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SEQUOIA(ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> .::.:.,:.r.,M.: . :.: .. ...... . ..�.:.,:.,:...:::..,.-:.:.::::.r::.,.,...,:.v.,..:.�...::::..:::::r::::.::........,-.r:.rN.:v.,�:::A,:..:.r:.:rr:..:..:<..�..:M:;..}.{:,..}:x.M,�r.;:.r.>.m,:n..,:...:.r:rs::r:..•::-}}:•:;:::::::::,..<;:::<.:.:..v<.},:..::.:,,,�,: <br /> ..n.........,r.Ct:.:i:n.s..�n::}i.}isv:;.::::.•F4::C":.............I.-................:.........:........ - - .... r <br /> -. •....... .. } ...... .... ...:.:.... :v.:v.-ri.t4S:.J vW::4:in liv4 riv4vii<i�..r <br /> 4.:v:,t-:v}}::......ii}':ttr:ir(v':i.tt:..}�.........{:•:ti'vtv.v:rrrnw.V.w::..:... ...:.....:. <br /> }. .v.n r '.'n n n vttwrn vsr?;.::.env::4riiii-:i-}}:?•};:i.:v}:-}:.>:-:v}:-r.:i.:ii}}}:{w:.v::.: ...........:::..:4.:.:. <br /> Engineering Science&Tech. Client Project ID: EA-92-1/Arco#548/Stockton <br /> 41-A Lafayette Circle Method (units): EPA 8240 (pg/L purged) Q.C. Sample Dates <br /> €Lafayette, CA 94549 Analyst(s): G.Meyer <br /> f4[ <br /> ;Attention: Brian Thomas CC Sample#: Matrix Blank Analyzed: Apr 1, 1992 <br /> Re <br /> arced: A r 3 1992- <br /> QUALITY <br /> 992QUALITY CONTROL DATA REPORT <br /> Matrix Cone. Matrix Spike <br /> Cone. Spike Matrix Duplicate Relative <br /> Sample Spike Cone. Matrix % Spike % % - <br /> Analyte Cone. Added Spike Recovery Duplicate Recovery Difference <br /> 1,1-Dichloro- N.D. 50 50 100 49 98 2.0 <br /> ethene <br /> Trichloroethene N.D. 50 50 100 47 94 6.2 <br /> Benzene N.D. 50 51 102 49 98 <br /> 4.0 <br /> Rluene N.D. 50 52 104 50 100 3.9 <br /> iChlorobenzene N.D. 50 52 104 50 100 3.9 <br /> '1 <br /> 1 <br /> �1 <br /> 41.11011A ANALYTICAL 96 Recovery: Cone.of M.S.-Cone.of Sample x 100 <br /> ' Spike Cone.Added <br /> Relative%Difference: Cone.of M.S.-Conc.of M.S.D. x 100 <br /> tt A Chieffo (Conc.of M.S. + Conc.of M.S.D.) 2 <br /> Project Manager 2031136.EEE <11> <br />