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Lancaster <br /> Laboratories Analysis Report � <br /> 2425 New Holland Pike PO Box 12425 Lancaster PA 17605-2425-717 6%2300 Fax 717 656 2681•www IancaSterlabs com <br /> Page 2 of 3 <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number 893337 <br /> Reported 05/05/04 at 10 30 AM <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BKG DVP DUP Dup RPD <br /> Analysis Name %REC %RBC Limits RPD MAX Conc canc RPB Max <br /> di-Isopropyl ether 100 100 75-130 0 30 <br /> Ethyl t-butyl ether 104 103 78-119 0 30 <br /> t-Amyl methyl ether 108 105 77-117 3 30 <br /> t-Butyl alcohol 91 92 51-147 1 30 <br /> Benzene 109 109 83-128 0 30 <br /> Toluene 109 109 83-127 0 30 <br /> Ethylbenzene 109 109 82-129 0 30 <br /> Xylene (Total) 110 109 82-130 1 30 <br /> Batch number P0412SIAA Sample number(s) 4260022-4260024 <br /> Ethanol 108 106 41-155 2 30 <br /> Methyl Tertiary Butyl Ether 102 93 69-134 3 30 <br /> di-Isopropyl ether 99 90 75-130 9 30 <br /> Ethyl t-butyl ether 99 92 78-119 8 30 <br /> t-Amyl methyl ether 106 96 77-117 10 30 <br /> t-Butyl alcohol 116 106 51-147 8 30 <br /> Benzene 122 110 83-128 5 30 <br /> Toluene 97 94 83-127 4 30 <br /> Ethylbenzene 99 93 82-129 5 30 <br /> Xylene (Total} 101 95 82-130 6 30 <br /> Surrogate Quality Control <br /> Analysis Name TPH-GRO - Waters <br /> Batch number 0411SA16A <br /> Trifluorotoluene-F <br /> 4260021 122 <br /> 4260022 124 <br /> 4260023 124 <br /> 4260024 123 <br /> 4260025 124 <br /> Blank 124 <br /> LCS 127 <br /> LCSD 127 <br /> MS 126 <br /> Limits 57-146 <br /> Analysis Name Methanol and Ethanol <br /> Batch number 041200015A <br /> Acetone <br /> 4260022 101 <br /> 4260023 104 <br /> 4260024 102 <br /> Blank 100 <br /> LCS 103 <br /> MS 105 <br /> MSD 92 <br /> Limits 80-132 <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 />