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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 v} v } <br /> 723 S St Method (units) EPA 624 (ug/L purged) Q C Sample Dates <br /> Sacramento, CA 95814 Analyst(s) M Nguyen <br /> Attention Steve Misner QC Sample # BLK011993 Analyzed Jan 19, 1993 <br /> Reported Jan 26, 1993 <br /> v ,n fi 4 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Conc. Matrix Spike <br /> Conc Spike Matrix Duplicate Relative <br /> Sample Spike Conc Matrix % Spike % % <br /> Analyte Conc. Added Spike Recovery Duplicate Recovery Difference <br /> 1,1-Dichloro- ND 50 64 128 60 120 68 <br /> ethene <br /> Trichloroethene ND 50 52 104 50 100 35 <br /> Benzene ND 50 53 106 52 104 1 5 <br /> Toluene ND 50 53 106 53 106 1 1 <br /> Chlorobenzene ND 50 53 106 53 106 0 0 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> paw 1"4'4�7 <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 3010283 BRS <8> <br />