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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 200279 Report Date 02/18/2000 <br />' CUSTOMER IT Group PROJECT., Southland - Martinez ATTN Rhonda Telcheira <br /> QC Type F Description Reag. Code Lab ID Dilution Factor Date Time <br />' MSD Matrix Spike Duplicate 00012401 200240-2 02/01/2000 2041 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br />' 1,2-Dichloroethane 10 08 10 68 10 000000 0 100.8 70-130 <br /> 6 30 <br /> 1,2-Dibromoethane (EDB) 10 43 10 86 10 000000 0 104 3 70-130 <br />' 4 30 <br /> MS Matrix Spike 00012401 200262-21 T 02/04/2000 0914 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value CaIC Result * Limits F <br />' tert-Butyl Alcohol (TBA) 1158 23 1000 000000 0 115 8 48-194 <br /> Di-isopropyl Ether 62 39 50 000000 0.48 123 8 53-149 <br />' Ethyl tert-Butyl Ether (ETRE) 58 73 50 000000 0 117.5 53-148 <br /> tert-Amyl Methyl Ether 58 80 50 000000 0 117 6 49-158 <br /> Methyl-t-Butyl Ether (MTBE) 117 29 100 000000 5 02 112 3 44-190 <br /> 1,2-Dichloroethane 12 72 10 000000 0 127.2 70-130 <br /> 1,2-Dibromoethane (EDB) 12 28 10 000000 0 122.8 70-130 <br /> MSD Matrix Spike Duplicate 00012401 1 200262-21 02/04/2000 0945 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br />' tert-Butyl Alcohol (TBA) 1166 45 1158 23 1000 000000 0 116 6 48-194 <br /> 1 21 <br /> Di-Isopropyl Ether 64 26 62 39 50 000000 0 48 127 6 53-149 <br /> 3 15 <br /> Ethyl tert-Butyl Ether (ETRE) 59.99 58 73 5o 000000 0 120 0 53-148 <br /> 2 28 <br /> tert-Amyl Methyl Ether 59 71 58 80 50 000000 0 119.4 49-158 <br /> 2 48 <br /> Methyl-t-Butyl Ether (MTBE) 120 03 117 29 100 000000 5 02 115 0 44-190 <br /> 2 21 <br /> 1,2-Dichloroethane 12 29 12.72 10 000000 0 122 9 70-130 <br /> 3 30 <br />' 1,2-Dibromoethane (EDB) 12 05 12 28 10 000000 0 120 5 70-130 <br /> 2 30 <br />' LCS Laboratory Control Sample 00012401 02/09/2000 0201 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> tent-Butyl Alcohol (TBA) 1043 30 1000 000000 104.3 37-175 <br />' Di-Isopropyl Ether 50 18 50 000000 100 4 60-138 <br /> Ethyl tert-ButyL Ether (ETRE) 53 44 50 000000 106 9 51-143 <br /> tert-Amyl Methyl Ether 51.30 50 000000 102 6 64-137 <br /> MethyL-t-Butyl Ether (MTBE) 117 49 100 000000 117.5 33-169 <br />' 1,2-Dichloroethane 10 09 10 000000 100 9 70-130 <br /> 1,2-Dibromoethane (EDB) 10 26 10 000000 102 6 70-130 <br /> Page 13 " %=% REC, R=RPD, A=ABS Diff , D=% Diff <br />