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Lancaster <br /> Analysis nalys�s Report <br /> 2425 New Holland Pike,PO Box 12425,Lancaster,PA 17605-2425-717-656-2300 Fax:717-656-2681•www.lancasterlabs.com <br /> Page 2 of 3 <br /> Quality Control Summary <br /> Client Name: Che�rronTexaco Group Number: 982959 <br /> Reported: 04/03/06 at 05:14 PM <br /> Sample Matrix Quality Control <br /> Unspiked (UNSPK) = the sample used in conjunction with the matrix spike <br /> Background (BKG) = the sample used in conjunction with the duplicate <br /> MS MSD MS/MSD RPD BKG DUP DUP Dup RPD <br /> Analyeis Name %REC %REC Limits RPD MAX Conc Conc RPD Max <br /> Xylene (Total) 95 92 82-130 3 30 <br /> Surrogate Quality Control <br /> Surrogate recoveries which are outside of the QC window are confirmed <br /> unless attributed to dilution or otherwise noted on the Analysis Report. <br /> Analysis Name: TPH-GRO - Waters <br /> Batch number: 06087A20A <br /> Trifluorotoluene-F <br /> 4736035 86 <br /> 4736037 85 <br /> Blank 86 <br /> LCS 114 <br /> LCSD 113 <br /> MS 111 <br /> Limits: 63-135 <br /> Analysis Name: TPH-GRO - Waters <br /> Batch number: 06087B20A <br /> Trifluorotoluene-F <br /> 4736034 105 <br /> 4736036 98 <br /> Blank 100 <br /> LCS 118 <br /> LCSD 116 <br /> MS 119 <br /> Limits: 63-135 <br /> Analysis Name: BTEX+5 Oxygenates+EDC+EDS+ETOH <br /> Batch number: Z060921AA <br /> Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene <br /> 4736034 89 81 Be 86 <br /> 4736035 93 83 88 84 <br /> 4736036 88 82 86 89 <br /> 4736037 90 81 86 87 <br /> Blank 92 84 88 83 <br /> LCS 90 85 Be 89 <br /> MS 90 84 88 88 <br /> MSD 89 83 88 90 <br /> Limits: 80-116 77-113 80-113 78-113 <br /> *-Outside of specification <br /> (l) 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 />