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1 <br /> 16 OiELAB CORE LABORATORIES <br /> o U A L I T <br /> Y C O N T R O L R E S U L T S <br /> Job Number 990932 Report Date 05/31/1999 <br /> CUSTOMER IT Group PROJECT Southland - Martinez ATTN Shelby Lathrop <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> MSO Matrix Spike Duplicate 04043001 990931-2 05/26/1999 0202 <br /> Parameter/Test Description QC Result QC Result True Value Ortg Value Calc Result * Limits <br /> itenzene 47 913 49 906 50 0 95 8 39-150 <br /> 4 20 <br /> Ethylbenzene 48 988 50 71Z 50 3 412 91 2 32-160 <br /> 3 20 <br /> ethyl-t-Butyl Ether (MTBE) 233 642 236 241 250 0 93 5 50-150 <br /> 1 25 <br /> Toluene 48 912 51 261 50 1 081 95 7 46-148 <br /> 5 20 <br />�ylenes (total) 155 541 160 609 150 10 55 96 7 75-125 <br /> 3 20 <br /> MB Method Blank 05/27/1999 1149 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> O7B ,ene 0 00 <br /> benzene 0 00 <br /> l-t-Butyl Ether (MTBE) 0 00 <br /> ne 0 00 <br /> Xylenes (total) 0 00 <br /> LCS Laboratory Control Sample 09043002 05/27/1999 1307 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> enzene 47 82 50 95 6 _ 39-150 <br /> thylbenzene 45 79 50 91 6 32-160 <br /> Methyl-t-Butyl Ether (MTBE) 229 24 250 91 7 50-150 <br />�oluene 47 90 50 95 8 46-148 <br /> ylenes (total) 143 19 150 95 5 75-125 <br /> LCD Laboratory Control Sample Duplicate 09043002 05/27/1999 1333 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> Benzene 47 30 47 82 50 94 6 39-150 <br /> 1 1 20 <br /> thylbenzene 45 12 45 79 50 90 2 32-160 <br /> 1 5 20 <br /> Methyl-t-Butyl Ether (MTBE) 225 95 229 24 250 90 4 50-150 <br /> loluene 46 77 47 90 50 93 5 2546-148 <br /> ytenes (total) 141 19 143 19 150 94 1 20 75 125 <br /> 1 4 20 <br /> Page 10 <br /> * %/ 7 REC, R=RPD, A=ABS Diff 0=% Diff <br />