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i <br /> i.> <br /> i <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415)364.9600 FAX(415)364-9233 <br /> Waterwork Client Project ID: 00148-2,Stockton Wastewater <br /> 1710 Main Street <br /> FiEscaion CA 95320 <br /> Attentlon Dave Welch OC Sample Group - Reported Nov 16, 1989 <br /> ` QUALITY CONTROL DATA REPORT <br /> '`' ANr1t.YfE Benzene Toluene Ethyl xylenes <br /> l Benzeno <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: K.Mitchell K.Mitchell K.Mitchell K.Mitchell <br /> Reporting Units: ppb ppb ppb ppb <br /> Date Analyzed: Nov 10, 19a9 Nov 10, 1989 Nov t0, 19M Nov 10, 1989 <br /> ., OC Sample#: Matrix Matrix Matrix Matrix <br /> r�1 <br /> Sample Conc: N.D. N.D. N.D. N.D. <br /> 1.... Spike Conc. <br /> t:e <br /> ~ Added: 2.5 2.5 2.5 7.5 <br /> F� <br /> Conc.Matrix <br /> Spike: 23.2 20.9 22.9 68.9 <br /> Matrix Spike <br /> %Recovery: 93 84 92 92 <br /> i F <br /> Conc.Matrix <br /> Spike Dup.: 23.4 20.7 23.1 68.4 <br /> Matrix Spike <br /> Duplicate <br /> °b Recovery: 94 83 92 91 <br /> �o <br /> Relative <br /> %Difference: 0.86 0.96 0.87 0.73 <br /> �tf <br /> SEQUOIA ANALYTICAL %Fle.overy. � Conc.or M.S.-Conc.of Sample x loo <br /> � <br /> Spike Cone.Added <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. X100 <br /> n A. ]orkman (Conc.of M.S.r Conc.of M.S.D.)/2 <br /> o t Manager <br /> 9110025.V1'AT <2> <br /> q <br />