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9.a)Material balance calculations and down-hole remote sensing techniques will be used <br /> to determine cavity size. AmerAlia will work closely with the DMG, and individual <br /> cavities will be developed no larger than 125 feet in diameter during the initial mining <br /> sequence without first conferring with the DMG. In Section D-3.5 it was stated that <br /> "mining may be initiated over the entire open hole or be directed at specific intervals." It <br /> is currently contemplated that mining will occur by undercutting in one of the three <br /> experimental cavities, and that the other two cavities will be mined by spacing the <br /> injection and recovery points a short distance apart, and over a longer distance apart. <br /> Undercutting may not prove to be the most acceptable mining method. <br /> 9.b)AmerAlia will evaluate sophisticated remote sensing technologies, such as <br /> tomography and the high resolution magnetotelluric system,to evaluate cavity shape and <br /> dimensions and also to evaluate using material balance calculations to determine cavity <br /> shape and dimensions. AmerAlia will also evaluate other technologies that may be <br /> available to determine cavity shape and dimensions. AmerAlia will work closely with <br /> the DMG in reviewing these cavity shape and dimension evaluations as mining <br /> progresses. <br /> 9.c)A copy of the publication by Prats et al. (1977) is included with this Technical <br /> Revision as Attachment 7. <br /> 9.d)AmerAlia feels that the remote monitoring technologies mentioned above will <br /> adequately characterize cavity size and shape, and more importantly, pillar size and <br /> shape. <br /> 10)An evaporation pond will no longer be used. The solids remaining from evaporating <br /> water from waste streams will be sent to an approved landfill as they are generated. No <br /> costs to dispose of these solids after plant shut-down are anticipated. <br /> 1 l.a)The plant site will be fenced to exclude cattle using a standard barbed wire fence <br /> with cattle guards for road crossings. The evaporation and process ponds are no longer <br /> part of the Project. The lined well field drainage pond, if constructed,will be fenced <br /> following Colorado Department of Transportation(CDOT) specification for deer-proof <br /> highway fencing. The CDOT fence corresponds to Standard M-607-1 "Deer Fence and <br /> Gate." The deer-proof fencing will be placed on a uniform, constructed ground surface <br /> avoiding gaps to assure exclusion of large animals. <br /> 1 Lb)Evaporation ponds are no longer part of the Project. A low water level of fresh <br /> water likely will be maintained in the lined well field drainage pond(to protect and <br /> anchor the liner), and this water will not be harmful to birds (or other wildlife). The liner <br /> may alternatively be anchored by placing tires, sandbags, or other inert objects on the <br /> liner. <br /> 1 l.c)For final reclamation,AmerAlia will plant shrub tublings or seed as appropriate to <br /> achieve an adequate shrub component for wildlife value on approximately 20 percent of <br /> 6 <br /> DMG 11-23-99 Response AmeriAlia,Inc. <br />