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EaaconMobil Global Services Page 25 <br />Colony Shale Oil Project <br />ESR Reclamation Studies <br />• Weighing Lysimeter Performance 1990-2003 <br />Project No. 353 <br />combusted shale. This was not known for certain at the time the ESR test plots were constructed, <br />partly because the TDR technology was still relatively new technique (Tope et al, 1980, 1982), and <br />because the probes had to be custom-built with short parallel probes to be able to work in salty soils <br />such as ESR combusted shale. However, the system proved to be as accurate as the more commonly <br />used neutron probes, allows for more precisely located measurements and much more rapid field <br />sampling efforts. It is likely the technology has advanced over the past 20 years to the point at which <br />custom hardware is no longer needed. For example, ASTM now has specifications for soil moisture <br />measurements using TDRs (ASTM D6780-05), and the technology may eventually complement or <br />supplant nucleaz methods for routine measurement of soil moisture in highway fill compaction . <br />• <br />• <br />LACHEL FELICE & Associates <br />