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Semi-Annual Subsidence MonitorinE Repo <br />Period: Period November 1, 1995 -June 30, 1996 <br />Page 2 <br />Survey data for an additional monument, shown as "C-V Joint" on Table 1, are included on this <br />report. This monument lies adjacent to the water line, along County Road 15, approximately 740 <br />feet northeast of Monument F. The monument was established in 1991 for vertical control during <br />surveys of the water Line. It was undermined during the reporting period and is no longer used as <br />a control point. Its location adjacent to the water line provides an additional subsidence data point <br />for the area near the eastern extent of Southfield's room and pillar operations. <br />Surface cracks resulting from subsidence appeared on County Road 15, approximately 600 feet <br />northeast of Monument F, during May 1996. These cracks ran almost perpendicular to the road, <br />and measured 0.25 to 0.60 inches wide. Typically, the cracks did not persist into the meadows on <br />either side of the county road. Only the compacted gravel surface of the road was hard enough to <br />exhibit the effects of subsidence strains. The cracks caused no damage to the road or interruption <br />of its use. After consulting with Fremont County road department personnel, EFCI regraded the <br />short section of affected roadway. In addition, there are no indications that the observed <br />subsidence adversely affected operation of the Florence Water Line. <br />Subsidence monitoring of structures indicates that subsidence is occurring only at certain locations <br />along the water line, and that the magnitude of displacement is within predicted values. Only <br />minor additional subsidence is expected to occur at the structure monitoring locations. <br />