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4D <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 1900 Bates Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX (510) 686 9689 <br /> 1WAnalytical 819 Striker Avenue Suite S Sacramento, CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> PbS Services Client Project ID Unocal #6348, 3788 Tracy Blvd , Tracy <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 4091932 Reported Sep 30, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Oil&Grease <br /> Method SM 5520 BF <br /> Analyst D Newcomb <br /> Date Analyzed Sep 30, 1994 <br /> Instrument I D # N/A <br /> Sample# BLK092994 <br /> Sample <br /> Concentration 93 <br /> Sample <br /> Duplicate <br /> Concentration 91 <br /> % RPD 22 <br /> % RPD <br /> Control Limits 0-30 <br /> SEQUOIA ANALYTICAL, #1271 <br />&Ignature on File <br /> Alan B Kemp <br /> Project Manager <br /> 4091932 MPD <2> <br />