PERMFILE45165

• Permit No: C1980003
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: SEDIMENT CONTROL PLAN
• Section_Exhibit Name: APPENDIX E ‎(image 20 crooked)‎
• Media Type: D
• Archive: No

•
And estimated
Pc = 0.6
Pm = 0.3
Ps = 0.1

Vs = 4.62 x 2,000
5.30
Then
(0.3) + 97 (0.1) = 55.3 lbs/ft3
= 0.004 Ac-Ft
Yr. Ac
Vs = (3) (0.004) (2.4) = 0.03 Ac-Ft for 3 Yrs
Total Volume Req'd =Water + sediment
= 0.17 + 0.03
= 0.20 Ac-Ft
Emergency Spillway:
Direct runoff 25 Yr = 1.11"
for 3$ slopes
Q 25 Y = (1.11) (4.5) (0.93) = 4.7 cfs
The sp~lway is sized to handle the peak flow = 4.70
1 - 18" crop flowing full will carry = 5 cfs
1 - 18" crop for spillway
`J
Sanitary Landfill
Drainage = 4.9 Ac-Ft - Represents the landfill itself and the undiverted
natural area. All of the 4.9 acres are assumed to be disturbed with CN =
89.
Volume 10 Yr - (4.9) (0.86/12) = 0.35 Ac-Ft of water
Sediment Volume:
The same values are used as for the explosives storage area.
Vs = 0.004 Ac. Ft
Yr. Ac
for 4.9 Ac, Vs = (0.004) (3) (4.9) = 0.06 Ac. Ft.
Total Req'd Volume =Water + Sediment
= 0.35 + 0.06 = 0.41 Ac. Ft.
Emergency Spillway
Direct runoff 25 Yr = 1.11"
For 4$ slopes
Q = (1.11) (7.8) = 8.7 cfs
1 ?r'L4X'r0 crop flows 10 cfs when full
Use 1 - 24" crop
Sedimentation Pond By Office
The area drained into this pond is the shop area (12.7 ac) and the topsoil
stockpile "A" located southwest of the shop area (7.9 ac).
Total drainage = 20.6 ac
Volume 10 Yr = (20.6) (0.86/12) = 1.48 Ac. Ft.
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