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(ORECORE LABORATORIES 0 U A L t T Y C 0 N T R 0 L R E S U L T S Job Number 990932 Report Date 05/31/1999 CUSTOMER IT Group PROJECT Southland - Martinez ATTN Shelby Lathrop QC Type Description Reag Code Lab ID Dilution Factor Date Time LCD Laboratory Control Sample Duplicate 09043002 05/26/1999 1354 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits enzene 52 74 49 31 50 105 5 39-150 6 7 20 Ethylbenzene 50 26 47 34 50 100 5 32-160 6 0 20 ethyl-t-Butyl Ether (MTBE) 302 45 252 00 250 121 0 50-150 18 2 25 Toluene 52 30 48 83 50 104 6 46-148 6 9 20 �lenes (total) 158 69 149 50 150 105 8 75-125 6 0 20 MS Matrix Spike 09043001 990931-2 05/27/1999 0136 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result ' Limits 0ne 49 90 50 0 00 99 8 39-150 enzene 50 71 50 3 41 94 6 32-160 1-t-Butyl Ether (MTBE) 236 24 250 0 00 94 5 50-150 oluene 51 26 50 1 08 100 4 46-148 Xylenes (total) 160 60 150 10 54 100 0 75-125 MSD Matrix Spike Duplicate 09043001 990931-2 05/27/1999 0202 Parameter/Test Description QC Result QC Result True Value Orig Value Catc Result * Limits nzene 47 91 49 90 50 0 00 95 8 39-150 4 20 Ethylbenzene 48 98 50 71 50 3 41 91 1 32-160 3 20 thyl-t-Butyl Ether (MTBE) 233 64 236 24 250 0 00 93 5 50-150 1 25 Toluene 48 91 51 26 50 1 08 95 7 46-148 20 �lenes (total) 155 53 160 60 150 10 54 96 7 75-125 3 20 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 Benzene 49 906 50 0 99 8 39-150 Ihy lbenzene 50 712 50 3 412 94 6 32-160 thyl t-Butyl Ether (MTBE) 236 241 250 0 94 5 50 150 t' e 51 261 50 1 081 100 4 46-148 X (total) 160 609 150 10 55 100 0 75-125 1 Page 9 * / % REC R=RPD A=ABS Diff D=% Diff ,