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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 9219600 * FAX (916) 921-0100 <br /> eM':�,w <br /> ,.u��G`i.,.�,JS{a+� ^4C�r�".+ +�«uo- ..L..\.iw„tiw .wA.M.%cwk'cdal{at-i�.�6ci •c++• <br /> EMCON Associates Client Project ID Shell,620 W Charter Way, Stockton <br /> 1433 N Market BMd <br /> Sacramento, CA 95834 <br /> Attention Jim Pella OC Sample Group 2100275-84 Reported Oct 22, 1992 <br /> ` u .. ` .vYnt�ty✓� if+TF.cc� . <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene t22benxem X <br /> Method EPA 602 EPA 602 EPA 602 EPA 802 <br /> Analyst Chiaravalft ChAtavalbe ChianwWl ae Chwavallod <br /> Reporting Unfts NG/L lg/L ►w/L W/L <br /> Date Analyzed Oct 20, 19x2 Oct 20, 1992 Oct 20, 1992 Oct 20, 1992 <br /> OC Sample# 2104= 210-OM 2104= 210-0282 <br /> Sample Conc.: ND N D N D N D <br /> Spike Conc. <br /> Added: 10 10 10 20 <br /> Conc. Matrix <br /> S pilo: 86 89 90 is <br /> Matrix Spike <br /> % Recovery 86 89 90 90 <br /> Conc. Matrix <br /> Spike Dup.. 89 93 93 19 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 89 93 93 95 <br /> Relative <br /> % Difference: 34 44 33 54 <br /> SEQUOIA ANALYTI AL %Recovery, Cone of M S -Cone of Sample x 100 <br /> Spike Cana Added <br /> *J&664� Reiative%Difference Conc of MS -Cone of M S D x 100 <br /> Michael R Giles (Conc of M S + Conc or M S D) 2 <br /> Laboratory Director <br /> 210027533dC a3> <br />