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COULAB CORE LABORATORIES Q U A L I T Y C O N T R O L R E S U L T S Job Number 990931 Report Date 05/31/1999 CUSTOMER IT Group PROJECT Southland - Martinez ATTN- Bob Butler QC Type Description Reag Code Lab ID Dilution Factor bate Time Test Method EPA 8020A Batch 6461 Analyst evd Method Description Volatile Organics -Aromatics Units ug/L MS Matrix Spike 09043001 990931-2 05/26/1999 0136 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits enzene 49 906 50 0 99 8 39-150 thylbenzene 50 712 50 3 412 94 6 32-160 ethyl-t-Butyl Ether (MTBE) 236 241 250 0 94 5 50-150 Toluene 51 261 50 1 081 100 4 46-148 ylenes (total) 160 609 150 10 55 100.0 75-125 MSD Matrix Spike Duplicate 09043001 990931-2 05/26/1999 0202 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits Benzene 47 913 49 906 50 0 95 8 39-150 4 20 benzene 48 988 50 712 50 3 412 91 2 32-160 3 20 fethyl-t Butyl Ether (MTBE) 233 642 236 241 250 0 93 5 50-150 1 25 otuene 48 912 51 261 50 1 081 95 7 46-148 5 20 9 ylenes (total) 155 541 160 609 150 10 55 96 7 75-125 3 20 MB Method Blank 05/27/1999 1149 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits enzene 0 00 thylbenzene 0 00 ethyl-t-Butyl Ether (MTBE) 0 00 Toluene 0 00 ylenes (total) 0 00 LCS Laboratory Control Sample 09043002 05/27/1999 1307 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits Benzene 47 82 50 95 6 _ 39-150 Ethylbenzene 45 79 50 91 6 32-160 Ftenes hyl-t-Butyl Ether (MTBE) 229 24 250 91 7 50-150 uene 47 90 50 95 8 46-148 (total) 143 19 150 95 5 75-125 Page 8 * �=6 REC, R=RPD, A=ABS Diff D=% Diff � n I � I w Illn I G