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9. Please indicate what precipitation event the drainage control features were designed for. Please <br />indicate what measures will be implemented at the down gradient end of the upland diversion <br />ditch to dissipate flows and ensure no off-site erosion occurs from this concentrated discharge <br />point. Please show energy dissipaters and erosion control structures on the permit maps. <br />Exhibit D -Reclamation Plan <br />10. Response acceptable. <br />11. Please revise the slope configuration to 2H:1 V which is the maximum considered to be traversed <br />by livestock (see Rule 3.1.10(3)). If a final slope grade of 2H:1 V is committed to, the submitted <br />geotechnical stability report is acceptable, <br />12. See no. 11 above. <br />13. Response acceptable. <br />14. Response acceptable. <br />15. Response acceptable. <br />16. If the flat portion of the mined out area is to be used as an equipment staging area for the landowner, <br />it is not necessary to include revegetation plans, as this proposed post mining land use is reasonably <br />assured, given the current and foreseeable future oil and gas production activity in that area. In the <br />event the flat is not used as a drilling pad, the staging area reclamation requirements are acceptable. <br />17. Response acceptable. <br />18. Please revise the reclamation cost estimate to account for any revisions made in response to the <br />comments above and clarify the slope grading includes cut and fill of the benches to create the <br />final slope. <br />Exhibit E -Maps <br />19. Response acceptable. <br />20. Response acceptable. <br />21. Response acceptable. <br />22. Per Rule 6.3.5(3) -Reclamation Plan Map: please indicate the area to be affected and subject to <br />revegetation applications, indicate the average thickness of growth medium to be replaced and <br />the replacement locations. <br />If you need additional information, please contact me at the Division of Minerals and Geology, Grand <br />Junction Field Office, 101 South Third Street, Room 301, Grand Junction, Colorado 81501, telephone no. <br />970-243-6368. <br />Sincerely, <br />S(ev~huey - ~ <br />Environmental Proteeti'on Specialist <br />