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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, Ft 6243 Page 7 of 37 <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 /> Vrain evaporation, dust control, and dewatering. The site will be dewatered <br /> River) continuously throughout 2025. <br /> Exposed Groundwater Surface: 4.0 acres <br /> Active Dewatering: Yes <br /> Irwin-Thomas Status: Holcim intends to continue actively mining the Irwin-Thomas Pit <br /> Pit during 2025. Water use at this site will consist of dewatering, evaporation <br /> (St. Vrain from exposed groundwater, aggregate production, and dust control. <br /> River) <br /> Exposed Groundwater Surface: 2.5 <br /> Active Dewatering: Yes <br /> W.W. Farms Status: Mining operations at the W.W. Farms Pit (aka Riverview <br /> Pit Resources) are anticipated to be on hold in 2025. Depletions covered by <br /> this SWSP include water lost due to evaporation, dust control, concrete <br /> (Lower batching, past aggregate production, and past dewatering. During the <br /> Poudre River) spring of 2011 the pit was flooded by the Poudre River due to the high <br /> spring runoff conditions. Ongoing dewatering has reduced the exposed <br /> surface area at the site. The entire remaining exposed surface area will <br /> be assessed evaporative losses as this is an unlined pit. Note: The <br /> Applicant has obtained a decreed plan for augmentation in water court <br /> case no. 1990CW23 to cover evaporation from up to 66 acres of exposed <br /> water surface area in one or more unlined ponds remaining at the site <br /> post-mining; however, since final reclamation of the site has not yet <br />