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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM s Concord, California 94520 <br /> (415) 686-9600 0 FAX (415) 686-9689 <br /> Applied GeoSystems (Sacramento) Client Project ID ARCO #760/#760-91-1 <br /> 4191 E Power Inn Rd <br /> Sacramento, CA 95826 <br /> Attention Eloise Frick QC Sample Group 106-0575 Reported Jun 24, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> alpha-6HC Aldrin Dieldrin <br /> Method EPA 8080 EPA 8080 EPA 8080 <br /> Analyst M T M T M T <br /> Reporting Units yg/kg u9/kg ug/kg <br /> Date Analyzed Jun 24, 1991 Jun 24, 1991 Jun 24, 1991 <br /> QC Sample# BLK062491 BLK062491 BLK062491 <br /> Sample Conc- N D N D N D <br /> i <br /> Spike Conc <br /> Added 25 25 50 <br /> Conc. Matrix <br /> Spike 19 18 43 <br /> Matrix Spike <br /> %Recovery. 76 72 86 <br /> Conc Matrix <br /> Spike Dup : 24 22 44 <br /> Matrix Spike , <br /> -- Duplicate <br /> %Recovery: 96 88 88 <br /> Relative <br /> %Difference. 23 20 23 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTIC L %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of MS -Cone of M S D x 100 <br /> J 1 R Malerstein (Conc of M S + Conc of M S D) 2 <br /> i P ect Manager 1060575 APS <6> <br />