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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (916) 921 9600 o FAX (916) 921 0100 <br /> Alton Geoscience Client Project ID #42-0012-00, 1604 South 8 St <br /> 3035 Prospect Park Dr, Suite 80 <br /> Rancho Cordova CA 95670 <br /> Attention Matthew Taylor OC Sample Group 2030521-35 Reported Apr 1, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene `(rlenes Diesel <br /> BPA <br /> Method EPA 8020 EPA 8020 EPA 6020 EPA 8020 8015 Mod <br /> Analyst C Chapman C Chapman C Chapman C Chapman M Giles <br /> Reporting Units ppm ppm ppm ppm ppm <br /> Date Analyzed Mar 31 1992 Mar 31 .992 Mar 31 1992 Mar 31 1992 Mar 31 1992 <br /> QC Sample # 2030521 203 0521 203 0521 2030521 21-K033092 <br /> Sample Conc N D N D N D N D N D <br /> Spike Conc <br /> Added 02 02 02 04 10 <br /> Conc Matrix <br /> Spike 0 16 0 16 0 16 0 34 8 4 <br /> Matrix Spike <br /> % Recovery 80 80 80 85 84 <br /> Conic Matrix <br /> Spike Dup 0 15 0 16 0 16 032 82 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 75 80 80 80 82 <br /> Relative <br /> % Difference 6 4 0 0 0 0 6 1 2 4 <br /> SEQUOIA ANAL Y—;[CAL Recovery Conc of M S Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative °o Difference Conc of f 1 S Conc of M S D x 100 <br /> Michael R Giles (Conc of M S r Conc of M S D ) /2 <br /> Laboratory Director <br /> 2030521 ALR <6> <br />