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j 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#2076, Lodi <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick QC Sample Group 1110758-67 <br /> Reported Dec 2, 1991 <br /> h y <br /> I� <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 A.Maralit A.Maralit A Maralit A Maralit <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Nov 27, 1991 Nov 27 1991 Nov 27, 1991 Nov 27, 1991 <br /> CC Sample # GBLK112791 GBLK112791 GBLK112791 GBLK112791 <br /> Sample Conc N D N D N D N D <br /> Spike Conc <br /> Added 020 020 020 060 <br /> Conc Matrix <br /> Spike 020 019 019 056 <br /> i <br /> Matrix Spike <br /> % Recovery 100 95 95 93 <br /> Conc Matrix <br /> Spike Dup 020 019 019 055 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 100 95 95 92 <br /> Relative <br /> % Difference 00 00 00 1 8 <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 /> •/J � Spike Conc Added <br /> Y/M• Relative%Difference Conc of M S -Conc of M S D x 100 <br /> Rick R DlMaio (Conc of M S + Conc of MSD)/2 <br /> Project Manager 1110758 RES <2> <br />