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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 - Sacramento CA 95834 <br /> (916) 921-9600 - FAX (916) 921-0100 <br /> 1 <br /> RESNA Industries Client Project ID Arco #6020, Manteca h <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jay Johnson OC Sample Group 211-0478 Reported Nov 30, 1992 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> 1 pH Flashpoint <br /> Method EPA 9045 EPA 1010 <br /> Analyst Y Arteaga K Follett <br /> Reporting Units pH units °C <br /> l Date Analyzed Nov 24, 1992 Nov 24 1992 <br /> OC Sample # 211-3920 211-1517 <br /> Sample Conc.. 22 >100 <br />. Spike Conc <br /> Added: N/A N/A <br /> Conc. Matrix <br /> Spike N/A N/A <br /> Matrix Spike <br /> % Recovery N/A N/A <br /> Sample Dup 22 >100 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery N/A N/A <br /> Relative <br /> % Difference 00 00 <br />. SEQUOIA ANALYTI L %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of MS -Cone cf M S D x 100 <br /> Michael R Giles (Conc of MS + Conc of M S D) /2 <br /> Laboratory Director <br /> 2110478 RES c6> <br />