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I <br /> 10 <br /> Q UAL I 7 Y C D N T R O L R E S U L T S <br /> Job Number 992528 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 /> Test Method EPA 82608 Batch 10020 Analyst am <br /> Method Description Volatile Organics by GC/MS Units ug/L <br /> LCS Laboratory Control Sample 09112901 12/07/1999 1122 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br />�tert-Butyl Alcohol (TBA) 1298 97 1000 000000 129 9 37-175 + <br /> Di-Isopropyl Ether 40 76 50 000000 81 5 60-138 <br /> Ethyl tert-ButyL Ether (ETRE) 43 68 50 000000 87 4 51-143 <br /> tert-Amyl Methyl Ether 43 45 50 000000 86 9 64-137 <br />�Methyl-t-Butyl Ether (MTBE) 105 04 100 000000 105 0 33-169 <br /> 1,2-DichLoroethane 10 72 10 000000 107 2 70-130 <br /> 1,2-Dibromoethane (EDB) 8 83 10 000000 88 3 70-130 <br /> MB Method Blank 12/07/1999 1151 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc. Result * Limits F <br /> 1#Butyl Alcohol (TBA) 0 <br /> opropyL Ether 0 <br /> EtyL tert-Butyl Ether (ETBE) 0 <br /> tert-Amyl Methyl Ether 0 <br />,Methyl-t-ButyL Ether (MTBE) 0 10 <br /> 1,2-DichLoroethane 0 <br /> 1,2-Dibromoethane (EDB) 0 <br /> MS Matrix Spike 09112901 992556-6 12/07/1999 1705 - <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc. Result * Limits F <br /> tert-Butyl Alcohol (TBA) 1317 66 1000 000000 0 131 8 _ 48-194 <br /> Di-Isopropyl Ether 38 89 50 000000 0 77 8 53-149 <br /> Ethyl tert-Butyl Ether (ETBE) 43 21 50 000000 0 86 4 53-148 <br /> tert-Amyl Methyl Ether 42 90 50 000000 0 85 8 49-158 <br /> Methyl-t-Butyl Ether (MTBE) 111 38 100 000000 0 43 111 0 44-190 <br />�1,2-DichLoroethane 11 04 10 000000 0 110 4 70-130 <br /> 1,2-Dibromoethane (EDB) 8 29 10 000000 0 82 9 70-130 <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 /> tert-Butyl Alcohol (TBA) 1036 41 1317 66 1000 000000 0 103.6 48-194 <br /> 24 21 Y <br /> Di-Isopropyl Ether 32 89 38 89 50 000000 0 65 8 53-149 <br /> 17 15 Y <br /> Ethyl tert-Butyl Ether (ETBE) 35 82 43 21 50 000000 0 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 /> L-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 /> Page 15 * %=% REC, R=RPD, A=ABS Diff., D=% Diff <br />