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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 5 of 37 <br /> difference between what is measured entering the pit and what is <br /> measured being pumped out is considered a depletion. Responsibilities for <br /> the Orr Drain have transferred over to the City of Thornton and will be <br /> included in their plan for augmentation decreed in case no. 18CW3158. <br /> January 2023 was the last month that depletions due to the Orr Drain <br /> were replaced under this SWSR <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 />