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.LAB CORE LABORATORIES <br /> 0 U A L I T Y C 0 N T R 0 L R E S U L T S <br /> Job Number 990931 Report Date 05/31/1999 <br /> CUSTOMER IT Group PROJECT Southland - Martinez ATTN Bob Butler <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> LCS Laboratory Control Sample 09051803 05/28/1999 1809 <br /> Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits <br /> t,ert-ButyL <br /> Alcohol (TBA) 1080 60 1000 000000 108 1 70-130 <br /> -Isopropyl Ether 45 20 50 000000 90 4 70-130 <br /> Ethyl tert-ButyL Ether (ETRE) 44 54 50 000000 89 1 70-130 <br /> ert-Amyl Methyl Ether 45 91 50 000000 91 8 70-130 <br /> ethyl-t-Butyl Ether (MTBE) 104 99 100 000000 105 D 70-130 <br /> ,2-Dichloroethane 9 70 10 000000 97 0 70-130 <br /> ,2-Dibromoethane (EDS) 10.30 10 000000 103 0 70-130 <br /> MB Method Blank 05/28/1999 1837 <br /> Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits <br /> 4ert-ButyL Alcohol (TBA) 0 - <br /> i-Isopropyl Ether 0 <br /> thyl tert-Butyl Ether (ETRE) 0 <br /> i6,2Dibromoethane <br /> Amyl Methyl Ether 0 <br /> l-t-Butyl Ether (MT8E) 0 <br /> ichloroethane 0 <br /> t <br /> (EDB) 0 <br /> Ms Matrix Spike 09051803 990931-2 05/28/1999 1934 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> Iert-Butyl Alcohol (TBA) 599 72 500 000000 0 119 9 70-130 <br /> i-Isopropyl Ether 24 06 25 000000 0 96 2 70-130 <br /> thyl. tert-Butyl Ether (ETRE) 24 38 25 000000 0 97 5 70-130 <br /> tert-Amyl MethyL Ether 25 17 25 000000 0 100 7 70-130 <br /> ethyl-t-Butyl Ether (MTBE) 54 93 50 000000 0 109 9 70-130 <br /> 2-Dichloroethane 5 16 5 000000 0 103 2 70-130 <br /> ,2-Dibromoethane (EDB) 4 98 5 000000 0 99 6 70-130 <br /> MSD LMatr,�Xspl <br /> ke Duplicate 09051803 990931-2 05/28/1999 2002 <br /> Parameter/Test Description OC Result OC Result True Value Orig Value Calc Result * Limits <br /> ert-Butyi Alcohol (TBA) 637 37 599 72 500 000000 0 127 5 _ 70-130 <br /> 6 30 <br /> i-Isopropyl Ether 24 62 24 06 25 000000 0 98 5 70-130 <br /> 2 30 <br /> Ethyl tert-Butyl Ether (ETRE) 24 77 24 38 25 000000 0 99 1 70-130 <br /> 2 30 <br /> Frt-AmyL Methyl Ether 26 39 25 17 25 000000 0 105 6 70-130 <br /> 5 30 <br /> Methyl-t-Butyl Ether (MTBE) 56 41 54 93 50 000000 0 112 8 70-130 <br /> 3 30 <br /> ,2 Dichloroethane 5 81 5 16 5 000000 0 116 2 70-130 <br /> 12 30 <br /> ibromoethane (EDB) 5 55 4 98 5 000000 D 111 0 70-130 <br /> 11 30 <br /> ' Page 10 <br /> * G=� REG, R=RPD, A=ABS Diff D=% Diff <br /> r o, <br />