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i <br /> SEQUOIA ANAlY71 CAL <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 /> 1 9 <br /> 1710 Main Street <br /> ' Escalon, CA 95320 <br /> Attention Nora Kataoka OC Sample Group 0062516-0062521 Reported Jul 6, 1990 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTIw 1,1-Dichloro- Tnchloro- Chloro- Lead <br /> ethene ethene ethene <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 7421 <br /> Analyst J Fontecha J Fontecha J Fontecha R Sharma <br /> ' Reporting Units Mg/kg pg/kg u9/kg mg/L <br /> Date Analyzed Jun 26, 1990 Jun 26, 1990 Jun 26, 1990 Jun 28, 1990 <br /> OC Sample # 006-3505 006-3505 006-3505 006-3666 <br /> ' Sample Conc N D N D N D N D <br /> i Spike Conc <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 211 25 25 Oil <br /> iMatrix Spike <br /> Duplicate <br /> % Recovery 110 100 100 110 <br /> Relative <br /> 1 % Difference 00 41 41 00 <br /> I <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample z 100 <br /> Spike Conc Added <br /> iatwe%Difference Conc of M S Conc of M S D x 100 <br /> I abeth W Hackl (Conc of M S + Conc of M S D)/2 <br /> olect Manager <br /> 62516 WAT <5> <br />