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#M Lancaster Laboratories Analysis Report � 2425 New Holland Pike PO Box 12425 tancasler PA 176052425 717 656 2.300 Fax 717 656-2681 www lancesterlabs com Page 2 of 4 Quality Control Summary Client Name ChevronTexaco Group Number 927693 Reported 01/20/45 at 05 15 PM Sample Matrix Quality Control MS MSD MS/MSD APD EKG DUP DUP Dup RPD Analysis Name %RBC %REC Limits RPD MAX Conc Conc RPD Max Batch number 05012AOBA Sample numbers) 4443810 + TPH-GRO - Waters 118 63-154 Batch number 05012AOBB Sample number(s) 4443806-4443809,4443811-4443816 TPH-GRO - Waters 1118 63-154 Batch number N050191AA Sample number(s) 4443807-4443810,4443812 Ethanol 118 120 33-153 2 30 Methyl Tertiary Butyl Ether 106 ill 69-134 4 30 di-Isopropyl ether 94 99 75-130 5 30 Ethyl t-butyl ether 101 104 76-119 3 30 t-Amyl methyl ether 100 104 77-117 4 30 t-Butyl alcohol 119 127 51-147 7 30 Benzene 99 102 63-126 3 30 Toluene 96 96 63-127 2 30 Ethylbenzene 98 102 62-129 4 30 Xylene (Total) 99 102 82-130 3 30 Batch number N050191AB Sample number(s) 4443811,4443813-4443816 Ethanol 116 120 33-153 2 30 Methyl Tertiary Butyl Ether 106 111 69-134 4 30 . ds-Isopropyl ether 94 99 75-130 5 30 Ethyl t-butyl ether 101 104 78-119 3 30 t-Amyl methyl ether 200 104 77-117 4 30 t-Butyl alcohol 119 127 51-147 7 30 Benzene 99 102 83-128 3 30 Toluene 96 98 83-127 2 30 Ethylbenzene 98 102 82-129 4 30 Xylene (Total) 99 102 82-130 3 30 Batch number Z050122AA Sample number(s) 4443806 Methyl Tertiary Butyl Ether 96 97 69-134 0 30 Benzene 111 113 83-128 1 30 Toluene ill 112 83-127 0 30 Ethylbenzene 110 112 62-129 2 30 Xylene (Total) 108 liq 82-130 2 30 Surrogate Quality Control Analysis Name TPH-GRO - Waters Batch number 05012AOBA Trifluorotoluene-P 4443810 90 Blank 68 LCS 91 LCSD 90 MS 90 Limits 57-146 Analysis Name TPH-GRO - Waters *-Outside of specification (1) 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 •