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I <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA Industries{ Client Project ID Arco#2168, Stockton <br /> 3164 Gold Camp Dr, Suite 200 <br /> 'Rancho Cordova, CA 95670 <br /> Alterition Eloise Cherven QC Sample Group 204-0711 Reported May 13, 1992 <br /> wr {{ Y ^ r .r v r r r.n♦ r r r { v ry .i s r ry r ryr r 'J r.rw•v` r ry v <br /> i <br /> QUALITY CONTROL DATA REPORT <br /> "YTE Chloro- <br /> 1,1-Dichloroethene Trichloroethene benzene Cadmium Chromium Lead Nickel <br /> I <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst M Nguyen M Nguyen M Nguyen S Foster S Foster S Foster S Foster <br /> Reporting Units Ng/kg Fig/k9 y9/k9 mg/k9 mg/kg mg/k9 mg/k9 <br /> Date Analyzed May 11, 1992 May 11, 1992 May 11, 1992 May 6, 1992 May 6, 1992 May 6, 1992 May 6, 1992 <br /> i QC Sample# BLK051192 BLK051192 BLK051192 204-0617 204-0617 2044)617 2040617 <br /> MS/MSD MS/MSD MS/MSD <br /> Sample Conc.: N D N D N D 19 82 11 110 <br /> Spike Conc. <br /> Added: 10 10 10 50 50 50 50 <br /> Conc. Matrix <br /> Spike. 76 10 86 51 122 58 154 <br /> Matrix Spike <br /> %Recovery 76 100 86 98 80 94 88 <br /> Conc. Matrix <br /> Spike Dup.- 78 10 88 48 119 57 154 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery, 78 100 88 92 74 92 88 <br /> Relative <br /> % Difference. 26 00 23 61 25 17 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> . SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D) 2 <br /> Laboratory Director <br /> 2040705 RES <11 a <br />