2024-11-22_PERMIT FILE - C1992081 ‎(2)‎

• Permit No: C1992081
• IBM Index Class Name: Permit File
• Doc Date: 11/22/2024
• Doc Name: Sediment Control and Pond Designs
• Section_Exhibit Name: Tab 12 Appendix 12-1
• Media Type: D
• Archive: No

0.009 ac-fr per day of baseflow to the pond. Consequently, expected
daily water use associated the facility operations will not cause a
significant change in the volume of water stored in the pond.
Hvdroloav: 10-year, 24-hour ppt event = l.7 inches (from existing permit information)
Type II storm distribution
Runoff slopes and lengths were digitized directly from Exhibit 12-2
CN: curve number (CN) design criteria are from existing permit information;
Procedures far Determining Peak Flows in Colorado (SCS, ] 980) was
utilized to determine runoff design criteria for the following conditions.
Disturbed -facilities area
Soil type: C
Ground cover: baze, poor ground cover
Cover type:
CN:
Sedimentolo¢v: R-Factor:
K-Factor:
LS Factor:
C Factor:
P Factor:
none
89
10 (taken from Figure 8A.6 in Haan, $arfield, and
Hayes, 1994, after Renard et al., 1993).
0.25 (from Appendix 12-2 of existing permit)
digitized from Exhibit 12-2
1.0 (baze soil, packed under construction conditions)
1.0
Grain size analysis: from Appendix 12-2 of existing permit
Pond Desien: from Exhibit 12-3 of existing permit
Fabriform combination spillway invert elevation is 6382.56 feet. Top of
embankment is 6,385.56 feet.
Initial pool elevation in SEDCAD demonstration set at 6,382.56 feet.

TR-06 12-1B.29 Revised OS/OS