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Lancaster <br /> . Laboratories Analysis Report <br /> 1W 2425 New Holland Pike,PO Box 12425,Lancasler,PA 17605-2425-717-656-2300 Fax:717-656-2681•www,lancasteriabs.com <br /> Pagel of 3 <br /> Quality Control Summary <br /> Client Name: ChevronTexaco Group Number: 982959 <br /> Reported: 04/03/06 at 05 :14 PM <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 blame Reault MDL Units %RBC REC Limits RPD RPD Max <br /> Batch number: 06087A20A Sample number(s) : 4736035,4736037 <br /> TPH-GRO - Waters N.D. 50. ug/l 122 113 70-130 7 30 <br /> Batch number: 06087B20A Sample number(s) : 4736034,4736036 <br /> TPH-GRO - Waters N.D. 50. ug/l 103 107 70-130 4 30 <br /> Batch number: Z060921AA Sample number(s) : 4736034-4736037 <br /> Ethanol N.D. 50. ug/l 91 35-166 <br /> Methyl Tertiary Butyl Ether N.D. 0.5 ug/l 94 73-119 <br /> di-Isopropyl ether N.D. 0.5 ug/l 84 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/1 92 79-113 <br /> t-Butyl alcohol N.D. 5. ug/l 80 69-127 <br /> Benzene N.D. 0.5 ug/l 92 85-117 <br /> 1,2-Dichloroethane N.D. 0.5 ug/1 101 77-132 <br /> Toluene N.D. 0.5 ug/l 94 85-115 <br /> 1,2-Dibromoethane N.D. 0.5 ug/l 93 81-114 <br /> Ethylbenzene N.D. 0.5 ug/l 94 82-119 <br /> Xylene (Total) N.D. 0.5 ug/l 98 83-113 <br /> I <br /> Sample Matrix Quality Control <br /> Unspiked (UNSPK) = the sample used in conjunction with the matrix spike <br /> Background (BKG) = the sample used in conjunction with the duplicate <br /> MS MSD MS/MSD RPD BKG DUP DUP Dup RPA <br /> Analysis Name 9sREC RPDM % Conc Conc RPD Max <br /> Batch number: 06087A20A Sample number(s) : 4736035,4736037 UNSPK: P737006 <br /> TPH-GRO - Waters 113 63-154 <br /> Batch number: 06087B20A Sample number(s) . 4736034,4736036 UNSPK: P737007 <br /> TPH-GRO - waters 101 63-154 <br /> Batch number: Z060921AA Sample number(s) : 4736034-4736037 ANSPK: 4736035 <br /> Ethanol 94 92 34-161 2 30 <br /> Methyl Tertiary Butyl Ether 92 87 69-127 5 30 <br /> di-Isopropyl ether 84 So 75-130 4 30 <br /> Ethyl t-butyl ether 86 84 78-119 3 30 <br /> t-Amyl methyl ether 90 89 72-125 2 30 <br /> t-Butyl alcohol 76 75 64-130 1 30 <br /> Benzene 92 90 63-128 2 30 <br /> 1,2-Dichloroethane 97 94 70-143 4 30 <br /> Toluene 93 92 83-127 1 30 <br /> 1,2-Dibromoethane 91 89 78-120 3 30 <br /> Ethylbenzene 94 93 82-129 1 30 <br /> *-Outside of specification <br /> (1) The result for one or bath determinations was less than five times the LOQ. <br /> (2) The background result was more than four times the spike added. <br /> i <br />