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• 0 U A L I T Y C 0 N T R 0 L R E S U L T S Job Number 200279 Report Date.; 02/18/2000 ' CUSTOMER IT Group PROJECT: Southland - Martinez ATTN: Rhonda Teicheira QC Type Description Reag Code Lab ID Dilution Factor Date Time LCD Laboratory Control Sample Duplicate 09111502 02/08/2000 1157 Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits F ' Benzene 49 36 49 28 50 98.7 _ 39-150 0.2 20 Ethylbenzene 47.42 47 21 50 94.8 32-160 0.4 20 ' Methyl-t-Butyl Ether (MTBE) 269.18 273.69 250 107 7 50-150 1 7 25 Toluene 48 19 48.19 50 96 4 46-148 0 0 20 ' Xylenes (total) 144 78 144 39 150 96 5 75-125 0 3 20 Ms Matrix Spike 09111501 200279-5 T 02/08/2000 2327 Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 56 71 50 3 87 105.7 _ 39-150 EA&Lbenzene 51 66 50 2 59 98.1 32-160 RIWyl-t-Butyl Ether (MTBE) 374 76 250 0 00 149.9 50-150 Toluene 56 19 50 6.47 99 4 46-148 Xylenes (total) 163.04 150 9 47 102 4 75-125 1 MSD Matrix Spike Duplicate 09111501 200279-5 T 02/08/2400 2352 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 56 28 56 71 50 3.87 104.8 39-150 1 20 Ethylbenzene 50 24 51 66 50 2 59 95 3 32-160 3 20 Methyl-t-Butyl Ether (MTBE) 342 93 374.76 250 0 00 137.2 50-150 9 25 Toluene 55 03 56 19 50 6.47 97 1 46-148 2 20 ' Xylenes (total) 158 71 163 04 150 9 47 99.5 75-125 i 3 20 Test Method EPA 80216 Batch -- - 10983 Analyst evd Method Description Volatile Organics -Aromatics Units ug/L MS Method Blank 02/08/2000 1451 Parameter/Test Description QC Result OC Result True Value Orig Value Calc. Result * Limits F Benzene 0 00 Ethylbenzene 0 DO iMethyl-t-Butyl Ether (MTBE) 0 00 Toluene 0 24 nes (total) 0.00 Page 4 * X=X REC, R=RPO, A=ASS Diff D=X Diff r