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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 Steven Misner QC Sample Group 204-0181 Reported Apr 20, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes Cadmium Copper Nickel <br /> Method EPA 8020 EPA 8024 EPA 8020 EPA 8020 EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst C Chapman C Chapman C Chapman C Chapman Chiaravalloti Chiaravalioti Chiaravalloti <br /> Reporting Units ppb ppb ppb ppb mg/L mg/L mg/L <br /> Date Analyzed Apr 15 1992 Apr 15 1992 Apr 15 1992 Apr 15 1992 Apr 13, 1992 Apr 13 1992 Apr 13, 1992 <br /> QC Sample# 2040127B 20401278 20401276 2040127B 2040060 2040060 204-0060 <br /> Sample Conc N D N D N D N D N D 0 038 N D <br /> Spike Conc <br /> Added 10 10 10 20 1 1 1 <br /> Conc Matrix <br /> Spike 87 88 88 17 096 1 097 <br /> Matrix-Spike — <br /> % Recovery 87 88 88 85 96 96 97 <br /> Conc Matrix <br /> Spike Dup 9 94 9 1 18 097 1 1 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 90 94 91 90 97 96 100 <br /> Relative <br /> % Difference 34 66 34 57 1 0 00 30 <br /> SEQUOIA ANALYTICAL % 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 /> Ir11C ael R <br /> des (Conc of M S + Conc of M S D J/2 <br /> Laboratory Director <br /> 2040181 BCP <3> <br />