2024-10-15_PERMIT FILE - M2024053 ‎(4)‎

• Permit No: M2024053
• IBM Index Class Name: Permit File
• Doc Date: 10/15/2024
• Doc Name: Application
• From: Mid-States Materials, LLC
• To: DRMS
• Email Name: BEH
• Email Name: ZTT
• Email Name: EL1
• Media Type: D
• Archive: No

Table G-3. Drainage Calculations
Drainage Basin 1
Discharge
Site Runoff 100-Yr 24-Hr Detention Capacity
Condition Area(ac) Coefficient Runoff(ac-ft) Flow Rate (ac-ft)***
(gpm)*
Base 0.13 11.7 26,600 0
Mine 364 0.50 49.5 1,000-3,000** 63.5
Reclamation 0.22 21.8 20,800 0
Drainage Basin 2
Discharge
Site Runoff 100-Yr 24-Hr Detention Capacity
Condition Area(ac) Coefficient Runoff(ac-ft) Flow Rate (ac-ft)***
(gpm)*
Base 0.13 3.7 11,790 0
Mine 120 0.50 17.0 1,000-3,000** 26.0
Reclamation 0.22 7.5 10,500 0
Drainage Basin 3
Discharge
Site Runoff 100-Yr 24-Hr Detention Capacity
Condition Area(ac) Coefficient Runoff(ac-ft) Flow Rate (ac-ft)***
(gpm)*
Base 0.13 10.9 31,500 0
Mine 331 0.50 50.7 1,000-3,000** 63.4
Reclamation 0.22 22.3 37,400 0
Drainage Basin 4
Discharge
Site Runoff 100-Yr 24-Hr Detention Capacity
Area(ac) Flow Rate
Condition Coefficient Runoff(ac-ft) (gpm)* (ac-ft)***
Base 0.24 9.6 30,900 0
Mine 168 0.55 24.2 1,000-3,000** 25.7
Reclamation 0.40 17.6 36,200 0
Drainage Basin 5
Discharge
Site Runoff 100-Yr 24-Hr Detention Capacity
Condition Area(ac) Coefficient Runoff(ac-ft) Flow Rate (ac-ft)***
(gpm)*
Base 0.24 1.9 18,900 0
Mine 80.1 0.55 10.0 1,000-3,000** 39.0
Reclamation 0.40 7.3 28,100 0
*The discharge flow rate is calculated from the peak discharge of the 100-Yr 24-Hr storm event using the
Rational Method.
**Discharge flow rate is variable and controlled during mining as all discharges are pumped from the pit
***Detention Capacity calculated in CAD as the surface volume above the stormwater berms with various
heights at the edge of disturbance.
Limon Sand& Gravel Pit Ill Lewicki&Associates
August 2024