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SEQuoiA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX (415) 364-9233 <br /> "FiESNA �� vuh4�uWh..cW'J�AOF4AGF�W.'4.ev'iS&.{....n va4 <br /> pient Project ID W0475,Weber Point z <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> ' `Attention Tina Le Page n x ry QC Sample Group 2050926-7 Y V w_ y WVyJ++_m A H Reported May 8, 3992 - <br /> y i� n vv v � <br /> vi }v vYAmv�iWh�hi.+,Y�i4 <br /> tQUALITY CONTROL DATA REPORT <br /> ' ANALYTE Ethyl- <br /> Benzene Toluene benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst L Larkhtman L Laikhtman L Laikhtman L Laikhtman <br /> Reporting Units pg/L Erg/L yg/L lrg/L <br /> Date Analyzed May 7, 1992 May 7, 1992 May 7, 1992 May 7, 1992 <br /> OC Sample# BLK050792 BLK050792 BLK050792 BLK050792 <br /> ' Sample Cone : N D N D N D N D <br /> Spike Conc. <br /> Added: 10 10 10 30 <br /> ' Conc. Matrix <br /> Spike: 98 98 98 30 <br /> ' Matrix Spike <br /> %Recovery. 98 98 98 100 <br /> ' Conc. Matrix <br /> Spike Dup.: 10 10 97 30 <br /> ' Matrix Spike <br /> Duplicate <br /> %Recovery: 100 100 97 100 <br /> ' Relative <br /> ' % Difference: 20 20 10 00 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> a i�A 1 � Relative%Dqfference Conc of M S -Conc of M S D x 100 <br /> s ee (Conc of M S + Conc of M S D) 2 <br /> olect Manager 2050926 WAT <3> <br />