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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 200208 Report Date 02/05/2000 CUSTOMER 17 Group PROJECT Southland - Martinez ATTN Rhonda Teicheira QC Type Description Reag Code Lab ID Dilution Factor Date Time LCS Laboratory Control Sample 09111502 01/28/2000 1211 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F enzene 51 77 50 103 5 39-150 thylbenzene _ 50 47 50 100 9 32-160 50-150 Methyl-t-Butyl Ether (MTBE) 305 19 250 122 1 Toluene 51.39 50 102 8 46-148 Fenes (total) 154.27 150 102 8 75-125 H LCD Laboratory Control Sample Duplicate 09111502 01/28/2000 1236 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 52 13 51 77 50 104.3 39-150 0.7 20 thylbenzene 51 45 50 47 50 102.9 32-160 IE 1 9 20 Methyl-t-Butyl Ether (MTBE) 307 50 305.19 250 123 0 50-150 0 8 25 10ne 52 01 51 39 54 104 0 46-148 1.2 20 xylenes (total) 157.23 154 27 150 104.8 75-125 1 9 20 MS Matrix Splice 09111501 200206-5 01/29/2000 0219 Parameter/Test Description OC Result QC Result True Value Orig Value Calc. Result * Limits F Benzene 47 69 50 0 00 95.4 __39-150 (thylbenzene 46 88 50 0 00 93 8 32-160 Methyl-t-Butyl Ether (MTBE) 240 87 250 0 00 96 3 50-150 Toluene 47 59 50 0 00 95.2 46-148 Xylenes (total) 143 04 150 0 00 95 4 75-125 MSD , Matrix Spike Duplicate T 09111501 200206-5 01/29/2000 + 0245 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 47 00 47 69 50 0 00 94 0 39-150 1 20 Ethylbenzene 46 00 46 88 50 0 00 92 0 32-160 2 20 MethyL-t-Butyl Ether (MTBE) 251 28 240 87 250 0 00 100 5 50-150 4 25 Toluene 46.62 47 59 50 0 00 93 2 46-148 2 20 Xylenes (total) 140 46 143 04 150 0 00 93 6 75-125 2 20 k page`6 *i 7=X REC, R=RPD, A=ABS IDif,f D=% Diff „ r