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(0flLAB CORE LABORATORIES <br /> D U A L I T Y C 0 N T R 0 L R E S U L T S <br /> Job Number 981249 Date 08/31/98 <br /> CUSTOMER Fluor Daniel GTI PROJECT. STHL\#20632 ATTN. Greg Mason <br /> QC Type Description Reag Code Lab ID Dilution Factor TDate Time <br /> MS Matrix Spike 08060207 981253-1 1000 08f29/980141 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> ert-Butyl Atcohot (TBA) 388 96 500 000000 -24 60 82 7 % 75-125 <br /> Di-Isopropyl Ether 27 23 25 000000 -1 14 114 3 % 75-125 <br /> Ethyl tert-Butyl Ether (ETBE) 22 31 25.000000 -1 15 93 8 % 75-125 <br />�ert-Amyl Methyl Ether 21 57 25 000000 0 86 3 % 75-125 <br /> ethyl-t-Butyl Ether (MTBE) 45 41 -It UOUOOO -2 95 96 7 % 75-125 <br /> MSD Matrix Sptke Duplicate 08060207 981253-1 1000 08/29/98 0219 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> tert-Butyl Alcohol (TBA) 338 80 388 96 500 000000 -24 60 72 7 % 75-125 <br /> 14 R 20 <br /> 1i-Isopropyl Ether 24 74 27 23 25 000000 -1 34 104 3 % 75-125 <br /> 10 R 20 <br /> Ethyl tert-Butyl Ether (ETBE) 21 07 22 31 25 000000 -1 15 88 9 % 75-125 <br /> 6 R 20 <br /> t-Amyl Methyl Ether 19 43 21 57 25 000000 0 77 7 % 75-125 <br /> 10 R 20 <br /> F#thyt-t-ButyL Ether (MTBE) 40 53 45 41 50 000000 -2 95 87 0 % 75-125 <br /> 11 R 20 <br /> CCV Continuing Calibration Verification 08060207 1000 08/28/98 1547 <br /> Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits <br /> ert-Butyl Alcohol (TBA) 618 93 500 000000 124 % 80-120 <br /> Di-Isopropyl Ether 30 41 25 000000 122 % 80-120 <br /> Ethyl tert-Butyl Ether (ETBE) 28 42 25 000000 114 % 80-120 <br /> ert-Amyl Methyl Ether 27 54 25 000000 110 % 80-120 <br /> ethyl-t-Butyl Ether (MTBE) 54 03 50 000000 108 % 80-120 <br /> Page 7 <br /> * % % REC R-RPD A-ABS Diff D-% Diff <br />