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I <br /> 0 U A L 1 T Y C 0 N T R 0 L R E S U L T S <br /> Job Number 200279 Report Date : 02/18/2000 <br /> CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Teicheira <br />' QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> MSD Mat11x Spike Duplicate 09111501 200278-4 02/08/2000 2156 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br />' Toluene 49 09 53.12 50 0 97 96 2 46-148 <br /> 8 20 <br /> xylenes (total) 160 62 166 75 150 0 70 106 6 75-125 <br />' 4 20 <br /> Test Method EPA 80218 Batch - 10999 Analyst .: evd <br />' Method Description Volatile Organics -Aromatics Units ug/L <br /> MB Method Blank 02/09/2000 1042 <br /> Parameter/Test Description OC Result OC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 0 00 <br /> Ethylbenzene 0 00 <br /> I Methyl-t-Butyl Ether (MTBE) 0 00 <br /> ene 0 00 <br /> nes (total) 0.00 <br /> LCS Laboratory Control Sample 09111502 02/09/2000 1246 <br /> Parameter/Test Description 0C Result QC Result True Value Orig Value Calc Resutt Limns F <br /> Benzene 48 64 50 97.3 _ 39-150 <br /> Ethylbenzene 46 94 50 93 9 32-160 <br /> Methyl-t-Butyl Ether (MTBE) 282 63 250 113 1 50-150 <br /> ToLuene 47 67 50 95 3 46-148 <br /> Xylenes (total) 142 95 150 95 3 75-125 <br /> LCD Laboratory Control Sample Duplicate 09111502 02/09/2000 1312 <br /> Parameter/Test Description OC Result OC Result True Value Orig Value Calc Result • Limits F <br /> Benzene 48 78 48 64 50 97 6 39-150 <br /> 0 3 20 <br /> EthyLbenzene 46 94 46 94 50 93 9 32-160 <br /> 0 0 20 <br /> Methyl-t-Butyl Ether (MTBE) 268 90 282 63 250 107 6 50-150 <br /> 5.0 25 <br /> Toluene 47 74 47 67 50 95.5 46-148 <br /> 0.1 20 <br /> Xylenes (total) 143 17 142 95 150 95 4 75-125 <br /> 0 2 20 <br /> I <br /> I <br /> Page 11 * %=% REC, R=RPD, A=ABS Diff , D=% Diff <br />