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j SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> Iwo (415) 364-9600 • FAX (415) 364-9233 <br /> RESNA V 4Client Project ID 150047 01, Ekholm Prop A <br /> 1710 Main Street Matrix Soil <br /> Escalon, CA 95320 <br /> Attention John Lane QC Sample Group 4A20801 Reported Jan 25, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE pH Reactive Flashpoint <br /> Sulfide <br /> Method EPA 9045 SW-846 EPA 1010 <br /> Analyst. Y Arteaga K Newberry K Newberry <br /> Date Analyzed 1/7/94 1/19/94 1/13/94 <br /> Sample# 4A20801 4A43801 4A54501 <br /> Sample <br /> Concentration 72 ND > 1WC <br /> Sample <br /> Duplicate <br /> Concentration 72 ND > 100T <br /> % RPD 00 00 00 <br /> % RPD <br /> Control Limits 0-30 80-120 -5 0°C <br />*SEQUOIA ANALYTICAL <br /> �0, <br /> Vickie Tag <br /> Project Manager 4A20801 WAT <6> <br />