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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 Client Project ID Manteca Bean <br /> 1401 Halyard Drive, Suite 140 <br /> West Sacramento, CA 95691 <br /> Attention Scott Gable CC Sample Group 2080379-90 N y y Reported Sep 1, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> Analyst Chiaravallott Chiaravallot3 Chiaravailoti Chiaravalloti <br /> Reporting Units ppb ppb ppb ppb <br /> Date Analyzed Aug 31, 1992 Aug 31, 1992 Aug 31, 1992 Aug 31 1992 <br /> w' oC Sample# 208.0387 2080387 208-0387 208-0387 <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 96 10 10 19 <br /> Matrix Spike <br /> % Recovery- 96 100 100 95 <br /> Conc Matrix <br /> Spike Dup - 99 11 11 19 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 99 110 110 95 <br /> Relative <br /> % Difference: 3 1 95 95 00 <br /> . SEQUOIA ANALYTICAL %Recovery Conc of M S Conc of Sample x 100 <br /> Spike Canc Added <br /> Relative%Difference Conc of M S Conc of M S D x 100 <br /> Michael R Giles {Conc of M S + Conc of M S D f /2 <br /> Laboratory Director <br /> 2080379 GRW <3> <br />