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' Q UAL I T Y C O N T R O L R E S U L T S Job Number.: 200279 Report Date : 02/18/2000 ' CUSTOMER IT Group PROJECT.* Southland - Martinez ATTN. Rhonda Teicheira OC Type Description Reag Code Lab ID Dilution Factor Date Time LCS Laboratory Control Sample 09111502 02/08/2000 1619 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 47.13 50 94.3 39-150 Ethylbenzene 47.45 50 94.9 32-160 Methyl-t-Butyl Ether (MTBE) 236 40 250 94.6 50-150 Toluene 49.35 50 98.7 46-148 Xylenes (total) 152.31 150 101.5 75-125 LCD Laboratory Control Sample Duplicate 09111502 02/08/2000 1645 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 47.74 47 13 50 95 5 _ 39-150 20 Ethylbenzene 48 02 47 45 50 96 0 32-160 1 2 20 Methyl-t-Butyl Ether (MTBE) 225 05 236 40 250 90.0 50-150 4.9 25 ene 50 09 49 35 50 100 2 46-148 1 5 20 eves (total) 153.59 152.31 150 102 4 75-125 0 8 20 MB Method Bfank 02/08/2000 1711 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 0.00 Ethylbenzene 0.00 Methyl-t-Butyl Ether (MTBE) 0 00 Toluene 0 28 ' Xylenes (total) 0.08 M5 Matrix Spike 09111501 200278-4 02/08/2000 2130 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 86 95 50 38.67 96 6 39-150 Ethylbenzene 81 60 50 36.60 90.0 32-160 Methyl-t-Butyl Ether (MTBE) 268 61 250 51.14 87.0 50-150 Toluene 53.12 50 0 97 104 3 46-148 Xylenes (total) 166.75 150 0 70 110 7 75-125 MSD Matrix Spike Duplicate 09111501 200278-4 02/08/2000 2156 Parameter/Test Description QC Result QC Result True Value orig Value Calc Result } Limits F ' Benzene 84 37 86 95 50 38 67 91 4 39-150 3 20 lbenzene 78 97 81.60 50 36 60 84.7 32-160 3 20 OYL-t-ButyL Ether (MTBE) 264 47 268.61 250 51 14 85.3 50-150 2 25 Page 10 * %=% REC, R=RPD, A=ABS Diff , D=% Diff