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Holcim South Platte Combined SWSP September 18, 2025 <br /> Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, &t 6243 Page 5 of 37 <br /> were replaced under this SWSP. <br /> Exposed Groundwater Surface: None <br /> Active Dewatering: No <br /> Brighton Pit Status: Resource extraction at the Brighton Pit is complete and <br /> reclamation is in progress. Depletions covered by this SWSP include water <br /> (South Platte lost due to evaporation and post-pumping dewatering depletions. The <br /> Mainstem) south and central reservoirs are lined with a slurry wall (WDIDs 0203031 <br /> and 0203385) and have obtained SEO liner approval. Reclamation work <br /> includes backfilling the remaining exposed areas, of which 2.0 acres was <br /> backfilled in 2020. Mining operations will not be considered to have <br /> ceased until the backfilling is complete. <br /> Exposed Groundwater Surface: 1.0 acres <br /> Active Dewatering: No <br /> Tucson South Status: Holcim intends to continue actively mining the Tucson South Pit <br /> Pit during 2025. Depletions covered by this SWSP include water lost due to <br /> evaporation, aggregate production, slurry wall construction, landscape <br /> (South Platte irrigation, and dust control. <br /> Mainstem) <br /> Exposed Groundwater Surface: 3.0 acres (including 2.0 acres transferred <br /> from the Tucson Pit) <br /> Active Dewatering: No <br /> Wattenberg Status: Resource extraction at the Wattenberg Pit is complete and <br /> Pit reclamation is in progress. Depletions covered by this SWSP include water <br /> lost due to evaporation, and dewatering. Prior to 2018, the north pit was <br /> (South Platte dewatered with water delivered to the nearby Broda Pond. The north cell <br /> Mainstem) has since been lined, and dewatering operations have shifted to the south <br /> cell with water to be discharged to multiple locations. A portion of the <br /> water will be pumped to the Stillwater Ski Lake located south of the pit to <br /> mitigate lower levels in the pond due to the suppressed water table <br /> resulting from dewatering. A portion of the water may be pumped to a <br /> new recharge pond on the west side of the site in order to mitigate low <br /> water table levels in domestic wells in the area. A portion of the water <br /> may be discharged to the Huett Seep, a surface drainage adjacent to the <br /> site. The remainder of the dewatering discharge will be pumped across <br /> the South Platte River to the Broda Pond located within the Platte Valley <br /> Pit. Once water enters the Broda Pond, some is pumped to the river to <br />