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The ditches and ponds are excavated in a basaltic mud flow alluvial material with a <br />very high permeability. Leakage through this sand-gravel-boulder material could <br />easily be confused with subsidence affects. <br />Worst case scenarios for the Scroggins house is differential settling causing cracks <br />in the foundation. The house is modular which should be rigid enough to allow <br />some differential settling before damage to the house occurs. The modular design <br />will allow releveling in the future. The floor in the shop may crack but the pole barn <br />type construction should not suffer any significant damage. <br />(c) Subsidence monitoring networks were established along the centerline of the Ute <br />Water pipeline and over 2nd and 3rd East room-and-pillar panes at the Roadside <br />South Portals to determine the commencement and magnitude of subsidence <br />movements. The location of the monitoring points are mapped in Exhibits 29 and <br />30. As stated previously, no further mining is planned in the area of the Ute Water <br />• pipeline. Surveying of the monuments over the pipeline was discontinued in 1986 <br />upon approval of technical revision TR-08. The monuments wi11 remain in place to <br />allow future monitoring, if necessary. <br />The subsidence monitoring program for 2nd and 3rd East panels was designed to <br />determine the critical parameters for room-and-pillar mining panels at the Roadside <br />South Mine. The locations of the monitoring points for this program are mapped in <br />Exhibits 29 and 30. Results of the most recent survey of the 2nd and 3rd East <br />monuments are depicted in the subsidence graphs of Exhibit 48, RS-21-018, RS- <br />21-019, RS-21-020, and RS-21-022 through RS-21-025. This information allowed <br />the determination of actual angle-of-draw and maximum subsidence over areas of <br />maximum mining recovery. The survey also confirmed the adequacy of the <br />protective pillars retained in the Rapid Creek area over the 3rd East Panel. <br />Monitoring of these monuments was discontinued in 1985 upon approval or TR-03. <br />Information gained in this study will be applied to the Roadside North Portals. <br />20-8 (Rev. Oi /01) <br />