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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921 0100 <br /> i <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 QC Sample Group 2060099-119 Reported Jun 17, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 6020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed Jun 15, 1992 Jun 15 1992 Jun 15 1992 Jun 15, 1992 <br /> QC Sample # BLK061592 BLK061592 BLK061592 BLK061592 <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 018 019 019 039 <br /> Matrix Spike <br /> % Recovery* 90 95 95 98 <br /> Conc. Matrix <br /> Spike Dup 018 019 019 040 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 90 95 95 100 <br /> Relative <br /> % Difference 0 0 00 0 0 25 <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 /> Relative%Difference Conc of M S -Cone of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> i <br /> 2060099 RES <4> <br />