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<br /> Location Mapo
<br /> 400 400 800
<br /> Legend Scale 111 = 400'
<br /> Site Preparation:
<br /> Permit Boundary Prior to placing fill,the area should be stripped of organic topsoil or other deleterious materials.
<br /> Acceptable Fill Materials:
<br /> Disturbance Limit 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
<br /> 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 approve the use of other materials following appropriate
<br /> Section Through Damp ," laboratory testing.
<br /> High Water Line Unacceptable Fill Materials:
<br /> 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. iHighly organic soils or
<br /> Contour interval is 2 ft within pond area. materials containing construction debris are also not acceptable. Frozen soil is not acceptable.
<br /> Contour interval is 5 ft in other areas. Fill Placement and Compaction: ENGINEER'S CERTIFICATION
<br /> 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 1, THOMAS C. PETERSON, being a
<br /> ■ 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. Licensed Professional Engineer in
<br /> 50� 50' Tem ora Facilities Pond
<br /> Monitoring and Inspections:
<br /> the State of Colorado, do hereby Monitoring and inspections should be performed by qualified individuals as outlined in Colorado DRMS regulations 4.05.6 and 4.05.9. certify that this map has been
<br /> Scale 1" = 50' reviewed by me and is true and
<br /> Construction Notes: correct to the best of my knowledge
<br /> 1. See Exh. 7-23 Figure K7 for general location and associated drainage areas. and information relying on workperformed by others, and based on
<br /> ' Information supplied by experts
<br /> identified in section 2.03.3 of the
<br /> a� Colowyo Coal Company L.P. Permit.
<br /> v vtsio SAW
<br /> }> ♦♦ p �i
<br /> Note: This is a containment pond designed to completely store the runoff from a 10 year, 24 hour storm from the entire `�'� `,® O��•.•...•••0e�,,,��
<br /> Alk
<br /> AREA-CAPACITY TABLE drainage area. Pond must be maintained with a water surface below elevation 6404.0 to contain the 10 year storm. C• '°Fr
<br /> :
<br /> CAPACITY = V = 0.
<br /> O =
<br /> ELEVATION AREA AVERAGE AREA INCREMENTAL CUMULATIVE Hydrologic Design Storm Calculations i 32257Z
<br /> (Feet) (Acres) (Acres) (Acre-Feet) (Acre-Feet} A � : / 4-1/ 1-7 4 i
<br /> Design Drainage Area Watercourse Elevation Curve Peak Runoff i �,k • ;
<br /> ......
<br /> 6400.0 0.16 0.00 Event (acres) Length Difference No. Precip. Inflow Volume ce FS �� �♦�
<br /> 6415 ..0 . ..... .. .. ,.. n r. ...,..,. 6415 6401.0 0.19 0.18 0.18 0.18 (mi) (ft) (CN) (in) (cfs) (ac-ft) �j�, S/ONA �� `♦♦♦
<br /> 12.0 0.20 0.20 10-Yr, 24-Hr 111.7 1.02 230 See Exh. 7-23 Fig. Kt 1 1.80 11.4 1.39 ` N
<br /> 41 $ 6410 6402.0 0.21 0.38 25-Yr, 6-Hr 111.7 1.02 230 See Exh. 7-23 Fig. K1 2.30 18.0 2.70 THOMAS C PETERSON
<br /> 6410 0,�.. 0.23 0.23 P.E. N . 32257
<br /> ,... .. . ..:.. _. �.�m....�.,rw_...__�.. _.._ _.. -.�.. �........ ..».. ._,..���_..�. 6403.0 0.24 0.61
<br /> Note:Runoff volumes and peak inflows for this structure were calculated by SEDCAD program.
<br /> { 0.26 0.26
<br /> 6405 wz , 6405 6404.0 0.27 0.87 //+/l 7
<br /> 0.29•�G,-r_ -._ M,d m.w. .._ _ .._...a N .r.. _ . ...mm.-�. ..t...v..R.._ .. _ , r»n.F...._. ,.,. ., 6405 0 D 31 1 16 diment Yield Calculations DATE
<br /> 0 9 Se
<br /> 0.33 0.33 Rainfall Rainfall Annual
<br /> 6406.0 0.34 49 Source Area Factor Factor Sediment Sediment Sediment Sediment One Year
<br /> 6400 6400 North Ditch Profile 0.36 0.36 (ac) storm storm Into Pond Out of Pond Stored (Ra/Rs)(Sediment) Sediment Yield
<br /> 0+00 1+00 2+00 3+00 6420 , _- - - --- --�---- - -- 6420 6407.0 0.38 1.85 Rs ) ( ) 108
<br /> � 0.40 0.40 ( ) (Ra) (tons) (tons) (tons) (tons) ac-ft T R" 3124/17
<br /> 6408.0 0.41 2.25 111.7 14.9 19.0 69.1 0.0 69.1 88.0 0.05 Approved
<br /> 6415 64154�
<br /> 12 0 Ditch Bottom I TOTAL CAPACITY 2.25 ACRE-FEET(DESIGN) I Note:Sediment calculations were determined using SEDCAD program.
<br /> Premine Topography See SEDCAD model for individual watershed sedimentology parameters.
<br /> For these calculations sediment density was assumed to equal 78 Ib/cu ft. Page Exh. 7-23K 4
<br /> 6410 6410 0
<br /> 6400 _u.._w_. -� _ _,_.w.._ 6400
<br /> N
<br /> 0+00 1+00 2+00 3+00 4+00 5+00 HORIZONTAL SCALE 1" =100' Temporary Facilities Pond
<br /> 6405 wZ N 6405 VERTICAL SCALE 1" =20'
<br /> South Ditch Profile
<br /> Design
<br /> -.,., ,... 6440
<br /> 6400 6400
<br /> SCALE As No
<br /> O+OO 1+00 2+00 ��. ``_-�. .. � � � � � � DATE
<br /> 3
<br /> e ted
<br /> j g 11312017
<br /> ems, ...,,.-,,..a... ...�, .:..... .,,..-...m
<br /> CROSS-SECTION THROUGH IMPOUNDMENT impoundment _ , - °- . DRwG.BY. rcP
<br /> HORIZONTAL SCALE 1" Premine Topography APPROVED 8Y.
<br /> =50'
<br /> t � W E CoCOA
<br /> High Water LinegFer COMPANY
<br /> Eg�� DRwG NO.
<br /> s
<br /> VERTICAL SCALE 1 -10 9' oP o�.
<br /> - .... _a..:� � _ �-
<br /> 6420 ., .:;. _ ._ w. :._ - - _._ _.-. .w ., n ,.- .-.�_zT..v. .. .a..__... _. -.. -- - --__ w .._.. 6420
<br /> t E
<br /> m - Exh. 7-23
<br /> ��%PRODliCTI ..
<br /> _ t Colowyo Mine
<br /> ¢ ° k 5ee State Colorado
<br /> 1 4 Figure K2
<br /> � A' t Meeker,Colorado 81641
<br /> a
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<br /> 32
<br /> 4 No. REVISION DATE BY CHK
<br /> { S # S
<br /> 6400 ,. .. .,.-. ._.,�....�.�,.. ��...��-.�_.�.�.�..-»»-.. a�-_�. .�.__.�.. .�..m�-u_�..m_.�.»»...�.._ ,w.rw.�...,_.�._--.�.,»: 6400
<br /> 0+00 1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00 12+00 13+00 14+00 rR-1os New Drawing 1/1/17 TCP TT
<br /> Exh 7-23 FigK2PondDesign.dwg
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