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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 Job Number.: 992525 Report Date.: 12/14/1999 CUSTOMER: IT Group PROJECT_ Southland - Martinez ATTN: Rhonda Teicheira QC Type Description Reag. Code Lab 1D Dilution Factor Date Time LCS Laboratory Control Sample 09111502 12/03/1999 1819 Parameter/Test Description QC Result QC Result True Value Orig. Value Cate. Result * Limits F Benzene 51.84 50 103.7 39-150 Ethylbenzene 50.70 50 101-4 32-160 Methyl-t-Butyl Ether (MTBE) 245.88 250 98.4 50-150 Toluene 52.82 50 105.6 46-148 ' Xylenes (total) 159.15 150 106.1 75-125 LCD Laboratory Control Sample Duplicate 09111502 12/03/1999 1846 Parameter/Test Description QC Result QC Result True Value Orig- Value Calc. Result Limits F Benzene 50.85 51.84 50 101.7 39-150 1.9 20 Ethylbenzene 49.66 50.70 50 99.3 32-160 2.1 20 MethyL-t-Butyl Ether (MTBE) 7.39.10 245.88 250 95.6 50-150 2.8 25 V&uene 51-88 52.82 50 103.8 46-148 1-8 20 Xylenes (total) 156-36 159.15 150 104.2 75-125 1.8 20 MS Matrix Spike 09102802A 992530-1 12/04/1999 0636 Parameter/Test Description QC Result QC Result True Value Orfg. Value Calc. Result * Limits F Benzene 51.20 50 0.46 101.5 39-150 v Ethylbenzene 50.89 50 0-00 101.8 32-160 Methyl-t-Butyl Ether (MTBE) 228.20 250 0.00 91.3 50-150 Toluene 50.21 50 0.21 100.0 46-148 Xylenes (total) 157.93 150 0-16 105.2 75-125 MSD Matrix Spike Duplicate -- 09102802A 992530-1 12/04/1999 0702 Parameter/Test Description QC Result QC Result True Value Orig. Value Calc. Result ' Limits F Benzene 50.93 51.20 50 0.46 100.9 39-150 ' 1 20 Ethylbenzene 50.43 50.89 50 0.00 100.9 32-160 1 20 Methyl-t-Butyl Ether (MTBE) 234.46 228.20 250 C.00 93.8 50-150 3 25 Tuluene 50.02 50.21 50 0-21 99.6 46-148 0 20 Xylenes (total) 156.73 157.93 150 0.16 104-4 75-125 1 70 Page 9 * %-% RFC, R=RPD, A=ABS Diff., D-% 0iff.