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` SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> ,i> . . vn v} .'� - ,.. ,.cis -.•:. .,�.�"�H ,. ' <br /> RESNA V' r ' Client Project ID W0402, Holt Bros, Stockton <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention Ball Channell QC Sample Group 2074698-700 Reported Aug 10, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-D ehloroethene Trichloroethene Chloro- <br /> benzene <br /> Method EPA 601 EPA 601 EPA 601 <br /> Analyst L Duong L.Duong L Duong <br /> Reporting Units E,rg/L Mg/L {tg/L <br /> Date Analyzed Jul 31, 1992 Jul 31, 1992 Jul 31, 1992 <br /> OC Sample# VBLK073192 VBLK073192 VBLK073192 <br /> Sample Conc : N D N D N D <br /> Spike Conc. <br /> Added 25 25 25 <br /> Conc Matrix <br /> Spike: 27 20 21 <br /> Matrix Spike <br /> % Recovery. 108 80 84 <br /> Conc Matrix <br /> Spike Dup.: 26 20 20 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 104 80 80 <br /> Relative <br /> %Difference 38 00 49 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> �CA Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Frollect_ (Conc of M S + Conc of M S D) 2 <br /> Manager 2074698 WAr <8> <br />