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Lancaster <br /> Laboratories Analysis Rep <br /> 2425 New Holland Pike PO Box 12425 Lancaster,PA 17605.2425•717-656 2300 Fax 717-656-2681•www lancaslerlabs com <br /> Page 2 of 4 <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number 892231 <br /> Reported 04/28/04 at 01 50 PM <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BRG DUP DUP Dup RPD <br /> Analysis Name %REC REC Limits RPD MAX Cgnc Conc RPD Max <br /> Batch number 04107A08A Sample number(s) 4254842,4254845 <br /> TPH-GRO - waters 125 63-154 <br /> Batch number 04107AOBE Sample number(s) 4254840-4254841,4254843-4254844,4254846-4254850 <br /> TPH-GRO - waters 125 63-154 <br /> Batch number P041111AA Sample number(s) 4254841-4254849 <br /> Ethanol 112 115 41-155 3 30 <br /> Methyl Tertiary Butyl Ether 102 102 69-134 0 30 <br /> di-Isopropyl ether 98 98 75-130 0 30 <br /> Ethyl t-butyl ether 99 99 76-119 0 30 <br /> t-Amyl methyl ether 103 102 77-117 1 30 <br /> t-Butyl alcohol 108 111 51-147 3 30 <br /> Benzene 107 106 83-128 1 30 <br /> Toluene 98 101 83-127 2 30 <br /> Ethylbenzene 99 99 82-129 0 30 <br /> Xylene (Total) 101 100 82-130 0 30 <br /> Batch number P041112AA Sample number(s) 4254840 <br /> Methyl Tertiary Butyl Ether 108 101 69-134 5 30 <br /> Benzene 114 109 83-126 4 30 • <br /> Toluene 113 110 83-127 2 30 <br /> Ethylbenzene 114 110 62-129 4 30 <br /> Xylene (Total) 115 111 82-130 3 30 <br /> Batch number P041122AA Sample number(s) 4254842,4254850 <br /> Ethanol 110 115 41-155 4 30 <br /> Methyl Tertiary Butyl Ether 101 102 69-134 1 30 <br /> di-Isopropyl ether 98 100 75-130 3 30 <br /> Ethyl t-butyl ether 99 100 78-119 1 30 <br /> t-Amyl methyl ether 105 103 77-117 2 30 <br /> t-Butyl alcohol 129 134 53-147 3 30 <br /> Benzene 107 107 83-128 0 30 <br /> Toluene 104 103 83-127 1 30 <br /> Ethylbenzene 105 105 82-129 0 30 <br /> Xylene {Total) 105 106 82-130 1 30 <br /> Surrogate Quality Control <br /> Analysis Name TPH-GRO - waters <br /> Batch number 04107AOBA <br /> Trlfluorotoluene-F <br /> 4254842 119 <br /> 4254645 114 <br /> Blank 116 <br /> LCS 109 <br /> LCSD 105 <br /> MS lI6 <br /> Limits 57-146 <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 />