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Morton Lakes Substitute Water Supply Plan Renewal Page 2 of 9 <br /> December 16, 2022 <br /> fill of Stage 2 from the stream will not result in lagged depletions. Depletions from this stage result <br /> from washing/dust control, evaporation, and storage (re-fill). <br /> • Stage 3 - Mining at Stage 3 was completed in early 2018. Stage 3 was completely backfilled in the <br /> spring of 2019 with overburden from other stages. No remaining lagged depletions are associated <br /> with this Stage (which includes what was previously called Stage 313). <br /> • Stage 4 - Mining at Stage 4 was completed in the spring of 2021. A slurry wall was constructed <br /> around Stage 4 and a 90-day leak test was approved on May 23, 2018. Brannan completed the final <br /> construction to convert Stage 4 into its intended and approved post-mining reservoir storage use in <br /> 2021, and on July 1, 2021 the structure was transferred to United Water. Brannan is no longer <br /> responsible for Stage 4, and any lagged depletions from previous mining of this stage and new <br /> depletions associated with future use at Stage 4 are not included in this SWSP renewal request. <br /> • Stage 5 - A slurry wall was constructed in July 2020 for Stage 5 and mining began at the end of 2020. <br /> The surface area of Stage 5 will increase from 0.6 to 1 acre during 2023 and is lined. Depletions <br /> from this stage result from evaporation, dewatering, and gravel production. <br /> • Stage 6A - Mining at Stage 6A was completed mid-2017. The exposed groundwater surface area of <br /> Stage 6A will increase from 0.1 to 0.2 acre during 2023 and is lined. Depletions from this stage <br /> consist of evaporation only. <br /> • Stage 6B - Mining at Stage 6B was completed in March of 2018. The exposed groundwater surface <br /> area of Stage 6B is 0.2 acres and is lined. Depletions from this stage consist of evaporation only. <br /> • Stage 6C - Mining at Stage 6C began in 2019. Stage 6C will be backfilled at the beginning of 2023 <br /> and delayed dewatering depletions will be replaced under this plan. No new depletions are <br /> anticipated from this stage. <br /> • Stage 6D -Mining at Stage 6D began in 2019 following the installation of the slurry wall. The exposed <br /> groundwater surface area of Stage 6D is 2 acres, including the existing settling ponds. Depletions <br /> from this stage will consist of evaporation, dewatering, and gravel production. <br /> • Stage 6E - Mining is not anticipated to occur in Stage 6E during 2023, however drainage channels <br /> and a sump will be installed in the area therefore conservatively the estimated exposed groundwater <br /> surface area is 0.2 acres during 2023. Depletions from this stage consist of evaporation only. <br /> • Stage 7A - Mining at State 7A is anticipated to begin in 2023, following the planned completion of a <br /> slurry wall within Stage 7A. The exposed groundwater surface area of Stage 7A will increase from <br /> 0.5 to 1 acre during 2023. Water will be used for the construction of the slurry wall at Stage 7A. <br /> Depletions from this stage will consist of evaporation, dewatering, gravel production, and slurry <br /> wall construction. <br /> • Stage 7B - Mining is not anticipated to occur in Stage 7B during 2023. No exposed surface water will <br /> occur in Stage 7B during 2023. <br /> In accordance with the letter dated April 30, 2010 (copy attached) from the Colorado Division of <br /> Reclamation, Mining, and Safety ("DRMS"), all sand and gravel mining operators must comply with the <br /> requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the protection of <br /> water resources. The April 30, 2010 letter from DRMS requires that you provide information to DRMS to <br />