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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue - Suite LM - Concord,California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> .............. ..... <br /> ........... ...................... <br /> "Client Project 11): Unocal,601 E. Kettleman Ln., Lodi <br /> Kaprealian Engineering, Inc. <br /> P.O. Box 996 <br /> ..Benicia, CA 94510 <br /> :'Attention: Mardo Kaprealian, P . QC Sample Group: Reported: Jan 10. 1992 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> EPA EPA EPA <br /> Method: 8015/8020 8015/8020 8015/8020 <br /> Analyst: J.F. J.F. J.F. <br /> Reporting Units: ug/L ug/L ug/L <br /> Date Analyzed: Jan 6, 1992 Jan 6, 1992 Jan 6, 1992 <br /> Sample 201-0091 201-0092 Blank <br /> Surrogate <br /> % Recovery: 92 91 92 <br /> SEQUOIA ANALYTICAL %Recovery: Cone.of M.S.-Conc.of Sample x 10D <br /> Spike Conc.Added <br /> Relative%Difference: Cone.of M.S.-Cone.of M.S.D. X 100 <br /> Belinda C. Vega (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> Laboratory Director <br /> 2010084.KEI <4> <br />