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Colona Pit SWSP Page 2 of 13 <br /> September 10, 2025 <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, and <br /> 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 and <br /> released by the DRMS as of 2019 (see attached July 11, 2019 letter) and is therefore no <br /> longer subject to this SWSR <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 /> accordance with approach no. 1, the Applicant has indicated that a bond has been obtained <br /> for $165,351 .00 through the DRMS. <br /> Additionally, in accordance with approach no. 4, the Applicant has provided an affidavit <br /> dated May 23, 2011 that dedicates 1 .0 share of Ouray Ditch water as replacement water <br /> solely for use under this SWSP and for as long as there are depletions at this gravel pit site or <br /> until such time as another replacement source is obtained. A copy of the affidavit is <br />