2008-02-04_GENERAL DOCUMENTS - M1989056

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II. LAYOUT CONSTRAINTS The development of a constraint database to use for the analyses. on the Timnath Pit required the colle~;tion and review of data and entering that data into a Geographic Information System (GIS). Tlie initial stages of information gathering focused on maps, photos and survey data of the property. Overlaying drawings of the mining plan from the 1994 Tuttle-Applegate report provided a~i initial overview of the project. Survey data, including property corners and elevations, provided by King Surveyors, Inc. was then added along with researched data regarding setback;, utility easements, and floodplains. Figure 2.1 shows the locations of all the setbacks, utility easements, and rights of way discussed in this section. 2.1 Setbacks :ard Right-of--Ways The total area of the property containing the Timnath Pit is 280 acres. For the development of the reclamation and mitigation plan, we analyzed the property based upon the phased mining plan from the original Department. of the Army Mining Permit (404 permit) issued by the Army Corps of Engineers (COE). After transferring the mining phase map into the GIS it was deterrruned that the total combined area of the mining phases is 262 acres. The 18-acre difference is due to the boundary conditions around the mining area. In order to avoid encroaching on neighboring property and to facilitate access to all sides of the mine a 40 to 50 foot setback was established and has been maintained between the mine and the property boundary where greater setbacks were not already required. Two ditches have right-of--ways that reduce the minin€; area. The northern edge of the property is partially bounded by the Fossil Creek Reservoir ~~utlet Ditch (Fossil Creek Outlet). The Fossil Creek Outlet has a 100-foot right-of--way granl:ed by deed in 1902. The other ditch, the Arthur Lateral, clips the southwest corner of the property. In accordance with the 404 permit, the outer boundary of the mining operation must be; at least 100 feet away from the edge of the Cache La Poudre River (Poudre River). The Poudre River flows through the upper northeast corner of the property and along the upper portion of the southeast property boundary. In combination, the easements and setbacks described make ul~ the combined 18 acres that reduces the total area to the mining area and sets the outer boundar;~ for mining operations. Other issul~s pertaining to the required setback from the river were also considered in the construction of the constraints database. The Ayres Associates, Inc. report dated May 1, 1998 requested by Keliul and submitted to Larimer County Engineering discusses the possible hydraulic ramifia~tions of mining the Timnath Pit. The report, included as Appendix A, T:IOPEMCodkc011codkc0i finnl reporLdoc 2 ANCJERSON CONSUITINC~ ENCIINEERS, ANC.