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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 o Sacramento CA 95834 <br /> (916) 921 9600 o FAX (916) 921 0100 <br /> Alton Geoscience Cilent Project ID #42-0012-00, Cal Trans <br /> 3035 Prospect Park Dr , Suite 80 <br /> Rancho Cordova, CA 95670 <br /> Attention Matthew Taylor CC Sample Group 2040131-33 Reported Apr 14 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xvlenes 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 Gies <br /> Reporting Units ppb ppb Ppb ppb ppb <br /> Date Analyzed Apr 13 1992 Apr 13 1992 Apr 13 1992 nor 13 1992 Apr 13 1992 <br /> OC Sample # 2LK041392 BLKC41392 BLK041392 5LK041392 BLK041392 <br /> Sample Conc N D N D N D N D N D <br /> Spike Conc <br /> Added 10 10 10 20 600 <br /> Conc Matrix <br /> Spike 8 2 8 9 8 5 16 540 <br /> Matrix Spike <br /> % Recovery 82 89 85 80 90 <br /> Conc Matrix <br /> Spike Dup 9 6 9 8 9 3 18 580 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 96 98 93 90 97 <br /> Relative <br /> % Difference 16 9 6 9 5 9 7 1 <br /> . SEOUOIA ANALYTICAL °o 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 /> 2040131 ALS <4> <br />