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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 6 <br /> rQuality Control Summary <br /> Client Name: ChevronTexaco Group Number: 925298 <br /> ' Reported: 01/03/05 at 07:38 PM <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BRG DIIP DIIP Dup RPD <br /> ' Analysis Name %REC %REC Limits RPD MAX Conc Conc RPD Max <br /> t-Amyl methyl ether 84 89 58-126 6 30 <br /> t-Butyl alcohol 86 88 46-148 3 30 <br /> Benzene 90 90 58-126 0 30 <br /> 1,2-Dichloroethane 91 95 62-130 5 30 <br /> Toluene 91 88 55-125 3 30 <br /> 1,2-Dibromoethane 79 85 62-116 7 30 <br /> Ethylbenzene 88 87 50-127 1 30 <br /> Xylene (Total) 85 84 54-123 0 30 <br /> Batch number: A043522AB Sample number(s) : 4431235-4431237 <br /> Methyl Tertiary Butyl Ether 89 91 49-140 2 30 <br /> di-Isopropyl ether 105 103 55-132 2 30 <br /> Ethyl t-butyl ether 93 94 65-123 1 30 <br /> t-Amyl methyl ether 87 89 58-126 2 30 <br /> t-Butyl alcohol 91 93 46-148 2 30 <br /> ' Benzene 101 93 58-126 8 30 <br /> 1,2-Dichloroethane 99 97 62-130 2 30 <br /> Toluene 88 67 55-125 18 30 <br /> 1,2-Dibromoethane 85 86 62-116 1 30 <br /> Ethylbenzene 102 92 50-127 10 30 <br /> Xylene (Total) 95 83 54-123 11 30 <br /> Batch number: A043551AA Sample number(s) : 4431242-4431251 <br /> Methyl Tertiary Butyl Ether 92 86 49-140 7 30 <br /> di-Isopropyl ether 105 108 55-132 1 30 <br /> Ethyl t-butyl ether 96 96 65-123 0 30 <br /> t-Amyl methyl ether 90 89 58-126 2 30 <br /> t-Butyl alcohol 96 95 46-148 2 30 <br /> Benzene 97 102 58-126 4 30 <br /> 1,2-Dichloroethane 108 107 62-130 1 30 <br /> Toluene 94 99 55-125 4 30 <br /> 1,2-Dibromoethane 88 84 62-116 5 30 <br /> Ethylbenzene 98 103 50-127 5 30 <br /> Xylene (Total) 94 100 54-123 5 30 <br /> Batch number: Q043561AA Sample number(s) : 4431234 <br /> Ethylbenzene 106 115 50-127 8 30 <br /> Surrogate Quality Control <br /> Analysis Name: TPH - DRO CA LUFT (Soils) <br /> Batch number: 043520020A <br /> Orthoterphenyl <br /> 4431234 0* <br /> 4431235 63 <br /> 4431236 77 <br /> 4431237 85 <br /> 4431238 74 <br /> 4431239 69 <br /> 4431240 88 <br /> 4431241 76 <br /> 1 *-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 />