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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX (415) 364-9233 <br /> Emcon Associates Client Project ID 4445 Pershing,Ave, Stockton, Shell r <br />' 1433 N Market Blvd Method (units) EPA 624 (ug/L purged) 0 C Sample Dates <br /> Sacramento, CA 95834 Analyst(s) M Williams <br /> Attention Sheila Kruse OC Sample # BLK012992 Analyzed Jan 29, 1992 <br /> Reported Jan 30, 1992 <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 58 116 58 116 00 <br /> ethene <br /> Trichloroethene ND 50 51 102 50 102 20 <br /> Benzene N D 50 53 106 53 106 00 <br /> Toluene ND 50 51 102 51 102 00 <br /> Chiorobenzene ND 50 53 106 53 106 0 0 <br /> i <br /> 1 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample X100 <br /> r Spike Conc Added <br /> !� � ; Relative%Difference Conc of MS -Cone of M S D X100 <br /> MaiI e A Springer �� (Conc of M S + Conc of M S D)/2 <br /> Project Manager J 2012775 EEE <10> <br />