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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA Industries Client Project ID Arco #6020, Manteca <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 /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- STLC <br /> Benzene Toluene Benzene Xylenes Lead Cyanide Sulfide <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 EPA 9010 EPA 9030 <br /> Analyst Chiaravalloti Chiaravalioti Chiaravalloti Chiaravallob D Ballard A.Sawa K Follett <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg mg/L mg/kg mg/kg <br /> Date Analyzed Nov 24 1992 Nov 24, 1992 Nov 24 1992 Nov 24, 1992 Nov 25 1992 Nov 23 1992 Nov 24, 1992 <br /> CC Sample # 211-0351 211-0351 211-0351 211-0351 211-0478 211-3227 2112646 <br /> Sample Conc. N D N D N D N D N D N D N D <br /> Spike Conc. <br /> Added- 020 020 020 0 40 2 0 10 1300 <br /> Conc. Matrix <br /> Spike 016 017 017 0 34 21 10 1500 <br /> Matrix Spike <br /> % Recovery- 80 85 85 85 105 100 115 <br /> Conc. Matrix <br /> Spike Dup. 017 018 018 037 2 0 98 1400 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 85 90 90 93 100 98 108 <br /> Relative <br /> % Difference 61 57 57 85 49 2 0 69 <br /> iSEQUOIA ANALYTICAL %Recovery Conc of M S -Cone of Sample x 100 <br /> Spike Conc Added I <br /> Cy / <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Gres (Conc of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> 2110478 RES <5> <br />