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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive a Redwood City, CA 94063 <br /> • (415) 364-9600 FAX (415) 364-9233 <br /> RESNA v l Client Project ID 'VV0402, Holt Bros, Stockton <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention Bill Channell QC Sample Group 2074698-70Q Reported Aug 10, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Extractable <br /> Hydrocarbons <br /> Method EPA 8015 <br /> Analyst M Tran <br /> Reporting Units ug/L <br /> Date Analyzed Aug 4, 1992 <br /> OC Sample# DBLK080892-x <br /> Sample Conc : N D <br /> Spike Conc <br /> Added 300 <br /> Conc. Matrix <br /> Spike: 230 <br /> Matrix Spike <br /> % Recovery 77 <br /> Conc Matrix <br /> Spike Dup.: 200 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 67 <br /> Relative <br /> % Difference 14 <br /> 0 SEQUOIA ANALYTICAL %Recovery Conc of M S Conc of Sample x 100 <br /> Spike Conc Added <br /> a Relative%Difference Conc of M S -Conc of M S Q x 100 <br /> rl �- (Conc of M S + Conc of M S D) 2 <br /> roject Manager 2074698 wAT <7, <br />