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Analysis Report Lancaster Laboratories Page 2 of 4 Quality Control Summary Client Name ChevronTexaco Group Number 837884 Reported 01/27/03 at 07 48 PM Sample Matrix Quality Control MS MSD MS/MSD RPD BKG DUP DVP DuP RPD Analysis Name $RSC %RBC Lxmuts RPD MAX Conc Conc RPD Max TPH-GRO - Waters 116 74-132 Batch number 030200000A Sample number(s) 3978290-3978296 Methanol (by Direct In3ection) Be 88 69-127 0 20 Batch number N030231AA Sample number(s) 3978289-3978291 Ethanol 62 67 34-163 8 30 Methyl Tertiary Butyl Ether 101 103 69-134 2 30 di-Isopropyl ether 91 92 68-133 1 30 Ethyl t-butyl ether 100 101 73-123 1 30 t-Amyl methyl ether 99 100 69-118 1 30 t-Butyl alcohol 82 82 51-148 0 30 Benzene 110 110 78-134 0 30 1,2-Dichloroethane 117 118 73-136 0 30 Toluene 106 108 83-127 2 30 1,2-Dibromoethane 96 98 78-120 2 30 Ethylbenzene 107 109 82-134 1 30 Xylene (Total) 108 109 82-130 1 30 0itch number N030241AS Sample number(s) 3978292-3978296 thanol 71 75 34-163 5 30 ethyl Tertiary Butyl Ether (2) (2) 69-134 1 30 di-Isopropyl ether 92 94 68-133 2 30 Ethyl t-butyl ether 101 103 73-123 2 30 t-Amyl methyl ether 104 108 69-118 2 30 t-Butyl alcohol 76 78 51-148 2 30 Benzene 114 114 78-134 0 30 1,2-Dichloroethane 124 124 73-136 0 30 Toluene ill 110 83-127 1 30 1,2-bibromoethane 96 99 78-120 3 30 Ethylbenzene 112 114 82-134 2 30 Xylene (Total) 113 115 82-130 2 30 Surrogate Quality Control Analysis Name TPH-GRO - Waters Batch number 03015A53A Trlfluorotoluene-F 3976289 109 3978290 108 3978291 109 3978292 116 Blank 113 LCS 109 LCSD 110 MS 109 Limits 57-146 Analysis Name TPH-GRO - Waters *-Outside of specification �l) The result for one or both determinations was less than five times the LOQ (2) The background result was more than four times the spike added Lancaster Laboratories Inc AR E M B R 2425 New Holland Pike PO Box 12425 Lancaster PA 17605 2425 717 BSfi 730n Fax 717 656-2681 773E Qo„ snnm')