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j SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> 1 <br /> RESNA Industries Client Project ID Arco#6020, Manteca n <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Greg Altiman CC Sample Group 2120558 60-61 Reported Jan 5, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Nitrate <br /> Method EPA 300 0 <br /> Analyst G Fish <br /> Reporting Units mg/i_ <br /> Date Analyzed Dec 18 1992 <br /> CC Sample # 212-2952 <br /> Sample Conc . 12 <br /> Spike Conc. <br /> Added: 10 <br /> Conc Matrix <br /> Spike 22 <br /> Matrix Spike <br /> % Recovery 100 <br /> Conc. Matn). <br /> Spike Dup.: 22 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 100 <br /> Relative <br /> % Difference 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br />. SEQUOIA ANALYTI L %Recovery Conc of M S -Conc of Sample X100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D) /2 <br /> Laboratory Director <br /> 2120558 RES <4> <br />