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SEQUOh4NALYTIG -- <br /> AL , <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415) 364-9600 FAX(416)364-9233 I' <br /> Y J <br /> 1Y11Vaterwoflc Client Project ID: Eckholm . <br /> 1710. Main Street <br /> fEscalon,CA 95320 <br /> Attention: 801 Channelf QC Sam a Gro : 1043731-3741 Reported: May 6, 1991 <br /> I � <br /> f <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE E <br /> Benzene Totuene Benzene X ones <br /> Method: EPA 8020 EPA SM EPA 80¢0 EPA 8020 <br /> Analyst: G.Mayer G.Meyer G.Meyer G.Mayer <br /> Reporting Units: ng ng n ng <br /> Date Analyzed: Apr 25. 1991 Apr 25. 1991 Apr 25. 1991 Apr 25. 1991 <br /> CC Sample#: GBLK 042591 GBLK 042591 GBLK 042591 GBLK 042591 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> �i <br /> Spike Cone. <br /> Added: 100 100 100 300 <br /> Conc. Matrix <br /> Spike: 92 94 94 280 <br /> Matrix Spike <br /> %Recovery: 92 94 94 93 <br /> Conc. Matrix <br /> Spike Dup.: 93 100 100 300 <br /> Matrix Spike i <br /> Duplicate <br /> %Recovery: 93 100. 100 100 <br /> Relative <br /> %Difference: 1.t 6.2 6.2 6.9 <br /> SE L101A ANALYTICAL %Fkmxwry: Conc.of M.S.-Conc.of Sample x 100 <br /> } Spiko Cone.Added <br /> ' t � PolatNe%Difference: Conc.of M.S.-Conc,of M.S.D. x 100 <br /> i ah8I W. HaC Conc.of M.S. + Conc.of M.S.D.) 2 <br /> P Ject Manager 1043731.WAT c5> <br /> i <br />