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at <br /> r - <br /> j SEQUOIA ANALYTICAL <br /> 680 Chesapeake Dnve • Redwood City,CA 94063 <br /> (415)364-9600 FAX(415) 364-9233 <br /> 'Wa et ork Client Project ID W4475 Weber Point <br /> 1710 Main Street <br /> !Escalon,CA 95320 <br /> Attention Tina Le Page QC Sample Group 2041065- _ Reported: Apr 13, 1992 <br /> ,�^��r.^ ,cEx¢r Aw s'r. ^rx• .:c-a�,? 6 :O:r tffv r...+r w.+ `Xa"X ,�°.co�`�`''�{'b`'c�'°.v r:-nti��H..� ..., .,��..nt'y'�v � �-. t .... <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE EtW- <br /> Benzene Toluene benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. M Nipp M Kipp M Nipp M Nipp <br /> Reporting Units lig/L pg/L erg/L erg/L <br /> Date Analyzed. Apr s, 1592 Apr S. 1992 Apr 8, 1992 Apr 8, 1992 <br /> QC Sample# GBLK040892 GBLK040892 GSLK040892 GBLK040892 <br /> MS/MSD MS/MSD MS/MSD MS/MSD <br /> Sample Cone.: N D N D N D N D <br /> Spike Cone. <br /> . Added: 10 10 10 30 <br /> Cone. Matrix <br /> Spike: 97 10 98 30 <br /> Matrix Spike <br /> %Recovery: 97 100 98 100 <br /> Cone.Matrix _ <br /> Spike Dup.: 10 10 10 30 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 100 100 100 100 <br /> Relative <br /> % Difference: 30 00 20 00 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> }t Relatsve%Difference Cone of M S -Cone et M S D u 100 <br /> isa (Cont of M S + Cont of MSD)12 <br /> Jett Manager 2041055 WAT <3> <br />