NC0004961_Appx E - Supporting Documents_20171031

2017 Comprehensive Site Assessment Update October 2017
Riverbend Steam Station
APPENDIX E
SUPPORTING DOCUMENTS
Stantec Report
WSP Maps
SynTerra

2017 Comprehensive Site Assessment Update October 2017
Riverbend Steam Station
STANTEC REPORT
SynTerra

A
12-inch Diameter HDPEb
Submerged Primary Pond Outlet (Riverbend-9)
Pipe Unknown Origin Primary Pond Drop Inlet with Stop Logs
1,kN,36-inch Diameter
Secondary Dike Decant CMP Outlet
Riser Structure
e' z 7 'A,
�a
Gd�d� 36-inch Diameter CMP
(Riverbend-4) PRIMARY POND
(Reportedly Abandoned)
36-inch Diameter Cinder Pit Discharge 18-inch Diameter CMP
SW008 Outlet (Riverbend-6) (Riverbend-8)
(See Figure 3, Photograph No. 7) (See Figure 2, Photgraph Nos. 2 and 3)
Cinder Pit
Cinder Pit CMP Riser 20-inch Diameter CMP
(See Figure 2, Photograph N-o. 6) (Riverbend-7)
(See Figure 2, Photograph Nos. 4 and 5)
24-inch Diameter CMP
STORMWATER POND a� Coal Yard -100 (Riverbend-5)
t= Ash Stack
18-inch Diameter RCP Outlet - Unknown Origin
y (Riverbend-3)
15-inch Diameter
er CPP (See Figure 3, Photograph No. 10)
(Riverbend-1)
(See Figure 3, Photograph Nos. 8 and 9) i4
it RETENTION POND
t
e 18-inch Diameter CMP Inlet
(Riverbend 2)
4
(See Figure 2, Photograph No. 1) =f _
Revision No. Date Description

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Photograph No. 1:
18-inch diameter CMP Ash Fill drain pipe No. 1 inlet.
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Photograph No. 4:
20-inch diameter CMP Ash Fill drain pipe inlet.
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AM I
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Photograph No. 2:
18-inch diameter CMP Ash Fill drain pipe No. 2 inlet.
Photograph No. 5:
20-inch diameter Steel Ash Fill drain pipe outlet.
DRAFT
Photograph No. 3:
18-inch diameter Steel Ash Fill drain pipe No. 2 outlet.
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Photograph No. 6:
CMP Cinder Pit riser.
Client/Project
Parker Poe Adams & Bernstein LLP /
Duke Energy Non-CCB Impoundment Pipe Inspection
Site Scouting
Figure No.
2 - Observation Photographs
Title
RIVERBEND STEAM STATION
Gaston County,
North Carolina

Photograph No. 7:
36-inch diameter CMP Cinder Pit outlet.
Photograph No. 10:
18-inch diameter RCP outlet unknown origin.
Stantec
Photograph No. 8:
15-inch diameter CPP Coal Pile drain.
4 DDD
,4
s-
Photograph No. 9:
Assumed outlet of Coal Pile drain.
Client/Project
Parker Poe Adams & Bernstein LLP /
Duke Energy Non-CCB Impoundment Pipe Inspection
Site Scouting
Figure No.
3 - Observation Photographs
Title
RIVERBEND STEAM STATION
Gaston County,
North Carolina

Legend
Sta ntec O Photograph Observation Point
Notes
1. Coordinate System: WGS 1984 Web Mercator Auxiliary Sphere
2. Aerial Source:
.Image obtained from Google Earth Professional on: 07/11/2014
Imagery Date: 11/09/2013 Stantec License Key: JCPMX84H47PH7HT
3. Issues Defined In Station Report
Caldwell exander ul
Davie
Iredell Davidson
Burke North
Catawba 1 Randolph
Carolina
Lincoln
Cabarrus
Gaston Stanly
Cleveland Mecklenburg Nlontg=ery
Cherokee chmmd
South Yor
Carolina Anson
Union Lancaster esterField Mar oro
July 2014
Project No. 175664006
Client/Project
Duke Energy Ash Pond Pipe
Inspection
Figure No.
1 - Site Plan
Title
RIVERBEND STEAM STATION
Gaston County, North Carolina

Photograph No. 1:
Primary Pond Outlet (Dewatered).
July 2014
Project No. 1 756640 06
Sta ntec
Client/Project
Duke Energy Ash Pond Pipe
Inspection
Figure No.
2 - Observation Photographs
Title
RIVERBEND STEAM STATION
Gaston County, North Carolina

(3 Stantec
Notes
1. Coordinate System: WGS 1984 Web Mercator Auxiliary Sphere
2. Aerial Source:
Image obtained from Google Earth Professional on: 07/11 /2014
Imagery Date: 11/09/2013 Stantec License Key: JCPMX84H47PH7HT
3. Issues Defined In Station Report
Q
Stability/Seepage
Pipes/Outlet Structures
Maintenance
General Observation
Instrumentation
M Stability/Seepage Area
Pipes/Outlet Structures Area
Maintenance Area
Caldwell exander ul efd
Davie
Iredell Davidson
Burke Catawba North Randolph
Carolina
Lincoln
Cabarrus
Gaston Stanly
Cleveland Mecklenburg Nlontg=ery
Cherokee chmmd
South York
Carolina Anson
Union Lancaster esterField Mar oro
JWy 2014
Project No. 175664005
Client/Project
Duke Energy CCB Impoundment
Field Reconnaissance
Figure No.
1 - Site Plan
Title
RIVERBEND STEAM STATION
Gaston County, North Carolina

Photograph No. 1:
Active plant sump lines, inactive sluice lines.
WIN
i
4
Photograph No. 4
Possible seep with ponding water.
Stantec
Photograph No. 2:
Surface slough, lacks vegetation.
is k pl`
Wi
, '1,
.'
ror ,il�.tPl
A. u Aki
p
3 ?
Photograph No. 5:
Artesian flow through monitoring well.
Photograph No. 3:
Ponding water in bench ditch.
Photograph No. 6:
Sedimentation in rip -rap, ponding water.
July 2014
Project N o. 175664005
Client/Project
Duke Energy CCB Impoundment
Field Reconnaissance
Figure No.
2 - Observation Photographs
Title
RIVERBEND STEAM STATION
Gaston County, North Carolina

Photograph No. 7:
12-inch diameter HDPE pipe - unknown origin.
w J Jn�yf r• X(K SR .... :C-ram'+
-:0
Photograph No. 10:
Submerged outlet from Primary Pond.
Stantec
Photograph No. 8:
Primary Pond drop inlet with stoplogs.
Photograph No. 11:
Rutting and overly steepened slopes (1.61-1:1V).
Photograph No. 9:
Dense vegetation, beaver activity.
Photograph No. 12:
Possible seep beyond north toe of Secondary Dike.
July 2014
Project No. 175664005
Client/Project
Duke Energy CCB Impoundment
Field Reconnaissance
Figure No.
3 - Observation Photographs
Title
RIVERBEND STEAM STATION
Gaston County, North Carolina

Photograph No. 13:
Possible seep and erosion.
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a01
Photograph No. 16:
Rip -rap lacking bedding stone.
(3 Stantec
Photograph No. 14:
Ponding water in bench ditch.
ti
i,
Photograph No. 17:
Possible seepage from blanket drain system and rainfall.
Photograph No. 15:
Settlement of wave protection, sparse vegetation.
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AI
Photograph No. 18:
Secondary Pond drop inlet with stoplogs.
July 2014
Project No
175664005
Client/Project
Duke Energy CCB Impoundment
Field Reconnaissance
Figure No.
4 - Observation Photographs
Title
RIVERBEND STEAM STATION
Gaston County, North Carolina

Photograph No. 19:
Secondary Pond outfall structure.
Photograph No. 22:
Ponding of surface water runoff.
(:�' Stantec
w
Photograph No. 20:
Flowing spring near Secondary Pond outfall ditch.
Photograph No. 23:
Ponding water on bench of Intermediate Dike
interior to Secondary Pond.
Photograph No. 21:
Dense vegetation in Secondary Pond.
Ju y 2014
Project No. 175664005
Client/Project
Duke Energy CCB Impoundment
Field Reconnaissance
Figure No.
5 - Observation Photographs
TRIP
RIVERBEND STEAM STATION
Gaston County, North Carolina

2017 Comprehensive Site Assessment Update October 2017
Riverbend Steam Station
WSP MAPS
SynTerra

GENERAL NOTES " !
RIVERBEND STEAM STATION
1. BASIS OF BEARINGS: NC GRID NAD83/2011. ( o
TOPOGRAPHIC AND PLANIMETRIC CERTIFICATION m
I, DAVID K. BRUBAKER, CERTIFY THAT THIS PROJECT WAS COMPLETED UNDER MY DIRECT 2. ELEVATIONS ARE BASED ON NAVD88.
AND RESPONSIBLE CHARGE FROM AN ACTUAL SURVEY MADE UNDER MY SUPERVISION; MOUNT HOLLY, GASTO N COUNTY N.C.
THAT THIS AIRBORNE SURVEY WAS PERFORMED AT THE 95 PERCENT CONFIDENCE LEVEL 3. THIS MAP IS NOT A BOUNDARY SURVEY, PROPERTY LINES SHOWN HEREON PER GASTON COUNTY GIS AND ARE FOR REFERENCE ONLY. o,
TO MEET FEDERAL GEOGRAPHIC DATA COMMITTEE STANDARDS; THAT THIS SURVEY WAS \ \ -\ i \ �/ i // '� '� � R
PERFORMED TO MEET THE REQUIREMENTS FOR A TOPOGRAPHIC/PLANIMETRIC SURVEY TO i j / \ - _ _ �\ f / / 4. THE PLANIMETRIC LOCATION ON THIS MAP IS BASED ON PHOTOGRAMMETRIC MAPPING OF IMAGERY COLLECTED ON APRIL 17, 2014. [ALTITUDE INLL
THE ACCURACY OF CLASS A AND VERTICAL ACCURACY WHEN APPLICABLE TO THE j I I / / ( \ I ! - j I / OF SENSOR = 3,600' / SENSOR FOCAL LENGTH = 153.558mm] THE IMAGERY CAPTURED IS SUITABLE TO CREATE 1 "=100' SCALE MAPPING CATWABA RIVER I a
CLASS C STANDARD, AND T THE ORIGINAL DATA WAS OBTAINED ON APRIL 17, 2014; / / ' 1 ' 1 z E E
I / / ! / i.' , / ��\vl (( AND CONTOURS AT AN INTERVAL OF 2', AND MEETS THE NATIONAL MAP ACCURACY STANDARDS FOR 1"=100' SCALE MAPPING. DATA �� MOUNTAIN ISLAND LAKE �8 Z
THAT THE SURVEY WA OMPLE ON JUNE 12, 2WRE),
lAlTj�j�1�VTOURS SHOWN AS I I /� / I 1 ( , !:% , / , I I PROVIDED WHERE CLEAR AND VISIBLE ON THE IMAGERY IS WITHIN 2' OF ITS TRUE POSITION. co d. d
BRO AY N T MEET TH STATED STANq�N� L7�j00RDINATES ARE / I� r 1 i/ j' y / ;' / i' ;' '' , ' .i' `'�//�%� v o
B ED ON N 3 011' D AL ELEVATIONS �V* 4 • / I I �i / ,� ;!' / �� ,' i ;'/ �./` i' /' �/,'' / °� 5. NO UNDERGROUND UTILITIES HAVE BEEN LOCATED OR MAPPED FOR THIS PROJECT. THE LOCATION of ANY AND ALL UTILITIES SITE Q 41
�'•• pT S'!1? r I , , / / , , I% /' /' i ;' ; % j' / ° SHOWN HEREON WHETHER PUBLIC OR PRIVATE, IS BASED ON PHOTOGRAMMETRIC MAPPING AND IS APPROXIMATE ONLY. IT IS THE
m`2' ; i //' / i j / /'�•'�',_,a=---L- i--� 1-- L-,�:_�! (,% r;/ /` r / , �� CONTRACTOR'S RESPONSIBILITY TO VERIFY LOCATION PRIOR TO COMMENCEMENT OF ANY CONSTRUCTION. WSP CANNOT ASSUME LL
S s� • I I ( I / / ;' /' �.••��` �,j i / / !'--�___/ j j I ° RESPONSIBILITY FOR MISIDENTIFICATION OR OMISSION OF UNDERGROUND UTILITIES.
Uj
DAVI K. BRUBAKER, P.L.S. # 2968 I-p296� e , , , , / ,'' /� x ,' , ■ ui
• �,� pp�m , ( /! / I I / , / : / //; ;' /` ,•' / ;' /• mac' ,/ % �` % ; ���% /' %' ' /•' I 6. DASHED CONTOURS AND ESTIMATED SPOT ELEVATIONS SHOWN IN OBSCURED AREAS ARE COMPILED FROM LIMITED PHOTOGRAMMETIC DATA m
/`� ' DUE TO LEAF ON CONDITIONS DURING THE APRIL 17TH FLIGHT. INFORMATION SHOWN IN OBSCURED AREAS IS FOR REFERENCE ONLY. �j- 0.
3; 6
® URA / / /' `� %' / \ / / G
---�----- S9� @@0---7—j- , y—, '`T—/_ �--�i—�"--t---�-'`- �`-/ \ T40G.-- ✓ T-- - 7. NO CONTOURS ARE SHOWN UNDER WATER.
DATE '`3d . ` . R t \\\
'•
8. FLOOD LINES SHOWN HEREON ARE FOR REFERENCE ONLY, PER WWW.FRIS.NC.GOV.
1/ / / �� /:/ / j! / CATAWBA RIVER MOUNTAIN / j'' ,'' ,''� % .•r j !'!- % / / 9. PORTIONS OF THE MAPPED AREA ARE WITHIN A FLOOD HAZARD AREA ACCORDING TO FLOOD INSURANCE RATE MAPS:
-t' i /` !r / % ' '' ISLAND LAKE i j' i ' \ ' ,
i' Y i� % .4 A71n4�ncnns< PANFI dSn9 1 ACT RFVISFn ns/ng/no
V 1 / 12. THE AREA SHOWN HEREON WAS COMPUTED USING THE COORDINATE COMPUTATION METHOD.
13. LINES NOT SURVEYED ARE SHOWN AS BROKEN LINES FROM INFORMATION REFERENCED ON THE FACE OF THIS PL.
i % \
\/ ( IE j /:' r.•/�% ;'' /•! :,�! �' x 645.1 14. PROPERTY SUBJECT TO ALL EASEMENTS AND RESTRICTIONS OF RECORD.
/if'' ' ! / // ' / —_—_—_—_—_—_ ' \ �'—� - 15. INFORMATION SHOWN ON PRIVATE PROPERTY IS FOR REFERENCE ONLY.
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NAD83(2011)/NAVD88 STATE PLANE COORDINATES (SPC) FOR THIS PROJEC'
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POSITIONAL ACCURACY: 0 02'
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) TYPE OF GPS FIELD PROCEDUR
E: VRS
1\7, DATE OF SURVEY: APRIL 9, 2014 & APRIL 17, 2014
DATUM/EPOCH: NAD83(11)/ 2010.00
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CATAWBA RIVER \ i \ t ( \ I I I 'T _r 6 591,558.38 1,418,033.20 731.29
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CATAWBA RIVE \ % 10 594,347.95 1,414,228.66 728.77 REBAR
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