2007-06-01_PERMIT FILE - C1981019A ‎(19)‎

• Permit No: C1981019A
• IBM Index Class Name: Permit File
• Doc Date: 6/1/2007
• Doc Name: Attachment 1 to Attachment 12
• Section_Exhibit Name: Exhibit 07 Streeter Pond 001A
• Media Type: D
• Archive: Yes

C
ca~ownro coal coM~aNY
001A-STREETER
SEDIMENTATION POND SUMMARY
ORIGINAL 1998 199$ 2006 DIFFERENC
CONFIGURATION STUDY STUDY DIFFERENCE STUDY 199$ TO 200
ATERSHED AREA (acres}:
Disturbed 0.o a.a o.o o,o
Postmining Topsokled and Seeded 50.6 231.3 1803 471.5 240.2
Postmintng Undisturt~d 207.0 53.8 -153.2 148.1 94.3
1-2 Year Reclamation 23.0 79.4 56.4 68.5 -10.9
3+ Year Redamatian 845.5 843.3 -2.2 620.4 -222.9
Total Area 1126.1 1207.8 81.7 1308.5 100,7
PONE PARAMETERS:
Bottom ElavaGon 6576.7 6576.7 6579.0 2.3 8578.0 -t.0
Pdnclpai Sp{~way Invert Elevation 6566.9 6586.7 6585.0 -1.7 6585.0 0.0
Entetgency Spillway Invert Elevaton 6588.0 6588.0 6588.0 0.0 6588.0 0.0
Top of EmQankmagt 6590,0 6590.0 6591.0 1.0 6591.0 0.0
Storage Volume Bekwv Emergency Spillway {ac-ft} 11,08 11.08 11,17 0.09 11.2 0.0
Storage Volume Batow Principal SpiiMray {ac-tt} 6.12 8.39 5.21 -3.18 5.2 0.0
Princpal 5p11way Parameters:
Type Drop Inlet Drop Inlet Pelf. Riser Perf. Riser
Riser Diameter(in} 12.0 i2.0 12.0 0.0 i2.0 0.0
Riser Height {ft) 5.7 5.5 3.7 -1.8 3.7 0.0
Barrel Dian~ter {in} 18.0 24.0 18,0 -6.0 18.0 0.0
Elevation of Perforation{s} {ft} N/A N/A 6583.0 6583.0
Sizes of Parforatkm{s) {in} NIA NIA 4.0 4.0
Number of Perforations NIA N/A 2 2.0
Emergency 5pitM+ay Parameters;
Type Trapeze}dal Trapezoidal Trapezodda! Trapezoidal
Diameter {in) NIA NIA N/A N!A
Bottom Width {ft) 20.0 20.0 20.0 0.0 20.0 0.0
Length {ft) 40.0 40.0 45.0 5.0 50.0. 5.0
Side Stopes'zH: tV {ft} 2.0 3.0 1.5 -1 b 1.5 0.0
HYpROLpGICtHYDRAUUC PARAMETERS:
Base Ftow Rates {cis} 1.00 0.03 -0.97 0,15 0.0
10-Year, 24-Hour Sicxrn Event:
Precipitation (in) 1.$ 1.8 0.0 1.8 0.0
Runoff Volume {aofit) 3.1 13.7 10.6 4.8 13.2
Prinrapai Spillway Peak Discharge {cts} 33 6.5 2.8 1,6 0.9
Emergency Spiitway Peak Discharge {cfs) 0.0 0.0 0.0 0.0 21.5
Peak Surface Water Stage Elovaton {h) 6587.7 6587.9 0.2 6585.1 0:8
25-Year, 24HCUr Storm Event:
Precipitation {in} 2.3 2.3 0.0 2.3 0.0
Runoff Volume {acdt} 7.1 23.3 16.2 1#.0 23,3
Prncpal Spillway Peak Discharge t~s) 4.5 7.6 3.7 5.7 0.6
Esrergency Spillway Peak Discharge {cfs) 3.6 29.7 26.1 0.0 76.3
Peck Surface Water Stage Elevation {ft} 6588.1 6588.9 0,8 6587.3 0.8
Pond Freetsoard (it} 1.9 2.1 0.2 1.3 -0.8
SEDIMENT LOADING PARAMETERS:
Storm Predicted Peak Setitabte Concentration (mUi) 0.00 0.00 0A 0.01 0.0
Predir~ad Annual Sediment Leading {ac-it) 0.42 0.84 0,42 1.30 0.5
Available Sediment Storage Volutes {ac-ft) 1.27 0:90 -0.37 0.84 -0.1
tviaytimum Sediment Storage Elevation {tt) 6581.3 6581.3 6581:3 0.0 6581.3 0.0
Predicted Nutn~r of 5to a Years 3.0 1.1 -2.0 0.6 -0.4
Exh. 7-SP-20 Revision Date: 2/1/06
Revision No.: TR-63