2022-05-16_HYDROLOGY - M2018053 - Laserfiche WebLink

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Ms. Katie Todt January 10, 2022 Page 3 of 5 A Glover analysis was performed with the following parameters to determine lagged depletions: Transmissivity: 119,276 gpd/ft Specific Yield: 0.24 Distance to River: 1,725 feet Distance to aquifer boundary: 2,542 feet Monthly groundwater lagged depletions were calculated using the Alluvial Water Accounting System ("AWAS") developed by the Integrated Decision Support ("IDS") Group at Colorado State University. Aquifer dimensions and distance to the stream were measured using Google Earth imagery. Previous placer mining has severely modified the area, resulting in difficulties identifying surface water pathways; however, the applicant and DWR's Hydrogeology staff agreed that an orthogonal line from the well to the aquifer boundary is the most appropriate method of determining the depletions at the site (see attached map). REPLACEMENTS Titan has leased 22 acre-feet of fully consumable water from the Pueblo Board of Water Works ("PBWW") and will use this leased water as the source of replacement water through April 30, 2022 for the two SWSP operations at the Box Creek Placer. A copy of the lease and the revised lease have been provided and copies are attached to this letter. CONDITIONS OF APPROVAL This SWSP is hereby approved pursuant to § 37-92-308(5), C.R.S., subject to the following conditions: 1. This SWSP shall be valid for the period of June 1, 2021 through April 30, 2022 unless otherwise revoked or superseded by decree. This SWSP may be extended to May 31, 2022 if a lease for replacement water through May 31, 2022 is obtained as described in Condition of Approval #3. Should an additional SWSP be requested, the provisions of § 37-92-308(5)(b), C.R.S., shall apply. The statutory fee of $300 will be required pursuant to § 37-92-308(8), C.R.S. Any request for an additional SWSP must be submitted to this office no later than March 11 2022. 2. In accordance with 537-92-308(5), C.R.S., this SWSP cannot be renewed or approved for more than five years and the depletions associated with the proposed water uses must not exceed five years. This is the second year of approval for this SWSP. 3. The current supply of replacement water expires on April 30, 2022. Subject to approval by the Division Engineer, if the Applicant leases or purchases replacement water from the sources approved in this SWSP for the time period after April 30, 2022, this SWSP may be extended until May 31, 2022 or the expiration of the lease, whichever occurs first. The Applicant must provide a copy of a lease/purchase agreement to the State Engineer's Office and the Division Engineer for use of such additional replacement water, no later than March 1, 2022. 4. The total groundwater depletions at the Box Creek Placer Mine South Plant site must not exceed 10.32 acre-feet, including transit losses from any releases from upstream reservoirs, during the SWSP period. Total consumption must not exceed the aforementioned amounts unless a new SWSP application is made and approved for such.