2020-11-19_PERMIT FILE - C1980007 ‎(3)‎

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 11/19/2020
• Doc Name: South Prong Restoration Plan
• Section_Exhibit Name: Exhibit 80 TR-148 South Prong Restoration Plan
• Media Type: D
• Archive: No

S (DUTH PRC3NC; STREAM RESTC3RATIC3N
PLAN
MC:) UNTAIN COAL COMPANY LLC WEST ELK MINE
GENERAL NOTES PROJECT LOCATION CONTACTS
OWNER:
MOUNTAIN COAL COMPANY, LLC CONTACT: KATHY WELT
1. THE SOUTH PRONG STREAM RESTORATION PLAN PROVIDES INFORMATION REGARDING THE APPROACH TO RESTORE THE STREAM WEST ELK MINE 970-929-2238 (OFFICE)
CORRIDOR OF SOUTH PRONG CREEK AND THE NORTH FORK OF SOUTH PRONG CREEK TO ITS HISTORICAL CONDITION, PRIOR TO THE SUBSIDENCE WITHIN 5174 HIGHWAY 133
THE PROJECT AREA. THE PLAN INCLUDES TYPICAL STREAM DIMENSION, ALIGNMENT, PROFILE, SUBSTRATE MATERIAL, AND REVEGETATION PLAN TO SOMERSET, CO 81434 JESSICA WILCZEK, P.E.
RE-ESTABLISH BOTH SOUTH PRONG AND THE NORTH FORK OF SOUTH PRONG CREEK TO THEIR NATURAL STATE. THE RESTORATION PLAN HAS BEEN 970-929-2308 (OFFICE)
DEVELOPED FROM THE UNDISTURBED AND STABLE UP-AND DOWNSTREAM REACHES FROM THE PROJECT AREA. THE PLAN WILL TIE INTO THE STABLE AND
UNDISTURBED STREAM UP-AND DOWNSTREAM OF THE PROJECT. ENGINEER:
WRIGHT WATER ENGINEERS, INC. CONTACT: DRAKE LUDWIG, P.E.
2. CONSTRUCTION OF THE STREAM RESTORATION PLAN SHALL BE DONE ONLY IN THE PRESENCE OF THE ENGINEER. THE PLAN PROVIDES THE Somerse-, 818 COLORADO AVENUE 970-945-7755 (OFFICE)SUITE 307
OVERALL RESTORATION APPROACH, HOWEVER SOME 'FIELD FITTING' IS EXPECTED TO BE REQUIRED TO MAINTAIN CONTINUITY BETWEEN THE REACHES UP - GLENWOOD SPRINGS, CO 81602
AND DOWNSTREAM OF THE PROJECT AREA. THE CONTRACTOR IS REQUIRED TO HAVE A SET OF THESE PLANS ON-SITE AT ALL TIMES.
3. HYDROLOGIC DATA USED TO INFORM THE STREAM RESTORATION DESIGN HAD BEEN COLLECTED FROM A NEARBY GAGE STATION ALONG
SOUTH PRONG CREEK. THIS GAGE COLLECTED SEASONAL RUNOFF DATA FROM 2018 TO 2020. THIS DATA, IN CONJUNCTION WITH FIELD SURVEY AND
HYDRAULIC COMPUTATIONS, WAS USED TO DEVELOP THE DESIGN LOW FLOW AND BANKFULL FLOW RATES, 1 CFS AND 13 CFS FOR SOUTH PRONG CREEK, SHEET INDEX
AND 0.5 CFS AND 3 CFS FOR THE NORTH FORK OF SOUTH PRONG CREEK, RESPECTIVELY.
4. A GEOMORPHIC ASSESSMENT OF THE UP-AND DOWNSTREAM REACHES WAS COMPLETED. THE REACH OF SOUTH PRONG CREEK UPSTREAM _ TS01 TITLE SHEET
OF THE PROJECT AREA WAS FOUND TO BE CONTROLLED BY BEDROCK AND THEREFORE THE DOWNSTREAM REACH DIMENSION WAS USED IN DEVELOPING
THE RESTORATION PLAN. THE REACH OF SOUTH PRONG CREEK DOWNSTREAM OF THE PROJECT AREA WAS FOUND TO BE MODERATELY ENTRENCHED, PROJECT HZ01 HORIZONTAL CONTROL AND GRADING PLAN
HAVE A RELATIVELY STEEP SLOPE, AND CONSIST PREDOMINANTLY OF GRAVEL SUBSTRATE WITH SOME INTERMITTENT LARGER MATERIAL. THESE STREAM LOCATION PP01 SOUTH PRONG CREEK PLAN & PROFILE
CHARACTERISTICS ARE CONSISTENT WITH THOSE OF A ROSGEN TYPE B4 STREAM TYPE. THE CHANNEL DIMENSION AND LAYOUT SHOWN IN THIS PLAN IS
REPRESENTATIVE OF THIS STREAM TYPE AND HAS BEEN DEVELOPED FROM SURVEYED DATA OF THE DOWNSTREAM REACH. PP02 NORTH FORK OF SOUTH PRONG CREEK PLAN & PROFILE
5. THE PLAN INCLUDES REVEGETATION OF THE STREAM BANKS AND THE UPLAND AREAS WITHIN THE LIMITS OF DISTURBANCE TO DT01 TYPICAL SECTION
RE-ESTABLISH THE HISTORICAL SITE CONDITIONS AND PROVIDE ECOLOGICAL BENEFIT. _. DT02 SECTION DIMENSIONS
6. THE PROJECT AREA IS CONTAINED ENTIRELY ON THE PROPERTY OWNED BY MOUNTAIN COAL COMPANY, LLC. �\ MAP SOURCE: BING MAPS, 2020 DT03 REVEGETATION DETAILS
10000 0 10000 20000 FT ©2020 TOMTOM ©2020 HERE
7. THE WEST ELK MINE WILL OBTAIN ALL REQUIRED PERMITS FOR THIS WORK. NORTH
8. THE EXISTING TOPOGRAPHIC SURVEY INCLUDED IN THIS RESTORATION PLAN WAS PROVIDED BY AECOM (TEL. [phone]) ON OCTOBER 23,
2020. THE EXISTING TOPOGRAPHY REFLECTS THE CONDITION OF THE SITE AFTER THE SUBSIDENCE AREA HAD BEEN FILLED. CONTACT THE SURVEYOR
FOR PROJECT BENCHMARK AND BASIS OF BEARINGS.
w
w
U)
w
J
C�
/
W
W
W
S
N
_I
O
Q
U
N
/
N
M
O
CALL COLORADO
00
1-1
W
811
3: OR CALL UTILITY NOTIFICATION
c�
CENTER OF COLORADO
1 -800-922-1987
CALL 3-BUSINESS DAYS IN ADVANCE
r? BEFORE YOU DIG, GRADE, OR EXCAVATE
_o FOR THE MARKING OF UNDERGROUND
MEMBER UTILITIES
0
0
N
o COMMENTS DATE JOB NO.
N N0. BY DATE DESCRIPTION DESIGN DTL 10/28/20 SOUTH PRONG STREAM RESTORA T/ON PLAN 831-032.921
WRIGHT WATER ENGINEERS, INC. ---- DETAIL DTL 10/28/20 REVISION NO.
2490 W. 26TH AVE. SUITE 100A __ - ---- ---- CHECK SIDS 10/28/20
E "A&f DENVER CO 80211 __ APPROVAL ----
[phone] FAX[phone] -- ---- ---- ---- SCALE SHOWN TITLE SHEET
SHEET NO.
--
o __ ---- TS.dwg TS01
0