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Range <br />Timber <br />Weeds <br />representative as soon as possible and no later than the first business day of any <br />unexpected discharges. Contact numbers: 970 - 826 -5000 and 970 - 826 -5077. <br />11. Prior written approval must be obtained from the BLM before cutting or modifying any <br />fence or other range improvement on public land. This includes laying the fence down <br />and driving over the wires. Contact the BLM Field Office responsible for surface <br />management to obtain the aforementioned written authorization and the minimum <br />construction specifications that must be followed. <br />12. Destruction or felling of trees is to be avoided wherever possible. Partial de- limbing is <br />the preferred alternative. Ponderosa pine is protected and should not be disturbed. <br />Water Resources <br />13. Drill holes must be plugged as soon as possible. If holes cannot be plugged <br />immediately, they should be temporarily sealed in a manner to prevent injury to the <br />public, wildlife, and livestock, and to prevent the migration of fluids. Proper <br />abandonment of drill holes will be achieved when: 1) all aquifers are adequately <br />cemented or otherwise isolated to prevent the migration of liquids or gasses, 2) the <br />surface hole is properly plugged to prevent injury to the public, livestock, and wildlife, <br />and 3) the surface is properly cleaned up and reclaimed per 3809 regulations. In the <br />event water is encountered within 500 ft. of the surface, a bentonite or cement plug <br />should seal the aquifer and extend 50 ft. above and below the water contact. In the event <br />water is encountered below 500 ft. from the surface, a bentonite or cement plug should <br />seal the aquifer and extend 100 ft. above and below the water contact. <br />14. Use of water for drilling or mining purposes must conform to Colorado State regulations. <br />Artificial water impoundments used to fill water trucks on public lands must be pre - <br />approved. <br />15. You should provide information regarding the characteristics of the water - bearing unit <br />including: formation, depth, thickness of the water - bearing zone, and rate of flow. A <br />sample of any groundwater must be analyzed for TDS and pH and results reported to the <br />BLM. <br />16. To help prevent the establishment of noxious weed infestations, all heavy equipment <br />(including motor grader, bulldozers, backhoes, and trenchers) should be pressure washed <br />at an offsite location prior to entering the project area. Pickup trucks and passenger <br />vehicles are not subject to this requirement. If heavy equipment is removed from the <br />project area, it should again be pressure washed at an offsite location prior to re- entering <br />