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�R <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415)364-96110 FAX(415)364.9233 <br /> Delta Environmental Collstaltarits Client Project IP: #40 89(}t2,She1l,Tracy <br /> :.3330 Data Drive <br /> Rancho Cordova,CA 95670 <br /> Reported Mar 7 1991 <br /> .Attention: Jim 8rownBrownellGC Same Group 103-0023 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene <br /> Toluene Ethyl Xyienes <br /> benzene <br /> Method: <br /> EPA820 EPA= EPA820 EPA 820 <br /> Analyst: Hoffman/Gloria Hoffman/Gloria otfm ng Glori offm r�g Gloria <br /> Reporting Units: no no <br /> Sample Analyzed.Date <br /> QC : G13LK030491 G13LK030491 GBLK030491 (;BLK053491 <br /> Sample Conc.: N.D. <br /> N.D. N.D. N.D. <br /> 'pike Cone. 100 100 300 <br /> Added: 100 <br /> Can..Matrix 100 100 310 <br /> Spike: 88 <br /> Matrix Spike 100 100 100 <br /> %Recovery: <br /> Conc.Matrix 94 93 280 <br /> Spike Dup.: 93 <br /> Matrix Spike <br /> Duplicate 94 93 93 <br /> OA Recovery: 93 <br /> Relative 6.2 7.3 7.3 <br /> %Difference: 5.5 <br /> ----- --- --- - --- -_'` - Recovery:-- <br /> Conc.o1 M.S..Conc.of Sample x 100 <br /> - 7UfJ1A-ANALYTiCAE=----- - - <br /> Spike Conc:Added -- -- _-_- - ---- <br /> 00 <br /> Relative%Ditferencc: fAnc,of M.S.•Conc.of M.S.D.M.S.I]. <br /> (cont.of M.S.+ (ant.of fd.S.a.)12 i030023.DLT <2> <br /> Maile A.Mcf3ifn ,� r <br /> Project Manager-:- - _ <br />