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SEQUOIA ANALYTICAL <br /> 819 Stryker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 * FAX (916) 921-0100 <br /> fo^6�S.f '0 ' r M, ...................... <br /> Groundwater Techfidogy Client Project ID #023201468,Golden Grain,Manteca,CA <br /> 4057 Port Chicago Hwy <br /> Concord,CA 94520 <br /> Attention Chris Desocio OC Sample Group 2100082-8311: Reported Oct 16, 19921 <br /> Y,, ^k .dM„ va^grt^ asp 3�C '�'Fr°'oarort' 4M' nrov%,f- <br /> S� <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene ft benzene Monet toad <br /> Method EPA 602 EPA 502 EPA 602 EPA 602 EPA 2392 <br /> Analyst Cthistavaliotl Clhtwovallotl Ch;L-&% lid Chlaravai'-A D Bli:..•d <br /> Reporting Units vg/L vg/L Ng/L vg/L mg/L <br /> Date Analyzed Oct 13, 1992 Oct 13, 1992 Oct 13, 1992 Oct 13, 1992 Oct 13, 1992 <br /> OC Sample# 2104M 210.0090 210-0090 210.0090 210-0176 <br /> Sample Conc.: N D N D N D N D N D <br /> Spike Conc. <br /> Added: 10 10 10 20 0 050 <br /> Conc.Matrix <br /> Spike: 82 87 <br /> 8 8 17 0047 <br /> Matrix Spike <br /> %Recovery: 82 87 86 85 94 <br /> Conc.Matrix 16 0 049 <br /> Spike Dup.: 81 87 86 <br /> Matrix Spike <br /> Dupheate 80 98 <br /> %Recovery: 81 87 86 <br /> Relative <br /> %Difference: 1.2 0 0 0 0 61 4 2 <br /> SEQUOIA ANA LYTI L x Reoovery Conc of M S -Coneof Sample x 100 <br /> Spike Conc Added <br /> Relative%Dlnerenee Conc of M S -Conc of M s D x 100 <br /> Michael R Was Conc of M S + Conc of M S D} 2 <br /> Laboratory Director =0062GRC <3> <br />