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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> Brown & Caldwell Client Project ID Arco #2133, Stockton <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Tan OC Sample Group 211-0251 Reported Nov 18, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Copper Lead Nickel Zinc <br /> Method EPA 20U 7 ENA 200 7 EFA 200 7 CPA 239 2 EPA 200 7 EPA 200 7 <br /> Analyst D Ballard D Ballard D Ballard S Foster D Ballard 0 Ballard <br /> Reporting Units mg/L mg/L mg/L mg/L mg/L mg/L <br /> Date Analyzed Nov 17, 1992 Nov 17 1992 Nov 17, 1992 Nov 17 1992 Nov 17 1992 Nov 17, 1992 <br /> OC Sample # 211-0251 211-0251 211-0251 211-0078 211-0251 211-0251 <br /> Sample Cone • N D N D 0 011 N D N D 0 049 <br /> Spike Cone. <br /> Added 20 20 20 10 20 20 <br /> Cone. Matrix <br /> Spike- 20 20 20 094 20 20 <br /> Matrix Spike <br /> % Recovery: 100 100 99 94 100 98 <br /> Cone. Matrix <br /> Spike Dup.: 20 21 21 1 0 20 21 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 100 105 104 100 100 103 <br /> Relative <br /> % Difference- 00 49 49 61 00 49 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL % Recovery Cone of M S -Conc of Sample x 100 <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 /> 2]1025] BR5 <3n <br />