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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento CA 95834 <br /> ' (916) 921 9600 • FAX (916) 921 0100 <br /> EMCON Associates Client Project ID Shell, 4445 Pershing Ave Stockton <br /> 1433 N Market Blvd <br /> Sacramento, CA 95834 <br /> Attention Jim Prttllla OC Sample Group 210-0202 Reported Oct 22, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Lead <br /> Method EPA 239 2 <br /> Analyst D Ballard <br /> Reporting Unrts mg/L <br /> Date Analyzed Oct 16 1992 <br /> OC Sample # 210-0229 <br /> Sample Cone : ND <br /> Spike Cone. <br /> Added 10 <br /> Cone. Matrix <br /> Spike: 10 <br /> Matrix Spike <br /> % Recovery. 100 <br /> Cone. Matrix <br /> Spike Dup. 10 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 100 <br /> Relative <br /> %Difference: 00 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> WA01W <br /> Relative%Difference Cone of IVIS -Conc of M S D x 100 <br /> Michael R Giles (Cone of M S + Conc of AA S D) 2 <br /> Laboratory Director <br /> 2100199 EMC <6> <br />