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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, Ft 6243 Page 7 of 37 <br /> Rules. The Applicant submitted the attached "Figure 1— Platte Valley Pit <br /> 2021 Exposed Area" for verification of the area that has been exposed <br /> starting in 2019. <br /> Exposed Groundwater Surface: 56.0 acres <br /> Active Dewatering: No <br /> DPG Pit Status: Mining operations are anticipated to continue at the DPG Pit in <br /> (South Platte 2025. Water use at this site will consist of evaporation from exposed <br /> Mainstem) groundwater, aggregate production, and dust control. <br /> Exposed Groundwater Surface: 16.0 <br /> Active Dewatering: Yes <br /> Distel Pit Status: Mining operations at the Distel Pit were completed in 2011 and <br /> reclamation is in progress. In 2017, Holcim used water from the Distel site <br /> River) <br /> Wain reclamation <br /> a water supply for a portable ready-mixed plant located at the site for <br /> River) a short-term job. Depletions covered by this SWSP include water used for <br /> dust control. Lagged depletions from past concrete batching, past <br /> dewatering, and past aggregate production have been replaced. <br /> Dewatering at the site ceased due to flooding in September 2013, and <br /> Holcim currently has no plans to reactivate dewatering. The City of <br /> Longmont has assumed the augmentation responsibilities for lagged and <br /> future depletions from evaporation and consumptive use by wetlands <br /> vegetation at the site under their plan for augmentation decreed in case <br /> no. 2009CW271. <br /> Exposed Groundwater Surface: N/A (augmented under case no. <br /> 2009CW271) <br /> Active Dewatering: No <br /> Tull Pit Status: Mining operations are anticipated to be on hold at the Tull Pit in <br /> 2025. Depletions covered by this SWSP include water lost due to <br /> River) <br /> Wain 2025. <br /> dust control, and dewatering. The site will be dewatered <br /> River) continuously throughout 2025. A new well permit must be obtained <br /> before the water from this pit can be used for more than 2 acre-feet of <br /> dust control. <br /> Exposed Groundwater Surface: 4.0 acres <br /> Active Dewatering: Yes <br />