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7 <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 ® Sacramento CA 95834 <br /> (916) 921 9600 o FAX (916) 921 0100 <br /> • <br /> Alton Geoscience Client Project ID ;42 0012 00 1e04 So a Si Stockton <br /> 3035 Prospect Park Dr , Suite 80 <br /> Rancho Cordova CA 95670 <br /> Attention Matthew Taylor CC Sample Group 2030568 75 Reported Apr 2 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE - nn <br /> Benzene Toluene tienzene Xylenes Diesel <br /> EPA <br /> Method EPA 8020 EPA 8020 EPrA 8020 EPA 8020 8015 Mod <br /> Analyst C Chapman C Chapman C Cnaoman C Chapman Vl Giles <br /> Reporting Units ppm ppm ppm ppm ppm <br /> Date Analyzed Apr 1 1992 Apr 1 1992 Apr 1 992 or 1 1992 Apr 2 1992 <br /> QC Sample # 2030568 2030568 2030568 2030568 6LK040292 <br /> Sample Conc N D N D N D N D N D <br /> Spike Conc <br /> Added 02 02 02 04 15 <br /> Conc Matrix <br /> Spike 0 16 0 16 0 16 032 16 <br /> Matrix Spike <br /> % Recovery 80 80 80 80 107 <br /> Conc Matrix <br /> Spike Dup 0 16 0 16 0 16 0 16 17 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 80 80 80 80 113 <br /> Relative <br /> % Difference 0 0 0 0 0 0 0 0 6 1 <br /> ,SEQUOIA ANALYTICAL Recovery Conc or M S Conc of Sample x 100 <br /> Spike Conc Adaea <br /> Relative 1. 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 l /2 <br /> Laboratory Director <br /> 203056BALR <3> <br />