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..vZ • <br />2. Climax personnel will be watching the tailing system <br />for blowing dust much closer than in past years. <br />These observations will be the basis for initiating <br />control activities. <br />3. Considering the past success of the program (prior to <br />1986), Climax sees little purpose in maintaining <br />formal monitoring records, since informal observations <br />generally serve to initiate the program. However, <br />Climax will keep improved records relative to <br />suppression activities (e.g., date of start, specific <br />application areas, etc.). <br />4. Coherex applications on dams will extend over the <br />crests a nominal distance (page 5 of the Plan). These <br />crest areas generally are not subject to water erosion <br />to the degree of the lower faces. Water erosion was <br />not a problem in these areas in the past and should <br />not present a problem in the future. However, on mid <br />and lower dam faces, water erosion under previously <br />applied Coherex is more than "minor" in some areas. <br />Climax believes at this time that application of <br />Coherex to steep tailing dam faces beyond the crests <br />is not a good engineering practice. In addition, as <br />discussed in No. 7 herein, implementation of rock <br />facing of dams will begin in 1987. <br />5. See #4. Accelerated erosion has been a problem only <br />when Coherex has been applied to steep mid-lower dam <br />faces. <br />6. Refer to letter dated December 4, 1986 from the <br />,Colorado Air Pollution Control Division to AMAX <br />~i ~'~yscapeeaestsMOfDthe effectiveness of kilaudustmand <br />~~,.r"\th~cement as control agents. However, at this time, <br />~ Climax cannot consider large scale use of any material <br />b~;~,~ which might preclude or jepordize future attempts to <br />revegetate the tailing ponds. We will forward to the <br />MLRD copies of research results as well as a copy of <br />the report discussed in the referenced letter. <br />7. The general three year schedule for rock application <br />and related activities is: 1) 1987 - Complete <br />~i~ ~~ engineering and design of highway overpass; Initiate <br />a ,`, rock facing of Dam 5 (Mayflower); 2) 1988 - Complete <br />~~~~ rock facing of Dam 5; Complete construction of <br />. ~ryr~ highway overpass; Begin draining of Robinson Pond; <br />.~S ')~ -~) 198 - Recontour Dam 1 (Robinson); Begin rock <br />Q facing of Dam 1; Begin rock facing of Dam 3 (Ten <br />Mile). This schedule and additional scheduling will <br />be discussed in more detail during the reclamation <br />plan amendment process. <br />-2- <br />