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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 Steve Misner QC Sample Group 208-0170 Reported Aug 20, 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 Chiaravailoti Chiaravailoti Chiaravallob <br /> Reporting Units ppb ppb ppb ppb <br /> Date Analyzed Aug 13, 1992 Aug 13, 1992 Aug 13, 1992 Aug 13, 1992 <br /> QC Sample # 20"102 20a-o102 20e-0102 20s-o102 <br /> Sample Cone : N D N D N D N D <br /> Spike Cone. <br /> Added 10 10 10 20 <br /> Cone Matrix <br /> Spike 99 11 10 19 <br /> Matrix Spike <br /> % Recovery 99 110 100 95 <br /> Cone. Matrix <br /> Spike Dup 10 11 11 21 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery. 100 110 110 105 <br /> Relative <br /> % Difference 1 0 95 10 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample x 100 <br /> (J <br /> ��ell Spike Conc Added <br /> Relative%Difference Cone of M S -Cone of M S D x 100 <br /> Michael R Giles (Cone of M S + Cone of M S D)/2 <br /> Laboratory Director <br /> 2080170 BCP <3> <br />