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t Q U A L I T Y C D N T R O L R E S U L T S Job Number 200278 Report Date 02/18/2000 CUSTOMER IT Group PROJECT Southland - Martinez ATTN Rhonda Teicheira QC Type Ilescreption Reag Code Lab ID Dilution Factor Date Time MSD Matrix Spike Duplicate 09111501 200305-1 02/10/2000 2332 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F �enzene 349.96 368 47 50 308 20 83 5 39-150 5 20 Ethylbenzene 56 77 57 73 50 13 13 87 3 32-160 2 20 ethyl-t-Butyl Ether (MTBE) 8076 19 8280 25 250 8319 82 -97 5 50-150 X 2 25 Toluene 54 12 54 92 50 9 92 88 4 46-148 1 20 Xylenes (total) 149 71 151 09 150 15 60 89 4 75-125 a 1 20 CV Calibration Verification 09111501 1 02/11/2000 0206 Parameter/Test Description QC Result QC Result True Value Dreg Value Calc Result * Limits F 0ze1-t-ButyL ne 45 14 50 90 85-115 benzene 45 59 50 91 85-115 Ether (MTBE) 285 56 250 114 70-130 Toluene 45 63 50 91 85-115 Xylenes (total) 137 58 150 92 85-115 CV Calibration Verification 09111501 02/11/2000 0258 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 44 51 50 89 85-115 Ethylbenzene 45 00 50 90 85-115 Methyl-t-Butyl Ether (MTBE) 256 17 250 102 70-130 Toluene 44 87 50 90 85-115 Xylenes (total) 134 90 150 90 85-115 Test Method EPA 82606 Batch 11004 Analyst gfb Method Description Volatile Organics by GC/MS Units ug/L M5 Matrix Spike 00012401 200240-2 02/01/2000 2013 i Parameter/Test Description QC Result QC Result True Value Orig Value Calc. Result * Limits F tert-Butyl Alcohol (TBA) 1263 91 1000 000000 0 12b 4 34-182 Di-Isopropyl Ether 51 46 50 000000 0 102 9 60-131 Ethyl tert-Butyl Ether (ETBE) 51 15 50 000000 0 102 3 64-138 tert-Amyl Methyl Ether 52 20 50 000000 0 104 4 67-154 Methyl-t-Butyl Ether (MTBE) 119 26 100 000000 0 16 119 1 71-142 1,2-Dichloroethene 10 68 —10 000000 0 106 8 70-130 �1,2-Dibromoethane (EDB) 10 86 10 000000 0 108 6 70-130 Page 11 * X=X REC, R=RPD, A=ABS Diff D=Y. Diff.