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SEQUOIA'I ►NALYTICAL <br /> 1900 Bates Avenue * Suite LM * Concord,California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> ............ <br /> ....... ::>::>::>>::>::>: ;;:::..... <br /> . ......... <br /> ...Kaprealian Engineering, Inc. CAient Project ID: Unocal,2835 Navy Drive, Stockton <br /> '.'.'P.O. Box 996 <br /> CA 94510 <br /> "'Attention: Mardo Kapreallan, P.E. QC Sample Group: 204-1276 Reported: May 8, 1992 <br /> ...... ... ........ <br /> .......... <br /> . .. ............ ...... ... ................ ....... . <br /> ............. ............................ ........ .. .. . .......................... ... ............................... ............ <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA EPA EPA EPA <br /> Method: 8015/8020 8015/8020 8015/8020 8015/8020 EPA8015 <br /> Analyst: K.N. K.N. K.N. K.N. A Tuzon <br /> Reporting Units: ug/L ug/L ug/L ug/L ug/L <br /> Date Analyzed: May 1, 1992 May 1, 1992 May 1, 1992 May 1, 1992 May 4, 1992 <br /> QC Sample#: Matrix Blank Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D. <br /> Spike Conc. <br /> Added: 20 20 20 60 300 <br /> Conc. Matrix <br /> Spike: 18 18 19 56 284 <br /> Matrix Spike <br /> %Recovery: 90 90 95 93 95 <br /> Conc. Matrix <br /> Spike Dup.: 19 19 20 57 262 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 95 95 100 95 87 <br /> Relative <br /> %Difference: 5.4 5.4 5.1 1.8 8.1 <br /> Laboratory blank contained the following analytes: None Detected <br /> SEQUOIA ANALYTICAL %Recovery: Cone.ofU6—nc—o—f�mple x 100 <br /> Spike Cone.Added <br /> Relative%Difference: Cone.of M.S.-Cone.of M.S.D. x 100 <br /> Scott A. hieff o (Cone.of M.S. + Cone.of M. .D. /2 <br /> Project Manager 2D41276.KEI <3> <br />