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SEQUOIA ANALYTICAL <br /> 1900 Batu Avenue • Suite LM • Concord,California 94520 <br /> (510)686-9066 FAX(510)686.9689 <br /> Kaprealian Engineering,Inc. Client Project ID:Unocal#6015,Lodi,601 E.Kellleman Lane <br /> P.O.Box 996 <br /> Benicia,CA 94510 <br /> Attention: Mardo Kaprealian,P.E. CC Sample Group: 1081620-68 Reponed: Sep 19, 1991 <br /> QUALITY CONTROL DATA REPORT <br /> SURROGATE <br /> EPA EPA EPA EPA EPA EPA EPA <br /> Melhod: 8015/8020 8015/8020 8015/8020 8015/8020 8015/8020 8015/8020 8015/6020 <br /> Analyst: J.Fontecha J.Fontecha J.Fontecha J.Fontecha J.Fontecha J.Fonsecha .1.Fentecha <br /> Reporting Units: ppm PPM PPM Ppm PPM PPM PPM <br /> Date Analyzed: Sep 8. 1991 Seo 8, 1991 Sep 8, 1991 Sep 8, 1991 Sep 8, 1991 Sep B. 1991 Sep B, 1991 <br /> Sample#: 109.1627 109-1628 109.1629 109.1630 109.1631 109.1632 1031633 <br /> Surrogate <br /> %Recovery: 110 92 120 110 100 100 100 <br /> SEQUOIA ANALYTICAL `%Recavery: Conc.of M.S.-Conc.of Sample x 100 <br /> Spike Conc.Added <br /> Relative%Diflerence: Conc.of M.S.-Conc.of M.S.Q. X100 <br /> Belinda C.Vega / (Conc.of M.S,+Conc.of M.S.O.I/Z <br /> Laboratory Director 10B1620.KEI <11> <br />