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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 ndustnes� uv .,. Client Project ID Arco#6100,Tracy <br /> 13164 Gold Camp Dr., Suite 200 <br /> Rancho Cordova.CA 95670 <br /> (Attention David Stavarek QC Sample Groin 2120464-5 Reported Dec 16, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTI= <br /> Benzene Toluene Ethyibenzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravailoti Chiaravalloti Chiaravalloti Chiaravailoti <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Dec 15, 1992 Dec 15 1992 Dec 15 1992 Dec 15, 1992 <br /> OC Sample # BLK121592 BLK121592 BLK1121592 BLK121592 <br /> Sample Conc. N D N D N D N D <br /> Spike Conc. <br /> Added: 020 020 020 040 <br /> Conc.Matrm <br /> Spike 017 018 018 034 <br /> Matrix Spike <br /> % Recovery: 85 90 90 85 <br /> Conc. Matrix <br /> Spike Dup.: 018 018 018 035 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 90 90 90 88 <br /> Relative <br /> % Difference- 57 00 00 29 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTI AL % 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 /> 2120464A.RES <2> <br />