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1 <br />II <br />I~, <br />1 <br />III <br />1 <br />'I <br />1 <br />I <br />i <br />1 ' <br />- 18 - <br />water level may remain stable temporarily so that both the drain- <br />age system and the retaining wall might be installed at the <br />same time. <br />5. Attention should be paid to careful surface drainage so <br />that the existing conditions of surface drainage are not de- <br />teriorated by the proposed construction. <br />6. We expect that not all details of the drainage systems <br />and construction procedures can be worked out during the design; <br />they will have to be decided during the construction phase. <br />3.4 OTHER STRUCTURES <br />There are several other structures and facilities proposed <br />that are located within the landslide area. They include the <br />substation with a short road connecting it with the access road; <br />a shop and warehouse with the adjoining temporary offices and <br />parking lot; in the future, a waste rock conveyor is proposed. <br />A large refuse pile will be located immediately above the land- <br />slide area. The access road would be extended to the refuse pile <br />level. <br />Located outside the landslide area, but close to its toe, <br />is a runoff pond(MB ¢ 1) and the fresh water pond (F'W ¢ 1). <br />Geotechnical conditions and design considerations for these <br />structures and facilities were discussed at several meetings <br />with derrick ~ Company representatives. A summary of our re- <br />commendations for these structures is presented in the follow- <br />ing paragraphs: <br />The substation is located in the lower and flatter part of <br />the landslide area; stability conditions of old landslides are <br />c'wrro~o coraww, nc <br />