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Aggregate Industries South Platte Combined SWSP January 30, 2019  <br />Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, and 5475 Page 4 of 21  <br /> <br />temporary cessation of dewatering in January 2018. The site will be  <br />dewatered continuously throughout 2019. <br />Exposed Groundwater Surface:​ 5.0 acres <br />Active Dewatering:​ YES <br />Platte Valley Pit <br />(South Platte  <br />Mainstem) <br />Status: ​Mining operations at the Platte Valley Pit are not anticipated to  <br />occur in 2019, though reclamation activity consisting of backfilling  <br />portions of the site will continue in 2019. Depletions covered by this  <br />SWSP include water lost due to evaporation, dust control, and concrete  <br />batching. Water for concrete batching will come from Well Permit No.  <br />13410-F-R (WDID 0207073). Note that the water right for this well was on  <br />the division engineer’s 2010 Decennial Abandonment List, but the well  <br />may still be used in accordance with its permit as long as all depletions  <br />are treated as junior to all other vested water rights in accordance to  <br />this SWSP and the well complies with the South Platte Well Measurement  <br />Rules. <br />Exposed Groundwater Surface:​ 60.0 acres <br />Active Dewatering:​ No  <br />Distel Pit <br />(St. Vrain River) <br />Status: ​Mining operations at the Distel Pit were completed in 2011 and  <br />reclamation is in progress. In 2017, Aggregate used water from the Distel  <br />site as a water supply for a portable ready-mixed plant located at the  <br />site for a short-term job. Depletions covered by this SWSP include water  <br />used for dust control, and lagged depletions from past concrete batching  <br />and past aggregate production, and post-pumping depletions from past  <br />dewatering. Dewatering at the site ceased due to flooding in September  <br />2013, and Aggregate currently has no plans to reactivate dewatering.  <br />The City of Longmont has assumed the augmentation responsibilities for  <br />lagged and future depletions from evaporation and consumptive use by  <br />wetlands vegetation at the site under their plan for augmentation  <br />decreed in case no. 2009CW271.  <br />Exposed Groundwater Surface:​ N/A (augmented under case no.  <br />2009CW271) <br />Active Dewatering:​ No <br />Tull Pit <br />(St. Vrain River) <br />Status: ​Mining operations are anticipated to continue at the Tull Pit in  <br />2019. Depletions covered by this SWSP include water lost due to  <br />evaporation, dust control, aggregate production, and dewatering. The  <br />site will be dewatered continuously throughout 2019. <br />Exposed Groundwater Surface: ​1.0 acre <br />Active Dewatering:​ YES <br />W.W. Farms Pit <br />(Lower Poudre River) <br />Status: ​Mining operations at the W.W. Farms Pit (aka Riverview  <br />Resources) are anticipated to continue in 2019. Depletions covered by  <br />this SWSP include water lost due to evaporation, aggregate production,  <br />dust control, and dewatering. During Spring of 2011 the pit was flooded  <br />by the Poudre River due to the high spring runoff conditions. Ongoing  <br />dewatering has reduced the exposed surface area at the site. The entire  <br />remaining exposed surface area will be assessed evaporative losses as  <br />this is an unlined pit. The site will be dewatered continuously