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Job Number 200278 oUAL I TY CONT R 0 L RE SU L TS Report Date 02/18/2000 CUSTOMER IT Group PROJECT Southland - Martinez ATTN- Rhonda Teicheira OC Type Uscriptlon Reag Code Lab LD Dilution Factor Date Time Laboratory Control Sample 09111502 02/08/2000 113 LCS1 Parameter/Test Description OC Result OC Result True Value Orig Value Calc Result * Limits F enzene 49 28 50 98 6 39-150 thylbenzene 47 21 50 94 4 32-160 Methyl-t-Butyl Ether (MTBE) 273 69 250 109 5 50-150 oluene 48 19 50 96 4 46-148 �ylenes (total) 144 39 150 96.3 75-125 LCD::�: Laboratory Control Sample Duplicate 09111502 1 02/08/2000 1157 Parameter/Test Description OC Result OC Result True Value Orig Value Calc Result * Limits F Benzene 49 36 49 28 50 98 7 39-150 0 2 20 thylbenzene 47 42 47 21 50 940 8 20 2- 160 Methyl-t-Butyl Ether (MTBE) 269 18 273 69 250 107 7 50-150 1 7 25 �e 48 19 48 19 50 96 4 46-148 D 0 20 Xylenes (total) 144 78 144 39 150 96 3 2075-125 i M5 Matrix Spike 09111501 200279-5 02/08/2000 2327 Parameter/Test Description OC Result OC Result True Value Orig Value Calc Result * Limits F enzene 56 71 50 3 87 105 7 39-150 Ethylbenzene 51 66 50 2 59 98.1 32-160 Methyl-t-Butyl Ether (MTBE) 374 76 250 0 00 149 9 50-150 oluene 56 19 50 6 47 99 4 46-148 ylenes (total) 163 04 150 9 47 102 4 75-125 MSD Matrix Spike Duplicate 09111501 200279-5 02/08/2000 2352 Parameter/Test Description OC Result OC Result True Value Orig Value Calc Result * Limits F Benzene 56 28 56 71 50 3.87 10; 8 2039-150 thylbenzene 50 24 51 66 50 2 59 93 3 2432-160 Methyl-t-Butyl Ether (MTBE) 342 93 374 76 250 0 00 137 2 50-150 9 25 oluene 55 03 56 19 50 6 47 97.1 46-148 2 20 Xylenes (total) 158 71 163 04 150 9 47 99.5 2075-125 i Page 7 * %_% REC, R=RPD, A=ABS Diff D=% Ditf r.