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_ � I <br /> SEQUOU ANALYTICAL C <br /> f � 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> at <br /> erw V>: <br /> rk:;. <br /> Client <br /> Project D... - <br /> . 001' <br /> 3 Stockton <br /> c on <br /> i?1710 Main Street <br /> Smit <br /> Canal' <br /> >Escalon, CA 95320 <br /> Attention: Dave Welch QC Sample Group 910-3364 Reported Nov 2, 1989 <br /> yam. <br /> QUALITY CONTROL DATA REPORT <br /> i <br /> ANALYTE Benzene Toluene Ettlyl Xylenes <br /> Benzene <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: Oct 31, 1N9 Oct 31, 1989 Oct 31, 1989 Oct 31, 1989 <br /> QC Sample#: 910-2237 910-2237 910-2237 910-2237 <br /> Sample Cone.: N.D. N.D. N.D. N.D. <br /> Spike Cone. <br /> Added: 2.5 2.5 25 7.5 <br /> Cone. Matrix <br /> Spike: 2.1 2.1 2.5 5.7 <br /> Matrix Spike <br /> %Recovery: 84 84 100 76 <br /> Cone. Matrix <br /> Spike Dup.: 2.0 1.9 2.2 5.6 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 80 76 88 74 <br /> Relative <br /> %Difference: 1.6 2.5 1.4 1.8 <br /> SEQUOIA ANALYTICAL %Recovery: Cone.of M.S.-Cone.of Semple x too <br /> Spike Cone.Added <br /> Relative%Difference: Cone.of M.S.-Cone.of M.S.D. x 100 <br /> Blom A. Blorkman (Cone.of M.S. + Cone.of M.S.D.) 2 <br /> Project Manager 9103364-WAT <2> <br />