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COULAB CORE LABORATORIES <br /> 1 <br /> QUA 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 IT Group PROJECT Southland - Martinez ATTN Shelby Lathrop <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> ' MS Matrix Spike D9D43001 99D$77-5 05/22/1999 0321 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> Benzene 56 76 50 6 DO 101 5 39-150 <br /> Ethylbenzene 50 16 50 3 15 94 D 32-160 <br /> Methyl-t-Butyl Ether (MTBE) 337 63 250 8 63 131 6 50-150 <br /> Toluene 53 13 50 0 (10 106 3 46-148 <br /> ' Xylenes (total) 159 71 150 0 45 106 7 75-125 <br /> MSD Matrix Spike Duplicate 09043001 490877 5 85/22/1999 0347 <br /> ' Parameter/Test Description QC Result �QC Result True Value Drig Value Calc Result * Limits <br /> Benzene 53 24 56 76 50 6 00 94 5 39-150 <br /> 6 20 <br /> Lthylbenzene 47 65 50 16 50 3 15 89 C 32 160 <br /> 5 20 <br /> Methyl t Butyl Ether (MTBE) 317 80 337 63 250 8 63 123 f 50-150 <br /> 6 25 <br /> Toluene 49 33 53 1� SD 0 00 98 ( 46 148 <br /> 7 20 <br /> encs (total) 150 14 159 71 150 0 45 99 8 75-125 <br /> 6 20 <br /> Test Method EPA 8020A v Batch 6380 Analyst evd <br /> Method Description Volatile Organics -Aromatics Units ug/L <br /> MB Method Blank 05!22/1999 O5fl5 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result Limits <br /> ' Benzene 0 00 <br /> Ethylbenzene 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 05/22/1949 0623 <br /> ' Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> Benzene 51 64 50 103 3 39-150 <br /> Ethylbenzene 49 30 50 98 6 32-160 <br /> ' Methyl t-Butyl Lthei (MTBE) 311 52 250 124 6 50 150 <br /> Toluene 51 42 50 102 8 46-148 <br /> Xylenes (total) 153 96 150 102 6 75 125 <br /> Page 43 <br /> * /=/ RLC, R=RPD, A=ABS Diff D=% Diff <br />