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0 <br /> SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue Suite LM - Concord, California 94520 <br /> WWW (510) 686-9600 FAX (510) 686-9689 <br /> -M <br /> R... <br /> Kaprealian Engineering, Inc. Client Project 1b: Unocal/7303 Pacific Ave., Stockton <br /> P.O. Box 996 <br /> ..Benlcia, CA 94510 <br /> .,.Attention: Mardo Kaprealian, P.E. QC Sample Group: 112-1160 Reported: Jan 15, 1992 <br /> ............. . ..... .. .......... ...... ............... <br /> .... .. .. <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method: EPA 8010 EPA 8010 <br /> Analyst: M.N. M.N. <br /> Reporting Units: ug/L ug/L <br /> Date Analyzed: Jan 3, 1992 Jan 3, 1992 <br /> Sample#: 112-1160 Blank <br /> Surrogate#1 <br /> % Recovery: 74 100 <br /> Surrogate#2 <br /> % Recovery: 74 102 <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample X 100 <br /> '?� Spike Conc.Added <br /> k , <br /> 'o Spike <br /> qRelative%Difference: Conc,of M.S.-Conc.of M.S.D. X 100 <br /> Belinda C.Vega (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> Laboratory Director 1121160.KEI <6> <br />