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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 />Timber <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 immediately, <br />they should be temporarily sealed in a manner to prevent injury to the public, wildlife, <br />and livestock, and to prevent the migration of fluids. Proper abandonment of drill holes <br />will be achieved when: 1) all aquifers are adequately cemented or otherwise isolated to <br />prevent the migration of liquids or gasses, 2) the surface hole is properly plugged to <br />prevent injury to the public, livestock, and wildlife, and 3) the surface is properly cleaned <br />up and reclaimed per 3809 regulations. In the event water is encountered within 500 ft. <br />of the surface, a bentonite or cement plug should seal the aquifer and extend 50 ft. above <br />and below the water contact. In the event water is encountered below 500 ft. from the <br />surface, a bentonite or cement plug should seal the aquifer and extend 100 ft. above and <br />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 />Weeds <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 />the project area. In areas of heavy weed infestations, equipment shall also be cleaned <br />prior to moving out of the area. <br />17. Any gravel or fill imported onto BLM lands must come from sources approved by the <br />BLM. <br />18. The Holder shall be responsible for control of all State listed noxious weed species on all <br />disturbed areas. The Holder shall consult with the Authorized Officer and local