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PROFILE THROUGH EMBANKMENT CENTERLINE <br /> 6900 SCALE 1" =50' 6900 <br /> r I <br /> emu.. <br /> s <br /> 6870 -.� ..: .. 6870 <br /> n. <br /> Profile Impoundment 6840 6840 <br /> Premine Topography -� oo c� coo CZcov aoo 0 <br /> + + + + + + + + <br /> 0 o O o N <br /> 69.30 _ __ _._ _ <br /> 6930 } <br /> 4 <br /> 6900 <br /> 6900 <br /> 3 <br /> 6870 s �. <br /> 6870 <br /> h <br /> [ S <br /> +3. <br /> 3 <br /> 8 f E <br /> a 6840 <br /> 6840 - <br /> 6810 6810 <br /> o O o 0 0 0 0 0 0 o O o 0 0 0 0 0 0 <br /> O M cp O N LO 00 co Co O N LO c0 �- <br /> + + + + + + + + + + + + + + + + + + <br /> =•, O O O O •- ,- •- N N N C+) CV) co LO <br /> PROFILE THROUGH IMPOUNDMENT <br /> SCALE 1"' =50' <br /> r; <br /> f <br /> r, <br /> EMBANKMENT DETAIL <br /> Scale 1" = 20' <br /> t <br /> 0 <br /> x <br /> eta DOWNSTREAM UPSTREAM <br /> Riprap installed in EMBANKMENT CREST <br /> spillway and groin 6880.0 <br /> r, 150 cu.yds. i EMERGENCY SPILLWAY <br /> EL.6875.0,(TOP OF RIPRAP) WALKWAY W 42"HANDRAILS AS SPECIFIED <br /> e8� S7 18"PRINCIPAL SPILLWAY WITH NCRS ANTI-VORTEX TRASH RACK <br /> \. <br /> - EL.6872.0,RISER IS 18"DIA.GALV STEEL CMP, 14 GAUGE MIN. <br /> TWO 3"DIA.PERFORATIONS PER ELEVATION AS SPECIFIED <br /> {` EL 68680(LOWEST PERFORATION) <br /> GBjs:y l.' j i r 3 3 <br /> RI ® AKRMAL POOL <br /> 1 1 <br /> oo/� PRAP PROTECTION AND <br /> �r' f <br /> 12"PARSHALL FLUME AS SPECIFIED <br /> BY FIELD ENGINEER ONE YEAR SEDIMENT ACCUMULATION,EL.6859.85 <br /> EL 7050.0 24 WATERMAN C-20 SLIDING GATE VALVE,EL.INVERT 685 7.0 <br /> a <br /> / X POND BOTTOM <br /> w P r tr EL.6855.0 <br /> f �' <br /> f � p, ORiG.GROUND <br /> ANTISEEP COLLARS 6 FT(MIN) EL.6855.12 <br /> ✓ �f FIVE REQUIRED ON 20 FT CENTERS <br /> / f 8 FT WIDE(MIN)KEYWAY 6 FT(MIN)IN DEPTH WITH 1 H:1 V SIDES <br /> EXTENDING ACROSS ENTIRE ABUTMENT <br /> I r FABRIC WRAPPED FILTER,TRANSPORTAND PLACE: <br /> 103 CUBIC YARDS OF CLEAN,OPEN-GRADED GRAVEL(MINUS 2 INCH)APPROX.8 <br /> TO 9 INCHES THICK,57 FEET IN LENGTH&EXTENDING ACROSS THE ENTIRE <br /> FOOTPRINT <br /> OF THE LOWER ONE-THIRD OF DOWNSTREAM TOE AS DIRECTED. FILTER FABRIC <br /> " <br /> J SHALL BE MIRAFI 140N NON-WOVEN OR EQUIVALENT,AND SHALL COMPLETELY 2-2�"X�/2"HELICALLY�CORRUGATED,POLYMER COATED FT <br /> SURROUND THE GRAVEL IN ALL DIMENSIONS. ALL FABRIC EDGES SHALL BE PROVIDED AT 3.6%SLOPE <br /> WITH 3 FEET OF OVERLAP WiTH ADJACENT EDGE. <br /> f , ; <br /> Site Preparation: <br /> Prior to placing fill,the area should be stripped of organic topsoil or other deleterious materials. <br /> Acceptable Fill Materials: <br /> Suitable fill materials can be obtained from and 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 es SC,CC,CL and CH. Bedrock materials should be <br /> P Y types( ) <br /> G J <br /> processed to produce a soil Like material with maximum article size of 6 inches. The materials used as embankment fill should have at least 25 percent fines(material finer than No.200 sieve). The Feld engineer may approve the use of other materials following appropriate <br /> b� cj� 9 �o ,; P P P <br /> $� laboratory testing. Unnacceptable Fill Materials: <br /> 6 / <br /> Materials not considered suitable for use as embankment fill include cleaner sand and ravel. 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 <br /> 9 P 9Y 9Y 9a <br /> ,f materials containing construction debris are also not acceptable. Frozen soil is not acceptable. <br /> Fill Placement and Compaction: <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 feast 95 percent of standard proctor maximum dry density(ASTM D 698). The <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. <br /> - i Monitoring and inspections: <br /> Monitoring and inspections should be performed by qualified individuals as outlined in Colorado DRMS regulations. <br /> Construction Notes: <br /> 1. See Map 41 B for general location and associated drainage areas. <br /> 2. Embankment to be constructed of compacted fill using materials specifed by field engineer. Refer to <br /> f m to Exhibit 7, Item 20, Part F for Geotechnical Information and compaction specifications. Figure 3 of <br /> that document contains requirements for site preparation, fill materials,placement requirements, and <br /> Y monitoring. <br /> -`--- 6- 3. Hatched area of the spillway and outlet section along groin shall be riprapped with 12 inch median <br /> -' t size material. <br /> 4. Upon obtaining acceptable laboratory results on borrow material samples, the fabric wrapped drain shown <br /> above may be modified or deleted at the discretion of the design engineer, <br /> 4 <br /> r f <br /> AREA-CAPACITY TABLE RECI=ivEn <br /> `. (Revised following as-built survey) <br /> ELEVATION AREA AVERAGE AREA CAPACITY AUG1 <br /> '', -•,i <br /> INCREMENTAL CUMULATIVE <br /> (Feet) (Acres) (Acres) <br /> (Acre-Feet) (Acre-Feet) ion Divis of�E.c;,C-'!'�,�ation, <br /> ENGINEER'S CERTIFICATION i <br /> 6855.D 0.05 0.00 9&safe <br /> nn,n��, <br /> 1 THOMAS C. PETERSON being a P R-4 Y <br /> b <br /> , 0.08 0.16 g <br /> Licensed Professional Engineer in approved on 81$116 <br /> 6857.0 0.11 0.16 <br /> the State of Colorado, do hereby <br /> 30 <br /> N 6859.0 0.19 0.15 0. 0.46 certify that this map has been <br /> �,45 reviewed by me and is true and <br /> 0.22 <br /> correct to the best of my knowledge <br /> w E <br /> 6861.0 0.26 0.91 <br /> and information retying on work <br /> 0.31 0.62 <br /> __.._.. performed by others, and based on <br /> 6863.0 0.35 1.52 <br /> _ information supplied by experts <br /> s 0.40 0.79 SECTION 25 POND <br /> Identified in section 2.03.3 of the <br /> 6865.0 0.44 2.32 <br /> 0.49 0.98 Colowyo Coal Company L.P. Permit. DESIGN DRAWING <br /> ° 6867.0 0.54 3.30 <br /> 0.59 1.19 �1r1i1llrr1 <br /> `��1►� /I SCALE: As Noted <br /> 6869.0 0.65 4.49 <br /> 1 PQ d L /C Ij� � DATE: 1/19/2015 <br /> •!!•• <br /> _ <br /> 0.70 1.41 `�► O !•!• ••!! I�� 1V' DRWG.BY: TCP <br /> 6871.0 0.76 5.90 ! s FT . �' • <br /> r� �+ p ! �Q. P F� • �n COAL APPROVED BY. <br /> O.BG .U4 V 0 Z O Q s�E�r. �b4�Y DRWG NO. <br /> COMPANY <br /> 6873.0 0.88 7.54 <br /> -...... - � ! • � �.EOPLR-PRODUCCIO'V-. <br /> 32257 <br /> 0.95 1.90 = Exh. 7-23 <br /> Q 9.44 <br /> �( �! �!9,����J'!� � : Colowyo Mine . � <br /> 68 75.0 1.02 9.44 � •f` •!• ••• �� 5731 State Highway 13 Figure i.�! e C9 <br /> !!!!!!• \ ♦ Meeker,Colorado 81641 `+ <br /> 0NAL <br /> ! 111 No. REVISION DATE BY CHK <br /> -- TOTAL CAPACITY 9.44 ACRE-FEET(DESIGN) THOMAS C PETERSON <br /> P.E. No. 32257 New Drawing 1/20115 TCP KRB <br /> PR-04 <br /> Section 2 5 Pond odified i tenor dam to face to 3H:1 V,added Riser 7/31/15 TCP KRB <br /> ?13!// Corrected o re ardn �orrow <br /> Scale 1" = 50' HATE <br /> Page Exh. 7-23C-14 <br />