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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> .. .! a ..�,. - <br /> nt I�1 r {v X�;v X. <br /> }W <br /> a e o k Cslent Project ID W0475,Weber Point <br /> {1710 Main Street <br /> } <br /> Ascalon, CA 95320 y t t y nx J J <br /> ' Tina Tina Le Page QC Sample Group 2040283-4 Reported Apr 8 1992 <br /> i J J'j n4 3 Y � ixri�v♦ f�s r rS\t �<'tvn <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 Mpp M Nipp M Nipp <br /> ' Reporting Units Ng/L pg/L Mg/L }rg/L <br /> Date Analyzed Apr 2, 1992 Apr 2, 1992 Apr 2, 1992 Apr 2, 1992 <br /> QC Sample# GBLK040292 GBLK040292 GBLK040292 GBLK040292 <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. Matrilt <br /> Spike: 10 10 10 30 <br /> ' Matrix Spike <br /> % Recovery: 100 100 100 100 <br /> ' Conc. Matrix <br /> Spike Dup.: 99 10 98 30 <br /> ' Matrix Spike <br /> Duplicate <br /> % Recovery 99 100 98 100 <br /> 1 <br /> Relative <br /> ' % Difference 10 00 20 00 <br /> SEQUOIA ANALYTICAL %Recovery Cane of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Difference Conc of M S -Conc of M S D x 100 <br /> n L e (Conc of M S + Conc of M S D) 2 <br /> rolect Manager 2040283 WAT <4> <br /> 1 <br />