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SEQUOIA ANALYTICAL
<br /> 680 Chesapeake Drive + Redwood City, CA 94063
<br /> (415) 364-9600 + FAX (415) 364-9233
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<br /> ;Ft SNA Gent Project ID W0388, Reeves Exxon/Tracy
<br /> 1710 Main Street
<br /> Escaton, CA 95320 =°
<br /> Attention Greg Stahl QC Sample Group 204-4326 Reported May 7, 1992
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<br /> QUALITY CONTROL DATA REPORT
<br /> ANALYTE Mercury STLC Mercury Antimony Barium Beryllium Cadmium Chromium
<br /> Method EPA 7471 EPA 245 1 EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 5010
<br /> Analyst J Martinez J Martinez M Mistry M Mistry M Mistry M Mistry M Mistry
<br /> Reporting Units mg/kg mg/L mg/kg mg/kg mg/kg mg/kg mg/kg
<br /> Date Analyzed Apr 28, 1992 May 6, 1992 Apr 30, 1992 Apr 30, 1992 Apr 30, 1992 Apr 30, 1992 Apr 30, 1992
<br /> OC Sample# 204-4e09 205.0106 204-4$52 2044852 204-4852 204-4852 204.4852
<br /> Sample Cone.: 0 065 N D N D 61 N D N D 12
<br /> Spike Cone.
<br /> Added: 010 00020 50 50 50 50 50
<br /> Cone. Matrix
<br /> Spike: 015 00020 52 110 50 50 62
<br /> Matrix Spike
<br /> %Recovery, 85 100 104 98 100 100 100
<br /> Cone Matrix
<br /> Spike Dup.: 015 00021 54 110 51 51 63
<br /> Matrix Spike
<br /> Duplicate
<br /> %Recovery: 85 105 108 98 102 102 102
<br /> Relative
<br /> %Difference: 00 49 38 00 20 20 16
<br /> .SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100
<br /> ( Spike Conc Added
<br /> vV Y 1�G� Relative%Difference Cone of M S -Conc of M S D x 100
<br /> a 1. a (Conc of M S + Conc of M S D) 2 �WAT <7�
<br /> P oject Manager
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