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Morton Lakes Substitute Water Supply Plan Renewal <br /> January 10, 2025 <br /> Page 2 of 14 <br /> SWSP Operations <br /> The Morton-Holton Lakes Mine is located in the SE '/ of Section 1 and the NE '/a of Section <br /> 12, all in Township 1 North, Range 67 West of the 6t" P.M., and the SW '/ of Section 6 and <br /> the NW '/a of Section 7, all in Township 1 North, Range 66 West of the 6t" P.M. The depletions <br /> that result from the mining operation over the period of this SWSP include evaporation from <br /> exposed groundwater, dewatering, water used to wash mined product, dust suppression, and <br /> reservoir construction water at Stage 5. The replacement of depletions for Morton-Holton <br /> site is fully consumable water leased from the City of Aurora. <br /> Mining of the Morton Lakes site is presently expected/projected to last until at least 2026. <br /> The current mining plan for the site is shown in attached Figure 1. The mining status of the <br /> Stages is described below: <br /> • Stage 1 - Mining at Stage 1 was completed in July 2016. Stage 1 currently exposes 11 <br /> acres of groundwater and is unlined. Depletions from this stage consist of evaporation <br /> on ly. <br /> • Stage 2 - Mining at Stage 2 was completed in 2016. Stage 2 currently exposes 15 acres <br /> of groundwater and is unlined. Depletions from this stage consist of evaporation only. <br /> • Stage 3 - Mining at Stage 3 was completed in early 2018. Stage 3 was completely <br /> backfilled in the spring of 2019 with overburden from other stages. There are no <br /> remaining lagged depletions associated with this Stage that need to be replaced <br /> (which includes what was previously called Stage 3B). <br /> • Stage 4 - Mining at Stage 4 was completed in the spring of 2021. A slurry wall was <br /> constructed around Stage 4 and a 90-day leak test was provisionally approved on May <br /> 23, 2018. Brannan completed the final construction to convert Stage 4 into its <br /> intended and approved post-mining reservoir storage use in 2021, and the final leak <br /> test was approved on May 24, 2021. On July 1, 2021 the structure was transferred to <br /> United Water. Brannan is no longer responsible for Stage 4, and any lagged depletions <br /> from previous mining of this stage and new depletions associated with future use at <br /> 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 <br /> the end of 2020. A 90-day leak test was provisionally approved on January 5, 2021. <br />