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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 e Sacramento CA 95834 <br /> (916) 921 9600 o FAX (916) 921 0100 <br /> Alton Geoscience Client Project ID #42 0014-00 1603 So B St Stockton <br /> 3035 Prospect Park Dr , Suite 80 <br /> Rancho Cordova, CA 95670 <br /> Attention Matthew Taylor QC Sample Group 203 0594 Reported Apr 3, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> S <br /> ANALYTE Ethy: <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 8015 Mod <br /> Analyst C Chapman C Chapman C Chapman C Chapman M Gites <br /> Reporting Units ppm ppm ppm ppm ppm <br /> Date Analyzed Mar 31, 1992 Mar 31 1992 Mar 31 1992 Mar 31 1992 Apr 2 1992 <br /> QC Sample <# 2030521 2030521 2030521 203-0521 SLK040292 <br /> Sample Cone N D N D N D N D N D <br /> Spike Cone <br /> Added 0 2 0 2 0 2 0 4 15 <br /> Conc Matrix <br /> Spike 016 0 16 0 16 034 16 <br /> Matrix Spike <br /> % Recovery 80 80 80 85 107 <br /> Conc Matrix <br /> Spike Dup 0 15 0 16 016 032 17 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 75 80 80 80 113 <br /> Relative <br /> % Difference 64 0 0 0 0 61 6 1 <br /> SEQUOIA ANALYTICAL % Recovery Conc of M S Conc of Sample x 100 <br /> Spike Conc 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} /2 <br /> Laboratory Director <br /> 2030594 ALR <3> <br />