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COLORADO <br /> 60 <br /> Division of Water Resources <br /> Department of Naturai Resources <br /> August 30, 2023 <br /> Chris Newton, Hydrogeologist <br /> Dinatale Water Consultants <br /> 5777 Central Avenue, Suite 228 <br /> Boulder, CO 80301 <br /> Re: Nix Gravel Pit Substitute Water Supply Plan (WDID 0502540) <br /> DRMS File No. M-2001-046(WDID 0505632) <br /> E1/2 and S1/2 of the SW1/4 of Section 28, T3N, R67W of the 6th P.M. <br /> Water Division 1, Water Districts 2 and 5, Weld County <br /> SWSP ID: 9339 <br /> Approval Period: July 1, 2023 through June 30, 2024 <br /> Contact information for Chris Newton: 303-709-7044 and chris@dinatalewater.com <br /> Dear Chris Newton: <br /> This letter is in response to your application received on April 28, 2023 and the additional <br /> information from August 2, 2023 requesting a substitute water supply plan ("SWSP") for a sand <br /> and gravel pit in accordance with § 37-90-137(11), C.R.S., for the Nix Gravel Pit, Division of <br /> Reclamation Mining and Safety ("DRMS") File No. M-2001-046, operated by Ready Mixed Concrete <br /> Company ("RMCC" or "Applicant") and leased to Dixie Water, LLC ("Dixie"). The Applicant shall <br /> be responsible for compliance with this SWSP, but the State Engineer's Office may also pursue the <br /> landowner for eventual compliance. The required fee of $257 for the SWSP renewal has been paid <br /> (receipt no. 10028834). <br /> SWSP Operations <br /> The Nix Gravel Pit is located in the E 'h and the S 'h of the SW'/a of Section 28, Township 3 North, <br /> Range 67 West in the 6th P.M. The total permitted area is 307.2 acres and is anticipated to <br /> include up to five mining cells (known as Cells 2-6), an overflow pond, and a freshwater pond, as <br /> shown on attached Figure 3. RMCC anticipates commencing mining in July 2023 and plans on <br /> extracting an average of approximately 1 to 1.5 million tons of aggregate per year. It is <br /> anticipated that mining will continue for approximately 11 'h to 16 years and will occur in five <br /> stages. Stage 1 is expected to take approximately one to one and a half years and mining will <br /> occur within Cell 1A. During stage 1 groundwater will be exposed within the overflow and <br /> freshwater ponds, which will remain in operation for the duration of the mining operation of all <br /> stages. Once the overflow and freshwater ponds are unable to contain the full infiltration volume, <br /> a recharge pond will also be constructed. Stage 2 is expected to take approximately five to seven <br /> years and mining will begin in the summer of 2024 within Cells 2 and 3. Stage 3 is expected to <br /> take approximately four to five years and mining will begin within Cells 4 and 5. Stage 4 is <br /> expected to take approximately one year and mining will begin within Cell 1 B, once Cells 4 and 5 <br /> have been mined to completion. Stage 5 is expected to take approximately one to two years and <br /> mining will begin within Cell 6. The mining plan is shown in Figure 2. <br /> Prior to mining, slurry walls will be constructed around Cells 2-6 which will be reclaimed as lined <br /> storage facilities. The slurry wall around Cells 2 and 3 will be constructed in 2023 and <br /> Off'C01Q�1313 Sherman Street, Room 821, Denver, CO 80203 P 303.866.3581 dwr.colorado.gov <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Kevin G. Rein, State Engineer/Director I y <br /> f 1876{` <br />