl Ether 101 101 69-134 1 30 <br /> di-Isopropyl ether 95 96 75-130 1 30 <br /> Ethyl t-butyl ether 99 9B 78-119 1 30 <br /> t-Amyl methyl ether 303 104 77-117 1 30 <br /> t-Butyl alcohol 105 102 51-147 3 30 <br /> Benzene 105 104 63-128 0 30 <br /> 1,2-Dichloroethane 107 107 73-136 0 30 <br /> Toluene 112 112 83-127 0 30 <br /> 1 2-Dibromoethane 105 105 78-120 0 30 <br /> Ethylbenzene 113 113 82-129 0 30 <br /> Xylene (Total) 116 116 82-130 0 30 <br /> Batch number Z051252AA sample number(s) 4516321-4516325,4516328 <br /> Methyl Tertiary Butyl Ether (2) (2) 69-134 0 30 <br /> Benzene 100 100 83-128 0 30 <br /> Toluene 100 103 83-127 3 30 <br /> Ethylbenzene 100 102 82-129 2 30 <br /> *-Outside of specification <br /> (1) The result for one or both determinations was less than five times the LOQ <br /> 02) The background result was more than four times the spike added <br />