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I 10 0 UAL I T Y C O N T R O L R ESU L T S Job Number 992524 Report Date 12/14/1999 CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Teicheira QC Type Description Reag Code Lab ID Dilution Factor Date Time MS Matrix Spike 09102f 992529-6 12/04/1999 0200 Parameter/Test Description QC Result QC Result True Value Orig Value Calc. Result * Limits F IBenzene 56 22 50 0.00 112 4 39-150 Ethylbenzene 51 84 50 0.00 103 7 32-160 Methyl-t-Butyl Ether (MTBE) 286 40 250 0 DO 114 6 50-150 Toluene 52 63 50 0 00 105 3 46-148 Xylenes (total) 156 97 150 0 40 104 4 75-125 MSD Matrix Spike Duplicate 09102802A 992529-6 12/04/1999 0226 Parameter/Test Description QC Result QC Result True Value Orig Value Calc. Result • Limits F Benzene 55 07 56 22 50 0 00 110 1 39-150 2 20 �EthyLbenzene 50 80 51 84 50 0 00 101 6 32-160 2 20 MethyL-t-Butyl Ether (MTBE) 282 99 286 40 250 0 00 113 2 50-150 1 25 ne 51 44 52 63 50 0 00 102 9 46-148 Ila2 20 Xylenes (total) 153 79 156 97 150 0 40 102 3 75-125 2 20 Test Method EPA 82608 Batch 10020 Analyst am Method Description Volatile Organics by GC/MS Units ug/L iLC5 Laboratory Control Samp€e 09112901 12/07/1999 1122 Parameter/Test Description QC Result QC Result True VaLue Orig Value Calc Result * Limits F tert-Butyl Alcohol (TBA) 1298 97 1000 000000 129 9 37-175 Di-Isopropyl Ether 40 76 50 000040 81 5 60-138 Ethyl tert-Butyl Ether (ETBE) 43 68 50 000000 87 4 51-143 tert-Amyl Methyl Ether 43 45 50 000000 86 9 64-137 Methyl-t-Butyl Ether (MTBE) 105 04 100 000000 105 0 33-169 1,2-Dichloroethane 10 72 10 000000 107 2 70-130 1,2-Dibromoethane (EDB) 8 83 10 000000 88 3 70-130 MB Method Blank 12/07/1999 1151 Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits F tert-Butyl Alcohol (TBA) 0 Di-Isopropyl Ether 0 Ethyl tert-Butyl Ether (ETBE) 0 tert-Amyl Methyl Ether 0 Methyl-t-Butyl Ether (MTBE) 0 10 1,2-Dichloroethane 0 Dibromoethane (EDB) 0 1 Page 9 * %_% REC, R=RPD, A=ABS Diff , D=% Diff