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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> 40 (916) 921-9600 • FAX (916) 921-0100 <br /> RESNA Industries Client Project ID Arco #6100, Tracy <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek CC Sample Group 206-0098 Reported Jun 8, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Jun 8, 1992 Jun 8, 1992 Jun 8, 1992 Jun 8, 1992 <br /> QC Sample # BLK060892 BLKOSM92 BLK060892 BLK060892 <br /> Sample Conc.. N D N D N D N D <br /> • Spike Cone <br /> Added 020 020 020 040 <br /> Cone Matrix <br /> Spike: 017 018 018 035 <br /> Matrix Spike <br /> % Recovery 85 90 90 88 <br /> Cone Matrix <br /> Spike Dup 020 018 018 038 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery- 100 90 90 95 <br /> Relative <br /> % Difference 16 00 00 82 <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 /> {r J �'• 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 /> 2060098 RES 42> <br />