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h <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 - Sacramento, CA 95834 <br /> WAWW (916) 921-9600 - FAX (916) 921-0100 <br /> I <br /> RI=SNA Industries Client Project ID Arco #2076, Lodi <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick QC Sample Group 111-0697 Reported Dec 4, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br />� STLC Lead <br /> Method EPA 6010 <br /> Analyst M Chiaravalloti <br /> Reporting Units mg/L <br /> Date Analyzed Dec 4, 1991 <br /> QC Sample # 111-0725 <br /> Sample Conc N D <br /> iSpike Conc <br /> Added- 50 <br /> Conc Matrix <br /> Spike 50 <br /> Matrix Spike <br /> % Recovery 100 <br /> r Conc Matrix <br /> Spike Dup : 49 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 98 <br /> Relative <br /> % Difference 20 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br />• <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S Cono of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S Conc of M S D x 100 <br /> Rlck R DiMalo (Conc of M S + Conc of M S D) /2 <br /> PA1110697 RES <2> <br /> Project Manager <br />