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j SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> lop (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 212-0521 Reported Dec 30, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Copper Lead Nickel Zinc <br /> Method EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 9 EPA 200 7 EPA 200 7 <br /> Analyst D Ballard D Ballard D Ballard D Ballard D Ballard D Ballard <br /> Reporting Units mg/L mg/L mg/L mg/L mg/L mg/L <br /> Date Analyzed Dec 30, 1992 Dec 30, 1992 Dec 30, 1992 Dec 17, 1992 Dec 30, 1992 Dec 30, 1992 <br /> QC Sample# 212-0521 212-0521 212-0521 21243352 212-0521 212-0521 <br /> Sample Cone.: N D N D N D N D N D 0 016 <br /> Spike Cone <br /> Added: 10 10 10 0 050 10 10 <br /> Cone. Matrix <br /> Spike 10 1 1 1 1 0 050 10 1 1 <br /> Matrix Spike <br /> %Recovery 100 110 110 100 100 108 <br /> Cone Matrix <br /> Spike Dup : 11 11 12 0 052 11 11 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery. 110 110 120 104 110 108 <br /> Relative <br /> %Difference 95 00 87 39 95 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> 6�4wn� Relative%Difference Conc of M S -Conc of M 5 D x 100 <br /> Michael R Giles (Cont of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> 2120521 BRS <4> <br />