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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite S • Sacramento CA 95834 <br /> (916) 921-9600 FAX (916) 921-0100 v v <br /> RESNA industries Client Project ID Arco#2168, Stockton <br /> 3164 Gold Camp Dr. Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Cherven QC Sample Group 205-0324 Reported May 20, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethyl benzene Toluene <br /> Method EPA 8020 EPA 8024 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ppm ppm ppm ppm <br /> Date Analyzed May 19, 1992 May 19, 1992 May 19, 1992 May 19, 1992 <br /> QC Sample # BLK051992 BLK051992 ELK051992 BLK051992 <br /> Sample Cone.: N D N D N D N D <br /> . Spike Cone. <br /> Added. 02 02 02 04 <br /> Cone. Matrix <br /> Spike: 017 018 018 036 <br /> Matnx Spike <br /> % Recovery: 85 90 90 90 <br /> Cone. Matrix <br /> Spike Dup.: 017 018 018 037 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 85 90 90 92 <br /> Relative <br /> %Difference: 00 00 00 27 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA <br /> ANALYTI L %Recovery Conc of M S -Cane of Sample x 100 <br /> Spike Cone 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)12 <br /> Laboratory Director <br /> 2050324 RES <2> <br />