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1 <br /> COULAB CORE LABORATORIES <br /> D U A L I T Y C O N T R O L R E S U L T S <br /> Job Number 990877 Report Date 05/31/1999 <br /> ' CUSTOMER 1T Group PROJECT- Southland - Martinez ATTN Shelby Lathrop <br /> QC Type Description Reag Code Lab 1D Dilution Factor Date Time <br /> ' MSD Matrix Spike Duplicate 09042404 990912-3 05/29/1999 0110 <br /> Parameter/Test Description qC Result OC Result True Value Orig Value Calc Result * Limits <br /> ' Benzene 10 79 10 86 10 000000 0 107 9 67-127 <br /> 1 11 <br /> Chlorobenzene 10 18 10 43 10 000000 0 101 8 68-128 <br /> 2 13 <br /> ' 1,1-Dichtoroethane 10 99 11 01 10 000000 0 109 9 66-126 <br /> 0 14 <br /> Toluene 10 93 10 82 10 000000 0 109 3 72-132 <br /> 1 13 <br /> Trichloroethene 10 65 11 07 10 000000 0 106 5 74-134 <br /> 4 14 <br /> Test Method EPA 8020A Batch V 6371 Analyst evd <br /> ' Method Description Volatile Organics Aromatics _ Units ug/L <br /> MB Method Blank � Z 05/21/1449 1123 <br /> Parameter/Test Description QC Result CC Result True Value nrig Value Calc Result * Limits <br /> %n;eri, 0 00 <br /> Ethylbcnzene 0 00 <br /> ' Methyl-t-Butyl Ether (MTBE) 0 00 <br /> Toluene 0 00 <br /> Xylenes (total) 0 00 <br /> LCS Laboratory Control Sample 09043002 05/21/1999 1241 <br /> Parameter/Test Description QC Result QC Result True Value Orig VaLue Calc Result * Limits <br /> ' Benzene 50 56 50 101 1 39-150 <br /> Ethylbenzene 48 26 50 96 5 32-160 <br /> Methyl t-Butyl Ether (MTBE) 306 56 250 122 6 50-150 <br /> Toluene 50 06 50 100 1 46-148 <br /> ' Xylenes (total) 152 19 150 101 5 75-125 <br /> LCD Laboratory Control Sample Duplicate 09043002 05/21/1999 2000 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> Benzene 48 36 50 56 50 96 7 39-150 <br /> 4 4 20 <br /> ' Ethylbenzene 46 07 48 26 50 92 1 32 160 <br /> 4 6 20 <br /> Methyl C Butyl Ethel (MTBE) 289 24 306 56 250 115 7 50 150 <br /> 5 8 25 <br /> ' <br /> Toluene 47 41 50 06 50 94 8 46 148 S 20 <br /> 3 <br /> Xylenes (total) 145 94 152 1� 150 97 3 75 125 <br /> 4 2 20 <br /> Page 42 <br /> * /_% REC, R=RPD, A=ABS Diff D=% Diff <br />