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March 2000 -7- 993-2099.150 <br />data used as part of these designs, which have been approved by the MLRB and OMLR, <br />have been included as part of the Phase IV design. <br />Base topography for the Phase IV area was based on digital contour maps of the area with <br />a five-foot contour interval, and is shown in Drawing No. 2. Surveying and development <br />of the digital topography was performed by Western States Surveying, Inc. (WSSI). The <br />design features, consistent with that submitted previously as part of the existing VLF <br />design, have been selected and developed through the integration of state-of--the-art <br />methods, design criteria, and site-specific conditions to minimize the potential for releases <br />to the environment. <br />1.3 Design Criteria <br />Golder completed the engineering design for Phase IV using the following design criteria: <br />Valley Leach Facility <br />- Maximum Ore Depth <br />- Nominal Ore Angle of Repose Slope <br />- Overall Operational Ore Sideslope (along <br />north and east sides of valley leach facility) <br />- Operational Ore Sideslope <br />(all areas, except upgradient of Phase II <br />Toe Berm) <br />- Lift Height <br />i <br />590 feet <br />1.3H:1V <br />1.6H:1V <br />2.SH:1V (to elevation <br />9,620) <br />2H:1V (above elevation <br />9,620) <br />Varies (150 feet max.) <br />1:199\2099\FINAL REPORN099MAIN3.DOC Golder Associates <br />