2023-10-03_REVISION - M1977344 ‎(32)‎

• Permit No: M1977344
• IBM Index Class Name: Revision
• Doc Date: 10/3/2023
• Doc Name Note: App 4.6 Red Creek Quarry Modelint
• Doc Name: Request For Amendment To Permit
• From: Holcim ‎(US)‎ Inc.
• To: DRMS
• Type & Sequence: AM2
• Email Name: MAC
• Email Name: TC1
• Media Type: D
• Archive: No

Red Creek Quarry, Groundwater Modeling Analysis

13
DRAFT for review purposes only. Use of contents on this sheet is subject to the limitations specified at the beginning of this document.
RedCreekQuarry_Modeling_TM_DRAFT_20230911
Table 2. Red Creek Quarry Mine Block Groundwater Rates Model Results
Mine Block Rate of Groundwater Entering Mine Block
(ft3/day) (gpm) (acre-feet/year)
0 to 10 440.75 2.29 3.69
0 to 10 deep sandstone 1326.69 6.89 11.12
10 to 20 0 0 0
10 to 20 deep sandstone 3134.09 16.28 26.26
20 to 30 8742.07 45.41 73.25
30 to 40 0 0 0
40 to 50 0 0 0
50 to 60 0 0 0
60 to 70 0 0 0
70 to 80 0 0 0
80 to 90 0 0 0
90 to 100 0 0 0
3.3 Projected MPO Mine Block Creek Influence
To evaluate the potential impact of each mine block on Red Creek, the rate of groundwater in for each Red
Creek reach during every mine block was compared to the EC model results. Table 3 illustrates the compari-
son between every mine block and each Red Creek reach with the EC model results. Projected flow rates are
for comparison purposes only.
There were no reaches in Red Creek that became dry during the MPO. There was also no significant de-
crease in any of the Red Creek reaches at any point during the MPO. These comparisons suggest that the
mine blocks will not influence Red Creek.
Table 3. Red Creek Quarry Mine Block Influence on Red Creek Model Results
Stream
Reach 1 2 3 4 5 6 7 8 9 10 11
Mine Block Rate of Groundwater Entering Stream (ft3/day)
Existing
Conditions 1854 646 66 51 230 136 47 9 0 0 0
0 to 10 1852 640 64 50 229 136 47 8 0 0 0
10 to 20 1851 640 64 49 229 135 47 8 0 0 0
20 to 30 1851 640 64 49 229 136 47 8 0 0 0
30 to 40 1852 640 64 49 229 136 47 8 0 0 0
40 to 50 1851 640 64 49 229 135 46 9 0 0 0
50 to 60 1852 640 64 49 229 135 46 8 0 0 0
60 to 70 1851 640 64 48 229 135 46 9 0 0 0
70 to 80 1852 640 64 49 228 134 46 9 0 0 0