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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> s <br /> Brown& Caldwell Client Project ID Arco #2133, Stockton <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Misner OC Sample Group 208-0439 Reported Sep 1, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravalloti Chiaravatloti Chiaravallob Chiaravalloti <br /> Deporting Units ppb ppb ppb Ppb <br /> Date Analyzed Aug 28 1992 Aug 28, 1992 Aug 28 1992 Aug 28, 1992 <br /> QC Sample # 208-0380 208-0380 208-0380 208-0380 <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- 95 10 10 19 <br /> Matrix Spike <br /> % Recovery: 95 100 100 95 <br /> Conc Matrix <br /> Spike Dup 99 11 11 19 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 99 110 110 95 <br /> Relative <br /> % Difference: 41 95 95 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTIC ) %Recovery Conc of M S -Conc of Sample x 100 <br /> r / / r Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of MSD x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D) 2 <br /> Laboratory Director <br /> 2080439 BCP <2> <br />