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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 c Sacramento, CA 95834 <br /> W41 W <br /> (916) 921 9600 o FAX (916) 921-0100 <br /> Alton Geoscience Client Project ID #42 0014 Cal Trans <br /> 3035 Prospect Park Dr , Suite 80 <br /> Rancho Cordova CA 95670 <br /> Attention Matthew Taylor OC Sample Group 2040009-20 Reported Apr 6, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA <br /> Method EPA 8920 EPA 8020 EPA 8020 EPA 8020 8015 Mod <br /> Analyst C Chapman C Chapman C Chapman C Cnapman Chiaravailott <br /> Reporting Units ppm ppm ppm ppm ppm <br /> Date Analyzed Apr 6 1992 Apr 6 1992 Apr 6 4992 Apr 5 1992 Apr 7 1992 <br /> OC Sample # BLK040692 BLK040692 BLK040692 BLK040692 BLK040692 <br /> Sample Conc N D N D N D N D N D <br /> Spike Conc <br /> Added 02 02 02 04 15 <br /> i <br /> Conc Matrix <br /> Spike 0 16 0 16 0 16 0 33 13 <br /> Matrix Spike <br /> % Recovery 80 80 80 82 87 <br /> Conc Matrix <br /> Spike Dup 0 17 0 18 0 17 036 13 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 85 90 85 90 87 <br /> Relative <br /> % Difference 61 12 6 1 87 00 <br /> SEQUOIA ANALYTICAL Recovery Conc of Ni S Conc of Sample x 100 <br /> 1 Spike Cenc Added <br /> f Cis ��"Lu L, Relative io 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 /> 2040009 ALR <6> <br />