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Q UAL I T Y C O N T R O L R E S U L T S Job Number 992710 Report Date 01/06/2000 CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Teocheira QC Type Description Reig Code Lab ID Dilution Factor Date Time MSD Matrix Spike Duplicate 09111501 992702-1 01/06/2000 1133 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F enzene 57 411 63 82 50 15 15 84 5 39-150 11 20 Ethylbenzene 50 393 52 06 50 2 56 95 7 32-160 3 20 ethyl-t-Butyl Ether (MTBE) 1168 995 1161 26 250 1043 52 50 2 50-150 1 25 Toluene 49 04 51 96 50 3 73 90 6 46-148 6 20 i, ylenes (total) 163 874 166 68 150 11 83 101 4 75 125 2 20 Test Method EPA 82603 Batch 10423 Analyst am Method Description Volatile Organics by GC/MS Units ug/L c Matrix Spike 09112901 992556-6 12/07/1999 1TD5 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F tert-Butyl Atcohol (TBA) 1317 66 1000 000000 0 131 8 48-194 i-isopropyl Ether 38 89 50 000000 0 77 8 53-149 Itthyt tert-Butyl Ether (ETBE) 43 21 50 000000 0 86 4 53-148 ert-Amyl Methyl Ether 42 90 50 000000 0 85 8 49-158 Methyl-t-Butyl Ether (MTBE) 111 38 100 000000 0 43 111 0 44-190 1,2-Dichloroethane 11 04 10 000000 0 110 4 70-130 2-Dibromoethane (EDS) 8 29 10 000000 0 82 9 70-130 MSD Matrix Spoke Duplicate 09132901 992556-6 12/07/1999 1740 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F tert-Butyl Alcohol (TBA) 1036 41 1317 66 1000 000000 0 103 6 48-194 24 21 Y Di-Isopropyl Ether 32 89 38 89 50 000004 0 65 8 53-149 117 15 Y Ethyl tert-Butyl Ether (ETBE) 35 82 43 21 50 000000 0 19 6 2853-148 ert-Amyl Methyl Ether 36 71 42 90 50 000000 0 6 4 4849-158 ttethyl-t-Butyl Ether (MTBE) 94 5D 111 38 100 000000 0 43 946 1 2144-190 1,2-Dichloroethane 9 97 11 04 10 000000 0 99 7 70-130 10 30 ,1,2-Dibromoethane (EDB) 6 17 8 29 10 000000 0 61 7 70-130 x 29 30 �I Page 11 * %=% REC, R=RPD, A=ABS Diff , D=% Diff