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SEQUOIA ANALYTICAL <br /> -�� 819 Striker Avenue, Suite 8 - Sacramento, CA 95834 <br /> (916) 921-9600 - FAX (916) 921-0100 <br /> Groundwater Technology Gient Protect!D #02:i2014G&,Garden Grain 229 M,olfat.Manteca CA <br /> 4080 Pike Lane <br /> Concord, CA 94,520 <br /> Attention: Chns Desoao QC Sample Group 2090217-18 Reported Sep 17, 1992 <br /> N..� ... .-f.. v ... „ v .I 3r r t. .i ,,. . ,.. ,. Al.u. ...,. r2'r.vu�•llFN'*L ..,...if.W'!liVi4AY 4NAY <br /> i <br /> QUALITY CONTROL DATA REPORT <br /> k <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravalloti Chtaravallott Chiaravalioti Chiaravalloti <br /> Reporting Units ppb ppb ppb Ppb <br /> 'f Date Analyzed Sep 16 1992 Sep 16, 1992 Sep 16 1992 Sep 16, 1992 <br /> ( QC Sample 209-0154 209-0154 209-0154 209-0154 <br />: t <br /> . r <br />.r-f <br />'£ Sample Conc N D N D N D N D <br /> Spike Conc <br /> Added 10 10 10 20 <br /> Conc Matrix <br /> Spike 84 8 7 8 7 18 <br /> Matrix Spike <br /> % Recovery 84 87 87 90 <br /> Conc Matrix <br /> Spike Dup - 87 91 91 18 <br /> Matrix Spike <br /> Duplicate <br /> r %Recovery 87 91 91 90 <br /> Relative <br /> % Difference 35 45 45 0 0 <br /> i <br /> SEQUOIA ANALYTICAL %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> Relative;Difference Conc of M S -Canc of M S C x 100 <br /> Michael R Giles (Conc of M 6 + Conc of M S 0}/2 <br /> Laboratory Director <br /> 2090217 GGG <2> <br />