PERMFILE117568

• Permit No: C1981014
• IBM Index Class Name: Permit File
• Doc Date: 8/19/2002
• Doc Name: pages 197 to 210
• Section_Exhibit Name: Exhibit 19 Small Area Exemptions
• Media Type: D
• Archive: No

Table 1
SEDIMENT POND - DESIGN SUMMARY
POND 4 POND 5
WATERSHED AREA (aeZeS):
Reclaimed 95.1 31.0
Undisturbed 0 12.3
Total Area 45.1 96.3
POND PARAMETERS:
Bottom Elevation Ift msl) 6234.0 6076.0
Principal Spillway Invert Elevation (ft msl) 6240.5 6082.5
Emergency Spillway Invert Elevation Ift msl) 6291.5 6083.6
Top of Embankment (ft msl) 6294.0 6085.8
Storage Volume Below Principal Spillway (ac -f t) 3.96 3.05
Storage Volume Helow Emergency Spillway (ac-ft) 4.85 3.89
Principal Spillway Parameters:
Type Drop Inlet Drop Inlet
Riser Diameter (in) 30 30
Riser Height (ft) 3.5 5.5
Harrel Diameter (in) 30 24.0
Emergency Spillway Parameters:
Type 2-30' CMPS Trapezoidal
Bottom Width (f t) NA 8
Length Ift) 40 87
Side Slopes H:1V NA 3.0
HYDROLOGIC/HYDRAULIC PARAMETERS:
10-year, 24-hour Storm Event:
Precipitation (in) 2.8 2.8
Runoff Volume (ac-f tl 3.96 4.4
Principal Spillway Peak Discharge (cf s) 17.0 23.7
Emergency Spillway Peak Discharge lcf s) 0.0 0
Peak Surface Water Stage Elevation (ft msl) 6241.3 6083.5
25-year, 24-hour Storm Event:
Precipitation (in) 3.4 3.4
Runoff Volume (ac-f t) 5.0 6.14
Principal Spillway Peak Discharge (cf s) 24.9 24.7
Emergency Spillway Peak Discharge (cf s) 1.8 5.1
Peak Surface Water Stage Elevation (ft msl) 6241.6 6084.0
Pond Freeboard (ft) 2.9 1.8
SEDIMENT LOADING PARAMETERS:
Storm Predl cted Peak Settleable Concentration (ml/1) 0.00 0.00
Predicted Annual Sediment Loading (ac -f t) 0.22 0.20
Available Sediment Storage Volume (ac-f t) 2.2 2.0
Maximum Sediment Storage Elevation (ft msl) 6238.2 6080.8
Predicted Number of Storage Years 10 10
CHANNELS
The existing designs found in this exhibit for the channels that will
remain were calculated for worst case condition and should be adequate
for post closure conditions. No additional or redesign is required.
SAES
The existing sediment control structures associated with the SAES will
remain in place after final grading and topsoil placement is completed.
The sediment controls will remain in place until vegetation is
reestablished. The existing designs found in Appendix C of this Exhibit
209