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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 9210100 <br /> RESNA Industries Client Project ID Arco #2130, Stockton <br /> 3164 Gold Camp Dr, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Jay Johnson OC Sample Group 208-0448 Reported Aug 31, 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 Aug 28 1992 Aug 28, 1992 Aug 28 1992 Aug 28 1992 <br /> OC Sample # SLK082892 BLK082892 BLK082892 BLK082892 <br /> Sample Cone N D N D N D N D <br /> Spike Cone. <br /> Added: 020 020 020 040 <br /> Cone. Matrix <br /> Spike: 020 021 022 040 <br /> Matrix Spike <br /> % Recovery* 100 105 110 100 <br /> Cone. Matrix <br /> Spike Dup ' 019 020 020 037 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 95 100 100 92 <br /> Relative <br /> % Difference 51 49 95 78 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA ANALYTI L %Recovery Cone of M S -Cone of Sample x 100 <br /> �/' q r Spike Conc Added <br /> "`�-���?/ Relative%Difference Cone of M S -Cone of M S D x 100 <br /> Michael R Giles (Cone of M S + Conc of M S D)/2 <br /> Laboratory Director <br /> 2080448 RES <2> <br />