2016-08-08_PERMIT FILE - C1981019A (67)

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PROFILE THROUGH EMBANKMENT CENTERLINE 7020 SCALE 1" =50' 7020 6990 6990 Profile Impoundment Premine Topography fi960 6960 o Cl) o rn a 00 0 0 0 0 04 CV 04 ii j 7020 7020 6990 �-- `" 6990 6960 -�. 6960 6930 6930 O CO) 04 00 co c0 CA CV LO 00 CV CV co co CV Cn `t 'ct PROFILE THROUGH IMPOUNDMENT SCALE 1" =50' _ j EMBANKMENT DETAIL S 1 Scale 1" = 20' DOWNSTREAM 15 UPSTREAM ap .q. p EMBANKMENT CREST 7000.0 WALKWAY W 42"HANDRAILS AS SPECIFIED l ..., �.,..�- EMERGENCY SPILLWAY PRINCIPAL SPILLWAY WITH NCRS :..,. Y, EL.6995.0,(TOP OF RIPRAP) ANTI-VORTEX TRASH RACK EL.6993.0 RISER IS 18"DIA.GALV STL'EL CMP, 14 GAUGE MIN. Riprap ins t,Iled in TWO 3"DIA.PERFORATIONS AS SPECIFIED 5�a EL.6991.0{LOWEST PERFORATION) spillway ` p' y an` groin � v NORMAL POOL 6980 = 225 cu.yds _ 3 3 ONE YEAR SEDIMENT STORAGE 6990 j69 0.25 AC-FT,ELEV.6983.9 EL INVERT 6980 0 SLIDING GATE VALVE 18"WATERMAN C 20 E 8995-1 . POND BOTTOM EL.6978.0 - " 7000 ANTISEEP COLLARS 6 FT(MIN) -7000 _... SIX REQUIRED ON 20 FT CENTERS RIPRAP PROTECTION AND EL.6955.0 i 12"PARSHALL FLUME AS SPECIFIED 8 FT WIDE(MIN)KEYWAY 6 FT(MIN)IN DEPTH WITH 1H:1V SIDES BY FIELD ENGINEER ' EXTENDING ACROSS ENTIRE ABUTMENT ''4 r 18"a GALV STEEL CMP, 14 GAUGE MINIMUM,APPROX 200 FT EXCLUDING BARREL - - 2-213'X 112 HELICALLY CORRUGATED,POLYMER COATED - _---- AT 10.5%SLOPE .. _ FABRIC WRAPPED FILTER,TRANSPORT AND PLACE: 128 CUBIC YARDS OF CLEAN,OPEN-GRADED GRAVEL(MINUS 2 INCH)APPROX 8 --- TO 9 INCHES THICK,69 FEET IN LENGTH&EXTENDING ACROSS THE ENTIRE FOOTPRINT i P c OF THE LOWER ONE-THIRD OF DOWNSTREAM TOE AS DIRECTED, FILTER FABRIC SHALL BE MIRAFI 140N NON-WOVEN OR EQUIVALENT,AND SHALL COMPLETELY SURROUND THE GRAVEL IN ALL DIMENSIONS. ALL FABRIC EDGES SHALL BE PROVIDED WITH 3 FEET OF OVERLAP WITH ADJACENT EDGE. Site Preparation: - - Prior to placing fill,the area should be stripped of organic topsoil or other deleterious materials. Acceptable Fill Materials: Suitable fill materials can be obtained from pond excavations or from nearbyborrow sources. Suitable materials include native clay soils clayey sand soils,and bedrock materials which are broken down to these soil f es SC,CC,CL and CH. Bedrock materials should be Y Y Y rP ( ) A., 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 en ineer may approve the use of other materials following appropriate 9 9 laboratory testing. Unacceptable Fill Materials: 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 so' g P 9 hr 9 Y 9a soils or 'l, materials containing construction debris are also not acceptable. Frozen soil is not acceptable. t - 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. Monitoring and inspections: Monitoring and inspections should be performed by qualified individuals as outlined in Colorado DRMS regulations. Construction Notes: 1. See Map 41 B for general location and associated drainage areas. 2. Embankment to be constructed of compacted fill using materials specifed by field engineer. Refer to p"} to Exhibit 7, Item 20, Part F for Geotechnical information and compaction specifications. Figure 3 of I that document contains requirements for site preparation, fill materials,placement requirements, and t., monitoring. 3. Hatched area of the spillway and outlet section along groin shall be riprapped with 12 inch median size material. 4. Upon obtaining acceptable laboratory results on borrow material samples, the fabric wrapped drain shown above may be modified or deleted at the discretion of the design engineer. AUG0 Z � AREA-CIII 1-1 TY TABLE ENGINEER'S CERTIFICATION ®;Vs;o _ `®15 r1w (Revised following as-built survey) 1, THOMAS C. PETERSON, being a Mrrrrn9& rrati n, CAPACITY _ Licensed Professional Engineer in PR-4 Safety ° ELEVATION AREA AVERAGE AREA INCREMENTAL CUMULATIVE the State of Colorado, do hereby (Feet) (Acres) (Acres) Approved on 8/8116 (Acre-Feet) (Acre-Feet) certify that this map has been reviewed by me and is true and 6978.0 0.02 0.00 correct to the best of my knowledge 0.02 0.05 and information relying on work 6980.0 0.03 0.05 performed by others, and based on y 0.05 0.09 information supplied by experts 6982.0 0.06 0.14 identified in section 2.03.3 of the SECTION 26 POND 6984.0 0.09 0.08 0.15 0.29 Colowyo Coal Company L.P. Permit. DESIGN ,DRAWING 0.11 0.23 6986.0 0.13 0.52 ��>r��t��r�>,�i��i 0.16 0.31 S' p L, � SCALE. As Noted `� �A C F �r� ,, 6988.0 0.18 0.83 2% o •,,........ +� DATE _-1/19/2015 0.21 1 0.42 ti ;5 DRWG.BY: TCP N 6990.0 0.24 1.25 = �' :o ``�J►: �o COAL APPROVED BY v ' 32257 Z; = sF eoMPANY " Eo r Y' 0.27 0.54 = ti �Tr ORGY DRWG NO. � -...PLL-PROpUCCI�. W E 6992.D 0.30 1.79 7/3r/I�: Exh. 7 Item 23 0.34 0.67 � 0:kN •• •• ��: Colowyo Mine . 7 �j ••••••••• \ 5731 State Highway 13 Figure C6 6994.0 0.37 2.46 �� SS t.\� `�, Meeker,Colorado 81641 `'` s D.39 0.39 �i�� oNAt 6995.0 0.41 2.85 No. REVISION DATE BY CHK THOMAS C PETERSON TOTAL CAPACITY 2.85 ACRE-FEET(DESIGN) P.E. No. 32257 New Drawing 1120115 TCP KRB PR-04 Modified interior dam slope face to 3HAV,added Riser Section 26 Pond - Plan View -771 J? 1 //-SP Corrected typo regarding borrow 7131115 TCP KRB Scale 1" = 50' - DATE Page Exh. 7-23C-11