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SEQUOIA ANALYTICAL <br /> VAR,�j� 660 Chesapeake Drive - Redwood City, CA 84063 <br /> '•'` (415) 364-9600 FAX(415)364.9233 <br /> i <br /> yi <br /> Waterwork Client Project In20195 1,Western Stone Products <br /> ' 1710 Main Street <br /> `.Escalon,CA 95320 <br /> At«Ρentlon RW Ju ca1 QC Sample Group: o <br /> - „ f rt <br /> � 's5;#kc.,»..Fi, ,k.:< .,,.....:.... ,.... .:: .... .. .,r � .. .:....M.. ,...... .` <br /> r Reported: <br /> ed Nov 10 1989 <br /> w- QUALITY CONTROL DATA REPORT <br /> loyz <br /> NALY7E Benzene <br /> Toluene Ethyl Xylenes <br /> A h <br /> Benzene =# <br /> ' Method: EPA 8015 EPA 8015 EPA 8015 EPA 8015 <br /> Analyst: GS/JD GS/JC GS/JD GS/JD ' <br /> t` Reporting Units: mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed: Lvov 3. 1989 Nov 3, 1989 Nov 3, 1989 Nov 3, 1999 <br /> QC Sample#: 911-0068 911-0068 911-0068 911-0068 <br /> €i <br /> Sample Cone.. N.D. <br /> N.D. N.D. N.D. <br /> i <br /> Spike Conc. r <br /> t i Added: 1.0 1.0 1.0 3.0 fi <br /> y [�` Conc.Matrix <br /> Spike: 0.43 0.74 0.84 2.5 <br /> Matrix Spike <br /> W %Recovery: 43 74 84 83 t <br /> Conc..Matrix <br /> ,pike Dup.; 0.45 0.77 086 2.5 <br /> Y <br /> 'S e6 Matrix Spike <br /> Duplicate s <br /> >: <br /> %recovery: 45 77 86 83 <br /> ;3 <br /> Relative <br /> 1' %Difference. 4.6 4.0 2.4 0 <br /> I <br /> SEQUUi r AN LYTi AL %Recovery: Cono.of M.S.-Cone,of Sample x too E <br /> Spike Conc.Added <br /> U y/ Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> "w' hi A. j rkman icane.of M.S. + Cone.of M.S.D.)/2 <br /> �r�ect Manager 9105ag8,WAT <a> <br />