2015-10-30_HYDROLOGY - M1982147 - Laserfiche WebLink

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Thomas A. Williamsen, P.E. October 21, 2015 Page 3 Long Term Augmentation 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 must comply with the requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the protection of water resources. The April 30, 2010 letter from DRMS requires that mining operators provide information to DRMS to demonstrate they can replace long term injurious stream depletions that result from mining related exposure of ground water. The DRMS letter identifies four approaches to satisfy this requirement. The 2nd approach is to obtain a court approved augmentation plan. As previously discussed the Applicant has obtained a court approved augmentation plan under Case No. 05CW146 Conditions of Approval I hereby approve the SWSP in accordance with 537-90-137(11), C.R.S., subject to the following conditions: 1. This SWSP shalt be valid for the period of November 1, 2015 through October 31, 2016, unless otherwise revoked or modified. If the Applicant cannot operate under the court approved augmentation plan by the plan's expiration date, a renewal request must be submitted to this office by September 15, 2016. 2. Well permit no. 42538-F was issued for the Nyholt-Mann Lake. 3. The total ground water surface area exposed post 1980 at the Nyholt-Mann Lake shall not exceed 51.5 acres, resulting in an annual evaporative loss of 149.8 acre-feet. 4. Total consumption at the Nyholt-Mann Lake Pit must not exceed the aforementioned amounts unless an amendment is made to this plan. 5. Water flows into the Nyholt-Mann Lake from Brantner Gulch. The Applicant must release all out -of -priority storage in the Nyholt-Mann Lake within 72 hours or augment such out -of -priority storage under a separate SWSP or court approved augmentation plan. In order to assure that water is not being stored out -of -priority the Applicant must install measuring and recording devices as required by the division engineer and water commissioner to measure the amount of water flowing into and out of Nyholt-Mann Lake. The Applicant must consult with the water commissioner prior to installation of the measuring and recording devices and obtain approval of the measuring and recording devices from the water commissioner after installation. In addition, the Applicant must provide accounting as required by the division engineer and water commissioner to show that water is not stored in Nyholt-Mann Lake out -of -priority. 6. Approval of this plan is for the purposes as stated herein. Any additional uses of this water must first be approved by this office. 7. All releases of replacement water must be sufficient to cover all out -of -priority depletions in time, place, and amount and must be made under the direction and/or the approval of the water commissioner. The release of replacement water may be aggregated to maximize beneficial use if approved by the water commissioner or