2008-03-12_GENERAL DOCUMENTS - C1981019

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provide their analysis of the need (or lack thereof) for a point of compliance for alluvial groundwater, in the form of a Technical Revision, to the Division no later than 31 July 2008. The Division would like Colowyo to confirm whether or not this date works for them and, if'not, to propose an alternate date for providing this information to the Division. The third item on the agenda was to discuss the overall Colowyo hydrologic monitoring plan. It was determined that the plan was discussed at length when we discussed alluvial wells A7 and A8 and the points of compliance discussion and that no further discussion was warranted at this point. The fourth and final item that was discussed was the Divisions concerns with the Prospect Pond and the Prospect drainage. Basically, the Division believes that there is the possibility that there could be major erosional problems, extreme sedimentation and a possible pond embankment failure at the Prospect Pond. At issue is the SEDCAD model that was used to size the Prospect Pond. This model breaks the Prospect watershed up into several different subwatersheds based on the reclamation stage they are in. These stages are newly regraded and topsoiled, reseeded 1-2 years and reseeded 3+ years. The model is very clear as to how many acres can be in each of these three stages of reclamation. It is the Division's position that the spoil regrading map is very vague as to when the East Pit will be regraded and when final closure will occur and that not adhering to the approved SEDCAD design for the pond could be catastrauphic. The Division has asked Colowyo to provide a more detailed description and timing of the final regrading and closure of the East Pit, including a map or plate and acreages of each regrade area, to ensure that it will conform with the approved design and the SEDCAD modeling. Additionally, the Division has also requested that Colowyo provide a more detailed description of any alternate sediment control measures that it will use in the East Pit reclamation. 'T'his information will allow the Division to more accurately assess the East Pit reclamation and give the Division a higher level of confidence with regards to the Prospect drainage and the Prospect Pond. The issues regarding the Prospect drainage and the Prospect Pond were initially addressed in the Colowyo Permit Renewa105 preliminary adequacy review letter, dated 20 August 2007, question 10. It would be appropriate for Colowyo to respond to the concerns in the Permit Renewal. Additionally, the proposed decision date has passed for Permit Renewa105. Please request a 60-day extension for the decision date. This concludes; the items that were discussed at the 26 February 2008 meeting. The Division believes that there is now a plan for addressing all of the above issues. Each issue has its own timeframe for resolution that was agreed upon at the meeting. Please submit the appropriate revisions as detailed above by the required date(s). Please contact me at (303)866-4929 if you have any questions.