PERMFILE106392 - Laserfiche WebLink

Home Browse Search

- ;_ TUTTLE APPLEGATE, INC. ~~ Consultants for Land and Resource Development Mr. fiichael Boyd Reclamation Specialist Mined Land Reclamation Division February 20, 1990 Page 4 The 3uestion about achieving reclamation is not going to be one of whether the reservoir can be lined and filled. It is going to be one of who the fortunate entity is that is going to use the reservoir. Enclosed is a copy of a recent filing in Water Court Case 89CW233 on the South Platte River. In it you see seven different gravel pits that have had filings placed on them for use as storage reservoirs. This would indicate sufficient interest and viability in achieving the afteruse proposed. 5.a. The clay generated on-site will come from two sources. Suiteible overburdens will be stockpiled as stripping is done for reuses as the liner. This material will be clay lenses deposited by the Platte River during floods. Additional material will come from the claystone bedrock that underlies the gravel deposit. Dry mining will expose this bedrock to the atmosphere which encourages air slaking. This material turns into a plastic clay that is impermeable. b. The clay will be placed in a zoned earthfill construction that will isolate the impermeable barrier. c. Design specifications have not been finalized. The specification that has to be met by the State Engineer is not difficult. The permeability as compared to that required on solid. waste landfills is much easier to achieve with standard compaction techniques and careful placement of material. Alternate techniques for constructing the liner such as the importation of bentonite or the use of man-made liners can be done. However, based on the experience of similar operations in the area, it is highly unlikely the liner would not meet specifications. The Adolph Coors Company has successfully lined several gravel pits with this technique using on-site materials. We will submit final design drawings to MLRD once they have been finalized. 0~ 'k