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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> Brown & Caldwell Client Project ID Arco #2133, Stockton <br /> 723 S St <br /> Sacramento, CA 95814 <br /> Attention Steve Misner OC Sample Group 301-0283 Reported Jan 26, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Eth (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 Jan 20 1993 Jan 20 1993 Jan 20, 1993 Jan 20 1993 <br /> QC Sample # 301-0209 301-0209 301-0209 301-0209 <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 95 96 99 20 <br /> Matrix Spike <br /> % Recovery 95 96 99 100 <br /> Conc Matrix <br /> Spike Dup.. 98 98 10 21 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery 98 98 100 105 <br /> Relative <br /> % Difference 31 21 10 49 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> SEQUOIA AAL %Recovery Conc of M S -Conc of Sample x 100 <br />• / //NALYT Spike Conc Added <br /> u/ Relative%Difference Conc of MS -Cone of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc of M S D)/2 <br /> Laboratory Director 3010283$RS <6> <br />