2018-04-02_PERMIT FILE - C1981019 ‎(26)‎

• Permit No: C1981019
• IBM Index Class Name: Permit File
• Doc Date: 4/2/2018
• Doc Name: Sidehill Impoundment Design Drawing
• Section_Exhibit Name: Volume 18 Exhibit 7, Item 23 Figure C5
• Media Type: M
• Archive: No

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7200 7200
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EM8 WENT ES
7774"
7170 7170
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7110o � 7110
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O N N N M M co M 7 V 7 b LO Ln cc
j PROFILE THROUGH IMPOUNDMENT
SCALE 1" =50' Profile Impoundment
Topography Premine
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EMBANKMENT DETAILS
` Scale 1" = 20'
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UPSTREAM DOWNSTREAM
8 inch di CMP + EMBANKMENT CREST
7174.0
WALKWAY W 42 HANDRAILS AS SPECIFIED
7j drains to 1 lower Ditch - PRINCIPAL SPILLWAY WITH NCRS ANTI-VpRTEX TRASH RACK,EL 7170.0
2 RISER IS 18"DIA. GALV STEEL CMP, 14 GAUGE MIN. o'
TWO 3"DIA.PERFORATIONS AT EL. 7167.0
f EMERGENCY SPILLWAY,EL, 7172.0(BOTTOM OF RIPRAP)
0 NORMAL POOL
. # EL. 7T� EL. 7161.1 i
1 NRL sOMP Rise I i FLOW TO DITCH of LOWER
ONE YEAR SEDIMENT ACCUMULATION, EL. 7157.3 EL. 7155.0
�. - POND BOTTOM
' ins D5 Rlpsap 'i _ EL. 7155.0 ANTISEEP COLLARS 6 FT(MIN)
�- 7 i installe in Spillway TWO REQUIRED ON 20 FT CENTERS
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18"0 GALV STEEL CMP, 14 GAUGE MINIMUM,'0
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Acceptable Fill Materials:
Suitable fill materials can be obtained from pond excavations or from nearby borrow sources. Suitable materials include native clay soils, clayey sand soils, and bedrock materials which are broken down to these soil types (SC, CC, CL and CH).
Bedrock materials should be processed to produce a soil like material with maximum particle size of 6 inches. The materials used as embankment fill should have at least 25 percent fines (material finer than No. 200 sieve). The field engineer may
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approve the use of other materials following appropriate laboratory testing.
Unacceptable Fill Materials:
Materials not considered suitable for use as embankment fill include cleaner sand and gravel. Also unacceptable are highly carbonaceous materials obtained from bedrock excavations or well-cemented sandstones which do not break down to soil like material.
Highly organic soils or materials containing construction debris are also not acceptable. Frozen soil is not acceptable.
Fill Placement and Compaction:
Embankment fill should be placed in thin horizontal lifts (8 to 12 inches loose thickness). The fill should be moisture conditioned to within 2 percent of optimum moisture content and compacted to at least 95 percent of standard proctor maximum dry density
(ASTM D 698). The placing and spreading of fill materials should be started at the lowest point of the embankment. Fill placement and compaction should be observed and tested by qualified geotechnical engineering firm.
- Construction Notes:
1. See Map 41B for general location and associated drainage areas.
2. Embankment to be constructed of compacted fill using materials specifed by field engineer. Refer to
to Exhibit 7, Item 20, Part F for Geotechnical Information and compaction specifications. Figure 3 of
that document contains requirements for site preparation, fill materials,placement requirements, and
monitoring.
3. Hatched area of the spillway shall be riprapped with 12 inch D50 size material.
N AREA-CAPACITY TABLE
(To be revised following as-built survey) PRECEIVED
ELEVATION AREA AVERAGE AREA CAPACITY
INCREMENTAL CUMULATIVE i° Q1E
(Feet) (Acres) (Acres) (Acre-Feet) (Acre-Feet)
W E i_.rsion of Reclamation,
7155.0 0. 155 0.00 ENGINEERS CERTIFICATION Mining&Safety
0. 17 0. 17 I, LEE E. SAMPSON, hereby certify that this
ma has been reviewed b me and is true
7156.0 0. 179 0.21 0.41 0. 17 and correct to the best of my knowledge and TR-118
S information, relying on information supplied Approved 4/2/18
f 7158.0 0.232 0.58 by experts employed by Colowyo Coal
0.26 0.52 Company or qualified consultants working
7160.0 0.292 1. 10 for Colowyo Coal Company, and that I am a
Professional Engineer licensed in Colorado as
0.33 0.65
required by the provisions of C.R.S.
Idehlll Pond - Plan View 7162.0 0.359 1. 75 12-25-101 through C.R.S. 12-25-119. IN SIDEHILL IMPOUNDMENT
Scale 1" = 50' 0.40 0. 79 WITNESS WHEREOF, 1 have hereunder set
7164.0 0.433 2.54 my hand and affixed my seal. DESIGN DRAWING
0.47 0.95
7166.0 0.514 3.49 ,,,,�Q111IIIA(/ 0 DATES: 1-11-As 8d
0.56 1. 11 0` P° DRWG BY: I FR
7168.0 0.601 4.60 `°
LOP) COAL APPROVED BY:
0.64 1.28Fe>COMPANY a� DRWG NO.
7170.0 0.674 5.88 = U : v - Colowyo
47031 = Exh. 7, Item 23
°'ao"°"°°° Figure C5
7172.0 0. 794 0. 73 1.47 7 35 : �� ., z-�Z-,y;• �� c 5eaksia,eH9do 64
•, , Meeker,Cdom 8113
i��',,,!I���U�� `,, No. REVISION DATE BY CHK
TOTAL CAPACITY 7.35 ACRE-FEET (DESIGN)
TR-118 Removed Gate Valve,Modified Pond Specs 1119118 LES JG
TR-118 Revised Emergency Spillway Elevation 2112118 Tony LES
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