2023-02-24_HYDROLOGY - M2004009 ‎(2)‎

• Permit No: M2004009
• IBM Index Class Name: Hydrology
• Doc Date: 2/24/2023
• Doc Name: Substitute Water Supply Plan
• From: Division of Water Resources
• To: DRMS
• Email Name: ECS
• Email Name: MAC
• Media Type: D
• Archive: No

ASCI Turnpike Mining Resources SWSP Page 3 of 7
February 24, 2023
Dewatering
Groundwater will be pumped from the pump basins and discharged directly to Boulder Creek from Cells 5
and 6. The total amount of water anticipated to be dewatered is 112.27 acre-feet during this SWSP
period, as shown on Table 4 (attached).
Total Consumptive Use
The total consumptive use at this site during 2023 will be 125.2 acre-feet, which includes 11.18 acre-feet
of net evaporative loss, 1.76 acre-feet/year of water used for dust control, and 112.27 acre-feet/year of
water from dewatering.
Lagged Depletions
The IDS AWAS stream depletion model was used to determine the lagged depletions from previous
evaporation, operational losses, and dewatering to Boulder Creek in Cells 2A, 213, 3*, 4*, 5 and 6. The
aquifer characteristics used in the model are as shown in the following Table B using the alluvial aquifer
boundary condition.
Table 8: IDS AWAS Parameters
Cell Transmissivity Specific Yield (%) W, distance to X, distance to
(gpd/ft) boundary ft stream ft
2A and 2B 44,883 20 3,400 3,050
3* 44,883 20 3,400 1,065
4* 44,883 20 1,350 275
5 and 6 44,883 20 1,350 600
*Remaining lagged depletions due to mining and dewatering activities during previous SWSP period.
Lagged depletions due to dewatering are as follows:
1. 11.47 acre-feet for Cells 2A and 2B (evaporation from the wash pond and settling pond, and dust
control),
2. 0.3548 acre-feet for Cell 3 (previous mining activity and dewatering),
3. 0.0026 acre-feet for Cell 4 (mining, dewatering, and evaporation from the pump basin and
dewatering trench), and
4. 114.03 acre-feet for Cells 5 and 6 (mining, dewatering, and evaporation from the pump basin and
dewatering trench).
The total lagged depletions for 2023 are equal to 125.85 acre-feet (Table 5 and Table 6, attached).
For purposes of this SWSP the point of depletion for the gravel mining operation shall be on Boulder Creek
where Boulder Creek crosses the north line of Section 31, Township 2 North, Range 68 West, 61h P.M.
Replacements
Out-of-priority depletions associated with the mining operation at this site will be replaced using fully
consumable municipal return flows leased from the City of Louisville and with excess water returned from
dewatering after lagged dewatering depletions are replaced on a monthly basis.
A copy of the lease with this City was provided to this office on February 13, 2023 and is attached to this
letter. The current lease is valid for the period of January 1, 2023 through December 31, 2023 therefore