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® SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> �g(4;;165)364-9500 • FAX(415)364-9233 <br /> Waterwork Client Project ID 367/Chevron,Stockton <br /> 1710 Main Street f <br /> Escalon.CA 95320 <br /> Attention Tina LePage QC Sample GrouAI063516-3518 Reported Jul S. 1991 <br /> a3fXa+YFSrikuw.we:' ,Yc25aq,W�.'.3t4�O�,.��zNsf Fvz] aN. .srQ.��.:v.XA",.4�k <br /> GUAUTY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene xylenes <br /> Method EPA 8024 EPA 8024 EPA 9024 EPA 8024 <br /> Analyst G M&"( G Meyer G Meyer G Meyer <br /> Reporting Units no 119 ng ng <br /> Date Analyzed Jul 1. 1991 Jul 1, 1991 Jul 1. 1991 Jul 1. 1991 <br /> CC Sample 11# Gst-K 070191 GBLK 070191 GBLK 1774191 GBLK 070191 <br /> Sample Conc. M D N D N D N D <br /> Spike Conc <br /> ~ Added 100 100 100 300 <br /> iConc Matrix <br /> Spike 100 100 100 300 <br /> Matrix Spike <br /> %Recovery: 100 100 100 100 <br /> Conc Matrix <br /> Spike Dup 100 100 100 300 <br /> Mari lx Spike <br /> Duplicate <br /> %Recovery 100 100 100 100 <br /> Relative <br /> %Difference 00 00 00 00 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S Cone of Sample x 100 <br /> Spike Conc Added <br /> RelaLw%Dflerence Conc of M S Conc of M S D x 100 <br /> et ll ac (Fonc of M S +Conc of M 9 D)/2 <br /> P oject Manager 1063518 WAT <2> <br /> i <br />