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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 1D Arco #2133, Stockton <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Minser QC Sample Group 203-0453 Reported Mar 26, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Chromium Copper Zinc <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst C Chapman C Chapman C Chapman C Chapman Chiaravalloti Chiaravalloti Chiaravalloti <br /> Reporting Units ppb ppb ppb ppb mg/L mg/L mg/L <br /> Date Analyzed Mar 25 1992 Mar 25, 1992 Mar 25, 1992 Mar 25, 1992 Mar 24, 1992 Mar 24, 1992 Mar 24, 1992 <br /> QC Sample# 20303648 20303648 2030364B 2030364B 203-0408 203-0408 203-0408 <br /> Sample Cone - N D N D N D N D N D 0 018 0 038 <br /> Spike Cone <br /> Added. 10 10 10 20 1 1 1 • <br /> Cone Matrix <br /> Spike 95 96 10 18 086 097 093 <br /> Matrix-Spike <br /> % Recovery 95 96 100 90 86 96 88 <br /> Cone Matrix <br /> Spike Dup 96 96 10 18 097 1 1 091 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 96 96 100 90 97 104 86 <br /> Relative <br /> % Difference 1 00 00 00 12 13 22 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> G 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 /> 2030453 BBB <3> <br />