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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 992524 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 /> Test Method EPA 80218 Batch - 9959 Analyst evd <br /> Method Description . Volatile Organics -Aromatics Units ug/L <br /> MS Method Blank 12103/1999 1244 <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 /> ihiesEther (MTBE) 0 00 <br /> ne 0 00 <br /> es (total) 0.00 <br /> LCS Laboratory Control Sample 09111502 12/03/1999 1401 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 53 42 50 106 8 39-150 <br /> Ethylbenzene 52 69 50 105 4 32-160 <br /> MethyL-t-Butyl Ether (MTBE) 290 36 250 116 1 50-150 <br /> Toluene 53 12 50 106 2 46-148 <br /> Xylenes (total) 162 39 150 108 3 75-125 <br /> ILCD Laboratory Control Sample Duplicate 09111502 12/03/1999 1427 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 52 64 53 42 50 105 3 39-150 <br /> 1 5 20 <br /> Ethylbenzene 51 37 52 69 50 102 7 32-160 <br /> 2 5 20 <br /> Methyl-t-Butyl Ether (MTBE) 282 94 290 36 250 113 2 50-150 <br /> 2 6 25 <br /> Toluene 51 87 53 12 50 103 7 46-148 <br /> 2.4 20 <br /> Xylenes (total) 158 38 162 39 150 105 6 75-125 <br /> 2 5 20 <br /> 1 Page 8 * %=% REC, R=RPD, A=ABS Diff , D=% Diff <br />