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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento, CA 95834 <br /> 916) 921-9600 9 FAX (916) 921-0100 <br /> Brown & Caldwell Client Project ID Arco #2133, Stockton <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Tan OC Sample Group 211-0251 Reported Nov 18, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethyibenzene Xylenes <br /> Method EPA 602 CPA 602 EPA 602 I=PA 602 <br /> Analyst Chiaravaliou Chiaravallob Chiaravallotl Chiaravallob <br /> Reporting Units Ng/L pg/1- M9/i Y9/L <br /> Date Analyzed Nov 13, 1992 Nov 13, 1992 Nov 13, 1992 Nov 13, 1992 <br /> QC Sample# 211.0253 211-0253 211-0253 211-0253 <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: 83 87 88 18 <br /> Matrix Spike <br /> %Recovery: 83 87 88 90 <br /> Conc. Matrix <br /> Spike Dup.: 86 91 92 19 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 86 91 92 95 <br /> Relative <br /> % Difference 36 45 44 54 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of MS -Conc of M S D x 100 <br /> Michael R Giles (Corso of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> 2110251 BAS <4> <br />