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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br />� x r '' <br /> Watefworlc Client Project ID: W0475,Weber Point <br /> -`!h1710 Main Street <br /> Escalon, CA 95320 <br /> Attention Tina IAe_Page OC Sample Group 2040283 Reported- r 8. 1992 F <br /> w . x Yzr wiz css��� .ff t t s ter. " 44 N.� r f maw . �c �¢xiysy �vwtsl Gxa <br /> ;rsty',:.o-..w�aa`.cc„�sviws,�w'cc '°�� 2.40.EGA,Gac�caJ`,rl�lri� cw,co,�.::.So-iwS.s.Sacr :a..?i '"f,.oc;.anv-.r�T.sn;aca�aatus�r.:oeciw.`sK,4Lcr�%R' `t�a`�x-.�..avaac �'r' <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Eth* <br /> Benzene Toluene benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA S= <br /> Analyst, M Mipp M.Mpp M Hupp M Mipp <br /> Reporting Units. pg/L Yg/L {rg/L pg/L <br /> Date Analyzed Apr 2. 1992 Apr 2. 1992 Apr 2, 1992 Apr 2, 1992 <br /> QC Sample#. Gs=4=2 GBLKD40292 GSLK040292 GBLK040292 <br /> MS/MSD MS/MSD MS/MSD MS/MSD <br /> Sample Cone.: N D N.D N D N D <br /> Spike Cone. <br /> Added: 10 10 10 30 <br /> Cone. Matrix <br /> Spike: 10 10 10 30 <br /> Matrix Spike <br /> % Recovery: 100 100 100 100 <br /> Cone. Matrix <br /> Spike Dup.: 99 10 9.8 30 - <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 99 100 98 100 <br /> Relative <br /> % Difference: 10 00 20 00 <br /> SEQUOIA ANALYTICAL %Recovery Cone of M S -Cone of Sample _ x 100 <br /> Spike Cone Added <br /> Reiative%Difference Cone of M S •Cone of M S D X 100 <br /> e (Cone of M S + Conc of M S.D} 2 <br /> roject Manager 204CM WAT <4> <br />