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i <br /> `♦ SEQUOIA( ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> ««; h?,=. <br /> �n� �.'iri..l,S�:..nS,�i`v. .�F2�lK':ii*i14ti�:Si4i 'r i•:.-.,'.:`. <br /> - Stockton <br /> �I� . EA}�92-1:h+Arco#548 <br /> Tech. C1 lent Project D- <br /> " Engineeririg Science&Tec ) / / <br /> 41-A Lafayette Circle <br /> Lafayette, CA 94549 <br /> }Attention: Brian Thomas QC Sample Group: 302-1136 Reported: Apr 3, 1992 <br /> vv::.:�::.::.::.........^::n:�.vrnw,,:...::v.::. ......w:x3l.:..r.nnvnww,.vl-vw-...x.�4.vi:..::•:....................n -:... .. :.........:::. - .. ..... <br /> DUALITY CONTROL DATA REPORT <br /> ` ANALYTE TCLP TCLP <br /> Selenium Lead <br /> 1� Method: EPA 270.2 EPA 239.2 <br /> Analyst: K.N. S.Chin <br /> Reporting Units: mg/L mg/L <br /> Date Analyzed: Mar 31, 1992 Mar 30, 1992 <br /> QC Sample#: 203-4225 203-4407 <br /> Sample Cone.: N.D. 0.20 <br /> ike Cone. <br /> Added: 1.0 1.0 <br /> Conc. Matrix <br /> Spike: 0.89 1.2 <br /> Matrix Spike <br /> %Recovery: 89 100 <br /> Conc. Matrix <br /> Spike Dup.: 0.93 1.2 <br /> Matrix Spike <br /> Duplicate <br /> i' %Recovery: 93 100 <br /> Relative <br /> %Difference: 4.4 0.0 <br /> QIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample x 100 <br /> Spike Conc.Added <br /> i <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. z 100 <br /> tC tt A. Chieffo (Conc.of M.S. + Conc.of M.S.D.) 2 <br /> roject Manager 2031136.EEE <10> <br />