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-61- <br />• MR. JOUFLAS: Curtain -- slurry. Yeah, I was going to ask that. IJhat's <br />slurry? <br />MR. JOHNSON: Actually, it never was a grout curtain. It was miss-named <br />by parties who should remain unnamed. <br />MR. HOLDER: I think it'd help almost everybody in the room, if you'd <br />explain what it is really going to be. <br />MR. MASSEY: Just go after it. Just start with the buttress and then go <br />to the slurry wall. <br />MR. BANTA: The issues are distinct. <br />MR. MASSEY: Yeah, Jim worked on both and is the individual to respond. <br />• MR. JOHNSON: Okay. The buttress, by definition, it's a berm of placed <br />material that will be placed against that pit wall to, essentialVy, on <br />average, lower the average slope and increase the stability of that pit wall. <br />The buttress has been designed to be a relatively free-draining structure that <br />will increase the lowest factor of safety to about 1.8, with 1.5 being the <br />minimum required fora long term static type of stability analysiis. That's <br />the upper part of the buttress. The lower part of the buttress, which is <br />actually at an out-slope of 18 degrees or approximately 3.1 has a much higher <br />factor of safety on the order of 2.5. The buttress has been desiigned to -- to <br />act as a free-draining structure to maintain the integrity of that pit <br />wall--maintain the stability and to maintain separation between the pit wall <br />material and the buttress. So, its primary function is to increase the <br />stability of that pit wall to prevent any kind of a rotational failure in the <br />slope. <br />MR. BARRY: What's the difference between partial backfillir~g and <br />building a buttress? <br /> <br />