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1 SEQUOIA( ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> E4;En :.A ::•'rin •. I >ArStock-ton <br /> nee hScience�&Tech. Client Project DEA-92�-1-� Arco 9 9 1 / / <br /> 41-A Lafayette Circle <br /> >€Lafayette, CA 94549 <br /> :Attentlon: Brian Thomas QC Sample Group: 203-1136 Reported: Apr 3, 1992 <br /> .. ]:iiN'3}'vi\Fi.� h:' m-rcxv:x.+:.xxvnv».w3'h.'::S:i{J:.rvl-.:4Y:S':f:3.'4::3.•'J. :.:{-:.:ti.::+•. :.":f.-:::4�r .}}.:. 3:f}:'\' <br /> ....::.: .L.. :} AL.i.......................... : .... .�.... .;v:.::•:tiv::::.'rxvlv::.:.:,v.-:.v::rvv xv <br /> :.v-::.. ::. ... <br /> .............................k...... .. ................................. ..................:.::.:.:.:,.:.....:...... ...........: .:b:..b... <br /> :.....,..:<-}::'.;i-:;r::;:zxtra:;:::;;:::k:>s;<:i:;:::;:Sii::i::;;k::�,�;W:::.;;::xtst-:';;�;.:s:;::ti;;r;c:;�;iii:;:::k:::x::zi:::r:�:::ii::z::hit�::t`.`..........:.....x...,..,.........:...�:..:...,,vcf:,r.'»or."�='�%= <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Selenium Lead Mercury <br /> Method: EPA 7740 EPA 6010 EPA 7471 <br /> Analyst: S.Foster $.Foster M.C. <br /> Reporting Units: mg/kg mg/kg mg/kg <br /> Date Analyzed: Mar 3o, 1992 Mar 30, 1992 Mar 31, 1992 <br /> QC Sample#: 203.OSM 203-055e 203-ss <br /> Sample Conc.: N.D. 14 0.016 <br /> Ike Conc. <br /> Added: 25 5o 0.25 <br /> Conc. Matrix <br /> Spike: 25 56 0.22 <br /> Matrix Spike <br /> %Recovery: 100 84 82 <br /> Conc. Matrix <br /> Spike Dup.: 26 55 0.23 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 104 82 86 <br /> Relative <br /> % Difference: 3.9 1.8 4.4 <br /> ! UOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample x loo <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Conc,of M.S.D. x 100 <br /> FOtt A. ieffo (Conc.of M.S. + Conc,of M.S.D.)/2 <br /> roject Manage Page 3 of 3 20311XEEE <8> <br />