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SEQUOIA ANALYTICAL <br /> I 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> /II (510) 686-9600 FAX (510) 686-9689 <br /> MPDS Services, Inc. Client Project ID:.Unocal 0788, 8203 E. 11th$t.,Tracy <br /> 2401 Stanwell Dr., Ste. 400 = <br /> Concord, CA 94520 <br /> Attention: Avo Avedissian QC Sample Group: 4021110-16 Reported: Mar 7, 1994; <br /> f <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> Method: EPA 8015 EPA 8015 EPA 8015 EPA 8015 EPA 8015 EPA 8015 EPA 8015 <br /> } Analyst: K.Wimer K.Wimer K.Wimer K.Wimer K.Wimer K.Wimer K.Wimer <br /> 1 Reporting Units: ug/L N9/L N9/L N9/L N9/L u9/L p9/L <br /> Date Analyzed: , 3/1/94 3/1/94 3/1/94 3/1/94 3/1/94 3/1/94 3/1/94 <br /> Sample #: 402-1110 402-1111 402-1112 402-1113 402-1114 402-1115 402-1116 <br /> I, <br /> i <br /> 1 Surrogate <br /> % Recovery: 115 82 100 115 112 108 112 <br /> SEQUOIA ANALYTICAL %Recovery: Cone.of M.S.-Conc.of Sample x 100 <br /> Spike Conc.Added <br /> Relative%Difference: Conc.of M.S.-Cone.of M.S.D. x 100 <br /> Ke p (Conc.of M.S. + Conc.of M.S.D.)/2 <br /> Project Manage <br /> a. 4021110.MPD <7> <br />