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2425 Now <br />Quality Control Summary <br />Client Name: ChevronTexaco <br />Reported: 11/04/05 at 10:23 AM <br />[- <br />Analysis Name <br />r <br />t -Butyl alcohol <br />11 <br />Benzene <br />4631656 <br />1,2-Dichloroethane <br />4631657 <br />Toluene <br />4631658 <br />1,2-Dibromoethane <br />4631659 <br />Ethylbenzene <br />4631660 <br />Xylene (Total) <br />4631661 <br />Batch number: Z053041AA <br />4631662 <br />Ethanol <br />4631663 <br />Methyl Tertiary Butyl Ether <br />di -Isopropyl ether <br />Ethyl t -butyl ether <br />t -Amyl methyl ether <br />t -Butyl alcohol <br />Benzene <br />1,2-Dichloroethane <br />Toluene <br />' <br />1,2-Dibromoethane <br />Ethylbenzene <br />i { <br />Xylene (Total) <br />Batch number: Z053043AA <br />Ethanol <br />Methyl Tertiary Butyl Ether <br />di -Isopropyl ether <br />Ethyl t -butyl ether <br />t -Amyl methyl ether <br />:E. <br />t -Butyl alcohol <br />Benzene <br />1,2-Dichloroethane <br />r- <br />Toluene <br />1,2-Dibromoethane <br />Ethylbenzene <br />Xylene (Total) <br />Group Number; 964517 <br />Sample Matrix Quality Control <br />MS MSD MS/MSD RPD B&O DDP <br />%REC IREC Limits RPD W Conc Conc <br />100 97 56-134 3 30 <br />101 98 83-128 2 30 <br />104 103 70-143 1 30 <br />101 99 83-127 2 30 <br />93 92 78-120 1 30 <br />100 99 82-129 2 30 <br />100 98 82-130 2 30 <br />Sample number(s): 4631658-4631676 <br />84 26-162 <br />109 69-134 <br />91 75-130 <br />98 78-119 <br />98 72-125 <br />98 56-134 <br />97 83-128 <br />113 70-143 <br />99 83-127 <br />93 78-120 <br />101 82-129 <br />100 82-130 <br />Sample number(s); 4631677-4631679 <br />73 77 26-162 6 30 <br />105 108 69-134 1 30 <br />92 93 75-130 1 30 <br />98 98 78-119 0 30 <br />103 100 72-125 2 30 <br />95 95 56-134 0 30 <br />97 98 83-128 1 30 <br />114 115 70-143 1 30 <br />98 99 83-127 1 30 <br />93 94 78-120 1 30 <br />103 103 82-129 0 30 <br />101 101 82-130 0 30 <br />Surrogate Quality Control <br />Analysis Name: Methanol and Ethanol <br />Batch number: 052990030A <br />,s :epori <br />Page 3 of 6 <br />DUP Dup RPD <br />RPD KAX <br />*- Outside of specification <br />F (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 />Acetone <br />4631654 <br />109 <br />4631655 <br />106 <br />4631656 <br />107 <br />4631657 <br />105 <br />4631658 <br />102 <br />4631659 <br />101 <br />4631660 <br />103 <br />4631661 <br />104 <br />4631662 <br />103 <br />4631663 <br />108 <br />*- Outside of specification <br />F (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 />