2021-06-01_HYDROLOGY - M1977436 - Laserfiche WebLink

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Aggregate Industries South Platte Combined SWSP June 1, 2021 Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, 8t 6090 Page 5 of 23 Fredstrom Pit Status: Mining operations are anticipated to be on hold at the Fredstrom Pit in (St. Wain River) 2021. There is no anticipated water use at this site in 2021. Depletions covered by this SWSP include lagged depletions from past activities. Exposed Groundwater Surface: 0 acres Active Dewatering: No W.W. Farms Pit Status: Mining operations at the W.W. Farms Pit (aka Riverview Resources) are (Lower Poudre anticipated to continue in 2021. Depletions covered by this SWSP include water River) lost due to evaporation, aggregate production, dust control, and dewatering. During the spring of 2011 the pit was flooded by the Poudre River due to the high spring runoff conditions. Ongoing dewatering has reduced the exposed surface area at the site. The entire remaining exposed surface area will be assessed evaporative losses as this is an unlined pit. The site will be dewatered continuously throughout 2021. Note: The Applicant has obtained a decreed plan for augmentation in water court case no. 1990CW23 to cover evaporation from up to 66 acres of exposed water surface area in one or more unlined ponds remaining at the site post mining; however, since final reclamation of the site has not yet occurred, all depletions from this pit will continue to be replaced under this SWSP during this plan period. Exposed Groundwater Surface: 64.0 acres Active Dewatering: Yes F-Street Pit Status: Resource extraction at the F-Street Pit is complete and reclamation is in (Lower Poudre progress. Depletions covered by this SWSP are limited to water lost due to River) evaporation, as lagged dewatering and operational depletions are no longer accruing to the river. Exposed Groundwater Surface: 26.2 acres Active Dewatering: No