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` SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> r�.f'm�^•�fYR+'�arrF .£•,3rvovr�r.+• m-m^^-r,�.^^^�•xrf��"7^�+m-'u'�^^v,.>sror-.rr.^^�,.rC�"'s,,,,"'.fm�-," ,,,.r..r-,r.,...,,r, ...y�un <br /> fW rr ��li%AF•CfH��� NN�r �•0%'YAGY � v s.W..:Aywr-+7srrr w..-:.tv'JC`wrs-Wxrw/��m�rrwmvrrmk�w+.:w+�erj�m mr.+r rvfii�vYrvLwr��rmn.�L.+RWr+2 <br /> 7Groundwater Technology Client Project iD Lam �od Distract <br /> 4057 Port Chicago Hwy. <br /> ;Concord.CA 94520 <br /> Attention: Dave iaeesattel OC Sample Group: 1 7-91 _r . ter. Re ed: Oct 19f 1992 <br /> '. <br /> rou_2100 $ �.,..,..�,, ..n,,. .�..< Pa.�..�.;rf,�r <br /> rr.9. 'n45.� <br /> ,� +��Y�}')y1'vl]"r"• �+N. Y a4'mr+rl3wXHnrLG4.LsvS?+✓+03`.000dSS4xv�+WL <br /> .wv.rn..wNxrrr-'}'x 4r."x/f'rr +!/NxJfw4llfl�ixr frr+r+M <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE - <br /> Benzene Toluene Edhylbenzene Xylenes <br /> Method- EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravalloti Chiaravallots Chiaravalloti Chiaravalloti <br /> Reporting Units- jVg/L pg/t- ps/L ug/L <br /> Date Analyzed Oct 15, 1982 Oct 15, 1992 Oct 15, 1992 Oct 1S, 1992 <br /> QC Sample#. 210-0176 210-0176 21()-0176 210.0176 <br /> Sample Conc.: N D N D N D N D <br /> 0 Spike Conc. <br /> ^ Added. 10 10 10 20 <br /> Conc. Matrix <br /> Spike: 80 84 84 17 <br /> Matrix Spike <br /> % Recovery: 80 84 84 85 <br /> Conc Matrix <br /> Spike Dup.. 83 87 88 18 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 83 87 88 90 <br /> Relative <br /> % Difference: 37 35 47 57 <br /> P <br /> EQUOIA ANAL CAL %Recovery Conc of M S •Conc of Sample x 100 <br /> Spice Conc Added <br /> Relative%Difference Conc of M S -Cone of MSD x 100 <br /> Michael R Giles (Conc of M S + cont of M S D)/2 <br /> Laboratory Director <br /> 2100187 GRC <2> <br />