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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 ATTR Bob Butler QC Type Description Reag Code Lab ID Dilution Factor Date Time LCD Laboratory control Sample Duplicate 09043002 05/27/1999 1333 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits enzene 47 30 47 82 50 94 6 39-150 1 1 20 Ethylbenzene 45 12 45 79 50 90 2 32-160 1 5 20 Rethyt-t-ButyL Ether (MTBE) 225 95 229 24 250 90 4 50-150 1 4 25 oluene 46 77 47 90 50 93 5 46-148 2 4 20 ylenes (total) 141 19 143 19 150 91 4 2075-125 Test Method EPA 8260B Batch 6485 Analyst vz Method Description Volatile Organics by GC/MS Units ug/L Matrix Spike 09051803 990881-3 05/25/1999 7130 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits tert-Butyl Alcohol (TBA) 942 52 1000 000000 0 94 3 y 70 130 i-Isopropyl Ether 46 10 50 000000 0 92 2 70-130 tthyl tert-Butyl Ether (ETBE) 45 41 50 000000 0 90 8 70-130 ert-Amyl Methyl Ether 47 71 50 000000 0 95 4 70-130 ethyL-t-Butyt. Ether (MTBE) 98 48 100 000000 0 98 5 70-130 1,2-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 D9051803 990881-3 05/25/1999 1159 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits ert-Butyl Alcohol (TBA) 1083 56 942 52 1000 000000 0 108 4 70-130 14 30 �i-Isopropyl Ether 51 68 46 10 50 000000 0 103 4 70-130 11 30 thyl tent-Butyl Ether (ETBE) 51 04 45 41 50 000000 0 102 1 70-130 12 30 ert-Amyl Methyl Ether 51 33 47 71 50 000000 0 102 7 70-130 7 30 ethyl-t-Butyl Ether (MTBE) 110 90 98 48 100 000000 0 110 9 70-130 12 30 1,2-Dichloroethane 10 98 10 43 10 000000 0 109 8 70-130 5 30 2-Dibromoethane (EDB) 10 24 10 18 10 000000 0 102 4 70-130 1 30 ' Page 9 * %=% REC, R=RPD, A=ABS Diff D=% Diff