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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento CA 95834 <br /> Iwo (916) 921-9600 • FAX (916) 921 0100 <br /> RESNA Industries Client Project ID Arco #6020, Manteca <br /> 3164 Gold Camp Or, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jay Johnson QC Sample Group 211-0477 Reported Nov 30, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Elhyldenzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravalloli Chiaravailoti Chiaravalloti Chiaravailoti <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Nov 24 1992 Nov 24, 1992 Nov 24 1992 Nov 24 1992 <br /> QC Sample # 211.0351 211-0351 211-0351 211-0351 <br /> Sample Conc N D N D N D N D <br /> Spike Conc <br /> Added: 020 020 020 040 <br /> Conc Matrix <br /> Spike: 016 017 017 034 <br /> Matrix Spike <br /> % Recovery 80 85 85 85 <br /> Conc Matrix <br /> Spike Dup 017 018 018 037 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 85 90 90 93 <br /> Relative <br /> % Difference 61 57 57 85 <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 /> Spike Conc Added <br /> ✓�� ` ' '/ vim 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 /> 2110477 RES <2> <br />