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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> (510) 6B6-9600 • FAX (510) 686-9689 <br /> ms <br /> -Xaprealian Engineering, Inc. Client Project ID: Unocal, 601 E. Kettleman Ln., Lodi <br /> P.O. 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 EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst: S.L. S.L. S.L. S.L. S.L. S.L. S.L. <br /> Reporting Units.- ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> Date Analyzed: Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 Jan 2, 1992 <br /> Sample#: 112-0953 112-0954 112-0955 112-D956 112-0957 112-0958 112-0959 <br /> Surrogate#1 <br /> %Recovery: 95 93 92 87 110 87 110 <br /> Surrogate#2 <br /> % Recovery: 89 95 96 95 93 94 92 <br /> 0 SEQUOIA ANALYTICAL %Recovery: Conc,of M.S.-Conc.of Sample X 100 <br /> Spike Conc.Added <br /> �C- Relative%Difference: Conc.of M.S.•Conc.of M.S.D. X 100 <br /> Belinda C. Vega (Cont.of M.S. + Cone.of M.S.D.)/2 <br /> Laboratory Director 1120953.KEI <17> <br />