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= u SEQUOIA ANALYTICAL = <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> {916) 921-9600 • FAX (916) 921-0100 <br /> RIMSNA I' Cliricfusii� „;-}� > � � . � <br /> I es h ent Pioject ID Arco #2168, Stockton <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek CC Sample Group 3010563-64 Reported Feb 3, 1993 <br /> I QUALITY CONTROL DATA REPORT <br /> ANALYTE 11-Dichioro- Tnchlorc- <br /> Benzene Toluene Eth benzene X enes ethane ethene Chlorabenzene <br /> I <br /> Method EPA 602 EFA 602 EPA 502 EPP e02 EPA W1 EPA C01 EPA 601 <br /> Analyst Chiaravalloti Chiatavalloii Chiaravaiioti Chiaravallotc K Nill K Nill K Nill <br /> Reporting Units ug/L ug/L ug/L ug/L ug/L ug/L ug/L <br /> Date Analyzed Feb 2, 1993 Feb 2 1993 Feb 2, 1993 Feb 2, 1993 Jan 28, 1993 Jan 28, 1993 Jan 28, 1993 <br /> OC Sample# BLK020293 BLK020293 BLK020293 BLK020293 BLK012M BLK012893 BLK012893 <br /> I MS/MSD MS/MSD MS/MSD <br /> Sample Conc.: N D N D N D N D N D N D N D <br /> I� Spike Conc. <br /> Added: 10 10 10 20 10 10 10 <br /> Conc. Matrix <br /> Spike: 87 91 89 17 11 10 10 <br /> I <br /> Matrix Spike <br /> % Recovery: 87 91 89 85 110 100 100 <br /> Conc. Matrix <br /> I Spike Dup.. 92 99 96 18 11 10 10 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 92 99 96 90 110 100 100 <br /> I Relative <br /> % Difference: 56 84 76 57 00 00 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> I <br />. SE�l1UlA ANALYTICA %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Giles (Conc ofM + Cone of M SD)/2 <br />' Laboratory Director 3010583 RES t5, <br />