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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> l � v <br /> RESNA Industries Client Project ID Arco #2130, Stockton <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jay Johnson QC Sample Group 2080488-89 Reported Sep 4, 1992 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA B02 <br /> Analyst Chiaravallots Chiaravalloti Chiaravalloti Chiaravalloti <br /> Reporting Units ppb ppb ppb ppb <br /> Date Analyzed Sep 1, 1992 Sep 1 1992 Sep 1 1992 Sep 1, 1992 <br /> F QC Sample# 208-0484 208-0484 208-0484 208-0484 <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 10 10 11 20 <br /> Matrix Spike <br /> % Recovery- 100 100 110 100 <br /> Conc. Matrix <br /> Spike Dup 10 11 11 21 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 100 110 110 105 <br /> Relative <br /> % Difference 00 95 0 0 4 9 <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 /> �l / / Spike Conc Added <br /> Relative%Difference Conc of M S Conc of M S D x 100 <br /> Michael R Giles (Conc of MS } Conc of M S D)/2 <br /> Laboratory Director <br />. 2080488 RES <2> <br />