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E SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 * FAX(415) 364-9233 <br /> w 4 Mx� <br /> !Eimcon'As- soctates Client Project ID 4445 Pershing,Ave, Stockton, Shell) rr N N <br /> 1433 N Market Blvd Method (units) EPA 624(µg/L purged) O C.Sample Dates <br /> Sacramento, CA 95834 Analyst(s) M Williams <br /> Attention. Sheila Kruse QC 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- N D 50 58 116 58 116 00 <br /> ethene <br /> Trichloroethene N D 50 51 102 50 102 20 <br /> EBenzene N D 50 53 106 53 106 00 <br /> Toluene ND 50 51 102 51 102 00 <br /> EChlorobenzene ND 50 53 106 53 106 00 <br /> I <br /> E <br /> E <br /> E <br /> E <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Cane of Sample x 100 <br /> Spike Conc Added <br /> Retawe%Difference Cone of M S •Cane.of M S C x 100 <br /> f Made A. Springer (Conc of M S + Conc of M S D)/2 <br /> Project Manager _ 2012M EEE <10n <br /> E <br />