2019-01-30_HYDROLOGY - M2004031 - Laserfiche WebLink

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Aggregate Industries South Platte Combined SWSP January 30, 2019 Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, and 5475 Page 15 of 21 Dewatering 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, and the Tucson South 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. For the purposes of this SWSP, this affidavit 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. The bond posted for the F-Street pit was found to be inadequate during a site inspection by DRMS on February 10, 2012. The bond was increased from $71,404 to $10,237,994 effective January 17, 2018. A summary of the final reclamation and the compliance approach to the DRMS letter including the current posted bond amount is shown in Table E. Table E – Final Reclamation Summary Site Name Proposed Final Reclamation Bond Amount DRMS Approach No. Comments Jeronimus Pit Backfilled $1,510,800 1, 4 Backfilling of all post-81 areas in progress. Water rights dedicated via February 29, 2012 affidavit. Hazeltine Pit Lined Reservoir $670,602 3 Bonded for lining. The site has been lined with a slurry wall (WDID 0203381). Brighton Pit Lined Reservoir/Lakes $150,000 1, 3 Bonded for lining. The south and central reservoirs are lined with a slurry wall (WDID 0203385) and have obtained SEO liner approval. A bond reduction was approved by DRMS. Tucson South Pit Lined Reservoir $326,040 3 Bond increased to cover backfilling of existing 2.0-acre pond. Wattenberg Pit Lined Reservoir $520,000 3 Bonded for lining. (Pit lined in 2013; however, liner has not yet been tested or approved.)