|
6960
<br />6950
<br />2
<br />6940
<br />LU
<br />Ed
<br />W 6930
<br />e
<br />e]
<br />HORIZONTAL SCALE
<br />0 15' 30'
<br />VERTICAL SCALE
<br />0 15 30'
<br />6950
<br />Elev.
<br />ft -MSL
<br />I
<br />Area
<br />acres
<br />Total Capacity
<br />ac -ft
<br />Description
<br />6,939.5
<br />0
<br />0
<br />0
<br />Bottom of Pond
<br />Sediment Storage Elevation
<br />Principal Spillway
<br />Emergency Spillway
<br />Top of Embankment
<br />N - 31,000
<br />0.5
<br />2
<br />0.01
<br />6.941
<br />1.5
<br />0.2
<br />0.2
<br />V
<br />2.5
<br />0.3
<br />ad
<br />W
<br />3.5
<br />�
<br />W
<br />6,944
<br />4.5
<br />W
<br />1.5
<br />/
<br />W
<br />1.1
<br />2.5
<br />W
<br />I
<br />to
<br />3.8
<br />6,947
<br />7.5
<br />1.7
<br />5.3
<br />6,948
<br />8.5
<br />W 6930
<br />7.2
<br />6,948.2
<br />8.7
<br />2.1
<br />7.6
<br />6,949
<br />9.5
<br />2.4
<br />9.4
<br />6,950
<br />10.5
<br />2.7
<br />12.0
<br />6,950.2
<br />10.7
<br />2.8
<br />12.4
<br />6,951
<br />11.5
<br />2.9
<br />14.8
<br />6,952
<br />12.5
<br />3.2
<br />1 17.9
<br />6,953
<br />13.5
<br />3.4
<br />1 21.2
<br />/CULVERT IA5
<br />-
<br />6950 - --
<br />�A
<br />\
<br />N - 31.200
<br />I
<br />/ i Z -
<br />BOTTOM PO
<br />�� I
<br />/
<br />ELEV. 699 39.5'
<br />-
<br />�
<br />N - 1,400
<br />X 69
<br />J
<br />GENCY
<br />NVERT ELEV.
<br />0.2'
<br />-
<br />PRINCIPAL SP
<br />g° CORRUGATEt PLASTLC
<br />- -
<br />i'
<br />6945 A'
<br />fi94
<br />OUTFLOW CHANNEL
<br />E MBANKMENT
<br />ELEV. 695
<br />RIPRAP LINED D 4.5
<br />-.
<br />N 1.600
<br />/
<br />6960
<br />6950
<br />2
<br />6940
<br />LU
<br />Ed
<br />W 6930
<br />e
<br />e]
<br />HORIZONTAL SCALE
<br />0 15' 30'
<br />VERTICAL SCALE
<br />0 15 30'
<br />6950
<br />Elev.
<br />ft -MSL
<br />I
<br />Area
<br />acres
<br />Total Capacity
<br />ac -ft
<br />Description
<br />6,939.5
<br />0
<br />0
<br />0
<br />Bottom of Pond
<br />Sediment Storage Elevation
<br />Principal Spillway
<br />Emergency Spillway
<br />Top of Embankment
<br />6,940
<br />0.5
<br />2
<br />0.01
<br />6.941
<br />1.5
<br />0.2
<br />0.2
<br />0 6.940
<br />2.5
<br />0.3
<br />0.4
<br />6,943
<br />3.5
<br />�
<br />0.9
<br />6,944
<br />4.5
<br />I
<br />1.5
<br />6,945
<br />5.5
<br />1.1
<br />2.5
<br />6,946
<br />I
<br />to
<br />3.8
<br />6,947
<br />7.5
<br />1.7
<br />5.3
<br />6,948
<br />8.5
<br />W 6930
<br />7.2
<br />6,948.2
<br />8.7
<br />6920 1 0 50 100 150 200 250
<br />DISTANCE IN FT.
<br />CROSS- SECTION B -B'
<br />HORIZONTAL SCALE
<br />0 15 30'
<br />VERTICAL SCALE
<br />0 16 30'
<br />Pond 004 Stage /Storage
<br />10 -Year, 24 -Hour Storm Event
<br />Elev.
<br />ft -MSL
<br />Stage
<br />ft
<br />Area
<br />acres
<br />Total Capacity
<br />ac -ft
<br />Description
<br />6,939.5
<br />0
<br />0
<br />0
<br />Bottom of Pond
<br />Sediment Storage Elevation
<br />Principal Spillway
<br />Emergency Spillway
<br />Top of Embankment
<br />6,940
<br />0.5
<br />0.07
<br />0.01
<br />6.941
<br />1.5
<br />0.2
<br />0.2
<br />6,942
<br />2.5
<br />0.3
<br />0.4
<br />6,943
<br />3.5
<br />0.6
<br />0.9
<br />6,944
<br />4.5
<br />0.8
<br />1.5
<br />6,945
<br />5.5
<br />1.1
<br />2.5
<br />6,946
<br />6.5
<br />1.4
<br />3.8
<br />6,947
<br />7.5
<br />1.7
<br />5.3
<br />6,948
<br />8.5
<br />2.1
<br />7.2
<br />6,948.2
<br />8.7
<br />2.1
<br />7.6
<br />6,949
<br />9.5
<br />2.4
<br />9.4
<br />6,950
<br />10.5
<br />2.7
<br />12.0
<br />6,950.2
<br />10.7
<br />2.8
<br />12.4
<br />6,951
<br />11.5
<br />2.9
<br />14.8
<br />6,952
<br />12.5
<br />3.2
<br />1 17.9
<br />6,953
<br />13.5
<br />3.4
<br />1 21.2
<br />Pond 004 Emcegcncy Spillway Design
<br />25 -Year, 24 -Hour Storm Event
<br />0 0 o
<br />Section
<br />Peak
<br />Side Slope
<br />channel Slope
<br />Velocity
<br />FlowDepthz
<br />Design
<br />channel
<br />Discharge
<br />( %)
<br />(fps)
<br />(ft)
<br />Depths
<br />Tim.g°
<br />cfs
<br />ft
<br />Crest
<br />1 7.57
<br />4H 1V
<br />1.2
<br />22
<br />V
<br />Outslo e
<br />7 57
<br />4II:1V
<br />30
<br />4.3
<br />0.2
<br />1.2
<br />1 Dw = 4.5 inches
<br />Notes: 1) Velocity valve taken from Stability Class D
<br />2) Flow depth taken from Capacity Class B.
<br />3) Design depth = flow depth plus one -foot (1.0) of freeboard
<br />4 Rock npeal, size estimated using FADER Method Dan plus three 3 inches
<br />NOTES: 1. As -built embankment configuration, spillway structure and impoundment
<br />elevations presented herein were surveyed in September, 2005.
<br />2. This as -built drawing was originally approved by the Colorado Division of
<br />Reclamation, Mining and Safety for the Seneca II Mine, Permit C -80 -005.
<br />The approved Seneca II Mine drawing is Exhibit 7 -12A, Pond 004 Principal
<br />Spillway Replacement As- built, issued for TR -42, September, 2007.
<br />3. Pond 004 is an approved postmine permanent impoundment. The office of
<br />State Engineer approved the permanent impoundment request
<br />demonstration in a memorandum to Colorado Division of Reclamation,
<br />Mining and Safety dated July 12, 2006. The CDRMS approved the
<br />permanent impoundment demonstration as part of TR -37 in a decision
<br />dated September 12, 2006.
<br />SCREENED CAGE
<br />PRINCIPAL SPILLWAY DETAIL
<br />NOT TO SCALE
<br />POND 004 PLAN VIEW 0 wSjF�
<br />Em 26046 of
<br />6960 ,��� � n1 o���0 ° ° �
<br />BOTTOM OF POND 6939.5'
<br />M
<br />PRINCIPAL SPILLWAY -
<br />8 CORRUGATED PLAS77C PIPE
<br />ELEV. 6948.2'
<br />350
<br />6950
<br />a
<br />6940 2
<br />s
<br />6930 N
<br />6920
<br />TOP OF EMBANKMENT
<br />ELEV. 6953.0'
<br />EMERGENCY SPILLWAY
<br />6960
<br />i
<br />6950
<br />0 0 o
<br />I
<br />n
<br />6940 2
<br />2
<br />6930 r
<br />400 450
<br />6920
<br />SCALE
<br />59 0 50 100'
<br />CONTOUR INTERVAL 10 & 1 FT.
<br />PROFESSIONAL ENGINEERS STATEMENT
<br />l state that this mop was prepared
<br />under my supervision and all the
<br />information presented hereon is true
<br />and correct to the best of my
<br />nowledge an in r tion.
<br />I2
<br />a e Micha l W. Ludlo , CO P.E. 26046
<br />CT 02- 051 - 5-
<br />9u
<br />DISTANCE IN FT.
<br />CROSS - SECTION A -A'
<br />
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