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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City CA 94063 <br /> {415) 364-9600 • FAX (415) 364-9233 <br /> RESNA Client Project ID 38009-5, City of Stockton/Fire Dept <br /> 42501 Albrae Street, Suite 100 <br /> Fremont CA 94538 <br /> Attention Anthony Eneno OC Sample Group 209-0769 Reported Sep 18, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE lead <br /> Reactive Sulfide Flashpoint pH STLC <br /> Method EPA 9030 EPA 1010 EPA 9040 EPA 6010 <br /> Analyst K Follett K Follett Y Arteaga M Mistry <br /> Reporting Units mg/kg `C NA mg/L <br /> Date Analyzed Sep 9, 1992 Sep 9, 1992 Sep 9 1992 Sep 14 1992 <br /> OC Sample # 209-0748 209-0747 209-0745 209-0844 <br /> Sample Conc . N D 55 8 5 0 21 <br /> • Spike Conc <br /> Added: 1300 N A N A 10 <br /> Conc Matrix <br /> Spike 1600 NA NA 9 5 <br /> Matrix Spike <br /> % Recovery 123 N A N A 93 <br /> Conc Matrix <br /> Spike Dup 1700 55 85 93 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 131 N A N A 91 <br /> Relative <br /> Difference 61 00 00 21 <br /> • SEOIJOIA ANALYTICAL % Recovery Conc of M S -Conc of SaMDle x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of MS -Cone of M S D x 100 <br /> Mana Lee (Conc of M S + Conc of M S D) / 2 <br /> Protect Manager 2090769 ENS <3> <br />