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SEQUOIA ANALYTICAL <br /> City,680 Drive - Redwood CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> JiESNA �CAient ProjectID�W0475'13,'Weber Point <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention Tina Le Page CC SampleGroup2070941-2 hxN At 4 m Reported Jul 13, 1992 <br /> ' QUALITY CONTROL DATA REPORT <br /> ' ANALYTE Ethyl- <br /> Benzene Toluene benzene Xylenes <br /> ' Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst M Nipp M Nipp M Nipp M Nipp <br /> Reporting Units jug/L jvs/L ag/L pg/L <br /> ' Date Analyzed Jul 8, 1992 Jul 8, 1992 Jul 8, 1992 Jul 8, 1992 <br /> QC Sample# GBLK070892 GBLK070892 GBLK070892 GBLK070892 <br /> MS/MSD MS/MSD MS/MSD MS/MSD <br /> ' Sample Conc: N D N D N D N D <br /> Spike Conc <br /> Added: 10 10 10 30 <br /> ' Conc Matrix <br /> Spike 10 10 10 30 <br /> ' Matrix Spike <br /> %Recovery- 100 100 100 100 <br /> ' Conc. Matrix <br /> Spike Dup.: 10 10 10 31 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 100 100 100 103 <br /> ' Relative <br /> % Difference: 00 00 00 33 <br /> !,SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Relative 6 Difference Spike <br /> pike Canc Added <br /> g Ce—� Cone x 100ofMS -Conc ofMSD <br /> a s ee (Conc of M S + Conc of M S D) 2 <br /> rolect Manager 2070941 WAT <2> <br />