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-SEQUOIA ANALYTICAL <br /> W) 1900 Bates Avenue • Suite LM • Concord,California 94520 <br /> (510)686-9600 FAX (510) 686-9689 <br /> :.: ton Geosclence :.:: ......:..: .. <br /> Client 611 d ID: Mobil*04=343%30-0136-10 <br /> 5870 Stonerldge Drive, Suite 6 <br /> Pleasanton, CA 94588 <br /> Attention: Stephan RosenOC Sample Group: 2070734-742 <br /> Reported: Jul 28, 1992 <br /> QUALITY CONTROL DATA REPORT <br /> ANAL Ethyl- <br /> Benzene Toluene Benzene Xylene$ rNesel <br /> EPA EPA EPA EPA <br /> Method: 81115/8020 8015/8020 8015/8420 8015/6020 EPAS015 <br /> Analyst: A.P. AP. A-P. A.P. KWimer <br /> Reporting Units: pg/L Pq/L PDX Pg/L Ne/L <br /> Date Analyzed: Jul 23, 1992 Jul 23, 1992 Jul 23, 1992 Jul 23, 1992 Jul 27, 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 /> Cone.Matrix <br /> Spike: 20 20 20 62 248 <br /> Matrix Spike <br /> % Recovery: 100 100 100 103 83 <br /> Cone. Matrix <br /> Spike Dup.: 20 20 20 62 253 <br /> MatrtK Spike <br /> Duplicate <br /> %Recovery: 100 100 100 103 84 <br /> Relative <br /> %Difference: 0.0 0.0 0.0 0.0 2.0 <br /> OSEQUOLA-ANALYTICAL i DerrConc.of Sarnple x 100 <br /> Spike cow.Mded <br /> Relatta%DEtrerence: Conc.of M.S.-Cone.of M.S.D. x 100 <br /> A.ChleffO (Cone.cf M. . t Cuic.of M. .D. 2 <br /> project Manager <br />