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SEQUOIAS ANALYTICAL �
<br /> 1900 Bates Avenue Suite _MConcord, California 94520
<br /> (510) 686-9600 • FAX (510) 686-9689
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<br /> EA Engineering Science&Tech. Client Project ID: EA-92-1/Arco#548/Stockton tv
<br /> ;41-A Lafayette Circle
<br /> Lafayette, CA 94549 {>
<br /> Attention: Brian Thomas CC Sample Group: 203-1136 Reported: Apr 3,. 1992 "p
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<br /> tQUALITY CONTROL DATA REPORT
<br /> ANALYTE
<br /> Antimony Barium Beryllium Cadmium Chromium Cobalt -Co2p
<br /> ' Method: EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010
<br /> Analyst: $.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 30, 1992 Mar 30, 1992 Mar 30, 1992 Mar 30, 1992 Mar 30, 1992 Mar 30, 1992 Mar 30, 1992
<br /> OC Sample#: 203-0558 20.3-0558 203-0558 203-0558 203-0558 203-0558 203-0558
<br /> Sample Conc: N.D. 67 2.7 1.0 34 12 18
<br /> like Conc.
<br /> Added: 50 50 50 50 50 50 50
<br /> Conc. Matrix
<br /> Spike: 50 121 52 48 90 58 70
<br /> ' Matrix Spike
<br /> %Recovery: 100 108 99 94 112 92 104
<br /> Conc. Matrix
<br /> Spike Dup.: 50 115 51 50 81 58 72
<br /> Matrix Spike
<br /> Duplicate
<br /> ' %Recovery: 100 96 97 100 94 92 108
<br /> Relative
<br /> ' %Difference: 0.0 5.1 1.9 4.1 11 0.0 2.8
<br /> UOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample z 100
<br /> Spike Conc.Added
<br /> Relative%Difference: Conc.of M.S.-Conc,of M.S.D. z 100
<br /> Scott A. Chieff (Conc.of M.S. + Conc.of M.S.D.)/2
<br /> 'Project Manag r Page 1 of 3 2031136.Ei`E <6>
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