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2-29 Stability analyses of critical slopes in the designed pile yield • safety factors of approximately 1.7. Because of the unknowns involved with the refuse properties, this conservative design is desired. 2.4.3 Refuse Handling Strategies Processing coal from Salt Creek Mining Company's mines will generate three types of refuse: +4" from the rotary breaker; -4" +;" from the wash plant; and -;" from the slurry ponds. Each refuse type will be handled separately. The +4" refuse from the rotary breaker will be approximately twenty-three percent of the total reject realized at full pro- duction. This material will be discharged into a stockpile after passing through the rotary breaker. A front-end loader will load the +4" material onto a 25 cubic yard capacity scraper which will transport it to the refuse disposal area. The scraper will then spread the material over the surface of the refuse pile • in one to two foot thick lifts. Normal operational trafficking of the scraper will compact each lift prior to placement of additional material on top of each successive lift. The -4" +;" material will be handled much the same as the +4" material except that, upon discharge from the wash plant, the -4" +;" material will be stored in a 500 ton bin. This bin will be capable of loading the scraper without the aid of a front-end loader. The scraper will then carry the refuse to the refuse area and deposit it. All -;" refuse fro ponds as described each settling pond generated over six dewatered, it will to the refuse area n the wash plant will be pumped to the slurry in Section 2.4.1. It is anticipated that will be capable of storing the -:" material months. After the -," material has been be excavated from the pond and transported for disposal.