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0 RE �hAB CORE LABORATORIES Q U A L I 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 IO Dilution Factor Hate Time MSO Matrix Spike Duplicate 09043001 990942-5 05/28/1999 1725 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits nzene 49 09 41 54 50 0 98 2 39-150 17 20 Ethylbenzene 47 52 39 16 50 2 88 89 3 32-160 19 20 thyl-t-Butyl Ether (MTBE) 223 34 191 46 250 0 89 3 50-150 15 25 Toluene 49 88 39 99 50 1 67 96 4 46-148 22 20 1lenes (total) 149 34 123 43 150 6 28 95 4 75-125 19 20 Test Method EPA 8260B Batch 6485 Analyst vz 7 Method Description Volatile Organics by GC/MS Units ug/L Matrix Spike 09051803 990881-3 05/25/1999 1130 Parameter/Test Description QC Result QC Result True Value Oria Value Calc Result * Limits tert-Butyl Alcohol (TBA) 942 52 1000 000000 0 94 3 70-130 Isopropyl Ether 46 10 50 000000 0 92 2 70-130 by( tert-Butyl Ether (ETBE) 45 41 50 000000 0 90 8 70-130 rt-Amyl Methyl Ether 47 71 50 000000 0 95 4 70-130 Methyl-t-Butyl Ether (MTBE) 98 48 100 000000 0 98 5 70-130 �2-Dichloroethane 10 43 10 000000 0 104 3 70-130 2-Dibromoethane (EDB) 10 18 10 000000 0 101 8 70-130 MSD Matrix Spike Duplicate 09051803 990881-3 05/25/1999 1159 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result w Limits tert Butyl Alcohol (TBA) 1083 56 942 52 1000 000000 0 108 4 70-130 14 30 Isopropyl Ether 51 68 46 10 50 000000 0 103 4 70-130 11 30 Ethyl tent-Butyl Ether (ETBE) 51 04 45 41 50 000000 0 102 1 70-130 12 30 rt-Amyl Methyl Ether 51 33 47 71 50 000000 0 102 7 70-130 7 30 lthyt-t-Butyt Ether (MTBE) 110 90 98 48 100 000000 0 110 9 70-130 12 30 2-Dichtoroethane 10 98 10 43 10 000000 0 109 8 70-130 5 30 2-Dtbromoethane (EDB) 10 24 10 18 10 000000 0 102 4 70-130 1 30 Page 12 REC, R=RPD, A=ABS Diff D=% Diff I(,I L s Cr 1 ly I Ik