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SEQUOIA(ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> ::V:n:.:nvtr::::.iw.:..::.i}}:.:h. :...:v ... ... .. .......nn... .n. .. .. .......:...v. <br /> Engineering fence&Tech. Client EA-92-1 `Arc' <br /> o #548/Stockton <br /> 41-A Lafayette Circle Method: EPA 8270 C.C. Sample Dates -=* <br /> Lafayette, CA 94549 Analyst(s): N.F. Extracted: Mar 27, 1992 <br /> j>Attention: Brian Thomas CC Sample#: Matrix Blank Analyzed: Mar 30, 1992 <br /> Reported::.Apr.l3,` 1992 <br /> ,Sx!o:y::-}}.:.>^.;.r:v.:v:}•:.:.y;:.:x.}v.}.:n•...,:.....:......:.::.,::::::.,-.,..::n„:x....:,:::.:.,...,....n. :......:........: ..:..:.: ....:......,........v..--.:. <br /> i' <br /> ...:.::....:...w.:.:.x..,......:..x:.r..n:.-r.n,.::..r.:'vc2::'c':`!:.....:......:-....Y:.:.:.:.,,.,,.,.,..,....,.:.....:..:v...:.:.,.....:........:.....:..:.:n.........:.....:.....v............,.:.,.,..,.,r:.:.:....:..,........A.....,.......rvr.r.............:_.:.vn,...x.......,.. <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Conc. Matrix Spike <br /> Conc. Spike Matrix Duplicate Relative <br /> Sample Spike Conc, Matrix % Spike % % <br /> ' Analyte Conc. Added Spike Recovery Duplicate Recovery Difference <br /> Phenol N.D. 100 64 64 67 67 4.6 <br /> 2-Chlorophenol N.D. 100 116 116 120 120 3.4 <br /> '1,4-Dichloro- N.D. 50 34 68 39 78 14 <br /> On7esne <br /> itroo-Di-N- N.D. 50 40 80 42 84 4.9 <br /> propylamine <br /> `1,2,4 Trichloro- N.D. 50 31 62 35 70 12 <br /> benzene <br /> �4-Chloro- N.D. 100 62 62 66 66 6.3 <br /> 3-Methylphenol <br /> Acenaphthene N.D. 50 24 48 22 44 8.7 <br /> 4-Narophenol N.D- 100 96 96 97 97 1.0 <br /> I, <br /> 2,4-Dinitro- N.D. 50 46 92 44 88 4.4 <br /> ' toluene <br /> Pentachlaro- N.D. 100 121 121 125 125 3.3 <br /> phenol <br /> Pyrene N.D. 50 51 102 53 106 3.8 <br /> �UOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample 'x 100 <br /> ' Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> c hieflo (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> Project Manager 2031136.EEE <12> <br />