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r <br /> ` SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921 9600 FAX (916) 921-0100 <br /> i <br /> I <br /> RESNA Industries Client Project ID Arco #2130, Stockton <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Greg Altiman QC Sample Group 2120116-17 Reported Dec 15, 1992 <br /> I <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> I ANALYTE <br /> 1 Benzene Toluene Ethylbenzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravalloti Chiaravalloti Chiaravalloti Chiaravalloti <br /> Reporting Units ug/L vg/L pg/L yg/L <br /> Date Analyzed Dec 9, 1992 Dec 9, 1992 Dec 9 1992 Dec 9, 1992 <br /> 1 OC Sample# 212.0083 212-0083 212-0083 212.0063 <br /> Sample Conc N D N D N D N D <br /> I Spike Conc. <br /> r Added: 10 10 10 20 <br /> Conc. Matrix <br /> Spike 90 92 94 19 <br /> 1 ' <br /> 1 <br /> Matrix Spice <br /> % Recovery 90 92 94 95 <br /> 1 Conc Matrix <br /> 1 Spike Dup.. 93 96 97 20 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 93 96 97 100 <br /> 1 <br /> Relative <br /> % Difference: 33 43 3 1 5 1 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> 1 <br /> r# SEQUOIA ANALYTICAL %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 of M S + Conc of M S D) /2 <br /> Laboratory Director <br /> I 2120116 RES <3> <br />