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(OULAB CORE LABORATORIES 0 U A L I T Y C 0 N T R 0 L R E S U L T S Job Number 990931 Report Date 05/31/1999 CUSTOMER IT Group PROJECT Southland - Martinez ATTN Bob Butler OC Type Description Rea g Code Lab ID Dilution Factor Date Time LCS Laboratory Control Sample 09043002 05/26/1999 1329 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits ienzene 49 31 50 98 6 _ 39-150 thyLbenzene 47 34 50 94 7 32-160 Methyl-t-Butyl Ether (MTBE) 252 00 250 100 8 50-150 oluene 48 83 50 97 7 46-148 ylenes (total) 149 50 150 99 7 75-125 LCDLaboratory Contrat Sample Duplicate 09043002 05/26/1999 1354 Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits Benzene 52 74 49 31 50 105 5 39-150 6 7 20 thyLbenzene 50 26 47 34 50 100 5 32-160 6 0 20 Methyl-t-Butyl Ether (MTBE) 302 45 252 00 250 121 0 50-150 18 2 25 ne 52 30 48 83 50 104 6 46-148 DV6 9 20 yLenes (total) 158 69 149 5u 150 105 8 75-125 6 0 20 MS Matrix Spike 09043001 990931-2 05/27/1999 0136 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits enzene 49 90 50 0 00 99 8 39-150 thylbenzene 50 71 50 3 41 94 6 32-160 Methyl-t-Butyl Ether (MTBE) 236 24 250 0 00 94 5 50-150 foluene 51.26 50 1 08 100 4 46-148 lenes (total) 160 60 150 10 54 100 0 75-125 MSD Matrix Spike Duplicate 09043001 990931-2 05/27/1999 0202 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits Benzene 47 91 49 90 50 0 00 95 8 39-150 4 20 It3hylbenzene 48 98 50 71 50 3 41 91 1 32-160 20 Methyl-t-Butyl Ether (MTBE) 233 64 236 24 250 0 00 93 5 50-159 1 25 tener. uene 48 91 51 26 50 1 08 95 7 46-148 5 20 (total) 155 53 160 60 150 10 54 96 7 75-125 3 20 ' Page 7 * %=% REC, R=RPD, A-ABS Diff 0=% Diff