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HOUSTON LABORATORY ' <br /> 8880 INTERCHANGE DRIVE <br /> HOUSTON TEXAS 77054 <br /> ** SPL QUALITY CONTROL REPORT ** PHONE(713)660.0901 <br /> Matrix Soil Reported on 10/21/99 <br /> Analyzed on 10/21/99 <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 /> Matrix Spike 1 Matrix Spike QC LIMITS 1 <br /> SPL Sample IMethodl5amplelSpike I 1 Duplicate 1 RPD 1 {Advisory) C <br /> 1 I I I i I i I i <br /> 1 ID Number 1131ank IResultlAdded IResultIRecoverylResultIRecoveryI (%-) 1 RPD 1 !k REC 1 <br /> 1 Ikcarb Itcarb 1tcarb Itcarb I 1 1tcarb I % 1 1 Max 1 1 <br /> 19910418-13A 1 ND 10 05 10 08 10 13 1100 10 12 1 87 5 1 13 134 156 -131 1 <br /> -9910284 <br /> Samples in batch <br /> 9910418-13A <br /> COMMENTS <br /> LCS#94453138--10 <br />