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i Q UAL [ T Y C O N T R O L R E S U L T S Job Number 992708 Report Date 01/06/2000 CUSTOMER IT Group PROJECT Southland - Martinez ATTN Rhonda Teicheira QC Type Description Reag Code Lab ID Dilution Factor Date Time MSD Matrix Spike Duplicate 09111501 992709-4 01/04/2000 2010 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F �enzene 49 80 49 11 50 0 00 99 6 39-150 1 20 Ethylbenzene 43 46 47 42 50 0 00 86 9 32-160 9 20 ethyl-t-Butyl Ether (MTBE) 401 24 280 42 250 3 75 159 0 50-150 X 135 25 Y Toluene 49 67 47 31 50 0 00 99 3 46-148 5 20 yLenes (total) 154 68 151 79 150 0 00 103 1 2D75-125 Test Method EPA 8260B Batch 10411 Analyst gfb Method Description Volatile Organics by GC/MS Units ug/L Matrix Spike 09120705 992648-1 12/27/1999 0730 Parameter/Test Description QC Result QC Result True Value Orig Value Catc Result * Limits F tert-Butyl Alcohol (TBA) 1233 46 1000 000000 178 95 105 5 48-194 Di-Isopropyl Ether 57 90 50 000000 0 115 8 53-149 I EthyL tert-Butyl Ether (ETBE) 55 97 50 000000 0 111 9 53-148 tert-Amyl Methyl Ether 57 01 50 000000 0 114 0 49-158 Methyl t-Butyl Ether (MTBE) 120 92 100 000000 11 55 109 4 44-190 ,1 1) 10 64 10 000000 0 106 4 70-130 �1,2 Dibromoethane (EDB) 11 95 10 000000 0 119 5 70-130 MSD Matrix Spike Duplicate 09120705 992648-1 12/27%1999 0803 Parameter/Test Description QC Result QC Result True Value Drig Value Catc Result * Limits F tert-Butyl Alcohol (TBA) 1306 00 1233 46 1000 000000 178 95 112 7 48-194 6 21 IDI-Isopropyl. Ether 58 24 57 90 50 000000 0 116 5 53-149 1 15 Ethyl tert-Butyl Ether (ETBE) 54 85 55 97 50 000000 0 109 7 53-148 2 28 tethyi-t-ButyL ert-Amyl Methyl Ether 54 54 57 01 50 000000 0 109 1 49-158 4 48 Ether (MTBE) 121 52 120 92 100 000000 11 55 110 044-190 0 21 fl-DichLoroethane 10 27 10 64 10 000000 0 102 7 70-130 4 30 2-Dibromoethane (EDB) 11 27 11 95 10 000000 0 1126 7 3070-130 I I I II I I f i I' I Page 6 *, %=% REC, R=RPD, A=ABS Diff D=% Diff I I I tl