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OULAS CORE LABORATORIES <br /> ' Q U A L I T Y C 0 N T R 0 L R E S U L T S <br /> Job Number 990890 Report Date 05/26/1999 <br /> ' CUSTOMER* IT Group PROJECT- Southland - Martinez ATTNa Shelby Lathrop <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> ' MS Matrix spike 09051803 990881-3 05/25/1999 1130 <br /> Parameter/Test Description QC Result QC Result True VaLue Orig Value Calc Result * Limits <br /> tert-Butyl Alcohol (TBA) 942 52 1000 000000 0 94 3 _ 70-130 <br /> Di-Isopropyl Ether 46 10 50 000000 0 92 Z 70-130 <br /> Ethyl tert-Butyl Ether (ETRE) 45 41 50 000000 0 90 8 70-130 <br /> tert-Amyl Methyl Ether 47 71 50 000000 0 95 4 70-130 <br /> Methyl-t-Butyl Ether (MTBE) 98 48 100 000000 0 98 5 70-130 <br /> 1,2-Dichloroethane 10 43 10 000000 0 104 3 70-130 <br /> 1,2-Dibromoethane (EDB) 10 18 10 000000 0 101 8 70-130 <br /> ' MSD Matrix Spike Ouplieate04051$03 990881--3 05/25/1999 1159 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> I <br /> tert-Butyl Alcohol (TBA) 1083 56 942 52 1000 000000 0 108 4 70-130 <br /> 14 30 <br /> DI-Isopropyl Ether 51 68 46 10 50 000000 0 103 4 70-130 <br /> 11 30 <br /> yL tent-Butyl Ether (ETRE) 51 04 45 41 50 000000 0 102 1 70-130 <br /> 12 30 <br /> -Amyl Methyl Ether 51 33 47 71 50 000000 0 102 7 70-130 <br /> 7 30 <br /> Methyl-t-Butyl Ether (MTBE) 110 90 98 48 100 000000 0 110 9 70-130 <br /> 12 30 <br /> 11,2-Dichtoroethane 10 98 10 43 10 000000 0 109 8 70-130 <br /> 5 30 <br /> 1,2-Dibromoethane (EDB) 10 24 10 16 10 000000 0 102 4 70-130 <br /> 1 30 <br /> LCS Laboratory Control Sample 09051803 05/25/1999 2132 <br /> Parameter/Test Description QC Result QC Result True Value Orig VaLue Calc Result * Limits <br /> Itert-ButyL A(cohoL (TBA) 924 12 1000 000000 92 4 70-130 <br /> Di-Isopropyl Ether 51 61 50 000000 103 2 70-130 <br /> Ethyl tert-Butyl Ether (ETBE) 50 27 50 000000 100 5 70-130 <br /> tert-Amyl Methyl Ether 49 98 50 000000 100 0 70-130 <br /> Methyl-t-Butyl Ether (MTBE) 102 70 100 000000 102 7 70-130 <br /> 1,2-Dichloroethane 10 72 10 000000 107 2 70-130 <br /> 1,2-Dibromoethane (EDB) 9 55 10 000000 95 5 70-130 <br /> MB Method Blank 05/25/1999 2201 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits <br /> �tert-Butyi Alcohol (TBA) 0 <br /> Do-Isopropyl Ether 0 <br /> Ethyl tert-ButyL Ether (ETBE) 0 <br /> 'tert-Amyl Methyl Ether 0 <br /> Methyl-t-Butyl Ether (MTBE) 0 <br /> 1 2-Dichloroethane 0 <br /> ibromoethane (EDB) 0 <br /> ' Page 10 <br /> * %=% REC, R=RPD, A=ABS Diff D=% Diff <br /> I! I tyt c 11 [s Its p{>,nlPl { p 1c scol I IIs Iwl 1 5 I IPI IP IvalO a d I 9u..ly I Iln wnl CI s a 1Lo n1 t1 n[,11 so Ht Igoil� v Iv i[p r Is C[ 1 � ! 5 <br /> aPio tlrP uson[Ila basil Jll nl of Cn <br /> nYbyls rycI � wv akBs n{ ll s lit 111 01 <br /> nnY1 li 1[„ IIlli I I fY1-1�! -5130 <br /> SIU Ifl { 1 ?e PPLM[ 1 <br />