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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (415) 686-9600 • 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 /> Y <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> I Nickel Zinc Cadmium Chromium <br /> Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst S Foster S Foster S Foster S Foster <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Jun 24, 1991 Jun 24, 1991 Jun 24, 1991 Jun 24, 1991 <br /> QC Sample# 106-3140 106-3140 106-3140 106-3140 <br /> Sample Cone.. 110 36 N D 87 <br />• Spike Cone <br /> Added: 500 500 500 500 <br /> Cone. Matrix <br /> Spike- 500 440 410 520 <br /> Matrix Spike <br /> %Recovery 78 81 82 87 <br /> Cone. Matrix <br /> Spike Dup 520 440 410 520 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery. 82 81 82 87 <br /> Relative <br /> % Difference: 39 0 0 0 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> `SEOUOIA ANALYTI AL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Cone Added <br /> WRelative%Difference Cone of M S -Cone of M S D x 100 <br /> J la R Malerstein (Cont of M 5 + Cone of M 5 D) 2 <br /> P lett Manager 1060575APs <110> <br />