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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> NO (415) 686-9600 a FAX (415) 686-9689 <br /> 1 <br /> Applied GeoSystems (Sacramento) Client Project ID Arco#2130-90-1/Stockton <br /> 4191 E Power Inn Rd <br /> Sacramento, CA 95826 <br /> Attention Eloise Frick QC Sample Group 106-0609 A-D Reported Jun 27, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> JANALYTE <br /> Total Lead <br /> Method EPA 7421 <br /> Analyst N Herrera <br /> Reporting Units mg/kg <br /> Date Analyzed Jun 26, 1991 <br /> QC Sample# 1060609 A-D <br /> Sample Conc.. 0 049 <br /> I <br /> *Spike Conc. <br /> Added. 0 010 <br /> Conc Matrix <br /> I Spike. 0 056 <br /> Matrix Spike <br /> %Recovery. 70 <br /> i <br /> Conc. Matrix <br /> Spike Dup.: 0 057 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 80 <br /> Relative <br /> % Difference: 18 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> -5lA ANALYTI AL Recovery Conc of M S -Conc of Sample rY p x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br />�Jidi4liaR IMersteln (Conc of MS + Conc of M S D)/2 <br /> rolect Manager 1060603 APS <7> <br />