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j SEQUOIA ANALYTICAL <br /> 1904 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> W1a. <br /> , yvtiwprenginee�Yng, Inc V v 'Cljent Project iE) 'Uriocal, 5606 Pacific Ave, Stockton <br /> `2401 Stanwell Dave, Suite 400 <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E OC Sample Group 2060127-128 Reported Jun 17, 1992 v <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Nitrates <br /> Method EPA 300 0 <br /> Analyst G Fish <br /> Reporting Units mg/L <br /> Date Analyzed Jun 4, 1992 <br /> QC Sample# 206-05sa <br /> Sample Conc.: N D <br /> Spike Conc. <br /> Added. 10 <br /> Conc. Matrix <br /> Spike: 98 <br /> Matrix Spike <br /> %Recovery: 98 <br /> Conc Matrix <br /> Spike Dup • 10 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 100 <br /> Relative <br /> %Difference 20 <br /> Laboratory Blank contained the following analytes None detected <br /> OEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> co A Chieffo (Conc of M S + Conc of M s D)T2—2 <br /> Project Manager <br />