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i <br /> <br /> <br />At the tce of the slide, inclinometers I1C-15, I1C-23, I98-06 installed during the installation of the pins, <br />indicate a definitive shear plane 55 to 65 feet below the surface. Movement rates over a monitoring period <br />from October 2000 to September 2001 are as follows for the selected inclinometers: <br />• I1C-I5, 0.25 inches/yeaz, LVC-1 classification. <br />• I1C-23, 0.25 inches/yeaz, LVC-1 classification. <br />• I98-06, 0 inches/yeaz, LVC-1 classification. <br />Surface movements at the [ce of the slide indicate little or no movement. Movement rates at the shear <br />plane of thr•. slide indicate that there is slight movement but at extremely slow rates, and the depth of this <br />shear plane has no[ changed during the period of measured movement. <br />J5.4 Stone Columns <br />The response of piezometers in the stone columns can be found in graphs provided in Appendix J2. <br />Locations of the stone columns are shown on Figure I1 of the 2000 Addendum. A detailed description of <br />stone columns is provided in the 1999 Addendum. <br />Based on observation of the 2000-2001 stone column water levels, it is generally concluded that the stone <br />columns to a greater or lesser extent collect and drain water. Collectors and drainers of water include SC- <br />2, SC-03, SC-05, SC-07, SC-15, SC-16, SC-17, SC-18, SC-19, SC-20, SC-21, SC-22, SC-23, SC-26, SC- <br />29, SC-33, SC-44, SC-47, SC-48, SC-49, SC-51, SC-52, SC-61, SC-64, SC-67, SC-68, SC-69. Collectors <br />of water include SC-60. <br />Stone columns were not pumped in either 2000 or 2001. <br />Generally, the stone columns appear to collect water faster than it can drain. Therefore, active pumping of <br />the stone columns, if performed, will reduce the amount of water entering the slide and will assist with <br />dewatering. <br />Barr Englneering Company <br />PCDOCSt230503/CAK <br />December 75, 2000 <br />11 Appendix J <br />2001 Addendum 10 <br />1997H9 L•ndcllde Corrective Measures Report <br />