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Q UAL I T Y C O N T R O L R E S U L T S <br /> Job Number 992528 Report Date 12/14/1999 <br /> CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Teicheira <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> MSD Matrix Spike Duplicate 09102802A 992552-1 12/09/1999 0903 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br />'Toluene 65 669 53 16 50 0 39 130 6 46-148 <br /> 21 20 Y <br /> Xylenes (total) 174 233 163 63 150 4 22 113 3 75-125 <br /> 6 20 <br /> 1 <br /> Test Method EPA 8021B Batch - 9955 Analyst evd <br /> Method Description - Volatile Organics -Aromatics Units ug/L <br /> MB Method Blank 12/03/1999 1700 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 0 00 <br /> Ethylbenzene 0 00 <br /> MWthes <br /> L-t-Butyl Ether (MTBE) 0 00 <br />� 0 00 <br /> (total) 0 00 <br /> LCS Laboratory ControL Sample 09111502 12/03/1999 1819 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 51 84 50 103.7 39-150 <br />' Ethylbenzene 50 70 50 101.4 32-160 <br /> Methyl-t-Butyl Ether (MTBE) 245 88 250 98 4 50-150 <br /> Toluene 52 82 50 105 6 46-148 <br /> Xylenes (total) 159 15 150 106 1 75-125 <br /> LCD Laboratory Control Sample Duplicate 09111502 12/03/1999 1846 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 50 85 51 84 50 101 7 39-150 <br /> 1 9 20 <br /> Ethylbenzene 49 66 50 70 50 99 3 32-160 <br /> 2 1 20 <br /> Methyl-t-Butyl Ether (MTBE) 239 10 245 88 250 95 6 50-150 <br /> 25 <br /> Toluene 51 88 52 82 50 103 8 46-148 <br /> 1 8 20 <br /> Xylenes (total) 156 36 159 15 150 104 2 75-125 <br /> 1 8 20 <br /> 1 <br /> • <br /> Page 12 * %=% REC, R=RPD, A=ABS Diff D=% Diff <br /> i <br />