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f� <br /> i <br /> 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 10 Arco X2130 Stockton <br /> 3164 Gold Camp Drive, Suite 200 <br /> Rancho Cordova, CA 95670 <br /> Attention Eloise Frick OC Sample Group 1120436-44 Reported Dec 26, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE E n,i <br /> Benzene Tniuene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Analyst C Chapman C Chapman C Chapman C Chapman S Foster <br /> Reporting Units ppm ppm ppm ppm mg/kg <br /> Date Analyzed Dec 19 1991 Dec 19 1991 Dec 19 1991 Dec 19 1991 Dec 26 1991 <br /> QC Sample # BLK121991 ELK121991 BLK121991 BLK121991 1120488 <br /> Sample Conc N D N D N D N D N D <br /> Spike Conc <br /> Added 0 2 0 2 0 2 0 4 50 <br /> Conc Matrix <br /> Spike 018 0 19 0 19 039 43 <br /> Matrix Spike <br /> % Recovery 90 95 95 98 86 <br /> Conic Matrix <br /> Spike Dup 019 0 2 0 2 042 42 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 95 100 100 110 84 <br /> Relative <br /> % Difference 5 4 5 1 5 1 7 4 2 4 <br /> SEQUOIA ANALYTICAL % Recovery Conc of M S Conc cf Sample x 100 <br /> "'C Spike Cenc Added/��� <br /> L Relative Difference Conc of M S -Conc of M S D x 100 <br /> Michael R Giles L (Conc of M S + Conc of M S D) / 2 <br /> Laboratory Director 1120436 RES <4> <br />