2024-04-08_PERMIT FILE - M2024015

• Permit No: M2024015
• IBM Index Class Name: Permit File
• Doc Date: 4/8/2024
• Doc Name: Application
• From: J & T Consulting, Inc
• To: DRMS
• Email Name: BFB
• Email Name: EL1
• Media Type: D
• Archive: No

SVRC Groundwater Evaluation
January 2024 Page 3 of 58
wells within the mounding and four registered wells located within the shadowing areas as
summarized in Table 1:
Table 1 -Pit Scenario 1 Impacts - Only SVRC (no Mitigation)
Water Level Changes in Registered Wells(Run 1)
It# Name Twn Rng Sec Modeled Link to DWR Permit
Change(ft)
Mounding(+)
58-WCB KROSH&HANSEN 4 N 6613 30 +1.2 https://dwr.state.co.us/Tools/WeIlPermits/C620058
54-WCB HANSEN,CASTOR 4 N 66 W 30 +1.9 https://dwr.state.co.us/Tools/WeIlPermits/C620054
Shadowing(-)
19924-U EPPINGER LINDA KAY 4 N 66 W 19 • -2.1 https://dwr.state.co.us/Tools/WeIlPermits/9062686
19924-W EPPINGER LINDA KAY 4 N 66 W 19 -1.2 https://dwr.state.co.us/Tools/WeIlPermits/9062688
19924-V-R EPPINGER LINDA KAY 4 N 66 W 19 -1.1 https://dwr.state.co.us/Tools/WeIlPermits/9062687
185466-A EATON CATTLE CO 4 N 66 W 19 -1.1 https://dwr.state.co.us/Tools/WeIlPermits/03719518
The combined effect of upgradient mounding and seasonal water level increases may
increase water levels to within 10 feet of ground level at these wells, which may require
upgradient mitigation to prevent their basements (if they exist) from flooding.
SVRC Mitigation Options
We evaluated two mitigation options, both included installing two vertical dewatering wells
upgradient of the SVRC and pumping a combined total of approximately 400 gpm total to offset
upgradient mounding.
The preferred option is to discharge the dewatering wells into a pipeline belonging to the
applicant (CCWCD) which discharges near the SPR approximately 3 miles to the north. By
doing so, the shadowing will increase due to drawdown from the extraction wells. Figure All
shows that the downgradient shadowing of -1 to -3 feet extends approximately one-half mile
from the SVRC. Eight wells are affected and summarized in Table 2.
Table 2 -Pit Scenario I - Only SVRC (with Flow to CCWCD Pipeline)
Downgradient Shadowing in Registered Wells(Run 1Mit-a)
Modeled
?ermit# Name Twn Rng Sec Change(ft) Link to DWR Permit
19924-U EPPINGER LINDA KAY 4 N 66 W 19 -2.7 https://dwr.state.co.us/Tools/WellPermits/9062686
19924-W EPPINGER LINDA KAY 4 N 66 W 19 -1.7 https://dwr.state.co.us/Tools/WeIlPermits/9062688
19924-V-R EPPINGER LINDA KAY 4 N 66 W 19 -1.5 https://dwr.state.co.us/Tools/WellPermits/9062687
185466-A EATON CATTLE CO 4 N 66 W 19 -1.5 https://dwr.state.co.us/Tools/WellPermits/0371951B
14028-R UNITED WATER&SANIT)4 N 66 W 30 -1.5 https://dwr.state.co.us/Tools/WeIlPermits/9061848
19924-T-R EPPINGER LINDA KAY 4 N 66 W 19 -1.4 https://dwr.state.co.us/Tools/WeIlPermits/9062685
23014 BRECKON,HOWARD W 4 N 66 W 19 -1.3 https://dwr.state.co.us/Tools/WellPermits/9062965
11113-R HS LAND&CATTLE LLC 4 N 66 W 30 -1.3 https://dwr.state.co.us/Tools/WeIlPermits/9060576
11114-R HS LAND&CATTLE LLC 4 N 66 W 30 -1.3 https://dwr.state.co.us,tTools/WellPermits/9060577
187426-A MORAN,TERESA 4 N 66 W 30 -1.3 https://dwr.state.co.us/Tools/WellPermits/0385674D
19924-R-R HS LAND&CATTLE LLC 4 N 66 W 19 -1.0 https://dwr.state.co.us/Tools/WellPermits/0343851
The second mitigation option is to install an exfiltration drain downgradient of the SVRC to
infiltrate the 400 gpm pumped by the dewatering wells. This will effectively mitigate pit
impacts as shown in Figure A13. Although this run demonstrates that exfiltration drains are
effective, we believe pumping into CCWCD's pipeline may provide additional shadowing
benefits downgradient and the small declines will not affect the yield of nearby wells.
Impacts by Other Pits
In Appendix B,we evaluated four additional pit development scenarios including:
McGrane Water Engineering,LLC
1669 Apple Valley Rd. • Lyons,CO 80540 • Phone:[phone];email:[e-mail]