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l 0 SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue * Suite LM • Concord California 94520 <br /> (415) 686-9600 0 FAX (415) 686-9689 <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 OC Sample Group 106-0609 A-D Reported Jun 27 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Total Lead <br /> Method EPA 7421 <br /> Analyst N Herrera <br /> Reporting Units mg/kg <br /> Date Analyzed Jun 26, 1991 <br /> OC Sample# 1060609 A D <br /> Sample Conc 0 049 <br /> Spike Conc. <br /> Added. 0 010 <br /> Conc. Matrix <br /> Spike, 0 056 <br /> Matrix Spike <br /> %Recovery. 70 <br /> Conc. Matrix <br /> Spike Dup 0 057 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery* 80 <br /> Relative <br /> %Difference' 18 <br /> 46alfty Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOI4ANALZAL %Recovery Conc ofM S -Conc of Sample x 100 <br /> ��MaJerstein <br /> � Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> of (Conc of M S + Conc of M S D)/2 <br /> -_.Project Manager 1D60603APS <7 <br />