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i <br />� `Lancaster <br />� Laboratories <br />Quality Control Summary <br />Client Name ChevronTexaco Group Number 844642 <br />Reported 03/19/03 at 09 59 PM <br />Batch number P030762AA <br />Ethanol <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 />2-Dichloroethane <br />uene <br />-Dibromoethane <br />Ethylbenzene <br />Xylene (Total) <br />1 <br />Sample number(s) 4010922-4010924 <br />96 <br />98 <br />34-163 <br />Sample Matrix <br />Quality Control <br />110 <br />114 <br />Ms <br />MSD <br />MS/MSD <br />76 <br />RPD BKG DUP DUP <br />75-130 <br />An�lysia Name <br />%REC <br />%REC <br />Limits <br />RSD � Conc Conc RPS <br />5 <br />Ethanol <br />55 <br />56 <br />34-163 <br />1 <br />30 <br />108 <br />Methyl Tertiary Butyl Ether <br />107 <br />106 <br />69-134 <br />1 <br />30 <br />1 <br />di -Isopropyl ether <br />77 <br />77 <br />75-130 <br />0 <br />30 <br />30 <br />Ethyl t -butyl ether <br />95 <br />95 <br />73-123 <br />1 <br />30 <br />99 <br />t -Amyl methyl ether <br />109 <br />109 <br />77-117 <br />0 <br />30 <br />6 <br />t -Butyl alcohol <br />65 <br />67 <br />39-155 <br />2 <br />30 <br />100 <br />100 <br />83-128 <br />0 <br />30 <br />'Benzene <br />1,2-Dichloroethane <br />118 <br />114 <br />73-136 <br />3 <br />30 <br />Toluene <br />110 <br />112 <br />83-127 <br />2 <br />30 <br />1,2-Dlbromoethane <br />87 <br />89 <br />78-120 <br />2 <br />30 <br />Ethylbenzene <br />116 <br />119 <br />82-134 <br />2 <br />30 <br />' <br />Xylene (Total) <br />105 <br />106 <br />82-130 <br />1 <br />30 <br />Batch number P030762AA <br />Ethanol <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 />2-Dichloroethane <br />uene <br />-Dibromoethane <br />Ethylbenzene <br />Xylene (Total) <br />1 <br />Sample number(s) 4010922-4010924 <br />96 <br />98 <br />34-163 <br />3 <br />30 <br />110 <br />114 <br />69-134 <br />4 <br />30 <br />76 <br />80 <br />75-130 <br />5 <br />30 <br />92 <br />97 <br />73-123 <br />5 <br />30 <br />108 <br />111 <br />77-117 <br />3 <br />30 <br />108 <br />115 <br />39-155 <br />6 <br />30 <br />98 <br />104 <br />83-128 <br />6 <br />30 <br />119 <br />126 <br />73-136 <br />6 <br />30 <br />104 <br />110 <br />83-127 <br />6 <br />30 <br />93 <br />99 <br />78-120 <br />6 <br />30 <br />109 <br />116 <br />82-134 <br />6 <br />30 <br />98 <br />104 <br />82-130 <br />6 <br />30 <br />Surrogate Quality Control <br />Analysis Name Methanol and Ethanol <br />Batch number 030730009A <br />Acetone <br />Page 2 of 3 <br />Analysis Name TPH-GRO - Waters <br />Batch number 03076A07B <br />Trifluorotoluene-F <br />4010921 92 <br />4010922 89 <br />4010923 94 <br />*- Outside of specification <br />(1) 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 $ox 1 <br />Lancaster, <br />PA PA 17605-2425 <br />717-656-2300 Fax 717-65&2681 <br />DUP <br />RPD <br />Max <br />2216 Rev 1012!02 <br />4010921 <br />4010922 <br />96 <br />98 <br />4010923 <br />97 <br />4010924 <br />100 <br />Blank <br />98 <br />96 <br />MS <br />94 <br />'14S <br />MSD <br />99 <br />Limits <br />72-128 <br />Analysis Name TPH-GRO - Waters <br />Batch number 03076A07B <br />Trifluorotoluene-F <br />4010921 92 <br />4010922 89 <br />4010923 94 <br />*- Outside of specification <br />(1) 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 $ox 1 <br />Lancaster, <br />PA PA 17605-2425 <br />717-656-2300 Fax 717-65&2681 <br />DUP <br />RPD <br />Max <br />2216 Rev 1012!02 <br />