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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue * Suite LM - Concord, California 94520 <br /> (510) 686-9600 - FAX (510) 686-9689 <br /> ........... <br /> ............ <br /> prea an eering, Inc. cli-6-fif Pe6j6df I...W41...Kkil6ffia'...rl­,I�':` <br /> "'2401 Stanwell Drive, Suite 400 <br /> .,..!Concord, CA 94520 <br /> 'Attention: Mardo Kapreallan, P.E. QC Sample Group: 2070385-393 Reported: Jul 21, 1992 <br /> -'x'-x ................1.'.. <br /> ............... <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> EPA EPA EPA EPA <br /> Method: 8015/6020 8015/8020 8015/8020 8015/8020 <br /> Analyst: A.P. A.P. A.P. A.P. <br /> Reporting Units: pg/L yg/L pg/L ;jg/L <br /> Date Analyzed, Jul 15, 1992 Jul 15, 1992 Jul 15, 1992 Jul 15, 1992 <br /> QC Sample-#: Matrix Blank Matrix Blank Matrix Blank Matrix Blank <br /> Sample Cone.: N.D. N.D. N.D. N.D. <br /> Spike Cone. <br /> Added: 20 20 20 60 <br /> Conc. Matrix <br /> Spike: 19 20 20 65 <br /> Matrix Spike <br /> % Recovery: 95 100 100 108 <br /> Cone. Matrix <br /> Spike Dup.: 19 20 20 65 <br /> Matrix Spike <br /> Duplicate <br /> % Recovery: 95 100 100 108 <br /> Relative <br /> % Difference: 0.0 0.0 0.0 0.0 <br /> Laboratory blank contained the following analytes: None Detected <br /> IREQUOIA ANALYTICAL %Recovery: Conc.of M.S.-Cone.of Sample x 100 <br /> Spike Cone.Added <br /> Relative%Difference: Cone.of M.S.-Cone.of M.S.D. x 100 <br /> Ott OA. C hie 4�0 (Cone,of M.S. + Cone.of M.S.D.)/2 2070,Mr).KE; <2> <br /> Project <br />