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Lancaster <br /> a Laboratories REPRINT <br /> Page 2 of 4 <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number 839936 <br /> Reported 03/07/03 at 03 11 PM <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BAG DUP DUP Dup <br /> RPD <br /> Analysis_ Name %REC $REC Limits RPD MAX Conc Cone RPD Max <br /> Batch number 03034A07C sample number(s) 3988079 <br /> TPH-GRO - Waters 106 110 70-130 3 30 <br /> Batch number 03035A07A Sample number(s) 3988080-3988086 <br /> TPH-GRO - Waters 109 70-130 <br /> Batch number 030360010A sample number(s) 3988083-3988086 <br /> Methanol (by Direct Infection) 92 92 69-127 0 20 <br /> Batch number N030342AB Sample number(s) 3988078 <br /> Methyl Tertiary Butyl Ether 105 104 69-134 0 30 <br /> Benzene 114 114 83-128 1 30 <br /> Toluene 115 114 63-127 1 30 <br /> Ethylbenzene 115 113 82-134 2 30 <br /> Xylene (Total) 117 115 82-130 2 30 <br /> 10tch number N030351AA Sample number(s) 3968079-3988086 <br /> hanol 134 124 34-163 8 30 <br /> Methyl Tertiary Butyl Ether 104 104 69-134 0 30 <br /> di-Isopropyl ether 121 121 75-130 0 30 <br /> Ethyl t-butyl ether 92 94 73-123 2 30 <br /> t-Amyl methyl ether 93 94 77-117 1 30 <br /> t-Butyl alcohol 112 114 39-155 2 30 <br /> Benzene 117 116 83-128 0 30 <br /> 1,2-Dichloroethane 112 110 73-136 2 30 <br /> Toluene 115 115 83-127 1 30 <br /> 1,2-Dibromoethane 105 106 76-120 1 30 <br /> Ethylbenzene 115 114 82-134 0 30 <br /> Xylene (Total) 117 117 82-130 0 30 <br /> Surrogate Quality Control <br /> Analysis Name TPH - DRO CA LUFT (Waters) <br /> Batch number 030340017A <br /> Orthoterphenyl <br /> 3988079 104 <br /> 3988080 97 <br /> 3988081 97 <br /> 3988082 105 <br /> 3988083 98 <br /> 3988064 99 <br /> 3988085 102 <br /> 3988086 97 <br /> Outside of specification <br /> } 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 /> Lancaster laboratories tnc <br /> M E M B E R 2425 New Holland Pike <br /> PO Box 12425 <br /> Lancaster,PA 17605-2425 <br /> 717 656-73nn Fax 717 656 2681 <br />