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SEQUOIA ANALYTICAL <br /> 680 Chesapeake D eRedwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364.9233 <br /> •r�^+n�o-x^'.w, n vy. +tx>..:..+:°'.a++'r't+�.>r Y`'s +cac+.t.tr a�+�^an�rr^-�rsu e.,mywyxx,•Hvv+ u�wyHraxvasm+vn ank++wrc...vn,.,r,o,..ws+...r^t r+.�vA'r+<n ,.* <br /> ` xr+.r , ..ri^.,G�h�.wr a s r Y`.c.•nv`r.e��`,S$i37d�a;'xrf n�xh rh•.s'°:,'�WN-:,'d�.rx4`+kruaa�" �hS:�..w.',,.}ice-s`c'na,.,.:.}`,,:r a,+.ua d,ho-w SSw<+ac...w,c,,..ar ., <br /> Delta Environmental Consultants Client Project ID #40-88-146 01, Shell,Stockton <br /> ' 3330 Data Drive <br /> Rancho Cordova, CA 95670 <br /> Attention Jim Brownell QC Sample Group 0080940-945 Reported Aug 15, 1990 <br /> QUALITY CONTROL DATA REPORT <br /> ANA Lead <br /> Method EPA 7421 <br /> ' Analyst R Sharma <br /> Reporting Units mg/kg <br /> Date Analyzed Aug 8, 19W <br /> OC Sample# 008-rias <br /> 1 <br /> Sample Cone.: 84 <br /> e <br /> Spike Cone. <br /> Added: 50 <br /> ' Conc. Matrix <br /> Spike: 56 <br /> Matnx Spike <br /> ' %Recovery 95 <br /> Conc. Matrix <br /> ' Spike Dup.- 55 <br /> Matrix Spike <br /> ' Duplicate <br /> %Recovery: 93 <br /> ' Relative <br /> %Difference 1 8 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> ' Spike Conc Added <br /> Relative%Difference Conc of M S -Cone of MSD x 100 <br /> ' Vickie Tague (Conc of nn s + Conc of M s D)/2 <br /> Project Manager BOW DLT <4, <br />