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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-4183 <br /> 781 Kingston Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory Work Order# 9604F67 01 Reported Apr 30, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte pH Flashpoint <br /> QC Batch. IN042496904500A IN0429961010008 <br /> Analy Method EPA 9045 EPA 1010 <br /> Prep Method N A N A <br /> Analyst S Chin D Williams <br /> Duplicate <br /> Sample# 9604E5301 9604135301 <br /> Prepared Date 4/24/96 4/29/96 <br /> loAnalyzed Date 4/24/96 4/29/96 <br /> nstrument I D # MANUAL MANUAL <br /> Sample <br /> Concentration 79 > 100°C <br /> Dup Sample <br /> Concentration 78 > 100'C <br /> RPD 13 00 <br /> RPD Limit 0-30 0-30 <br /> •SEQUOIA ANALYTICAL <br /> Kevin Follett <br /> Project Manager **RPD=Relative% Difference 9604F67 TTT <2> <br />