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1 <br /> Q UAL I T Y C O N T R O L R E S U L T S <br /> Job Number 992528 Report Date.: 12/14/1999 <br /> CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Teicheira <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> MSD Matrix Spike Duplicate 09112901 992528-1 12/08/1999 0453 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> ethyl-t-Butyl Ether (MTBE) 135 09 133 00 100 000000 5 47 129 6 71-142 <br /> 2 31 <br /> 1,2-Dichloroethane 12 81 12 95 10 000000 0 44 123 7 70-130 <br /> 1 30 <br /> 2-Dibromoethane (EDB) 8 68 8 20 10 000000 0 86.8 70-130 <br /> 6 30 <br /> Test Method EPA 8260B Batch 10096 Analyst gfb <br /> Method Description Volatile Organics by GC/MS Units ug/L <br /> MS Matrix Spike 09112901 992454-1 11/29/1999 2128 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> tert-Buty( Alcohol, (TBA) 1224 71 1000 000000 2 53 122 2 — 34-182 <br /> opropyl Ether 47 32 50 000000 0 94 6 60-131 <br /> tert-Butyt Ether CETBE) 47 54 50 000000 0 95 1 64-138 <br /> P,brt-AmyL Methyl Ether 48 75 50 000000 0 97.5 67-154 <br /> Methyl-t-Butyl Ether (MTBE) 102 29 100 000000 0 68 101 6 71-142 <br /> 10 36 10 000000 0 103 6 70-130 <br />,1,2-Dlchloroethane <br /> 1,2-Dibromoethane (EDB) 9 39 10 000000 0 93 9 70-130 <br /> MSD Matrix Spike Duplicate 09112901 992454-1 11/29/1999 2156 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Catc Result * Limits F <br /> tent-Butyl Alcohol (TBA) 1053 25 1224 71 1000 000000 2 53 105 1 34-182 <br /> 15 19 <br />'Di-Isopropyl Ether 47 66 47 32 50 000000 0 95 3 60-131 <br /> 1 24 <br /> Ethyl tert-Butyl Ether (ETBE) 50 03 47 54 50 000000 0 100 1 64-138 <br /> 5 29 <br />[tert-AmyL Methyl Ether 52 81 48 75 50 000000 0 105.6 67-154 <br /> 8 27 <br /> Methyl-t-Butyl Ether (MTBE) 107 46 102.29 100 000000 0 68 106 8 71-142 <br /> 5 31 <br />,1,2-D,chlor,,etlar,e 10 95 10 36 10 000000 0 109 5 70-130 <br /> 6 30 <br /> 1,2-Dibromoethane (EDB) 9 37 9 39 10 000000 0 93 7 70-130 <br /> 0 30 <br /> MS Matrix Spike 09112901 992528-1 T 12/08/1999 0424 <br /> Parameter/Test Description QC Result QC dtesutt True Value Orig Value Calc Result * Limits F <br />'tert-Butyl Alcohol (TBA) 1129 43 1000 000000 0 112 9 34-182 <br /> D -Isopropyl Ether 46 66 50 OOOOOD 0 93 3 60-131 <br /> tert-Butyl Ether (ETBE) 52 57 50 000000 0 04 105 1 64-138 <br /> Amyl Methyl Ether 51 06 50 000000 0 102 1 67-154 <br /> Methyl-t-Butyl Ether (MTBE) 133 00 100 000000 5 47 127 5 71-142 <br /> Page 17 * %=% REC, R=RPD, A=ABS Diff , D=% Diff <br />