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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> i (510) 686-9640 FAX (510) 686-9689- <br /> • w ...... ....... . .. ::::::::::: :. :::.::. k <br /> M. :.:. <br /> .......... <br /> w.: .....'O...z..0............ .:...:i.:.:.............. ...... .................................:.....,....:...................-:.:.•.-:::...:�:-::::::n- ....K.::.•::::::•:�.v...n........:...............v.....::i%i:r.:i:R;'S;vwx:::Ywn'acii• <br /> :..�,: .4:..c.. .�..... ..c..� <br /> .EA Engineering Science&Tech. Client Project ID: E4-92-1/Arco#548/Stockton <br /> ' 41-A Lafayette Circle <br /> <>Lafayette, CA 94549 :} <br /> Attention: Brian Thomas QC Sam le Group: 203-1136 Reported: Apr 3, 1992 <br /> .: u....vv........nn...inM:JC�hL:t:'LSn.:w.u.,:x..n...,n:.:.:..v......rn....-...v.,T <br /> •�:l:ti~r, 4`.i'�- ..R4:.u...v...2.......v...nn.:....v.....:..:LvStiti .Yn <br /> :.k::w;2`:t$iE�s.....a�:g::fiw. .4.�k:R:n,,..M1::i'•it:ttii :is :...}Y <br /> x <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Molybdenum Nickel Silver Thallium Vanadium Zinc Arsenic <br /> Method: EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 E=PA 6010 EPA 6010 <br /> Analyst: S.Foster S.Foster S.Foster S.Foster S.Foster S.Foster S.Foster <br /> Reporting Units: mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed: Mar 3o, 1992 Mar 30, 1992 Mar 30, 1992 Mar 30, 1992 Mar 30, 1992 Mar 30, 1992 Mar 30, 1992 <br /> ©C Sample#: 203-0558 203-OSM 203.OSW 2034)558 203-OSW 203-0558 203-OSM <br /> Sample Cone.: 17 53 N.D. N.D. 30 35 19 <br /> ike Cone.' <br /> Added: 50 50 50 50 50 50 50 <br /> Conc. Matrix <br /> Spike: 66 106 50 49 87 85 66 <br /> Matrix Spike <br /> %Recovery: 98 106 100 98 114 100 94 <br /> Conc. Matrix <br /> Spike Dup.: 61 101 49 53 79 89 60 <br /> Matrix Spike <br /> Duplicate <br /> ' %Recovery: 88 96 98 106 98 108 82 <br /> Relative <br /> %Difference: 7.9 4.8 2.0 7.8 9.6 4.6 9.5 <br /> GUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample x 100 <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> Cott hieffo (Conc.of M.S. + Conc.of M.S.D. 2 <br /> Project Manage Page 2 of 3 2031136.£EE <7a <br />