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Q U A L I T Y C 0 N T R 0 L R E S U L T S <br /> Job Number.: 992525 Report Date.: 12/14/1999 <br /> CUSTOMER: IT Group PROJECT: Southland - Martinez ATTN: Rhonda Teicheira <br /> QC Type Description Reag. Code Lab ID Dilution Factor Date Time <br /> MSD Matrix Spike Duplicate 09112901 992556-6 12/07/1999 1740 <br /> Parameter/Test Description QC Result QC Result True Value Orig. Value Calc. Result " Limits F <br /> i tert-Butyl Alcohol (TBA) 1036.41 1317.66 1000.000000 0103.6 48 194 <br /> 24 21 Y <br /> Di-Isopropyl Ether 32.89 38.89 50.000000 0 65.8 53-149 <br /> 15 Y <br /> 71 <br /> Ethyl tett-Butyl Ether (ETRE) 35.82 43.21 50.004000 D 71.6 53-148 <br /> 19 28 <br /> tert-Amyl Methyl Ether 36.71 42.90 50.000000 0 73.4 49-158 <br /> 16 48 <br /> Methyl-t-Butyl Ether (MTBE) 94.50 111.38 100,000000 0.43 94.1 44-190 <br /> 16 21 <br /> 1,2-Dichloroethane 9.97 11-04 10.000000 0 99-7 70-130 <br /> 10 30 <br /> 1,2-Dibromoethane (EDB) 6.17 8.29 10.000000 0 61.7 70-130 X <br /> 29 30 <br /> LCS Laboratory Controt Sample t 09112901 12/07/1999 2037 <br /> Parameter/Test Description OC Result QC Result True Value Orig. Value Calc. Result * Limits F <br /> tert-Butyl Alcohol (TBA) 1353.73 1000.000000 135.4 37-175 <br /> ' Di-Isopropyl Ether 33.07 50.000000 66-1 60-138 <br /> Ethyl tent-Butyl Ether (ETRE) 37.93 50.000000 75.9 51-343 <br /> tett-Amyl Methyl Ether 45.08 50.000000 90-2 64-137 <br /> Methyl-t-Butyl Ether (MTBE) 92.71 100.000000 92.7 33-169 <br /> 1,2-0ic1loroethane 11.09 10.000000 110.9 70-130 <br /> 1,2-Dibromoethane (E08) 8.29 10.000000 82.9 70-130 <br /> MB Method Blank 12/07/1999 2046 <br /> Parameter/Test Description OC Result QC Result True Value Ortg. Value Calc. Result * Limits F <br /> tert-Butyl Alcohol (TBA) 0 --- - _..- <br /> Di-Isopropyl ,her 0 <br /> Ethyl tent-Butyl Ether (ETBE) 0.04 <br /> tent-Amyl Methyl Ether 0 <br /> Methyl-t-Butyl Ether (MTBE) 0.21 <br /> 1,2-Dichtoroethane 0 <br /> 1,2-Dibromoethane (EDB) 0 <br /> MS Matrix Spike 09132901 992528-1 12/08/3999 0424 <br /> Parameter/Test Description OC Result OC Resutt True Value Orig. Value Calc- Result * Limits F <br /> tert-Butyl Alcohol (TBA) 1129.43 1000.000000 D 112.9 34-182 <br /> Di-Isopropyl Ether 46.66 50.000000 0 93.3 60-131 <br /> 1 Ethyltert-Butyl Ether (ETBE) 52.57 50.000000 0.04 105.1 64-138 <br /> tett-Amyl Methyl Ether 51.06 50.000000 0 102.1 67-154 <br /> thyt-t-Butyl Ether (MTBE) 133.00 100.000000 5.47 127.5 71-142 <br /> 2-0ichloroethane 12.95 10.000000 0.44 125.1 70-130 <br /> 2-Dibromoethane (E08) 8.2C 10.000000 0 82.0 70-130 <br /> Page 12 * %=% REC, R=RPD, A=ABS Diff., D-% Diff, <br />