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�_. :: ..:'r �y <br /> ... ', s. <br /> �3 w, F '_m t � <br /> .' •'' r ` �"d.';'"' :. r <br /> $ .-.. <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City.CA 94063 <br /> R (415)364-9600 • FAX(415)36,4.9233 <br /> Delta Environmental C)nsultants Ctlent Project ID:40-88-586.01 /Shelf,Stockton,Cl1 " <br /> 3330 Data Drive <br /> Rancho Cordova.CA 95670 <br /> Attention Steve Meese QC Sample Group 1020032-6 Reported: Feb 7 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene benzene_ Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: G.Meyer G.Meyer G.Meyer G.Meyer <br /> Reporting Units: no ng ng no <br /> Date Analyzed: Feb 4, 1991 Feb 4. 1991 Fels 4. 1991 :,Ib 4. 1991 <br /> CC Sample#: G1012488 G1012468 G1012488 G1012488 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 100 100 100 300 <br /> Conc.Matrix <br /> Spike: 98 100 100 310 <br /> Matrix Spike <br /> Recovery: 98 100 100 100 <br /> Conc.Matrix <br /> Spike Dup.: 97 98 99 300 <br /> <s <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 97 98 99 100 <br /> Relative <br /> %Difference: 1.0 2.0 2.0 2.6 <br /> EQUOIA ANALYTICAL %Reeovery: Conc.01 M.S.•Conc.of Sample x 100 <br /> ' Spike Conc.Added <br /> i n f- <br /> r � <br /> 1 r� �; Relative%DiflRrence: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> Maife A'McBlr '_ (Conc.of M,S.+Conc.of M.S.D.i 2 <br /> Project Manager 1020032.DLT <2> <br />