2024-03-25_HYDROLOGY - M2023033 - Laserfiche WebLink

Home Browse Search

Ewing Gravel Mine Substitute Water Supply Plan Page 4 of 7 March 25, 2024 The Hite Treatment Facility is located approximately 26 miles upstream of the Pit. The delivery schedule includes a transit loss of 0.5% per mile (13% for 26 miles) during the months of April through September and 0.25% per mile (6.5% for 26 miles) during the months of October through March. Conveyance loss for delivery of augmentation water to the South Platte River is subject to assessment and modification as determined by the Division Engineer. Total replacements during this SWSP period from the City of Aurora are 96.89 acre-feet. A summary of lagged depletions and replacements are provided on the attached lease. Long-Term Augmentation In accordance with the letter dated April 30, 2010 (attached) from the Colorado Division of Reclamation, Mining, and Safety ("DRMS"), all sand and gravel mining operators must comply with the requirements of the Colorado Reclamation Act and the Mineral Rules and Regulations for the protection of water resources. The April 30, 2010 letter from DRMS requires that the Applicant provide information to DRMS to demonstrate the ability to replace long term injurious stream depletions that result from mining related exposure of groundwater. The DRMS letter identifies four approaches to satisfy this requirement. In accordance with approach nos. 1 and 3, the Applicant has obtained a bond for $4,280,500 through the DRMS for complete reclamation of the site which, according to the DRMS permit, will require a complete backfill of the site. Conditions of Approval This SWSP is hereby approved in accordance with section 37-90-137(11), C.R.S., subject to the following conditions: 1. This SWSP shall be valid for the period of May 1, 2024 through December 31, 2025, unless otherwise revoked, or superseded by decree. A SWSP renewal request must be submitted to this office with the statutory fee (currently $257) by September 1, 2025. If a renewal request is received after the March 1, 2024 date, this plan may be considered a request for a new SWSP and the $1,593 filing fee will apply. 2. A well permit must be obtained for this pit in accordance with sections 37-90-137(2) and (11), C.R.S. prior to the exposure or use of groundwater. Well permit application (receipt no. 10033982) was submitted on January 26, 2024 and this application is pending evaluation. The provisions of section 37-90-137(2), C.R.S., prohibit the issuance of a permit for a well to be located within 600 feet of any existing well, unless the State Engineer finds that circumstances so warrant after a hearing held in accordance with the procedural rules in 2 CCR 402-5. This hearing may be waived if you are able to obtain statements from the owners of all wells within 600 feet, verifying that they have no objection to your use of the proposed well. Should a new well permit be denied for reasons of 600 foot spacing, or any other legitimate reason, approval of this substitute water supply plan will be canceled. 3. The total surface area of the groundwater exposed at the site during the period of this SWSP must not exceed the amounts shown on attached Table 1.