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1 <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX(415) 364-9233 <br /> Emcon Associates Client Project ID Sheil,3725 Tracy Blvd.Tracy <br /> 1433 N Market Blvd <br /> Sacramento, CA 95834 <br /> Attention Sheila Krulse CC Sample Group 2022631 -33 - n Reported Feb 21, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br />[ Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J Villar J Villar J Villar J Vifiar <br /> Reporting Units pg/L pg/L lig/L pg/L <br /> Date Analyzed Feb 19, 1992 Feb 19, 1992 Feb 19, 1992 Feb 19, 1992 <br /> OC Sample# BLK021992 BLK021992 SLO21992 BLK021992 <br /> Sample Cone.: N D N D N D N D <br /> Spike Cone. <br /> Added: 10 10 10 30 <br /> ICone. Matrix <br /> Spike: 99 99 97 30 <br /> Matrix Spike <br /> %Recovery: 99 99 97 100 <br /> Conc. Matrix <br /> Spike Dup.: 10 10 10 31 <br /> Matrix Spike <br /> Duplicate <br /> C %Recovery: 100 100 100 103 <br /> Relative <br /> 1 % Difference: 10 10 30 33 <br /> C <br /> 0 SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> c Spike Conc Added <br /> ige <br /> Relative 96 Difference Conc of M S -Conc of M S D x 100 <br /> Mails A Spnnr J r (Conc of M S + Conc of M S D)/2 <br /> Project Manager 2022631 EEE �2, <br />