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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> Waterwork Client Project ID: City of Stockton, Banner Island <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention: Bill Channell OC Sample Group: - Reported: Nov 22, 1989 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Snenium Lead Antimony Arsenio 9eryllium Cadmium Chromium <br /> Method: EPA 7740 EPA 7421 EPA 6010 EPA 7061 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst: R. Britton R. Britton S. Foster K Lewis 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: Nov 14, 1W9 Nov 15. 1989 Nov 20, 1989 Nov 20, 19% Nov 20, 1989 Nov 20, 1989 Nov 20. 1989 <br /> OC Sample #: 911-0656 911-0656 911-0656 9112609 9110656 9110656 9110656 <br /> Sample Conc.: 0.0032 0.03 0.11 0.015 0.022 N.D. 0.64 <br /> Spike Conic. <br /> Added: 10 10 5.0 0.1 1.0 10.0 10.0 <br /> Conc. Matrix <br /> Spike: 6.6 9.8 4.65 0.13 0.895 10.07 10.27 <br /> Matrix Spike <br /> %Recovery: 56 98 75.8 115 87.3 100.7 96.3 <br /> Cones Matra <br /> Spike Dup.: 7.6 9.0 4.34 0.12 0.989 10.28 10.93 <br /> Matra Spike <br /> Duplicate <br /> X Recovery: 76 90 84.6 105 96.7 102.8 102.9 <br /> Relative <br /> X Difference: 14 8.5 11.0 9.1 10.2 2.0 6.6 <br /> SEQUOIA ANALYTIC L %may: Conc.of M.S.-Conc.of Samole x 100 <br /> Spike Conc.Added <br /> ieRelative%Difference: Cone.of M.S.-Conic.of M.S.D. z 100 <br /> A, B orkman (Cone.of M.S. • Conic.of M.S.D.)/2 <br /> t Manager 9110&%.WAT <3> <br />