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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 OC Sample Group 207-0164 Reported Jul 14, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA6132 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppb ppb ppb ppb <br /> Date Analyzed Jul 10, 1992 Jul 10, 1992 Jul 10, 1992 Jul 10, 1992 <br /> OC Sample# BLK071092 BLK071092 BLK071092 BLK071092 <br /> Sample Conc.: N D N D N D N D <br /> Spike Conc. <br /> Added 10 10 10 20 <br /> Conc Matrix <br /> Spike 86 98 95 18 <br /> Matrix Spike <br /> %Recovery* 86 98 95 90 <br /> Conc Matrix <br /> Spike Dup • 90 99 98 19 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery, 90 99 98 95 <br /> Relative <br /> % Difference 45 10 31 54 <br /> I <br /> Ouality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYT CAL %Recovery Conc of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> 77 <br /> Relative 96 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 /> 2070164 BCP <3> <br />