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t I T Y C O N T R O L R E S U L T S Job Number 99252$ Q U A L Report Date. 12/14/1999 CUSTOMER IT Group PROJECT* Southland - Martinez ATTU Rhonda Telcheira QC Type Description Reag Code Lab ID Dilution Factor T Date Time LCS Laboratory Control Sample 09111502 12/08/1999 1118 Parameter/Test Description QC Result OC Result True Value Orig Value Calc Result * Limits F Benzene 53 44 50 106 9 39-150 Ethylbenzene 52 40 50 104 8 32-160 Methyl-t-Butyl Ether (MTBE) 295 03 250 118 0 50-150 Toluene 52 87 50 105 7 46-148 'Xylenes (total) 161 37 150 107 6 75-125 LCD Laboratory Control Sample Duplicate 09111502 12108/1999 1143 Parameter/Test Description QC Result OC Result True Value Orig Value Calc Result * Limits F Benzene 52 89 53 44 50 105 8 39-150 1 0 20 'Ethylbenzene 51 77 52 40 50 103 5 32-160 1 2 20 Methyl-t-Butyl Ether (MTBE) 312 80 295 03 250 125 1 50-150 5 8 25 ne 52 21 52 87 50 104 4 46-148 10 1 3 20 Xylenes (total) 159 73 161 37 150 106 5 75-125 1 0 20 rMB Method Blank 12/08/1999 1417 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 00 'Xylenes (total) 0 00 MS Matrix Spike 09102802A 992552-1 12/08/1999 1559 Parameter/Test Description QC Result QC Result True Value Orig Value CaLc Result * Limits F Benzene 82 39 50 30 48 103 8 39-150 Ethylbenzene 60 51 50 7 93 105 2 32-160 Methyl-t-Butyl Ether (MTBE) 283 53 250 0 00 113 4 50-150 Toluene 53 16 50 0 39 105 5 46-148 Xylenes (total) 163 63 150 4 22 106 3 75-125 ' MSD Matrix Spike Duplicate 09102802A 992552-1 12/09/1999 0903 Parameter/Test Description QC Result QC Result True Value Orig Value Catc Result * Limits F Benzene 79 864 82 39 50 30 48 98 8 _ 39-150 20 benzene 60 283 60 51 50 7 93 104 7 32-160 0 20 'Methyl-t-Butyl Ether (MTBE) 229 641 283 53 250 0 00 91 9 50-150 21 25 Page 11 * X=X REC, R=RPD, A=ABS Diff , D=% Diff