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Colona Pit SWSP Page 2 of 13 <br /> September 30, 2025 <br /> 1. Correction of the dates in condition #11 to require dry-up verification on September <br /> 30, 2026 and September 30, 2027 (not September 30, 2025). <br /> 2. Modification of condition #16 to "Any substituted water shall be of a quality and <br /> continuity to meet the requirements of use to which the senior appropriation <br /> receiving the substitute supply has normally been put." <br /> SWSP Operation <br /> The Colona Gravel Pit Operation consists of a gravel mine that will be reclaimed as an <br /> unlined pond. The Applicant operates the gravel pit under well permit no. 77837-F, which <br /> was issued January 17, 2014. Permit no. 77837-F allows an average annual groundwater <br /> appropriation of 55.8 acre-feet, composed of 42.2 acre-feet of evaporative losses from 16.5 <br /> acres of exposed groundwater, 10.3 acre-feet of water removed with the mined product, <br /> and 3.3 acre-feet of water used for dust suppression. <br /> Depletions under this SWSP will consist of evaporative losses from exposed groundwater, <br /> water used for dust control, water filling the pit due to material removal, and water lost <br /> with mined product. <br /> This SWSP previously included land owned in part by the Applicant and in part by another <br /> landowner. The portion of the mine located on land owned by others has been reclaimed <br /> and released by the DRMS as of 2019 (see attached July 11, 2019 letter) and is therefore no <br /> longer subject to this SWSP. <br /> In accordance with the letter dated April 30, 2010 (attached) from the Colorado Division of <br /> Reclamation, Mining, and Safety (DRMS), all sand and gravel mining operators must comply <br /> with the requirements of the Colorado Reclamation Act and the Mineral Rules and <br /> Regulations for the protection of water resources. The April 30, 2010 letter from DRMS <br /> requires that the Applicant provide information to DRMS to demonstrate the ability to <br /> replace long-term injurious stream depletions that result from mining-related exposure of <br /> groundwater. The DRMS letter identifies four (4) approaches to satisfy this requirement. In <br />