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Q UAL I T Y C O N T R O L R E 5 U L T 5 Job Number 992707 Report Date 01/06/2000 CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Teicheira OC Type Description Reag Code Lab ID Dilution Factor Date Time CV Calibration Verification 09111501 01/06/2000 0134 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F enzene 48 81 50 98 85-115 thylbenzene 47 78 50 96 85-115 Methyl-t-Butyl Ether (MTBE) 268 19 250 107 70-130 oluene 49 60 50 99 85-115 yLenes (total) 149 81 150 100 85-115 CV CalibrationVerification 09111501 01/06/2000 0227 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 49 49 50 99 85-115 thylbenzene 48 47 50 97 85-115 Iethyl-t-Butyl Ether (MTBE) 253 58 250 101 70-130 oLuene 49 86 50 100 85-115 Xylenes (total) 151 42 150 101 85-115 Laboratory Control Sample 09111502 01/06/2000 0605 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F ienzene 50 47 50 100 9 39-150 thytbenzene 48 82 50 97 6 32-160 Methyl-t-Butyl Ether (MTBE) 279 88 250 112 0 50-150 Toluene 51 43 50 102 9 46-148 ylenes (total) 154 69 150 103 1 75-125 LCD Laboratory Control Sample Duplicate 09111502 01/06/20002!301 Parameter/Test Description OC Result OC Result True Value Orig Value Calc Result * Limits F Benzene 50 17 50 47 50 100 3 39-150 0 6 20 thylbenzene 48 51 48 82 50 97 0 32-160 0 6 20 Methyl-t-Butyl Ether (MTBE) 252 78 279 88 250 101 1 50-15D 10 2 25 Ceres uene 51 41 51 43 50 102 8 46-148 0 0 20 (total) 153 14 154 69 150 102 1 75-125 1 0 20 MS Matrix Spike 09111501 992702-1 01/06/2000 1015 Parameter/Test Description QC Result OC Result True Value Orig Value Calc Result * Limits F Benzene 63 82 50 15 15 97 3 _ 39-150 ,F benzene 52 06 50 2 56 99 0 32-160 L-t-Butyl Ether (MTBE) 1161 26 250 1043 52 47 1 50-150 X ene 51 96 50 3 73 96 5 46-148 �XyLenes (total.) 166 68 150 11 83 103 2 75-125 Page 9 * %=% REC, R=RPD, A=ABS Diff , D=% Diff