2023-02-16_HYDROLOGY - M2000158 - Laserfiche WebLink

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David M. Heintz S &t H Mine SWSP February 16, 2023 Page 7 of 11 Any use of any such excess replacement credits must continue to be directly related to the mining of sand and gravel. Long Term Augmentation Requirements In accordance with the letter dated April 30, 2010 from the Colorado Division of Reclamation, Mining, and Safety ("DRMS"), all sand and gravel mining operators were required to demonstrate to DRMS how they were in compliance with the requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the protection of water resources by April 30, 2011. The operator's response to the DRMS letter has not been provided to this office. The final reclamation of the pit includes backfilling or lining of all exposed groundwater within the permit boundary. The operator currently has a bond through DRMS in the amount of $4,800,000 to cover reclamation cost. Such a bond must be maintained until the Division Engineer's office approves a liner for the exposed surface area as meeting the gravel pit lining criteria, or the exposed surface area must be backfilled. Conditions of Approval I approve the proposed SWSP in accordance with Section 37-90-137(11), C.R.S., subject to the following conditions: 1. This SWSP shall be valid for the period of October 1, 2022 through September 30, 2023, unless otherwise revoked or superseded by decree. If this plan will not be made absolute by a water court action by the plan's expiration date, a renewal request must be submitted to this office with the statutory fee (currently $257) by August 1, 2023. If a renewal request is received after the expiration date of this plan, it will be considered a request for a new SWSP and the $1593 filing fee will apply. 2. Well permit, no. 65464-F was obtained for the current use and exposed pond surface area of the gravel pit in accordance with §37-90-137(2) and (11), C.R.S. and this permit remains valid. 3. The total surface area of the groundwater exposed at the S&tH Mine must not exceed 13.36 acres during the approval period of this SWSP, resulting in an annual evaporative loss of 36.60 acre-feet. 4. The annual water used for dust control at the SFIG Mine site shall not exceed 9.99 acre-feet and the total product mined at the SFIG Mine site shall not exceed 680,800 tons during the SWSP period, which results in 10.02 acre-feet of water lost with the mined aggregate. 5. Total consumption at the S&tH Mine must not exceed the aforementioned amounts unless an amendment is made to this plan. 6. All pumping for dust control and gravel washing shall be measured in a manner acceptable to the division engineer.