2013-01-30_HYDROLOGY - M1978052 - Laserfiche WebLink

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Mr. Heintz & Ms. Wynne Page 6 of 7 MMM South Platte Combined Replacement Plan January 28, 2013 In addition, the applicant shall verify that each entity making replacements for this plan are identifying this use on that entities' accounting submitted to our office. For the period of this plan, that entity is the City of Aurora (WDID 0802593 — Aurora Reuse). 7. All releases of replacement water must be sufficient to cover all out of priority depletions and be made under the direction and /or approval of the Water Commissioner(s). The replacement may be aggregated to maximize beneficial use. The Water Commissioner(s) and /or Division Engineer shall determine the rate and timing of an aggregated release. 8. The replacement water, which is the subject of this plan cannot be sold or leased to any other entity. As a condition of subsequent renewals of this substitute water supply plan, the replacement water must be appurtenant to this site until a plan for augmentation is obtained. All replacement water must be concurrent with depletions in quantity, timing, and locations. The use of replacement water must be in compliance with all agreements with the providers of replacement water. 9. Dewatering of Riverbend East site will produce delayed depletions to the stream system. This dewatering is not at a constant rate and thus monthly dewatering volumes must be reported and adequately accounted for monthly. At least three years prior to completion of mining, a plan must be submitted that specifies how the post pumping dewatering depletions (including refilling the pit) will be replaced in time, place and amount. The Applicant is hereby notified that if dewatering commences at any of the other sites included in this plan, then the SWSP must be amended immediately. 10. In accordance with the letter dated April 30, 2010 (copy attached) 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 you provide information to DRMS to demonstrate you 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. For the Riverbend West site, approach no. 1 and no. 3 will be utilized as evidenced by the Applicant's bond in the amount of $3,450,600. The approaches in the DRMS letter are not applicable to the Howe Pit and Riverbend East Pit as Denver Water is the permit holder and bonds are not required for municipal entities. 11. Approval of this plan is for the purposes as stated herein. This office must first approve any additional uses for which the water may be used. 12. The approval of this substitute water supply plan does not relieve the Applicant and /or landowner of the requirement to obtain a Water Court decree approving a permanent plan for augmentation or mitigation to ensure the permanent replacement of all depletions, including long -term evaporation losses and lagged depletions after gravel mining operations have ceased. If reclamation of the mine sites will produce a permanent water surface exposing groundwater to evaporation, an application for a plan for augmentation must be filed with the Division 1 Water Court at least three (3) years prior to the completion of mining to include, but not be limited to, long -term evaporation losses and lagged depletions. If a lined pond results after reclamation, replacement of lagged depletions shall continue until there is no longer an effect on stream flow. 13. The name, address, and phone number of a contact person who will be responsible for the operation and accounting of this plan must be provided to the Water Commissioner(s) and the Division Engineer.