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,: , ~. iiiiiiviiiiiiiuiii • • 999 SANDCO THE FINEST IN MASONRY SAND P. 0. BOX 1773 ~ DURANGO, COLORADO 81301 ~ PHONE 247-1303 June 23, 1987 Colorado Mined Land ~~~ ~ ~ e E Reclamation Division 423 Centennial Building ~~L 81987 1313 Sherman Street Denver, Co 80203 MINED LAND Attention: Patricia Martinek CiECLAMATION DIVISION Dear Pat: As r~aquested by your letter dated June 2, 1987, the following adequacy items are addressed in the order of presentation therein. Exhibit C - Mining Plan Ma The Mining Plan Map has been corrected to include items 2, 3, and ~4. Four copies of the revised map dated June 14, 1987 are enclosed herewith. As discussed with you, items 1 and 5 are provided for in items 1 and 2 of Exhibit E, following. Exhibit D - Mining Plan 1. As stated in the mining plan, the pit run sand and gravel will be transported to the stockpile and processing area shown in Exhibit C. The sand and gravel materials will be processed in this area by screening, crushing, washing and classifying. water used in the washing operations is discharged through a pipe to the settling pond, shown on Exhibit C, where the water percolates through the embankment returning to the river system clear and free of sediment. No direct discharge of wash water is made to the river, whether by overflow or otherwise. Additionally, materials will be processed through a concrete batch plant where certain chemicals, i.e. air entraining and water reducing admix- tures will be incorporated in the concrete. None of these chemical admixtures are discharged to the river, thus alleviating any disturbance to the hydrologic balance of the river. 2. Sandco does intend to isolate the river from the work areas through the use of berms and dikes. These dikes would serve to confine any muddy water to the work area and also to tempor- arily confine the river to a single channel during excavation operations. This channel would not be of a dimension so res- tricted to cause erosion and bank instability. However, as stated in E~:hibit E, paragraph No. 4, Sandco does intend to armor any areas of streambank where actual erosion is occurring or pending.