2024-06-18_HYDROLOGY - M1977436 - Laserfiche WebLink

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Holcim South Platte Combined SWSP June 18, 2024 Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, &t 6243 Page 19 of 26 Dewateri ng All sites that are actively dewatering have been equipped with a Totalizing Flow Meter ("TFM") to measure the dewatering discharge. Monthly dewatering volumes must be recorded monthly with the meter readings included on submitted accounting. As long as dewatering operations remain continual at constant rates the net accretions are assumed to offset any lagged depletions. Under this assumption, the Applicant is not claiming any dewatering credit. Once dewatering operations stop, or are significantly reduced, at specific sites the monthly meter readings will be used to analyze post pumping depletions. The sites that will be actively dewatered during this SWSP period are the Wattenberg Pit, W.W. Farms Pit, Tull Pit, Tucson South Pit, DPG Pit, and Irwin-Thomas Pit. Long Term Depletions and Reclamation 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 groundwater. The DRMS letter identifies four approaches to satisfy this requirement, which are identified and described in the attached letter. In accordance with approach no. 4, you have provided an affidavit dated February 29, 2012, that dedicates the 13.5 shares of the Whitney Ditch Company and 96 shares of the Fulton Irrigating Ditch Company described above as replacement water solely for this combined SWSP for as long as there are depletions at these gravel pit sites or until such time as another replacement source is obtained. This dedication supersedes a previous dedication dated January 25, 2011. A copy of the affidavit is attached to this letter. You have also provided an affidavit dated April 23, 2019 that dedicates 5/12ths of the Zweck &t Turner Ditch described above as replacement water solely for the Fredstrom Pit for as long as there are depletions at the gravel pit site or until such time as another replacement source is obtained. For the purposes of this SWSP, these affidavits will be accepted for the dedication of the shares; however, if the State Engineer determines that a different affidavit or dedication process is necessary to assure proper dedication of the shares, additional information may be required prior to future SWSP approvals. A summary of the final reclamation and the approach for compliance with the DRMS letter, including the current posted bond amount, is shown in Table G. Table G- Final Reclamation Summary Site Name Proposed Final Bond DRMS Comments Reclamation Amount Approach No. Jeronimus Pit Backfilled $1,510,800 1, 4 Backfilling of all post-81 areas in progress. Water rights dedicated via February 29 2012 affidavit. The site has been lined with a slurry wall (WDID 0203381). This site has received a full surety Hazeltine Pit Lined Reservoir $0 3 release. Additional SWSPs will be required until the applicant/landowner has replaced all of the remaining tagged depletions. Bonded for lining. The south and central reservoirs Lined are lined with a slurry wall (WDID 0203385) and have Brighton Pit Reservoir/Lakes $150,000 1, 3 obtained SEO liner approval. A bond reduction was approved by DRMS. The applicant is in the process of backfilling the remaining exposed groundwater