2023-10-03_REVISION - M1977344 (32)

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Mr. Kevin Rein Office of the State Engineer Page 3 Dust Suppression Use/Consumed Sanitary Use Sanitary Consumed Total Water Consumed from Wells Dec 1.25 0.17 0.02 1.27 Total 35.00 2.00 0.20 35.20 Timing of Depletions Based on the fact that Red Creek is a perennial stream, water consumed from use at the RCQ is assumed to impact the Arkansas River through the groundwater system, rather than Red Creek. These impacts are lagged over time based on the geologic characteristics of the local aquifer. While the wells have not been sited at this time, the estimated parameters for the Glover analysis to lag depletions are based on nearby well locations that were included in an SWSP approved by DWR in 2020 (Ranch Land Development SWSP #5767, WDID 1407830) as follows: • Transmissivity of the aquifer = 1,347 gpd/ft • Storage Coefficient = 1 X 10-4 • Width of the aquifer = 95,303 ft • Distance from the wells to the Arkansas River = 15,000 ft (estimated distance). Using these parameters, the unit lag response for the wells is shown in Table 2. Note that the URFs originally calculated in the AWAS/Glover model showed depletions impacting the river from the wells over 150 months. However, at least 95% of the depletions impact was in the first 124 months. There- fore, the URFs were adjusted to “wrap” the remaining depletions into these 124 months. Holcim will use the URFs below to lag depletions from the wells to determine the impact to the Arkan- sas River. The lagged depletions determined from the projected consumptive use of water from the wells and lagged using the URFs below for calendar year 2025 is shown in Table 3.