2016-08-08_PERMIT FILE - C1981019 ‎(79)‎

• Permit No: C1981019
• IBM Index Class Name: Permit File
• Doc Date: 8/8/2016
• Doc Name: Middle Pond Design Drawing
• Section_Exhibit Name: Volume 18 Exhibit 7-23 Figure C8
• Media Type: M
• Archive: No

PROFILE THROUGH EMBANKMENT CENTERLINE
7110 SCALE 1" =50' 7110
II
7080 _
7080
Profile Impoundment
Premine Topography --- - - - 7050 7050
7020
7020
0 0 0 0 0 0 0 0 0 0 00
O co Co O N LID 00
r O O p O N N N co
7080
7080
7050 _
7050
p 7020
7020
i 6990
Riprap installed in 6990
spillway and grain o 0 0 0 0 0 0 0 0 o�0 to CIDo coN o
225 cu. ds.
O O O O •- r t`- N coN N co C"? co ct Ck �t
. tt1 � � CO
PROFILE THROUGH IMPOUNDMENT
_w _
SCALE 1" 501
�Oro
5
`. .., �
.. EMBANKMENT DETAILS
I Scale 1" = 20'
DOWNSTREAM s.0 UPSTREAM
EMBANKMENT CREST
EMERGENCY SPILLWAY
y WALKWAY W 42"HANDRAILS AS SPECIFIED
EL.7066.0,(TOP OF RIPRAP)
i k7 5
1 PRINCIPAL SPILLWAY WITH NCRS ANTI-VORTEX TRASH RACK
~<. i L.7161 A,RISER IS 18"DJA.GALV STEEL GMP, 14 GAUGE MIN.
TWO 3"DIA.PERFORATIONS,EL.7057.0
3 3 0 NORMAL POOL
ONE YEAR SEDIMENT ACCUMULATION,EL_7051.12
f 18"WATERMAN C-20 SLIDING GATE VALVE,EL.INVERT 7050.0
:..sV PDND BOTTOM
EL.7048.0
EL.7033.0
ANTtSEEP COLLARS 6 FT(MIN)
fi SIX REQUIRED ON 20 FT CENTERS
8 FT WIDE(MIN)KEYWAY 6 FT(MIN)iN DEPTH WITH 1 H:1 V SIDES
RIPRAP PROTECTION AND
g 12"PARSNALL FLUME AS SPECIFIED EXTENDING ACROSS ENTIRE ABUTMENT
BY FIELD ENGINEER FABRIC WRAPPED FILTER,TRANSPORT AND PLACE:
145 CUBIC YARDS OF CLEAN,OPEN-GRADED GRAVEL(MINUS 2 INCH)APPROX.8
TO 9 INCHES THICK,57 FEET IN LENGTH&EXTENDING ACROSS THE ENTIRE FOOTPRINT 1811 p GALV STEEL CMP, 14 GAUGE MINIMUM,APPROX 185 FT EXCLUDING BARREL
OF THE LOWER ONE OF DOWNSTREAM TOE AS DIRECTED. FILTER FABRIC 2-213"X 112"HELICALLY CORRUGATED,POLYMER COATED
SHALL BE MIRAFI 140N NON-WOVEN OR EQUIVALENT,AND SHALL COMPLETELY AT 9.1%SLOPE
SURROUND THE GRAVEL iN ALL DIMENSIONS. ALL FABRIC EDGES SHALL BE PROVIDED
WITH 3 FEET OF OVERLAP WITH ADJACENT EDGE.
,
f
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 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 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.
j Monitoring and Inspections:
Monitoring and inspections should be performed by qualified individuals as outlined in Colorado DRMS regulations.
I
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
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 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.
tio
ll
AREA-CAPACITY TABLE
(Revised fallowing as-built survey)
CAPACITY
ELEVATION AREA AVERAGE AREA INCREMENTAL CUMULATIVE
(Feet) (Acres) (Acres)
(Acre-Feet) (Acre-Feet) PR-4
ENGINEERS CERTIFICATION Approved on 818/16
�f
7048.0 0.02 0.00 I, THOMAS C. PETERSON, being a
0.03 0.06 Licensed Professional Engineer in AUG 0 `20
7050.0 0.04 0.06 the State of Colorado, do hereby 15
Di
0.06 0, certify that this map has been visie�ri®f t ,
7052.0 0.07 0.17 reviewed by me and is true and Mi�'i'�9 Safety
0.08 0.17 correct to the best of my knowledge etY
7054.0 0.10 0.34 and information relying on work
0.12 0.24 performed by others,and based on
7056.0 0.14 0.58 information supplied by experts
0.16 0.32 ►dentified in section 2.03.3 of the MIDDLE POND
7058.Q 0.18 0.9� Colo Coat Company L.P. Permit.
DESIGN DRAWING
0.21 0.42
7060.0 0..24 1.33
SCALE: As Noted
7062.0 0.31 1.88 `��� P • C'F DATE: 111912015
0.36 0.71 i` •s�. Pe;";�� `� �' U' DRWG.BY: TCP
7064.0 0.40 2.59 • • F' • COAL L/ APPROVED BY.00
.� o . F . f
0.45 0.9Q _ U :�- 32257 Z: © - tiR�E COMPANY DRWG NO.
7os6.0 0.50 4
� • • � f'LE-PRODCCTI.---
= 7/3 r/rS; _ EX . 7-23
j00- 0� •• i / Colawyo Mine �1/'V�
�� ••••••••••• �� 5731 State Highway 13 �� ,i�� i _TS
Meeker,Colorado 81641 a.� V
ION 1#
No. REVISION DATE BY CHK
THOMAS C PETERSON
w E TOTAL CAPACITY 3.49 ACRE-FEET(DESIGN) P.E. No. 32257 PR-04 New Drawing 1120115 TCP KRB
- ` s Corrected ore ard�n borrow
Middle ond
Modified interior darn slope face to 3H:1V,added Riser 7131115 TCP KRB
Iddle Pond S
Scale 1" = 50' DATE
Page Exh. 7-23C-13