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2025-04-14_HYDROLOGY - M1977436
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2025-04-14_HYDROLOGY - M1977436
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Last modified
4/16/2025 11:17:59 AM
Creation date
4/16/2025 10:37:35 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1977436
IBM Index Class Name
Hydrology
Doc Date
4/14/2025
Doc Name
Substitute Water Supply Plan
From
Division of Water Resources
To
DRMS
Email Name
NCG
JLE
Media Type
D
Archive
No
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Holcim South Platte Combined SWSP April 14, 2025 <br /> Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, &t 6243 Page 4 of 37 <br /> SWSP in 2019 and was incorporated into this SWSP starting in the 2020 plan period. Holcim <br /> never began mining at that site and no longer intends to mine it and this pit is no longer <br /> included in this SWSP. <br /> The Irwin-Thomas Pit (Plan ID 5829, WDID 0505626) operated under an individual SWSP in <br /> 2019 and was incorporated into this SWSP starting in the 2020 plan period. The DPG Pit (Plan <br /> ID 6243, WDID 0307924) operated under an individual SWSP in 2022 and 2023 and was <br /> incorporated into this SWSP starting in the 2024 plan period. A summary of the mining <br /> operations at each of the twelve (12) sites included in this SWSP is provided below. <br /> Jeronimus Pit Status: Resource extraction at the Jeronimus Pit is complete. Operations <br /> on-site include backfilling of the pit with inert fill. Depletions covered by <br /> (South Platte this SWSP are limited to water lost due to evaporation. The total surface <br /> Mainstem) area exposed at the site is 19.2 acres, of which 14.7 acres were exposed <br /> to the atmosphere prior to January 1, 1981 ("pre-1981"). The 14.7-acre <br /> area exposed at the Jeronimus Pit prior to 1981 is tied to the location as <br /> shown on the exhibit dated January 31, 2011 as provided in the 2011 <br /> SWSP. The credits for the pre-1981 area are tied to the location identified <br /> on that map and may not be re-allocated to other areas of groundwater <br /> exposure within the gravel pit permit boundary. <br /> Exposed Groundwater Surface: 4.5 acres post-81, 14.7 acres pre-81 <br /> Active Dewatering: No <br /> Hazeltine Pit Status: Resource extraction at the Hazeltine Pit has been completed and <br /> reclamation is in progress. The Hazeltine Pit was lined with a soil <br /> (South Platte bentonite slurry wall, and was approved as having been lined to the <br /> Mainstem) design standard referenced in the August 1999 State Engineer Guidelines <br /> for Lining Criteria for Gravel Pits in a letter dated May 25, 2016. The <br /> construction of the slurry wall resulted in groundwater mounding and <br /> flooding of adjacent property. The operator has installed a gravity drain <br /> to dewater the site on a continuous basis. A 45-day leak test was <br /> performed after installation of the permanent drain to verify that the <br /> liner was not impacted. The liner was re-approved in a letter dated March <br /> 22, 2018. The Applicant was required to install and operate the Orr Drain <br /> to reduce mounding of groundwater associated with the installation of the <br /> slurry wall at the site. According to the Applicant, the Orr Drain must <br /> continue to operate until the DRMS Permit is released. The Orr Drain <br /> currently intercepts groundwater seepage and surface flow in the Bull <br /> Seep, which are routed into the lined pit and subsequently pumped out to <br /> the Bull Seep and discharged to the South Platte River; the monthly <br />
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