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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 • FAX (415) 364-9233 <br /> ' iRESNA Client Protect ID W0475 13,Wever Pant �, <br /> „1710 Main Street <br /> Escalon, CA 95320 ` <br /> <Attention Tina La Page QC Sample Group 207-0118 x ro Reported: Jul 8, 1992 <br /> 1 ,.. ry t. +ro+.+mn ~},v .,.rw 4>h.ry me w��-u.ry. ..Ar h rrrrn,..,r x .�.. rr .. + ry�. rvr.�w ,.r ryry Yerrn�+r.`ia�t� r�{�'.vw.�ryr 4{v..�Y+•.'.tin <br /> m+-4hv.. 4 + {` n�ct �x~trryr it�x" ��t \ rFrc N� M14AC4�Rpfro s.{v rr�vWwvrrrr..vrAC4�'m+�nnrr-�xN7+row+ <br /> QUALITY CONTROL DATA REPORT <br /> ' ANALYTE E"- <br /> Benzene Toluene benzene Xylenes <br /> ' Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst M Nipp M Nipp M Nipp M Nipp <br /> Reporting Units pg/L ug/L Ng/L pg/L <br /> ' Date Analyzed Jul 2, 1992 Jul 2, 1992 Jul 2, 1992 Jul 2, 1992 <br /> QC Sample# GBLK070292 GBLK070292 GBLK070292 GBLK070292 <br /> MS/MSD MS/MSD MS/MSD MS/MSD <br /> ' Sample Conc : N D N D N D N D <br /> Spike Conc. <br /> Added- 10 10 10 30 <br /> ' Conc. Matriu <br /> Spike: 94 96 95 28 <br /> ' Matrix Spike <br /> %Recovery: 94 96 95 93 <br /> ' Conc. Matrix <br /> Spike Dup.: 10 10 10 30 <br /> ' <br /> Matrix Spike <br /> Duplicate <br /> %Recovery 100 100 100 100 <br /> ' Relative <br /> %Difference- 62 41 51 69 <br /> 1 <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative%Dfferenoe Conc of M S -Conc of M S D X 100 <br /> is Lee (Conc of M S + Conc of M S D) 2 <br /> roject Manager 2070118 WAT <2> <br /> 1 <br />