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_ - - my o <br /> ZZ 0 <br /> r 680 Chesapeake Drive • redwood City,CA 94063 <br /> (d76)364.9600 a FAX(415)364.9233 <br /> ax: . ..: <br /> rlNatf3nrro Client Protect I!?:Reevga on,388 <br /> �1710 Main Street <br /> i E-,:Won,CA 85320 <br /> Attention: Bill Channell OC Sam a Grnu : 104.29&4 Re rted:Ir4a 1. 1931 <br /> .'� <br /> I <br /> F <br /> QUALITY CONTROL DATA REPORT <br /> f� - — <br /> Benzene Toluene Benz <br /> ene Xylenes <br /> i <br /> Method: EPA 8020 EPA 49020 EPA 8420 EPA 8020 <br /> Analyst: S.Hoffmann S.Hoffmann S.Halfmann S.Hoffmann <br /> Reporfaig units: n0 no no r.2 <br /> Date Analyzed: Apr 10, 1901 Apr 18, 1991 Apr 1i„ '.991 Apr 18, 1991 <br /> QC Sample#: GBLKG41a01 GBLX041891 GBLK041991 GBLK041821 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> ,. Spike Cone. <br /> Added: 100 100 100 . 300 <br /> Cane.Matrix <br /> Spike: 100 100 100 300 <br /> :a Matrix Spika <br /> %Recovery: 1fu. 100 100 100 <br /> Conc.Matrix <br /> Spike Dup.: 100 100 100 300 <br /> Matrix Spike <br /> Duplicate <br /> - %Recovery: 100 100 100 100 <br /> Relative <br /> I <br /> %Difference: 0.4 0.0 01 0 0•0 <br /> SEQUOIA ANALYTICAL7 x Recovery: Cent.-M.S.•fnne.at Sample K IDD <br /> _ spike Conc.Added <br /> j �• •! i ( FSelaiive%Difference. - — Gene,of M S. Conc.o!M.S.Q. TT x 100 — <br /> a eth t1ae i5one.of M.S.+Cuna.of M.S.D.)!2 <br /> r " P oject Manager <br /> .1 <br /> #:. <br /> it <br /> �,._ ''. .'' S_; - ✓%fid - .. S1 <br />