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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> . (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA Iridustnes oh ��� ��� ''^"'^�'"""rrna..mw'`'..•..N , <br /> Client Project ID Arco#2168, Stockton <br /> 3164 Gold Camp Or, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Cherven CC Sample Group 204-0711 Reported May 13, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Hexavalent <br /> Zinc Undane Heptachlor Aldrin Dieldrin Chromium Diesel <br /> EPA <br /> Method EPA 6010 EPA 8080 EPA 8080 EPA 8080 EPA 8080 EPA 7196 8015 Mod <br /> Analyst S Foster R DiMajo R DoMwo R DiMa+o R DtMaio S Foster Chiaravalloti <br /> Reporting Units mg/kg ppo ppb ppb ppb mg/kg ppm <br /> Date Analyzed May 6, 1992 May 6, 1992 May 6, 1992 May 6, 1992 May 6, 1992 Apr 30, 1992 May 6, 1992 <br /> CC Sample# 204-0617 BLK050592 BLK050592 BLK050592 BLK050592 204-0711 BLK050692 <br /> Sample Conc.. 87 N D N D N D N D N D N D <br /> Spike Cone <br /> Added: 50 25 25 25 10 50 15 <br /> Conc. Matrix <br /> Spike: 136 24 25 24 98 38 14 <br /> Matnx Spike <br /> % Recovery: 98 96 100 96 98 76 93 <br /> Conc. Matrix <br /> Spike Dup.: 131 24 27 25 10 37 13 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 88 96 108 100 100 74 87 <br /> Relative <br /> % Difference: 38 00 77 41 20 27 67 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICA %Recovery Conc of M S -Conc of Sampie x 100 <br /> Spike Conc Added <br /> Relative%Ofference Conc of MS -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 t 12> <br />