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j SEQUOIA ANALYTICAL <br /> 0 Bates Avenue Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Protect neenng of NNCalif V Client Project ID #209/60 E i 0th St. Tracy <br /> X2821 Whipple Road Method (units) EPA 8010 (ug/L purged) Q C Sample Dates ' <br /> Union City, CA 94587 Analyst(s) M Nguyen <br /> -,Attention John Mrakovich CC Sample# SIM 12291 Analyzed Nov 22, 1991 v <br /> Reported Dec 3, 1991 v <br /> �� 3�V�'�O MviWr'^J�r vxN14r rxJti arr v xrye.} hxk}✓rr vr.rxv tin r } • +tiN r <br /> QUALITY 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 10 13 130 13 130 00 <br /> ethane <br /> Tnchloroethene N D 10 97 97 10 100 30 <br /> Benzene N D 10 10 100 10 100 0 0 <br /> Ane N D 10 9 3 93 92 92 1 1 <br /> Chlorobenzene N D 10 99 99 91 91 84 <br /> S FManaoger <br /> L %Recovery Conc of M S -Cone of Sample x 100 <br /> Spike Conc Added <br /> Relative%OIfference Conc of M S -Conc of M so x 100 <br /> Ulla (Cant of M S + Cont of M s 5)/z <br /> roll <br /> 1110814 TP1= a 11> <br />