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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX (415) 364-9233 <br /> Waterwork Client Project ID BJJ Trucking, Stockton <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention Nora Kataoka QC Sample Group 0062516-0062521 Reported Jul 6, 1990 <br /> ' QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Tnchloro- Chloro Lead <br /> ethene ethene ethene <br /> Method EPA 8010 EPA 8010 EPA 8010 SPA 7421 <br /> Analyst J Fontecha J Fontecha J Fontecha R Sharma <br /> ' Reporting Units pg/kg pg/kg pg/kg mg/L <br /> Date Analyzed Jun 26, 1990 Jun 26, 1990 Jun 26, 1990 Jun 28, 1990 <br /> QC Sample# 006-3505 006-3505 006-3505 006-3666 <br /> ' Sample Cone N D N D N D N D <br /> Spike Cone. <br /> Added 25 25 25 010 <br /> ' Conc Matrix <br /> Spike 28 24 24 Oil <br /> Matrix Spike <br /> % Recovery: 110 96 96 110 <br /> ' Conc Matrix <br /> Spike Dup - 28 25 25 0 1 i <br /> ' Matrix Spike <br /> Duplicate <br /> ' % Recovery: 110 100 100 110 <br /> Relative <br /> ' % Difference 00 41 41 00 <br /> ME <br /> QUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> �e/lat,,e%Difference Conc of M S -Cone of M S D x 100 <br /> I abeth W Hackl (Conc of M S + Conc of M S D J/2 <br /> P oject Manager 62518 WAT <5> <br />