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<br /> <br />i <br />Construction of additional corrective measures will be based upon the Observational Approach, with <br />measures undertaken only if dictated by the observed conditions. Further corrective measures could <br />include other horizontal dewatering trenches, micro piles and retaining wall repairs at the portal and along <br />the access roads. <br />H3.1 Update of Existing In-Place Corrective Measures <br />Pins (Micro Piles). Installed in 1998. Refer to "1997/98 Landslide Corrective Measures Repots" for a <br />detailed description of the micropile installation. <br />RCC Buttress. Initially installed in 1992 and expanded in 1997. Refer to "1997/98 Landslide Corrective <br />Measures Report" for a detailed description of the RCC buttress installation. <br />Dewatering Wells. Installed in 1997. Refer to "1997/98 Landslide Corrective Measures Report" for a <br />detailed description of the dewatering well installation. Presently, the wells are not pumped due to <br />insufficient collection of groundwater and very low pumping capacity. <br />Stone Columns. Installed in late 1997 and early 1998. Refer to "1997/98 Landslide Corrective Measures <br />Report" for a detailed description of the stone column installation. Monitoring of water levels in the stone <br />columns indicates that some of the columns do not drain water effectively to the cobble layer, but none- <br />the-less are good groundwater collectors. These columns aze pumped on an periodic basis to remove water <br />from the slide. Approximately 51,000 gallons of water have been pumped from stone columns SC-20, SC- <br />22, SC-29 and SC-68 between Mazch and July of 1999 to assist with removal of water from the landslide. <br />Horizontal Wells or Drains. Installed in early 1998. Refer to "1997/98 Landslide Corrective Measures <br />Report" for a detailed description of the horizontal well installation. These wells typically collect a total of <br />6 gpm during the spring and 2 gpm during other times of the year. <br />Pond Lining. Installed in 1998. Refer to "1997/98 Landslide Corrective Measures Report" for a detailed <br />description of the pond lining. <br />Barr Engineering Company <br />PCDOCS1208220/CAK <br />JUIy 31, 1999 <br />11 Appendix H <br />1999 Addendum to <br />1997198 landslide Corrective Measures Report <br />