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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 8 of 37 <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. Wain 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 Resources) <br /> Pit are anticipated to be on hold in 2025. Depletions covered by this SWSP <br /> include water lost due to evaporation, dust control, concrete batching, <br /> (Lower Poudre River) past aggregate production, and <br /> past dewatering. During the spring of 2011 <br /> the pit was flooded by the Poudre River due to the high spring runoff <br /> conditions. Ongoing dewatering has reduced the exposed surface area at <br /> the site. The entire remaining exposed surface area will be assessed <br /> evaporative losses as this is an unlined pit. Note: The Applicant has <br /> obtained a decreed plan for augmentation in water court case no. <br /> 1990CW23 to cover evaporation from up to 66 acres of exposed water <br /> 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 /> occurred, all depletions from this pit will continue to be replaced under <br /> this SWSP during this plan period. <br /> Exposed Groundwater Surface: 64.0 acres <br /> Active Dewatering: Yes <br /> F-Street Pit Status: Resource extraction at the F-Street Pit is complete and <br /> reclamation is in progress. Depletions covered by this SWSP are limited to <br /> (Lower water lost due to evaporation, as lagged dewatering and operational <br /> Poudre River) depletions are no longer accruing to the river. <br /> Exposed Groundwater Surface: 37.2 acres <br /> Active Dewatering: No <br />