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1 <br /> 16 (09ELAB CORE LABORATORIES <br /> 1 Q U A L I T Y C 0 N T R 0 L R E S U L T S <br /> Job Number 990932 Report Date 05/31/1999 <br /> CUSTOMER TT Group PROJECT Southland - Martinez ATTN Shelby Lathrop <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> Test Method EPA 8020A Batch 6483 Analyst evd <br /> Method Description Volatile Organics Aromatics Units ug/L <br /> MB Method Blank 05/28/1999 0949 <br /> Parameter/Test Description QC Result OC Result True Value Orig Value Calc Result * Limits <br /> enzene 0 <br /> thylbenzene 0 <br /> Methyl-t-Butyl Ether (MTBE) 0 <br /> Toluene 0 <br /> 1ylenes (total) 0 00 <br /> LC5 Laboratory Control Sample 09043002 05/28/1999 1117 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> Benzene 49 73 50 99 5 y 39-150 <br /> 0E lbenzene 47 69 50 95 4 32-160 <br /> l-t-Butyl Ether (MTBE) 206 65 250 82 7 50-150 <br /> ne 49 92 50 99 8 46-148 <br /> 0Lbenzene <br /> (total) 149 57 150 99 7 75-125 <br /> LCD Laboratory Control Sample Duplicate 09043002 05/28/1999 1212 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> Ienzene 52 13 49 73 50 104 3 39-150 <br /> 4 7 20 <br /> thylbenzene 51 97 47 69 50 103 9 32-160 <br /> 8 6 20 <br /> ethyl-t-Butyl Ether (MTBE) 250 98 206 65 250 100 4 50-150 <br /> 19 4 25 <br /> lotuene 52 68 49 92 50 105 4 46-148 <br /> 5 4 20 <br /> Xylenes (total) 164 37 149 57 150 109 6 75-125 <br /> 9 4 20 <br /> MS Matrix Spike 09043001 990942-5 F <br /> 05/28/1999 1659 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result " Limits <br /> Benzene 41 54 50 0 83 1 39 150 <br /> Ethylbenzene 39 16 50 2 88 72 6 32 160 <br /> Nythyl-t-Butyl Ether (MTBE) 191 46 250 0 76 6 50 150 <br /> luene 39 99 50 1 67 76 6 46-148 <br /> tenes (total) 123 43 150 6 28 78 1 75 125 <br /> • <br /> Page 11 <br /> %=I' REC, R=RPD A=A65 Diff D=/ Diff <br /> uM if <br />