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Lancaster Laboratories <br />i Where quality is a science. <br />Quality Control Summary <br />Client Name: ChevronTexaco Group Number: 824199 <br />Reported: 10/02/02 at 10:49 AM <br />Sample Matrix Quality Control <br />MS MSD MS/MSD RPD BKG DUP <br />Analvaia Name <br />%RSC <br />%REC <br />iT. mit@ <br />RPD <br />MAX Conc <br />Batch number: N022682AB <br />Sample <br />number(s): <br />3905795 <br />Blank <br />100 <br />Ethanol <br />74 <br />75 <br />34-163 <br />1 <br />30 <br />Methyl t -butyl ether <br />98 <br />96 <br />69-134 <br />1 <br />30 <br />di -Isopropyl ether <br />89 <br />88 <br />68-133 <br />1 <br />30 <br />Ethyl t -butyl ether <br />88 <br />87 <br />73-123 <br />1 <br />30 <br />t -Amyl methyl ether <br />93 <br />90 <br />69-118 <br />3 <br />30 <br />t -Butyl alcohol <br />87 <br />Bo <br />51-148 <br />4 <br />30 <br />Benzene <br />(2) <br />(2) <br />78-134 <br />2 <br />30 <br />1,2-Dichloroethane <br />98 <br />95 <br />73-136 <br />2 <br />30 <br />Toluene <br />107 <br />106 <br />83-127 <br />1 <br />30 <br />1,2-Dibromoethane <br />87 <br />84 <br />78-120 <br />3 <br />30 <br />Ethylbenzene <br />108 <br />106 <br />82-134 <br />2 <br />30 <br />Xylene (Total) <br />101 <br />100 <br />82-130 <br />2 <br />30 <br />Batch number: N022691AB <br />Sample <br />number(s): <br />3905796-3905799 <br />Ethanol <br />63 <br />67 <br />34-163 <br />6 <br />30 <br />Methyl t -butyl ether <br />95 <br />96 <br />69-134 <br />2 <br />30 <br />di -Isopropyl ether <br />96 <br />98 <br />68-133 <br />2 <br />30 <br />Ethyl t -butyl ether <br />96 <br />99 <br />73-123 <br />2 <br />30 <br />t -Amyl methyl ether <br />96 <br />97 <br />69-118 <br />1 <br />30 <br />Butyl alcohol <br />89 <br />90 <br />51-148 <br />1 <br />30 <br />nzene <br />101 <br />104 <br />78-134 <br />3 <br />30 <br />2-Dichloroethane <br />96 <br />97 <br />73-136 <br />1 <br />30 <br />oluene <br />102 <br />105 <br />83-127 <br />3 <br />30 <br />1,2-•Dibromoethane <br />96 <br />98 <br />78-120 <br />2 <br />30 <br />Ethylbenzene <br />103 <br />106 <br />82-134 <br />3 <br />30 <br />Xylene (Total) <br />105 <br />108 <br />82-130 <br />3 <br />30 <br />Batch number: N022701AA <br />Sample <br />number(s): <br />3905800 <br />Methyl t -butyl ether <br />97 <br />97 <br />69-134 <br />0 <br />30 <br />Benzene <br />106 <br />108 <br />78-134 <br />2 <br />30 <br />Toluene <br />107 <br />107 <br />83-127 <br />1 <br />30 <br />Ethylbenzene <br />108 <br />109 <br />82-134 <br />1 <br />30 <br />Xylene (Total) <br />111 <br />111 <br />82-130 <br />0 <br />30 <br />Surrogate Quality Control <br />Analysis Name: Methanol and Ethanol <br />Batch number: 022690013A <br />Acetone <br />Page 2 of 4 <br />DUP <br />Conc RPD <br />3905795 <br />100 <br />3905796 <br />99 <br />3905797 <br />103 <br />3905798 <br />99 <br />3905799 <br />102 <br />Blank <br />100 <br />LCS <br />95 <br />MS <br />98 <br />MSD <br />98 <br />*- Outside of specification <br />The result for one or both determinations was less than five times the LOQ. <br />The background result was more than four times the spike added. <br />Lancaster Laboratories, Inc. <br />M E M B E R 2425 New Holland Pike <br />PO Bax 12425 <br />Lancaster, 17605-2 <br />717•b56-230000Fax: 717-656-2681 <br />DUP <br />RPD <br />Max <br />2216 Rev. 9111100 <br />