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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue * Suite LM * Concord,California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Kaprealian Engineering, Inc. Client Project ID: Unocal,601 E.Kettleman, Lodi <br /> 2401 Stanwell Drive, Suite 400 <br /> Concord, CA 94520 <br /> Attention: Mardo Kapreal ian, P.E. OC Sampi e Group: 2040292-300 Reported: Apr 22, 1992 <br /> xx X <br /> ......................... ........I.-....... ....................... .... ............ <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method: 8015/8020 8015/8020 $015/8020 8015/8020 <br /> Analyst: K.N. K.N. K.N. K.N. <br /> Reporting Units: u0/t- ug/L ug/I- ug/l_ <br /> Date Analyzed: Apr 15, 1992 Apr 15, 1992 Apr 15, 1992 Apr 15, 1992 <br /> OC Sample#: Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 20 20 20 60 <br /> Conc. Matrix <br /> Spike: 18 17 19 57 <br /> Matrix Spike <br /> %Recovery: 90 85 95 95 <br /> Conc. Matrix <br /> Spike Dup.: 17 17 19 55 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 85 85 95 92 <br /> Relative <br /> %Difference: 5.7 0.0 0.0 3.6 <br /> Laboratory blank contained the following analytes: None Detected <br /> *SEQUOIA ANALYTICAL %Recovery- Cone.of M.S.- nc.of Sample x 100 <br /> Spike Cone.Added <br /> Relative%Difference: Cone.of M.S.-Cone.of M.S.D. x 100 <br /> Belinda C. Vega (Cone.of M.S. + Cone.of M_.Z_D_.TT2_ <br /> Laboratory Director 2040292. 1 <2> <br />