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<br />• <br />C~ <br />When grouping stone columns 18, 20, 21, 22 and 23, columns that are not completed into the cobble layer <br />seem to build up water levels even after pumping, while columns built into the cobble layer build water <br />levels then drain and lower the water level. Overall, the data indicates that the columns are effective <br />collectors and drainers of water at least within the immediate region around the stone columns. <br />H5.5 Load Cells on RCC Buttress <br />In 1998, load cells installed on the anchors for the RCC buttress had shown very little change since [hey <br />were installed. A communication line to the load cells is presently being upgraded and the latest <br />information is unavailable at this time. <br />Barr Engineering Company <br />PCDOCS1208220ICAK <br />July 31, 1999 <br />20 Appendix H <br />1999 Addendum to <br />1997198 landslide Corrective Measures Report <br />