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Semi-Annual Subsidence Monitorine Reoort <br />Period: January 1, 1997 -June 30, 1997 <br />Page 2 <br />The maximum measured subsidence along the water line occurs at Monument I, with a current <br />deflection of 3.12 feet as compared to the original survey. This value is within the permit <br />maximum expected and worst~case expected subsidence values of 2.79 and 4.36 feet respectively. <br />No new surface cracks or other subsidence related features were observed during the reporting <br />period. Previous surface cracks, as documented in the semi-annual reports, have healed and not <br />reappeared. <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 />