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Holcim South Platte Combined SWSP June 18, 2024 <br /> Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, Ft 6243 Page 5 of 26 <br /> water supply for a portable ready-mixed plant located at the site for a <br /> short-term job. Depletions covered by this SWSP include water used for dust <br /> control and lagged depletions from past concrete batching, past dewatering, and <br /> past aggregate production. Dewatering at the site ceased due to flooding in <br /> September 2013, and Holcim currently has no plans to reactivate dewatering. <br /> The City of Longmont has assumed the augmentation responsibilities for lagged <br /> and future depletions from evaporation and consumptive use by wetlands <br /> vegetation at the site under their plan for augmentation decreed in case no. <br /> 2009CW271. <br /> Exposed Groundwater Surface: N/A (augmented under case no. 2009CW271) <br /> Active Dewatering: No <br /> Tull Pit Status: Mining operations are anticipated to be on hold at the Tull Pit in 2024. <br /> (St. Wain River) Depletions covered by this SWSP include water lost due to evaporation, dust <br /> control, and dewatering. The site will be dewatered continuously throughout <br /> 2024. <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 during <br /> Pit 2024. Water use at this site will consist of dewatering, evaporation from exposed <br /> (St. Wain River) groundwater, aggregate production, and dust control. <br /> Exposed Groundwater Surface: 1.0 <br /> Active Dewatering: Yes <br /> W.W. Farms Pit Status: Mining operations at the W.W. Farms Pit (aka Riverview Resources) are <br /> (Lower Poudre anticipated to be on hold in 2024. Depletions covered by this SWSP include water <br /> River) lost due to evaporation,dust control, concrete batching, past aggregate <br /> production, and past dewatering. During the spring of 2011 the pit was flooded <br /> by the Poudre River due to the high spring runoff conditions. Ongoing dewatering <br /> has reduced the exposed surface area at the site. The entire remaining exposed <br /> surface area will be assessed evaporative losses as this is an unlined pit. Note: <br /> The Applicant has obtained a decreed plan for augmentation in water court case <br /> no. 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 post-mining; <br /> however, since final reclamation of the site has not yet occurred, all depletions <br /> from this pit will continue to be replaced under this SWSP during this plan <br /> 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 reclamation is in <br /> (Lower Poudre progress. Depletions covered by this SWSP are limited to water lost due to <br /> River) evaporation, as lagged dewatering and operational depletions are no longer <br /> accruing to the river. <br /> Exposed Groundwater Surface: 37.2 acres <br /> Active Dewatering: No <br />