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SEQUOIA ANALYTICAL <br /> ICAL <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 Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> ' Method EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J Dinsay J Dinsay J Dmsay J Dinsay <br /> ' Reporting Emits mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Jun 29, 1990 Jun 29 1990 .tun 29, 1990 ,tun 29, 1990 <br /> OC Sample # 006-4181 006-4181 006-4181 006-4181 <br /> Sample Conc.. N D N D N D N D <br /> i Spike Cone. <br /> ! Added 020 020 020 060 <br /> Conc Matrix <br /> Spike 018 018 019 054 <br /> ' Matrix Spike <br /> % Recovery 90 90 95 90 <br /> ' Conc Matrix <br /> Spike Dup 018 019 018 054 <br /> ' Matrix Spike <br /> Duplicate <br /> ' % Recovery 90 90 90 90 <br /> Relative <br /> ' % Difference 00 54 54 00 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> i <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> izabeth W Hackl (Conc of M S + Conc of M S D)/2 <br /> roject Manager 62516WAT <4> <br />