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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 /> 723SSt <br /> Sacramento, CA 95814 <br /> Attention Steve Misner QC Sample Group 209-0309 Reported Sep 25, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravalloti Chiaravalloti Chiaravalloti Chiaravalloti <br /> Reporting Units ug/L ug/L u9/L p9/1- <br /> Date <br /> 9/LDate Analyzed Sep 24 1992 Sep 24, 1992 Sep 24, 1992 Sep 24, 1992 <br /> QC Sample # BLK092492 BLK092492 BLK092492 BLK092492 <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: 82 85 86 17 <br /> Matrix Spike <br /> % Recovery 82 85 86 85 <br /> Conc Matrix <br /> Spike Dup : 83 86 86 18 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 83 86 86 90 <br /> Relative <br /> %Difference- 1 2 1 2 00 5 4 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICA %Recovery Conc 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 /> 2090309 BRS <2> <br />