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Morton Lakes Substitute Water Supply Plan Renewal <br /> January 10, 2025 <br /> Page 3 of 14 <br /> During heavy rains in Spring 2023, Stage 5 intercepted a substantial amount of surface <br /> water from Big Dry Creek. Brannan reported that the additional water was pumped <br /> out of this stage as quickly as possible. Mining at Stage 5 was anticipated to be <br /> completed by the end of 2024. Stage 5 will be converted to a reservoir for post- <br /> mining water storage sometime in the first half of 2025. The surface area of Stage 5 <br /> will remain at 1 acre during 2025. For the Stage 5 structure to be approved as a <br /> reservoir capable of post-mining water storage, the operator must perform a final <br /> leak test once mining is complete, and the site is at final _grade. Depletions from this <br /> stage result from evaporation, dewatering, and gravel production. <br /> • Stage 6A - Mining at Stage 6A was completed mid-2017. The exposed groundwater <br /> surface area of Stage 6A is 1 acre and is lined. A 90-day leak test for this stage <br /> together with Stage 6B and 6D was provisionally approved on November 4, 2019. <br /> Depletions from this stage consist of evaporation only. <br /> • Stage 6B - Mining at Stage 6B was completed in March of 2018. The exposed <br /> groundwater surface area of Stage 6B will remain at 1 acre during 2025 and is lined. <br /> Depletions from this stage consist of evaporation only. <br /> • Stage 6C - Mining at Stage 6C began in 2019. Stage 6C was backfilled at the end of <br /> 2022. <br /> • Stage 6D - Mining at Stage 6D began in 2019 following the installation of the slurry <br /> wall. The exposed groundwater surface area of Stage 6D will decrease from 3.5 to 2 <br /> acres during 2025 and is lined. Depletions from this stage will consist of evaporation, <br /> dewatering, and gravel production. <br /> • Stage 6E - Mining is not anticipated to occur in Stage 6E during 2025, and no surface <br /> area is anticipated to be exposed during that time. <br /> • Stage 7A - Mining at Stage 7A began in 2023, following the planned completion of a <br /> slurry wall in Stage 7A. A 90-day leak test for this stage was provisionally approved on <br /> October 17, 2023. The exposed groundwater surface area of Stage 7A is currently 0.1 <br /> acres and is not expected to expose more than 1 acre. Depletions from this stage will <br /> consist of evaporation, dewatering, and gravel production. <br /> • Stage 7B - Mining at Stage 7B began in 2023, and is planned to continue during the <br /> renewal request period. Stage 7B is lined and currently exposes 0.1 acres of ground <br /> water. The surface area exposed during 2025 is not anticipated to be more than 1 <br />