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<br />C <br /> <br /> <br />cavities expressed to surface is only 2.5 acres. Fls such, any potential <br />subsidence, which is only very remotely possible, is not expected to affect <br />the f•lahogany Zone or the strata above it, nor is any surface expression of <br />subsidence anticipated. Moreover, only very limited effects on groundwater <br />quality in the lower portion of the lower aquifer can possibly be expected, <br />even in the taorst case, due to the limited scale of operations. The same <br />is the case regarding future mineability of oil shale resources overlying <br />the Boies Bed. <br />In order to allow BLM to evaluate potential effects of subsidence on <br />--J <br />n <br />L.J <br />the groundwater and oil shale resources in the case of future commercial <br />development, IRI has endeavored to preliminarily assess the potential <br />effects of subsidence for a commercially-sized mining operation. In this <br />same context, IRI herein proposes a subsidence monitoring program to be <br />instituted concurrently with pilot plant operations to gather additional, <br />site specific data to further allow BLt•1 to assess subsidence effects <br />associated ~iith commercial-scale operations. These data are intended also <br />to aid IRI with future mine design efforts and overall project planning. <br />®c~ <br />Cli~~ c~'neeria~g, mac. <br />RIFLE, COLORADO 81650 <br />1-2 <br />