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z. SEQUOIA ANALYTICAL Nov o 2 02 <br /> 1900 Bates Avenue + Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> Alfon Ceosclence 611ent Project lD. -0136-10 <br /> 5870 Stoneridge Drive, Suite 6 <br /> Pleasanton,CA 94588 <br /> Attention: Stephan Rosen OC Sample Group: 2100722-730 Reported: Oct 9, 1992 <br /> .4. - ., - ,,..:-...,...::;::: :.,-,. - ....-...�:i:ac�:;ct:..fvna..?c•.....r.� ii'':> .. a�.,.i <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Eth�A- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> EPA EPA EPA EPA <br /> Method: 8015/802o 8015/8020 8015/8020 aoi5/a02D EPAS015 <br /> Analyst: A.T. A.T. A.T. A.T. KVAmer <br /> Reporting Units: pg/L Ng/L PG/L Pg/L P9/L <br /> Date Analyzed: Oat 23, 1992 Oct 23, 1992 Oct 23, 1992 Oat 23, 1992 Oct 28, 1992 <br /> OC 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 Cone. <br /> Added: 20 20 20 60 300 <br /> Conc. Matrix <br /> Spike: 20 20 21 66 28 <br /> Matrix Spike <br /> %Recovery: 100 100 105 110 93 <br /> Conc.Matrix <br /> Spike Dup.: 20 21 21 66 294 <br /> Matrix Spike <br /> Duplicate <br /> %Recovery: 100 105 105 110 98 <br /> Relative <br /> %Difference: 0.0 4.9 0.0 OA 4.9 <br /> ouaiity Assurance Statement All standard operating procedures and quality control requirements have been met. <br /> SEQUOIA ANALYTICAL Cone.01 M.S. .0i Sample x 100 <br /> ike 0ow.Added <br /> Relative%Difference: COW.of M.S.-Cone.of M.SA. x 100 <br /> A. O .of M.S. + .of M.&D.)/2 <br /> Project Manager 2100722.ALT <5> <br />