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Ft <br /> r9 X <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415)364.9600 FAX(415)364.9233 <br /> Cllent Project 10:W03i79.Gardner Property <br /> homton <br /> Waterwork <br /> `1710 Maln Street <br /> Escalon,CA 95320 Reported. Nov 14 1991 <br /> ;Attention: John Lane <br /> OC Sample Group: 1105549-52 <br /> QUALITY CONTROL DATA REPORT <br /> Ethyl- <br /> ANALYTE Benzene Toiueno Benzene Xvienes <br /> EPA 13020 EPA 8020 EPA 8020 <br /> Method: EPA W20 Hatsno R Halsne R.Haisno <br /> Analyst: R HatSA ppb ppb ppb <br /> Reporting UnIts: ppb Nov 10, 1991 Nov 10, 1991 Nov 10, 1991 <br /> Date Analyzed: Nov 10, t99t Matrix Blank Matrix Blank Matrix Biank <br /> OC Sample#: Mat&Blank <br /> Sample Conc.: N.D. <br /> N.D. N.D. N.D. <br /> Spike Conc. 0.20 0.20 0.20 0.60 <br /> Added: <br /> ! Conc.Matrix 21 18 16 50 <br /> Spike: <br /> Matrix Spike 105 90 80 83 <br /> °,b Recovery: <br /> Conc.Matrix 19 16 49 <br /> Spike Dup.: 21 <br /> Matrix Spike <br /> Duplicate 90 80 82 <br /> %Recovery: 105 <br /> Relative 0.0 0.0 2.0 <br /> °,6 Difference: 0.0 <br /> %�coVery: Done.of M.S.-Conc,of S nnpla x 100 <br /> SEQUOIA ANALYTICAL Spike Conc.Added <br /> Relative%Difference: Conc.of M.S..Conc.of M.S.D. <br /> x 100 <br /> (Conc.of M.S.+ Conc.of M.S.D.) 2 t i5d9.WAT r3> <br /> is l_ <br /> oject Manager <br />