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SEQUOIA i6mAALYTICAL <br /> 1900 Sates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> ,29Protect Engineering of N'Canf' Client Project ID #209/ 60 E 'Ct" St , Tracy v <br /> 1 Whipple Road oad Method (units) EPA 8010 (pg/L purged) D C Sample Dates { <br /> Union Clty, CA 94587 Analyst(s) M Nguyen <br /> Attention John Mrakovich QC Sample # 81k112391 Analyzed Nov 23, 1991 <br /> vy{r M {f+r r rev,. ra r Reported Dec 3, 1991 <br /> vv!.t++.vrv,mLx3?.Ww wi.:x4m hf r vv x w • r YiVrryx r n v r v. r p <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 /> 1,1-Dichloro- N D 10 13 130 12 120 80 <br /> ethene <br /> Trichloroethene N D 10 12 120 12 120 00 <br /> Benzene N D 10 11 110 11 110 00 <br /> akene N D 10 11 110 10 100 00 <br /> Chlorobenzene N D 10 12 120 11 110 8 7 <br /> QIA ANA YTI L %Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> 4ative%Difference Conc of M S -Conc of M S D x 100 <br /> ;Pro <br /> Male Stein (Conc of M S + Conc of M S D)/2 <br /> ct Manager <br /> 1110814 TPE <12> <br />