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Sievers Pit M-77-098 SWSP, Oldcastle SW Group, Inc. Page 2 of 12 <br /> August 7, 2025 <br /> • Removal of the surface water pond located on the west side of the gravel pit from <br /> surface water evaporation calculations, as the pond is used for operations at the <br /> adjacent golf course community. Under the previous SWSP approval, the Applicant <br /> diverted surface water from the Crystal River via the Kaiser-Sievers Ditch for <br /> temporary storage in a 0.7-acre storage pond before the water was used in an <br /> aggregate wash plant at the site. The storage pond did not expose groundwater. This <br /> pond, now used for the Golf Course's operations, is no longer subject to this SWSP. <br /> In accordance with the letter dated April 30, 2010 (attached) from DRMS, all sand and gravel <br /> mining operators must comply with the requirements of the Colorado Reclamation Act and <br /> the Mineral Rules and Regulations for the protection of water resources. The April 30, 2010 <br /> letter from DRMS requires that you provide information to DRMS to demonstrate you can <br /> replace long-term injurious stream depletions that result from mining related exposure of <br /> groundwater. In accordance with approach no. 1, the Applicant has indicated that a bond has <br /> been obtained for $962,447 through DRMS to assure that depletions from groundwater <br /> evaporation do not occur in the unforeseen event or events that would lead to the <br /> abandonment of the gravel pit. In addition, the Sievers Pit will be backfilled and reclaimed <br /> once mining is complete, thus eliminating any long-term injurious stream depletions related <br /> to exposure of groundwater. <br /> SWSP Operation <br /> The Sievers Pit is located in Section 13, Township 7 South, Range 89 West and Section 18, <br /> Township 7 South, Range 88 West of the 6th P.M., and operated pursuant to an augmentation <br /> plan that was decreed on July 25, 1984 by the Division 5 Water court in case no. 83CW65. <br /> Oldcastle has been mining under DRMS Permit No. M-77-098 since 2013 and has expanded <br /> mining and water uses beyond the decreed amounts outlined in case no. 83CW65. This SWSP <br /> will replace depletions incurred by the expansion only. This SWSP will work in conjunction <br /> with the augmentation plan to replace depletions from 1.9 acres of exposed groundwater <br /> from dewatering trenches and ponds, water lost with mined product, and dust control. <br />