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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue P Suite LM 9 Concord,California 94520 <br /> (510) 6186-9600 FAX (510) 686-9689 <br /> .... ........... <br /> .......... <br /> Kaprealian Engineering, Inc. Client Project ID: Unocal, 601 E. Kettleman Ln., Lodi <br /> P.O. <br /> Box 996 <br /> :::Benicia, CA 94510 <br /> :.:Attention: Mardo Kaprealian, P.E. OC Sample Group: 1120953-60 Reported: Jan 13, 1992 <br /> ............ <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method: EPA 8010 EPA 8010 <br /> Analyst: S.L. S.L. <br /> Reporting Units: ug/kg ug/kg <br /> Date Analyzed: Jan 2, 1992 Jan 2, 1992 <br /> Sample 112-0960 Blank <br /> Surrogate#1 <br /> %Recovery: 110 85 <br /> Surrogate#2 <br /> %Recovery: 92 96 <br /> SEQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Conc.of Sample x 1130 <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Conc.of M.S.D. x 100 <br /> Belinda C. Vega L (Conc.of M.S. + Conc.of M.S,D.)/2 - <br /> Laboratory Director 1120953.KEI <18> <br />