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j SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> i <br /> ERM-West Client Project ID #121803, Safeway-Stockton <br /> 2001 P Street, Suite 200 <br /> Sacramento, CA 95814 <br /> Attention David Betts QC Sample Group 2080475-77 Reported Sep 9, 1992 <br /> DUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene xylenes Diesel <br /> EPA <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 8015 Mod <br /> Analyst Chiaravalloti Chiaravalloti Chiaravalloti Chiaravalloti Chiaravalloti <br /> Reporting Units ppb ppb ppb ppb ppb <br /> Date Analyzed Sep 1, 1992 Sep 1, 1992 Sep 1, 1992 Sep 1, 1992 Sep 8, 1992 <br /> CC Sample # 208-0484 208-0484 208-0484 208-0484 BLK090492 <br /> Sample Cone: N D N D N D N D N D <br /> Spike Cone <br /> Added 10 10 10 20 600 <br /> Cone Matrix <br /> Spike 10 10 11 20 540 <br /> Matrix Spike <br /> % Recovery 100 100 110 100 90 <br /> Cone Matrix <br /> Spike Dup. 10 11 11 21 550 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 100 110 110 105 92 <br /> Relative <br /> % Difference 00 95 00 49 18 <br />. SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> h Relative%DifferenceConc 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 /> 2080475 ERS <3> <br />