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SEQUOIA ANALYTICAL <br /> 1900 Sates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> ori Associates Client Project lb ARCO #2093=g3=i`Tracy ` "" <br /> 1855 Gateway Blvd, Ste 770 <br /> Concord, CA 94520 <br /> .#Attention Paul Sample QC Sample Group #3070572-73 Reported Jul 30, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> IAWNALYTB <br /> R- aside Sulfide <br /> Method SW 846 EPA 9030 <br />' Analyst AS K N <br /> Date Jul 27, 1993 Jul 27, 1993 <br />' Sample # 9307B34-1 A 9307834-1 <br /> Sample Conc - N D N D <br /> 1 <br /> Sample <br /> Duplicate <br /> Concentration: N D N D <br /> 91RPD, 00 00 <br /> Control Limits: ±20 ±20 <br /> OU014T7- <br /> %Recovery Cone o Cone o Sample x 100 <br /> Spike Cone Added <br /> Relative%Difference Cone of M S -Cone of M S D x 100 <br /> Kenneth K F Lee nc of M S + Cone of 2 <br /> Laboratory Director <br /> #F3070572 ROU X47 <br />