PERMFILE106811

• Permit No: C1980005A
• IBM Index Class Name: Permit File
• Doc Date: 1/26/2005
• Section_Exhibit Name: Tab 12 Operation Plan
• Media Type: D
• Archive: Yes

Table 12-6 (Continued) •
Culvert Specifications
Seneca II Mine, Routt County, Colorado
Drainage Culvert3 Culvert Minirtwn4
Area Peak F3moff2 Diameter Length Cover Design
Locationl (Acres) Q10 (cfs) (Irrhes) (feet) (Inches) Method
54a 4.1 0.3 24 28 12 SFDCADi-
55a 1.5 0.9 24 60 12 SIDCADt
56a 0.8 0.5 18 2U 12 SIDCADt
57a 6.7 2.1 18 40 12 SIDCAPF
59a 16.5 4.0 18 20 12 SEDGAD+
60a 9.4 4.9 24 60 12 SEDC~ID+
62a 66.9 17.82 24 150 12 SIDCADF
63a 18.3 8.2 24 150 12 SIDCAUt
64a 0.7 0.6 24 20 12 SIDC'AD+
65b 17.5 10.7 24 80 12 SFDC.~,D+
Al 12.2 0.9 24 30 12 SIDCI~DF
A2 2.3 0.2 12 30 12 SIDCADt
A3 154.4 5.4 30 30 12 SIDCAPF
A4 7.8 0.6 12 47 12 SIDCADt
A5 46.4 11.2 30 48 12 SEDCI.D+
A7 384.1 22.2 42 26 12 SIDCAD+
AS 11.7 0.9 24 20 12 SEDCAD+
lAn "a" suffix indicates existing culvert; a "b" suffix indicates propo,ed
culvert. See F~ibit 7-7 for locations.
2"Procedures for detcrm;n;m peak flows in Colorado - incorporates and
suppl~ients ~ecYuiical Release No. 55 Urban Hydrology for Small Watersheds";
SCS, U.S. nen3r+nw„i- of Ac~iculttne, March 1980.
3"Hycir-aulic Charts for the Selection of Highway Culverts", Hydraulic
Ehgineeri~ Circular No. 5, reprinted June 1980 and Dodson & Associates,
IiIC., Pipe Culvert Analys].S. Minion nn Cliallleter req~~i red.
4American Iron and Steel Institute, "Handbook of Steel Drainage and Highway
Construction Products", 1980 (Mini,m,m 1hiCla'~ess = 16 gage)
SCulverts replaced as of October 2, 1989.
•
•
12-33 Revised 10/04/94