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Lancaster <br /> Laboratories Analysis Report <br /> 2425 New Holland Pike,PO Box 12425,Lancaster,PA 17605-2425•717.656-2300 Fax:717-656-2681•WWW.lancasterlabs.com <br /> Page 3 of 5 <br /> Quality Control Summary <br /> Client Name: ChevronTexaco Group Number: 893483 <br /> Reported: 05/11/04 at 11:17 AM <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BKG DUP DUP Dup RPD <br /> Analysis Name %REC %REC Limits RPD MAX Conc Conc RPD Ma`x <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 /> 1,2-Dichloroethane 97 91 73-136 7 30 <br /> Toluene 97 94 83-127 4 30 <br /> 1,2-Dibromoethane 95 90 78-120 6 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 - DRO CA LUFT (Waters) <br /> Batch number: 041170001A <br /> Orthoterphenyl <br /> 4261302 92 <br /> 4261103 96 <br /> 4261104 95 • <br /> 4261105 83 <br /> 4261106 87 <br /> 4261107 75 <br /> 4261108 86 <br /> 4261109 124 <br /> 4261110 89 <br /> 4261111 78 <br /> =-.-4263112 93 <br /> Blank 91 <br /> LCS 112 <br /> LCSD 111 <br /> Limits: 57-126 <br /> Analysis Name: TPH Fuels by GC (Waters) <br /> Batch number: 041170003A <br /> Chlorobenzene Orthoterphenyl <br /> 4261102 98 112 <br /> 4261103 139 108 <br /> 4261104 98 105 <br /> 4261105 109 93 <br /> 4261106 96 96 <br /> 4261107 81 83 <br /> 4261108 93 93 <br /> 4261109 663* 98 <br /> 4261110 122 98 <br /> 4261111 79 85 <br /> 4261112 94 101 <br /> Blank 87 102 <br /> LCS 102 120 <br /> LCSD 102 122 <br /> Limits: 13-154 45-138 <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 />