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COLUMBIA ANALYTICAL SERVICES. INC. <br /> Client: EMCON Associates Date Received: 02/21/91 <br /> Submitted By: Bill Woods Date Analyzed: 02/27/91 <br /> Project: North County Landfill - Monthly/x939-02.31 Work Order#t: K910945C <br /> Sample Matrix: Water <br /> QA/OC Report <br /> Duplicate Summary <br /> Total Organic Carbon (TOC) <br /> EPA Method 415.1 <br /> mg/L (ppm) <br /> Duplicate Relative <br /> Sample Sample Percent <br /> Sample Name Lab Code MRL Result Result Average Difference <br /> G-1 K0945-1 0.5 ND ND ND — <br /> MRL Method Reporting Limit <br /> ND None Detected at or above the method reporting limit <br /> Approved by Date* <br /> 00003 <br /> 1317 South 13th Avenue P.O.Box 479 Kelso.Woshington 98626 • Telephone 206/577-7222 Fox 206/636-106f <br />