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r 0kA'8 - 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 991898 Report Date. 09/23/1999 <br /> CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Teichera <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br /> LC5 Laboratory Control Sade 09090102 09/21/1999 1647 <br /> Parameter/Test Description QC Result QC Result True Value Orig. Value Calc Result * Limits F <br /> 1asoline Range Petroleum Hydrocarbons 1066 1000 0 106.6 _5O-_150 <br /> 1 LCD Laboratory Control Sample Duplicate '09090102 09/21/1999 1713 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Gasoline Range Petroleum Hydrocarbons 981 1066 1000 0 98.1 50-150 <br /> 8.3 30 <br /> MS Matrix Spike 09090102 991901-2 09/22/1999 0457 <br />' Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Gasoline Range Petroleum Hydrocarbons 1037 1000 0 46 _ 99 50-150 <br /> SD Matrix Spike Duplicate — 09090102 991901-2 09/22/1999 0523 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Gasoline Range Petroleum Hydrocarbons 1062 1037 1000 0 46 102 50-150 <br /> 2 4 30 <br />' Test Method EPA 8021B Batch - 8627 Analyst evd <br /> Method Description Volatile Organics -Aromatics Units ug/L <br /> MB I Method Blank 09/20/1999 2150 <br /> Parameter/Test Description QC Result QC Result True Value Orig. Value Calc Result " Limits F <br /> Benzene 0 00 <br /> Ethylbenzene 0 00 <br /> Methyl-t-Butyl Ether (MTBE) 0 00 <br /> Toluene 0 08 <br /> Xylenes (total) 0 00 <br /> tLC5 Laboratory Control Sample '09090101 09/20/1999 2308 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 51 94 50 103 9 39-150 <br /> Ethylbenzene 50 88 50 101 8 32-160 <br /> Methyl-t-Butyl Ether (MTBE) 261 86 250 104 7 50-150 <br /> Toluene 52 59 50 105 2 46-148 <br /> Xylenes (total) 157 83 150 105 2 75-125 <br /> go <br /> Page 11 I <br /> * %_% REC, R=RPD, A=RBS Diff D=% Diff <br /> Tne dnalyl fal Iesulls OP100 s 0 nI6�010I.I0ns.Goupon nlw"1 11-1 male u11,W1I by Ins d-T 10—111 eRClusrve and co nr""a use In ss epcn—peace made T..a el rt cad Ies Is Pn n—0 nl srwratal-s <br /> e pr.-._Bsenl the Gasl IudBmanl of Cay 1,a ,.jon 0O Wnpla[pnes noweYei mexas n0 wa I—,or rep esenral on a P ass 0 mel a0 01 any t'Pe and e P 0631}a So—same"IP the umd"t,1/Pm Pal­8ons 0 P oI Ia rareness 01 <br /> any PI gas LOaI or Plwa m n0 d1 p100enV++011 pl sane n LO�napt pn wTh..On such I.p M s used pl IsI-uppn Ip any reason was e w Th s e ,l sha I r u,gwmjcaw *no e 0 In I,a 1 with0ul Ins wr flan app—,01 CP a Ut—at—s <br />