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Peter Foster and Jonah Howe, Wright Water Engineers Page 2 of 14 <br /> Re: Gunnison West Gravel Pit SWSP, Amendment No. 1 <br /> December 12, 2025 <br /> This SWSP was previously approved on December 8, 2025. This approval amends <br /> condition of approval #7 so as to require accounting to be submitted within ten (10) <br /> calendar days of the end of the month for which the accounting is being made during <br /> times of stream administration (as opposed to the previously required five (5) calendar <br /> days). <br /> The Gunnison West gravel pits are located in Sections 10, 11, and 15, Township 49 North, <br /> Range 1 West of the New Mexico P.M., as shown on attached Figure 2. The depletions that <br /> result from the mining operation over the two-year period include evaporation from exposed <br /> groundwater, product moisture loss and washing, dewatering, and dust suppression. The <br /> total amount of groundwater proposed to be exposed during the term of this SWSP is 40.1 <br /> acres. Dry-up credits from lands historically irrigated by the Seventy-Five Ditch will be used <br /> to offset the associated water depletions. <br /> This gravel pit operates under permit no. 77574-F, which limits the use of groundwater to <br /> evaporative loss, water lost with mined product, dust control, and dewatering, with average <br /> annual amount of groundwater to be appropriated limited to 318.03 acre-feet/year based on <br /> an exposed groundwater area of 124 acres (including 12 acres exposed prior to January 1, <br /> 1981), or the amounts covered under a Water Court-approved augmentation plan or SWSP <br /> approved by the State Engineer, whichever is less. <br /> Depletions <br /> Annual depletions are as follows: <br /> 1. 17.4 acre-feet/year of evaporative depletions, <br /> 2. 1.3 acre-feet/year for dust suppression, and <br /> 3. 2.9 acre-feet/year from aggregate production and washing. <br /> Therefore, total depletions are anticipated at 21.7 acre-feet/year, as shown on attached <br /> Table 2. <br />