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I�I <br /> i <br /> �r 7200 7200 <br /> EMBANKMENT CREST <br /> -7174.0 <br /> 7170 7170 <br /> ,s <br /> r..X <br /> 7140 7140 <br /> 7110 7110 <br /> o co co rn N LO 00 M c0 rn N L oo N o <br /> N N N co co M co LO LO lc? (0 <br /> PROFILE THROUGH IMPOUNDMENT <br /> / SCALE 1" =50' <br /> Profile Impoundment <br /> / <br /> Premine Topography� <br /> y <br /> EMBANKMENT DETAILS <br /> Scale 1" = 20' <br /> f <br /> k <br /> i5_a <br /> UPSTREAM DOWNSTREAM <br /> EMBANKMENT CREST <br /> �{ WALKWAY W 42"HANDRAILS AS SPECIFIED 7174.0 <br /> 18 inch d CMP <br /> >>T drains to 1 lower Ditch = PRINCIPAL SPILLWAY WITH NCRS ANTI-VORTEX TRASH RACK,EL.7170.0 <br /> RISER IS 18"DIA.GALV STEEL CMP, 14 GAUGE MIN. 2Q <br /> _. <br /> TWO 3"DIA.PERFORATIONS AT EL.7167.0 <br /> t <br /> 1 EMERGENCY SPILLWAY,EL.7172.0(TOP OF RIPRI <br /> IV NORMAL POOL <br /> EL.7167.0 EL. 7161.1 <br /> W"NRCS tick Dia CMP Riser <br /> 18"WATERMAN C-20 SLIDING GATE VALVE,EL,INVERT 7163.0 <br /> r ONE YEAR SEDIMENT ACCUMULATION,EL.7157.3 FLOW TO DITCH D1 LOWER <br /> EL.7155.0 <br /> Riprap taped in POND BOTTOM <br /> spillwa $0 cu.yds. f EL.7155.0 18"O GALV STEEL CMP,14 GAUGE MINIMUM, ANTISEEP COLLARS B FT(MIN) <br /> 2-213"X 112"HELICALLY CORRUGATED,POLYMER COATED THREE REQUIRED ON 20 FT CENTERS <br /> ,F TrT2 4 � AT 2.1°1°SLOPE <br /> 7170 <br /> r . <br /> f „ 0 <br /> / 1 <br /> w <br /> i <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 /> i-- 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 8 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 /> � 9 Y PP 9 <br /> laboratory testing. 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. Highly organic soils or <br /> 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(S to 12 inches loose thickness). The fill should be moisture conditioned to within 2 percent of optimum moisture content and coin act !to} p p p et at least 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 /> 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 /> 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 /> monitoring. <br /> 3. Hatched area of the spillway shall be riprapped with 12 inch median size material. <br /> N <br /> W E <br /> S <br /> AREA-LIf"IAPACITY TABLE ENGINEER'S CERTIFICATION SEC i" PR_4 <br /> (Revised following as-built survey) <br /> 1, THOMAS C. PETERSON, being a Approved on 818116 <br /> ELEVATION AREA AVERAGE AREA CAPACITY Licensed Professional Engineer in AUG 072015 <br /> INCREMENTAL CUMULATIVE the State of Colorado, do hereby <br /> (Feet) (Acres) (Acres) Acre-Feet (Acre-Feet)) certify that this map has been Division of declamation <br /> 7155.0 0.155 0.00 <br /> reviewed by me and Is true and Mining&Safety <br /> 7 0.17 correct to the best of my knowledge <br /> 7156.0 0.179 D.17 <br /> and information relying on work <br /> performed by others, and based on <br /> Sidehill Pond - PlanView7158.D 0.232 0 21 0.4� 0.58 information supplied by experts <br /> 11 <br /> identified in section 203.3 of the SIDEHILL IMPOUNDMENT <br /> Scale 1 = 50' 7160.0 0.292 a.26 a.52 1. 10 Colowyo Coal Company L.P. Permit. <br /> 0.33 0.65 DESIGN DRAWING <br /> 7162.0 0.359 1.75 <br /> SCAL7164.0 0.40 0.79 � �`�� � ' ® DATES. 111912015 <br /> Noted <br /> 6 0 0.433 2.54 ��• o� •,•...•,, F� •,� <br /> 0.4 7 D.95 ` `� •.••c,C p£T• s :• V DRWG.BY: TCP <br /> 7166.0 a.5 4 3,49 ; ��s; O : COAL APPROVED BY. <br /> T <br /> COMPANY �Y DRWG No. <br /> 0.56 1.11 4.60 <br /> / /1(/'� = 32257 Z: = s'F r�_ <br /> 7168.0 a.6D 1 4.6V PEOPLE PRODLCCIO'i <br /> �J Q T �O '7l311 C3 �� EXh. 7, Item 23 <br /> 0.64 1.28 ••� ••• Colowyo Mine Figure <br /> 7170.D 0.674 5. 8 I,, �� ••••••� G� �� See State Highway 4 LJ e C5 <br /> QQ � s � �� Meeker,Colorado 84649 aJ <br /> 0.73 1.47 /DNAL E ��� <br /> 7172.0 0.794 7.35 t No. REVISION DATE BY CHK <br /> THOMAS C PETERSON <br /> TOTAL CAPACITY 7.35 ACRE-FEET(DESIGN) P.E. No. 32257 PR-04 New Drawing 1120115 TCP KRB <br /> �l3 /1 Corrected typo regarding borrow,labeled culvert in plan <br /> Added Riser and label 7131115 TCP KRB <br /> DATE <br /> Paae Exh. 7-23C-10 <br />