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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> lop (916) 921-9600 • FAX (916) 921-0100 <br /> Brown &Caldwell Client Project 10 Arco#2133, Stockton <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Misner OC Sample Group 212-0812 Reported Jan 7, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl. <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Reporting Units ug/L ug/L ug/L ug/L <br /> Date Analyzed Dec 31, 1992 Deo 31, 1992 Dec 31, 1992 Dec 31, 1992 <br /> OC Sample # 212-0738 212-0738 212-0738 212-0738 <br /> Sample Conc . N D N D N D N D <br /> Spike Conc. <br /> Added 10 10 10 20 <br /> Conc. Matrix <br /> Spike 86 89 93 18 <br /> Matrix Spike <br /> % Recovery: 86 89 93 90 <br /> Conc. Matrix <br /> Spike Dup.. 89 92 95 19 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 89 92 95 95 <br /> Relative <br /> % Difference: 34 33 21 54 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Canc Added <br /> Relative%Difference Conc of M S -Cone of MSD x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D)7 2 <br /> Laboratory Director 2120812 BRS <2> <br />