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Lancaster <br /> Laboratories Analysis Report <br /> 2425 New Holland Pike,PO Bar 12425,Lancaster,PA 176052425•717-6562300 Por:717-656-2681•www.lamasterlabS cm <br /> Page 2 of 4 <br /> Quality Control Summary ' <br /> Client Name: Chevron Group Number: 1119122 t <br /> Reported: 11/20/08 at 01:19 PM <br /> Sample Matrix Quality Control <br /> Unspiked (UNSPK) = the sample used in conjunction with the matrix spike <br /> Background (EKG) . the sample used in conjunction with the duplicate ' <br /> MS NSD MS/MSD APD EKG DUP DUP Dup RPD <br /> Analysis Name Me iREC Limits RPD MAX Conc Conc RPD Nam <br /> Batch number: D083211AA Sample number(el : 5522774-5522776,5522758-5522789 UNSPK: P523127 <br /> Methyl Tertiary Butyl Ether 103 103 69-127 0 30 <br /> Benzene 102 100 83-128 2 30 ' <br /> Toluene 106 108 83-127 2 30 <br /> Ethylbenzene 104 105 82-129 1 30 <br /> Xylene (Total) 107 109 82-130 2 30 <br /> Batch number: DOB3222AA Sample number(s): 5522786-5522787 UNSPK: P522810 ' <br /> Methyl Tertiary Butyl Ether 101 99 69-127 2 30 <br /> t-Amyl methyl ether 101 103 72-125 2 30 <br /> t-Butyl alcohol 82 82 70-121 1 30 <br /> Batch number: Z083211AA Sample number(s) : 5522777-5522785 UNSPK: 5522777 <br /> Methyl Tertiary Butyl Ether 106 113 69-127 6 30 ' <br /> t-Amyl methyl ether 97 101 72-125 5 30 <br /> t-Butyl alcohol 104 111 70-121 6 30 <br /> Benzene 104 111 83-128 6 30 <br /> Toluene 112 120 83-127 6 30 <br /> Ethylbenzene 112 118 82-129 6 30 <br /> Xylene (Total) 113 119 82-130 6 30 ' <br /> Surrogate Quality Control t <br /> Surrogate recoveries which are outside of the QC window are confirmed <br /> unless attributed to dilution or otherwise noted on the Analysis Report. <br /> Analysis Name: DRO (C10-C28) <br /> Batch number: 083150005A ' <br /> Orthoterphenyl <br /> 5522775 73 <br /> 5522776 BO <br /> 5522777 81 <br /> 5522779 95 ' <br /> 5522779 93 <br /> 5522780 95 <br /> 5522781 84 <br /> 5522782 76 <br /> 5522783 86 <br /> 5522784 80 ' <br /> 5522785 89 <br /> 5522786 84 <br /> 5522787 87 <br /> 55227BB 63 <br /> 5522789 87 ' <br /> Blank 78 <br /> LCs 87 <br /> LCSD 86 <br /> Limits: 59-131 <br /> '-Outside of specification <br /> (1)The result for one or both determinations was less than five times the LOQ. <br /> (2)The unspiked result was more than four times the spike added. ' <br />