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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> Brawn& Caldwell Client Project ID Arco #2133, Stockton <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Misner QC Sample Group 206-0611 Reported Jul 6, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method E=PA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravatloti Chiaravalloti Ch:aravalloto Chiaravalloti <br /> Reporting Units ppb ppb ppb ppb <br /> Date Analyzed Jul 1, 1992 Jul 1, 1992 Jul 1 1992 Jul 1 1992 <br /> QC Sample # BLK063092 BLK063092 BLK063092 BLK063092 <br /> Sample Cone N D N D N D N D <br /> Spike Conc <br /> Added 10 10 10 20 <br /> Conc Matrix <br /> Spike 90 93 93 19 <br /> Matrix Spike <br /> % Recovery 90 93 93 95 <br /> Conc Matrix <br /> Spike Dup 89 92 92 19 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 89 92 92 95 <br /> Relative <br /> % Difference 1 1 1 1 1 1 00 <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 /> •�� �,`�9��� Splits Conc Added <br /> ��'� 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 /> 2060611 BCP <2> <br />