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SEQUOIA ANALYTICAL <br /> 1900 Sates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 SEP 0 8 1992 <br /> titan Geosclencs' ' ,v „ Cllertt Project ID' lUiobd'#04-NP4/r30-040-10 V AVY i�' � "" ` `}A """" " ^ <br /> 5870 Stonendge Drive, Suite 6 <br /> Pleasanton, CA 94588 <br /> Attention Cyril Yong OC Sample Group 208-0980 Reported Aug 31, 1992 <br /> r ^ r w . +•nr ri ,. •v '. v v v l•s r.h .. n ry ,nnn W. i n i .' r.rlrv.w r.r.r J <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA EPA EPA EPA <br /> Method 8015/8020 8015/8020 8015/8020 8015/8020 EPAS015 <br /> Analyst A.P kP A.P AP KWlmer <br /> Reporting Units erg/L frg/L pg/L ug/L yg/L <br /> Date Analyzed Aug 28, 1992 Aug 28, 1992 Aug 28, 1992 Aug 28, 1992 Aug 31, 1992 <br /> OC Sample# Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc N D N D N D N D N D <br /> Spike Conc. <br /> • Added: 20 20 20 60 300 <br /> Conc. Matrix <br /> Spike: 20 20 20 62 319 <br /> Matrix Spike <br /> %Recovery: 100 100 100 103 106 <br /> Conc. Matrix <br /> Spike Dup.: 20 20 20 62 308 <br /> Matrbx Spike <br /> Duplicate <br /> % Recovery: 100 100 100 100 103 <br /> Relative <br /> % Difference. 00 00 00 00 35 <br /> WQUOIA ANALYTICAL %RecoveryCone of M S -Conc of Sample x 100 <br /> Spike Cone Added <br /> Relatrve%Diffemnoe Conc of M S,-Conti,of M S D x 100 <br /> C A Chleff0 Conc of M + Cone of M S D)/2 <br /> Project Manager <br /> 2080980.ALT 3> <br />