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SEQUO& ANALYTICAL <br /> i <br />' 680 Chesapeake Drive • Redwood City, CA 94063 , <br /> Nor (415) 364-9600 • FAX(415) 364-9233 <br /> t <br /> i <br /> ........:................ :.}:.:.,:..}}ii} <br /> ...:......::..........:.::... ».n..:......v.a...n:::::::. ... ,...vv................. ..............CN.�.::xv....\.......}...p.»y:'.�4.n\\\tlt.:MN:.\....::. <br /> .............................�ni.f:::..:n.:::x.::x.:.a:.::: <br /> �:RESNA }<> >::� .:._>:::»>: <br /> Client Project ID: W0195.00,Western Stone Products%Tracy f <br /> 1710 Main Street <br /> Escalon, CA 95320 <br /> .."Attention: Greg Stahl QC Sample Group: 2101842-50 Reported: Oct 27, 1992 <br /> ......v...::.�a.::::...nn....:.n..... .n,a.. v.. ................... }.5....h.,..0...... vm}}•.ti.m}},y». »w.v w:V:.v �, <br /> :2 <br /> n ...:................}.n..........x}:nJ:.•iiiii ii::�.}}Yi}:N...i 3iii}Yri;C}A.i}}ism:-1::.':.>in4liia"}..nnN}:.'F..:l �V,C\\��.�"'i�i..y.M'yiBT, C3iiJ� <br /> QUALITY CONTROL DATA REPORT <br /> I <br /> ANALYTE Ethyl. <br /> Benzene Toluene benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C.Donohue C.Donahue C.Donahue C.Donohue <br /> Reporting Units: . mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed: Oct 15, 1992 Oct 15, 1992 Oct 15, 1992 Oct 15, 1992 <br /> QC Sample#: GBLK101592 GBLK101592 GBLK101592 GBLK101592 !I <br /> MS/MSD MS/MSD MS/MSD MS/MSD <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Spike Conc. E <br /> Added: 0.20 0.20 0.20 0.60 <br /> Conc. Matrix <br /> Spike: 0.21 0.21 0.21 0.62 <br /> r <br /> Matrix Spike <br /> %Recovery: 105 105 105 105 <br /> Conc. Matrix <br /> Spike Dup.: 0.23 0.23 0.23 0.68 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 115 115 115 113 <br /> Relative <br /> % Difference: 9.1 9.1 9.1 9.2 <br /> I <br /> SEQUOIA ANALYTICAL %Recovery: Cone.of M.S.-Cone.of Sample X100 <br /> Spike Canc.Added <br /> Relative%Difference: Cone.of M.S.-Conc.of M.S.D. X100 1 <br /> a Lee (Cone.of M.S. + Cone.of M.S.D.) 2 <br /> qrcrlect Manager 2101840.WAT <10> <br /> r <br />