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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 #760, Lodi <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention David Stavarek QC Sample Group 2070644-50 Reported Aug 11, 1992 <br /> i <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 8015 Mod <br /> Analyst C Chapman C Chapman C Chapman C Chapman Chiaravailob <br /> Reporting Units Ppm ppm ppm ppm ppm <br /> Date Analyzed Aug 10, 1992 Aug 10, 1992 Aug 10 1992 Aug 10, 1992 Aug 10, 1992 <br /> QC Sample # BLK081092 BLK081092 BLK081092 BLK081092 BLK081092 <br /> Sample Conc N D N D N D N D N D <br /> Spike Conc. <br /> Added: 020 020 020 040 15 <br /> Conc Matrix <br /> Spike 019 019 019 036 14 <br /> Matrix Spike <br /> % Recovery 95 95 95 90 93 <br /> Conc. Matrix <br /> Spike Dup 019 020 020 038 v 14 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery _ 95 100 100 95 93 - - <br /> Relative <br /> % Difference: 00 51 51 54 00 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTICAL % Recovery Cone of M S -Conc of Sample x 100 <br /> V���, Spike Conc Added <br /> Relative%Difference Conc of MS -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 /> 2070644 RES <3> <br />