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~IVIAP Surveys, Inc. MAPPING -PLANNING -SURVEYING SSS [-~' Y~ P.O. BOX 290 • MESA, CO 81643 • (970) 268-5851 • FAX: (970) 268-5256 May 1, 2006 ~ `'' "~~" ` .' Received Mr. Steve S. Shuey Colorado Division of Minerals and Geology ~aY ~ 9 2UU6 101 S. 3rd Street -Suite 301 Grand Junction, CO 81501 /rend Junofion Field Office / Division of Minerals & Geology RE: Upland Gravel, Permit No. M-2001-088 Application for conversion to 112c (CN-01)~ Response to Preliminary Adequacy Review (March 8, 2006) ADEQUACY ISSUES EXHIBIT C -Pre-mining and Minino Plan Maps 1.) Utilities installed for Upland Estates Subdivision have been added to the maps. 2.) Affected area and excavation area boundaries have been identified and shown on the maps. 3.) The affected area boundary has been revised to exclude several of the man made structures within 200 feet of Unit 11. Utilities for Upland Estates will remain within 200 feet of the affected area boundary. 4.) The mining plan has been labeled to show over burden and top soil stockpile areas. 5.) Silt fencing and straw bales are currently being installed below berms and the gravel contact zones outside the excavation boundaries on the existing slopes to control sediment travel. The pit area dips to the North and increases in depth. All storm water and sediment within the pit is contained by berms. The existing pit berms will hold in excess of a four foot depth of water. 6.) The affected area and unit boundaries have been revised to include the overburden spillage. EXHIBIT D -Mining Plan 7.) The mining of the gravel deposit started in 2001 has revealed that the deposit and corresponding overburden dips approximately at a 4% slope to the Northeast. The overburden and topsoil has varied in depth from none at the gravel contact area to approximately 15 feet at the highest point on the existing ground surface. The original ground surtace from the highest point also slopes or dips to the Northeast at approximately the same rate. It is assumed that the overburden shall remain 14 to 15 feet thick with a topsoil cap of 1 to 1.5 feet thick. Quantity calculations are based on these observations. The mining plan has been revised accordingly to handle these soils on a unit by unit basis.