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HOUSTON LABORATORY <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON TEXAS 77054 <br /> � PHONE(713)660 4901 <br /> ** SPL QUALITY CONTROL REPORT ** <br /> Matrix Soil Reported on 10/14/99 <br /> Analyzed on 10/14/99 <br /> Analyst . TW <br /> This sample was randomly selected for use in the SPL quality control <br /> program Samples chosen are fortified with a known concentration <br /> in duplicate The results are as follows <br /> Total Organic Carbon in Soil as % Carbon <br /> Walkley-Black <br /> SPL Sample Blank LCS Measured % QC Limits <br /> ID Number Value Concentration Concentration Recovery Recovery <br /> %carbon %carbon %carbon <br /> LCS ND 1 . 00 0 . 92 92 . 0 $0 - 120 <br /> -9910193 <br /> Oples in batch <br /> 9910313-22A <br /> COMMENTS <br /> LCS##94453198-10 <br /> 99100109-04B USED FOR QC PURPOSE ONLY <br />