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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 Misner QC Sample Group 207-0164 Reported Jul 14, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Copper Nickel Zinc Lead <br /> Method EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst S Foster S Foster S Foster S Foster S Foster S Foster <br /> Reporting Units mg/L mg/L mg/L mg/L mg/L mg/L <br /> Date Analyzed Jul 14, 1992 Jul 14, 1992 Jul 14, 1992 Jul 14, 1992 Jul 14, 1992 Jul 14, 1992 <br /> QC Sample # 207-0187 207-0187 207-0187 207-0187 207-0187 207-0187 <br /> Sample Conc.. N D 0 016 0 011 N D 038 N D <br /> Spike Conc. <br /> 1110 Added: 10 10 10 10 10 10 <br /> Conc. Matrix <br /> Spike: 10 10 11 10 14 11 <br /> Matrix Spike <br /> % Recovery 100 98 109 100 102 110 <br /> Conc Matrix <br /> Spike Dup : 10 11 11 11 1 4 11 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 100 108 109 110 102 110 <br /> Relative <br /> % Difference 00 95 00 95 00 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 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 /> 2070164 BCP <4> <br />