NC0004961_Appx D - Receptor Surveys_20171031

2017 Comprehensive Site Assessment Update October 2017
Riverbend Steam Station SynTerra
F.ATOMM93TV DI
RECEPTOR SURVEYS
Updated Receptor Survey Report - HDR CSA 2015
Drinking Water Supply Well and Receptor Survey -
August 5, 2016 (HDR)
Dewberry Report - Permanent Water Supply
Proposal to DEQ

2017 Comprehensive Site Assessment Update October 2017
Riverbend Steam Station
SynTerra
UPDATED RECEPTOR SURVEY REPORT - HDR
CSA 2015

Updated Receptor Survey Report
Riverbend Steam Station Ash Basin
NCDENR Records Review
On July 8, 2015, Mr. Justin Schumacher with HDR emailed a data request to Mr. Sean McGuire,
Geographic Information System (GIS) Specialist with the NCDENR Department of
Environmental Health (DEH) Public Water Supply Section (PWSS). Mr. McGuire provided an
updated Public Water Supply Water Sources GIS point data set with information from July 2014
to June 2015. The most current GIS data set of public water supply locations available from
North Carolina state agencies was provided by Mr. McGuire via electronic mail on July 20,
2015. The GIS point data for the public water supply wells includes, but is not limited to,
information such as public water supply (PWS) system identification numbers, ownership
information, PWS source type, well depth, and well yield. HDR reviewed the 2015 GIS data set
with 2014 GIS data set to identify additional public water supply sources within a 0.5-mile radius
of the RBSS ash basin compliance boundary since the last update.
On July 8, 2015, HDR reviewed the NCDENR Division of Water Resources (DWR) Source
Water Assessment Program (SWAP) online database for public water supply sources to identify
any wells located within a 0.5-mile radius of the ash basin compliance boundary, confirm the
location of wells included in the Public Water Supply Water Sources GIS point data set, and
identify any wellhead protection areas located within a 0.5-mile radius of the compliance
boundary. The NCDENR SWAP database provides detailed assessments of all public drinking
water intakes and wellhead protection areas in North Carolina. The website address is:
http://swap.ncwater.org/website/swap/viewer.htm.
No public water supply wells were identified in the Public Water Supply Water Sources GIS
point data set or on the NCDENR SWAP online database within a 0.5-mile radius of the RBSS
ash basin compliance boundary.
No wellhead protection areas were identified on the NCDENR SWAP online database within a
0.5-mile radius of the RBSS ash basin compliance boundary.
Mecklenburg County Records Review
On July 8, 2015, HDR reviewed Mecklenburg County's Groundwater and Wastewater Services
Well Information System online database to identify any private or public water supply wells
located in Mecklenburg County within a 0.5-mile radius of the ash basin compliance boundary.
Established in 2002, the database provides Mecklenburg County's collection of data about well
and septic system permitting, subsurface investigation permitting, monitoring well registration
and abandonment, and Mecklenburg County Priority List contamination sites. The website
address is: http://meckmap.mecklenburgcountync.gov/WIS 3/index.html.

No private or public water supply wells were identified on the Mecklenburg County Groundwater
and Wastewater Services Well Information System online database located within a 0.5-mile
radius of the ash basin compliance boundary.
Gaston County Records Review
HDR contacted the Gaston County Environmental Health Department to inquire about the
location and details (if available) for registered water supply wells located in Gaston County
within a 0.5-mile radius of the ash basin compliance boundary. On July 13, 2015, Mr. Justin
Schumacher with HDR contacted Ms. Samantha Dye, Assistant Administrator with the Gaston
County Environmental Health Department. Ms. Dye informed Mr. Schumacher that she
researched Gaston County's records which date back to 1989 for private and/or public water
supply wells within a 0.5-mile radius of the ash basin compliance boundary.
The Gaston County Environmental Health Department has no records of private or public water
supply wells located within a 0.5-mile radius of the ash basin compliance boundary.
Utility Department Records Review
HDR contacted Charlotte -Mecklenburg Utilities Department (CMUD) to inquire about municipal
water supply to properties located in Mecklenburg County within a 0.5-mile radius of the ash
basin compliance boundary. Prior to contacting CMUD, HDR personnel reviewed
orthophotography obtained from NC OneMap GeoSpatial portal (dated 2010) and identified one
residential property located in Mecklenburg County within a 0.5-mile radius of the ash basin
compliance boundary northeast of RBSS. On July 9, 2015, Mr. Justin Schumacher contacted
Mecklenburg County "Citizen Service/311" to inquire about municipal water supply to the
identified residence. CMUD does not have record of the residential property being connected to
the municipal water and sewer system.
HDR contacted the Mount Holly water plant to inquire about municipal water supply to
properties located in Mount Holly and Gaston County within a 0.5-mile radius of the ash basin
compliance boundary. On July 9, 2015, Mr. Schumacher received confirmation that Mount Holly
provides municipal water service to the RBSS site and the properties located in Gaston County
within a 0.5-mile radius of the ash basin compliance boundary.
Additional Survey Activities
Mr. Bob Drum with Duke Energy sent Mr. Scott Spinner with HDR an electronic mail
correspondence on July 10, 2015 indicating that the two private water supply wells and one
public water supply well previously identified on the RBSS site had been abandoned in June
2015.
Water Supply Well Survey Questionnaires
During the week of October 8, 2014, HDR mailed water supply well survey questionnaires to
property owners within a 0.5-mile radius of the RBSS ash basin compliance boundary

requesting information on the presence of water supply wells and well usage for the properties.
The mailing list was compiled from a query of the parcel addresses included in the Gaston and
Mecklenburg Counties' GIS databases utilizing the 0.5-mile offset. For each parcel identified, a
letter was mailed to the property owner stating the purpose of the request for information, a
questionnaire, and self-addressed stamped envelope. The letter requested the property owner
provide a timely response to the questionnaire. For property owners associated with multiple
parcels, a questionnaire was mailed for each parcel. A total of 328 surveys were mailed to
property owners. Responses to the questionnaires received through October 31, 2014 were
included in the November 2014 supplement to the September 2014 receptor survey.
Eleven questionnaire responses were received by HDR between October 31, 2014 and the
issuance of this report. Two of the returned questionnaires identified private water supply wells.
The properties containing the water supply were determined to be located further than 0.5-miles
from the RBSS ash basin compliance boundary.
USGS Hydrography Review
HDR reviewed the USGS National Hydrography Dataset (NHD) obtained from the USGS
National Map Viewer (http://viewer.nationalmal).gov/viewer/) to identify any surface waters
features within a 0.5-mile radius of the ash basin compliance boundary.
0

2017 Comprehensive Site Assessment Update October 2017
Riverbend Steam Station SynTerra
DRINKING WATER SUPPLY WELL AND RECEPTOR
SURVEY -AUGUST 5,r 2016 (HDR)

RIVERBEND STEAM STATION ASH BASIN
Drinking Water Supply Well
and Receptor Survey
NPDES Permit NC0004961
August 5, 2016

Duke Energy Carolinas, LLC i Riverbend Steam Station Ash Basin ���
Drinking Water Supply Well and Receptor Survey
REPORT VERIFICATION
Report Verification
PROJECT: DRINKING WATER SUPPLY WELL AND RECEPTOR SURVEY
RIVERBEND STEAM STATION ASH BASIN
NPDES PERMIT NC0004961
This document has been reviewed for accuracy and quality commensurate with the intended
application.
Prepared by:
Checked by:
Approved by:
Project Manager: Mark Filardi, PG
Date:
Date:
Date:

Duke Energy Carolinas, LLC I Riverbend Steam Station Ash Basin �1
Drinking Water Supply Well and Receptor Survey J
CONTENTS
Contents
Paqe
Report Verification
Contents..................................................................................................................................... ii
Section1 - Introduction.............................................................................................................. 1
Section2 - Background.............................................................................................................. 4
2.1 Plant and Ash Basin Description.................................................................................. 4
2.2 Description of Surrounding Properties.......................................................................... 4
Section 3 — Drinking Water Supply Well and Receptor Survey Activities and Findings ............... 5
3.1 NCDEQ Records Review............................................................................................. 5
3.2 Local/Regional Water Agency Records Review........................................................... 5
3.3 Mecklenburg County Records Review......................................................................... 6
3.4 Gaston County Records Review.................................................................................. 6
3.5 Utility Department Records Review.............................................................................. 7
3.6 HDR Field Survey........................................................................................................ 7
3.7 USGS Hydrography Review......................................................................................... 8
Section 4 - Summary of Findings............................................................................................... 9
Figures
Figure 1 Site Location Map
Figure 2 Drinking Water Supply Well and Receptor Survey Map
Table
Table 1 Water Supply Well Information
Appendices
Appendix A Summary of Agency Records
Appendix B EDR GeoCheck Report

Duke Energy Carolinas, LLC I Riverbend Steam Station Ash Basin �♦�
Drinking Water Supply Well and Receptor Survey J
SECTION 1 - INTRODUCTION
Section 1 - Introduction
Duke Energy Carolinas, LLC (Duke Energy), owns and formerly operated the Riverbend Steam
Station (RBSS), located near Mt. Holly, in Gaston County, North Carolina (see Figure 1).
RBSS began operation as a coal-fired generating station in 1929 and was subsequently retired
in April 2013. Following initial station operation, coal ash residue from RBSS's coal combustion
process was deposited in a cinder storage area and other areas near the cinder storage area
and coal pile on site. Following installation of precipitators and a wet sluicing system, coal ash
residue was disposed of in the station's ash basin system located adjacent to the station and
Mountain Island Lake. Discharge from the ash basin is permitted by the North Carolina
Department of Environmental Quality (NCDEQ)' Division of Water Resources (DWR) under the
National Pollutant Discharge Elimination System (NPDES) Permit NC0004961.
The Coal Ash Management Act 2014 — General Assembly of North Carolina Senate Bill 729
Ratified Bill (Session 2013) (SB 729) revised North Carolina General Statute 130A-309.209(c)
to require:
No later than October 1, 2014, the owner of a coal residuals surface
impoundment shall conduct a Drinking Water Supply Well Survey that identifies
all drinking water supply wells within one-half mile down -gradient from the
established compliance boundary of the impoundment and submit the Survey to
the Department.
On August 13, 2014, Duke Energy received a Notice of Regulatory Requirements (NORR) for
the 14 Coal Ash Facilities owned by Duke Energy in North Carolina. The NORR states:
No later than October 14th, 2014 as authorized pursuant to 15A NCAC 02L
.0106(g), the DWR is requesting that Duke perform a receptor survey at each of
the subject facilities and submit it to the DWR. The receptor survey is required
by 15A NCAC 02L .0106(g) and shall include identification of all receptors within
a radius of 2,640 feet (one-half mile) from the established compliance boundary
identified in the respective National Pollutant Discharge Elimination System
(NPDES) permits. Receptors shall include, but shall not be limited to, public and
private water supply wells (including irrigation wells and unused or abandoned
wells) and surface water features within one-half mile of the facility compliance
boundary. For those facilities for which Duke has already submitted a receptor
survey, please update your submittals to ensure they meet the requirements
stated in this letter and referenced attachments and submit them with the others.
If they do not meet these requirements, you must modify and resubmit the plans.
The results of the receptor survey shall be presented on a sufficiently scaled
map. The map shall show the coal ash facility location, the facility property
boundary, the waste and compliance boundaries, and all monitoring wells listed
Prior to September 18, 2015, the NCDEQ was referred to as the North Carolina Department of
Environment and Natural Resources (NCDENR). Both naming conventions are used in this report as
appropriate.

Duke Energy Carolinas, LLC I Riverbend Steam Station Ash Basin �♦�
Drinking Water Supply Well and Receptor Survey J
SECTION 1 - INTRODUCTION
in the respective NPDES permits. Any identified water supply wells shall be
located on the map and shall have the well owner's name and location address
listed on a separate table that can be matched to its location on the map.
HDR completed a Drinking Water Supply Well and Receptor Survey, dated September 30, 2014
to satisfy the requirements outlined in SB 729 and the NORR.
On July 14, 2016, the North Carolina General Assembly ratified House Bill 630/Session Law
2016-95 (HB630) that in part, "requires a coal combustion residuals impoundment owner to
provide permanent alternative water supplies for residents in areas surrounding coal
combustion residuals surface impoundments." Further, § 130A-309.21 1 (cl) establishes that:
As soon as practicable, but no later than October 15, 2018, the owner of a coal
combustion residuals surface impoundment shall establish permanent
replacement water supplies for (i) each household that has a drinking water
supply well located within a one-half mile radius from the established compliance
boundary of a coal combustion residuals impoundment, and is not separated
from the impoundment by the mainstem of a river, as that term is defined under
G. S.143-215.22G, or other body of water that would prevent the migration of
contaminants through groundwater from the impoundment to a well and (ii) each
household that has a drinking water supply well that is located in an area in
which contamination resulting from constituents associated with the presence of
a coal combustion residuals impoundment is expected to migrate, as
demonstrated by groundwater modeling and hydrogeologic, geologic, and
geotechnical investigations of the site, conducted in accordance with the
requirements of G. S. 130A-309.214(a) (4), and the results of other modeling or
investigations that may have been submitted pursuant to
G. S. 130A -309.213(b) (4).
To satisfy these requirements, HDR has completed this updated Drinking Water Supply Well
and Receptor Survey (Survey). The scope of this Survey includes identification of receptors
within a 0.5-mile radius (2,640 feet) of the RBSS ash basin compliance boundary.
Survey activities included contacting individual agencies and reviewing original records to
identify public and private water supply sources, confirming the location of wells, and identifying
any wellhead protection areas located within a 0.5-mile radius of the RBSS ash basin
compliance boundary. The following resources were consulted during completion of this Survey:
• NCDEQ DWR Public Water Supply Section's (PWSS) most current Public Water Supply
Water Sources GIS point data set;
• NCDEQ DWR Source Water Assessment Program (SWAP) online database for public
water supply sources;
• Environmental Data Resources (EDR) local/regional water agency records review;
• Gaston County, Health and Human Services Department, Environmental Health
Services;
• Mount Holly Public Utilities; and

Duke Energy Carolinas, LLC I Riverbend Steam Station Ash Basin
Drinking Water Supply Well and Receptor Survey J
SECTION 1 - INTRODUCTION
• USGS National Hydrography Dataset.
The updated survey activities performed and the findings of those activities are presented in
Section 3. Receptor locations are shown on Figure 2. Water supply well owner information,
including a well identifier that corresponds to Figure 2, the well owner's name, and well location
address are presented in Table 1.
1 40 0,

Duke Energy Carolinas, LLC I Riverbend Steam Station Ash Basin �1
Drinking Water Supply Well and Receptor Survey J
SECTION 2 - BACKGROUND
Section 2 - Background
2.1 Plant and Ash Basin Description
RBSS is a former coal-fired electricity generating facility which had a capacity of 454 megawatts
located in Gaston County, North Carolina, near the town of Mt. Holly. As of April 1, 2013, all of
the coal-fired units have been retired. The site is located between the south bank of the
Catawba River on Mountain Island Lake and the north side of Horseshoe Bend Beach Road.
The surrounding area generally consists of residential properties, undeveloped land, and
Mountain Island Lake. Horseshoe Bend Beach Road runs generally west to east and is located
along a local topographic divide. The topography at the site generally slopes downward from
that divide to Mountain Island Lake.
The seven -unit station began commercial operation in 1929 with two units and then expanded to
seven by 1954. During its final years of operation, RBSS was considered a cycling station and
was brought online to supplement energy supply when electricity demand was at its highest.
The ash basin system consists of a Primary Cell and a Secondary Cell, separated by an
intermediate dike. The ash basin at RBSS originally consisted of a single -cell basin
commissioned in 1957 and was expanded in 1979. The single basin was divided by constructing
a divider dike to form two separate cells in 1986.
The ash basin is located approximately 2,400 feet to the northeast of the power plant, adjacent
to Mountain Island Lake, as shown on Figure 2. The Primary Cell is impounded by an earthen
embankment dike, referred to as Dam #1 (Primary), located on the west side of the Primary
Cell. The Secondary Cell is impounded by an earthen embankment dike, referred to as Dam #2
(Secondary), located along the northeast side of the Secondary Cell. The compliance boundary
for groundwater quality in relation to the ash basin is defined in accordance with 15A NCAC 02L
.0107(a) as existing either 500 feet from the waste boundary or at the property boundary,
whichever is closer to the source.
2.2 Description of Surrounding Properties
Properties located within a 0.5-mile radius of the RBSS ash basin compliance boundary and
north of Mountain Island Lake are located in Huntersville, Mecklenburg County, North Carolina.
These properties are primarily comprised of a wildlife refuge and a nature preserve. One
residential property is located northeast of the RBSS ash basin compliance boundary within the
0.5-mile radius.
Properties located within the 0.5-mile radius of the RBSS ash basin compliance boundary and
south of Mountain Island Lake are located in Mount Holly, Gaston County, North Carolina. The
majority of the property in this area is owned by Duke Energy and associated with the RBSS.
Residential properties are located south and southeast of the ash basin compliance boundary to
the south of Horseshoe Bend Beach Road within the 0.5-mile radius. Properties surrounding the
RBSS site are shown on Figure 2.

Duke Energy Carolinas, LLC I Riverbend Steam Station Ash Basin �1J�
Drinking Water Supply Well and Receptor Survey
SECTION 3 — DRINKING WATER SUPPLY WELL AND RECEPTOR SURVEY ACTIVITIES AND FINDINGS
Section 3 — Drinking Water Supply Well and
Receptor Survey Activities and Findings
3.1 NCDEQ Records Review
On July 27, 2016, Ms. Molly Murchison with HDR contacted Mr. Sean McGuire, Geographic
Information Systems (GIS) Specialist with the NCDEQ Department of Environmental Health
(DEH) Public Water Supply Section (PWSS), by telephone. Mr. McGuire stated that the Public
Water Supply Water Sources GIS point data set was in the process of being updated. The most
current GIS data set of public water supply locations available from North Carolina state
agencies was updated in July 2015 and downloaded from the NC OneMap GeoSpatial Portal
(http://data.nconemap.com/geoportal/catalog/main/home.page) on August 1, 2016. The GIS
point data set for the public water supply wells includes, but is not limited to, public water supply
(PWS) system identification numbers, ownership information, PWS source type, well depth, and
well yield. HDR reviewed the GIS data set to identify public water supply sources within a 0.5-
mile radius of the RBSS ash basin compliance boundary.
On August 4, 2016, HDR reviewed the NCDEQ DWR Source Water Assessment Program
(SWAP) online database for public water supply sources to identify any wells located within a
0.5-mile radius of the RBSS ash basin compliance boundary, confirm the location of wells
included in the Public Water Supply Water Sources GIS point data set, and identify any
wellhead protection areas located within a 0.5-mile radius of the compliance boundary. The
NCDEQ SWAP database provides detailed assessments of all public drinking water intakes and
wellhead protection areas in North Carolina. The website address is:
(http://swap.ncwater.org/website/swap/viewer.htm).
No public water supply wells were identified in the Public Water Supply Water Sources GIS
point data set or on the NCDEQ SWAP online database within a 0.5-mile radius of the RBSS
ash basin compliance boundary.
No wellhead protection areas were identified on the NCDEQ SWAP online database within a
0.5-mile radius of the RBSS ash basin compliance boundary.
3.2 Local/Regional Water Agency Records Review
HDR contacted EDR to conduct a local/regional water agency records review for water supply
wells within a 1-mile radius of the RBSS site. A copy of the EDR Geocheck Report (Inquiry
Number 4686108.1s) dated July 28, 2016, is provided in Appendix B.
The EDR report identified two wells within the 0.5-mile radius of the RBSS ash basin
compliance boundary that are listed on the Federal United States Geological Survey (USGS)
database. Based on the latitude and longitude provided for the two wells in the database, they
were determined to be located on the RBSS property. Duke Energy personnel indicated these
water supply wells were never present onsite.

Duke Energy Carolinas, LLC I Riverbend Steam Station Ash Basin �1J�
Drinking Water Supply Well and Receptor Survey
SECTION 3 — DRINKING WATER SUPPLY WELL AND RECEPTOR SURVEY ACTIVITIES AND FINDINGS
The EDR report additionally identified one well within the 0.5-mile radius of the RBSS ash basin
compliance boundary as being listed on the Federal Data Reporting System (FRDS) Public
Water Supply System database. Public Water Supply well PWS: NC01367706 was confirmed
by Duke Energy personnel to be located on the RBSS property. Duke Energy personnel stated
that the latitude and longitude coordinates provided in the database for this well were not
accurate. The location of the well included on Figure 2 is based on a previous discussion with
Donna Burrell with Duke Energy regarding the location of this well. According to Duke Energy
personnel, this well is no longer used as a drinking water supply well for the station as it was
prior to March 2001 when the station was reportedly connected to the Mount Holly Public
Utilities Department. Available information pertaining to this well is included on Table 1.
The following sections document individual cases of correspondence between HDR staff and
utility companies or county departments to confirm the existence or addition of new wells within
a 0.5-mile radius of the ash basin compliance boundaries. Data was requested for private wells,
public wells, and municipal water supply sources. Owing to the narrow window of time for utility
companies and county departments to respond to HDR's request for data, some responses
were not received prior to report submission.
3.3 Mecklenburg County Records Review
On August 5, 2016, HDR reviewed Mecklenburg County's Groundwater and Wastewater
Services Well Information System online database to identify any private or public water supply
wells located in Mecklenburg County within a 0.5-mile radius of the ash basin compliance
boundary. Established in 2002, the database provides Mecklenburg County's collection of data
about well and septic system permitting, subsurface investigation permitting, monitoring well
registration and abandonment, and Mecklenburg County Priority List contamination sites. The
website address is: http://meckmap.mecklenburgcountync.gov/WIS 3/index.html.
No private or public water supply wells were identified on the Mecklenburg County Groundwater
and Wastewater Services Well Information System online database located within a 0.5-mile
radius of the ash basin compliance boundary.
3.4 Gaston County Records Review
On August 1, 2016, Ms. Molly Murchison with HDR contacted Ms. Samantha Dye of the Gaston
County Environmental Health Department to inquire about the location and details (if available)
for registered water supply wells located in Gaston County within a 0.5-mile radius of the ash
basin compliance boundary. As of the date of this report, Ms. Dye was reviewing current
database records and HDR was awaiting response.
In 2014, HDR contacted Ms. Dye and was informed that she researched Gaston County's
records, which date back to 1989, for private and/or public water supply wells within a 0.5-mile
radius of the RBSS ash basin compliance boundary. Results of the research indicated that the
Gaston County Environmental Health Department had no records of private or public water
supply wells located within a 0.5-mile radius of the RBSS ash basin compliance boundary.

Duke Energy Carolinas, LLC I Riverbend Steam Station Ash Basin �1J�
Drinking Water Supply Well and Receptor Survey
SECTION 3 - DRINKING WATER SUPPLY WELL AND RECEPTOR SURVEY ACTIVITIES AND FINDINGS
3.5 Utility Department Records Review
On August 2, 2016, Ms. Molly Murchison spoke with Ms. Juliana Perez with the Mount Holly
Public Utilities Department billing department. Ms. Perez confirmed that the Mount Holly Public
Utilities Department provides municipal water service to the RBSS site and the properties
located in Gaston County within a 0.5-mile radius of the RBSS ash basin compliance boundary.
On August 5, 2016, Mr. Sean Quarry with HDR spoke with Ms. Page of the Charlotte -
Mecklenburg Utilities Department (CMUD) to inquire about municipal water supply to properties
located in Mecklenburg County within a 0.5-mile radius of the RBSS ash basin compliance
boundary. Mr. Quarry provided tax parcel information obtained from Mecklenburg County's
online Property Ownership and Land Records Information System (POLARIS) for properties
located in Mecklenburg County within a 0.5-mile radius of the RBSS ash basin compliance
boundary. CMUD conveyed that it does not provide water service to the properties located in
Mecklenburg County within a 0.5-mile radius of the RBSS ash basin compliance boundary.
3.6 HDR Field Survey
HDR personnel performed a field reconnaissance on August 1, 2016, to identify public and
private water supply wells (including irrigation wells and unused or abandoned wells) and
surface water features located within a 0.5-mile radius of the RBSS ash basin compliance
boundary. A windshield survey was conducted from public roadways to identify water meters,
fire hydrants, water valves, and well heads/well houses. Prior to conducting the field
reconnaissance, HDR personnel reviewed orthophotography obtained from NC OneMap
GeoSpatial portal (dated 2010) to identify potential well heads/well houses and surface waters
within a 0.5-mile radius of the RBSS ash basin compliance boundary.
In addition, HDR personnel contacted Duke Energy site personnel to identify water supply wells
located on Duke Energy property.
HDR field personnel identified one private water supply well located within a 0.5-mile radius of
the RBSS ash basin compliance boundary during the field reconnaissance. This well is located
across Mountain Island Lake in Mecklenburg County (Well 3).
Duke Energy personnel familiar with water supply wells at RBSS reported that three wells are
present on Duke Energy's property. These wells (PWS: NC01367706, Well 1, and Well 2) are
identified on Table 1 with available property and well information. Duke Energy personnel
indicated that these three wells are not used for drinking water supply. Duke Energy personnel
reported that the wells are not currently in use and may have been abandoned. Well 1, located
near the Lark Maintenance Area, has reportedly never been used for a drinking water supply
and may be used for irrigation purposes only. The use of Well 2 is reportedly unknown, but it
may have been used as a drinking water source in the past.
Water meters, fire hydrants, and valve markings were identified at properties with structures
located in Gaston County within a 0.5-mile radius of the RBSS ash basin compliance boundary.

Duke Energy Carolinas, LLC I Riverbend Steam Station Ash Basin �1�
Drinking Water Supply Well and Receptor Survey J
SECTION 3 - DRINKING WATER SUPPLY WELL AND RECEPTOR SURVEY ACTIVITIES AND FINDINGS
Water meters, fire hydrants, and valve markings were not identified at properties with structures
located in Mecklenburg County within a 0.5-mile radius of the RBSS ash basin compliance
boundary..
USGS Hydrography Review
HDR reviewed the USGS National Hydrography Dataset (NHD) obtained from the USGS
National Map Viewer (http://viewer.nationalmap.gov/viewer/) to identify any surface waters
features within a 0.5-mile radius of the ash basin compliance boundary. Hydrography data
obtained from the USGS NHD is included on Figure 2.

Duke Energy Carolinas, LLC I Riverbend Steam Station Ash Basin �1J�
Drinking Water Supply Well and Receptor Survey
SECTION 4 - SUMMARY OF FINDINGS
Section 4 - Summary of Findings
A summary of the receptor Survey findings is provided below. Water supply wells (including
irrigation wells and unused or abandoned wells) are shown on Figure 2. Available property and
well information for the wells is provided in Table 1.
• A total of 4 water supply wells were identified within 0.5-mile of the RBSS ash basin
compliance boundary during the current receptor survey.
o One private water supply well is assumed to provide water to the residence
located to the northeast of RBSS within a 0.5-mile radius of the ash basin
compliance boundary. This well is located across Mountain Island Lake in
Mecklenburg County (Well 3).
o Two private water supply wells were reported on -site at RBSS. The wells are
reportedly not currently used for drinking water supply. One of the wells has
reportedly never been used for drinking water supply and was used for irrigation
purposes only. Duke Energy personnel report that the wells may be abandoned
but are not currently in use (Well 1 and Well 2).
o One public water supply well (PWS: NCO136706) was reported at the RBSS site.
Duke Energy personnel report that the well may be abandoned but are not
currently in use.
• No wellhead protection areas were identified within a 0.5-mile radius of the ash basin
compliance boundary.
• Several surface water features that flow toward Mountain Island Lake were identified
within a 0.5-mile radius of the ash basin.

Figures

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�- ASH BASIN ; ,S
I I
Powerplant 7 f ! f=
s V �,.V11at r Tat►4�
Du
RIVERBEND STEAM STATION�}.�"
R
NOTES:
I. SOURCES: USGS TOPOGRAPHIC MAP - MT. ISLAND LAKE, j
CREATED 1993. USGS TOPOGRAPHIC MAP - LAKE NORMAN
SOUTH, CREATED 1993. ev
SCALE (FEET) \ /
1000 o 1000 z000
lat)
SITE LOCATION MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION ASH BASIN
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2016
FIGURE

NOTES:
1. ASH BASIN WASTE BOUNDARY AND ASH STORAGE AREAS ARE APPROXIMATE
2. PRIVATE WELL LOCATIONS ARE APPROXIMATE
3. ORTHOPHOTOGRAPHY IS FROM NC ONEMAP (2010) and WSP (2014)
4. THE COMPLIANCE BOUNDARY IS ESTABLISHED ACCORIDING TO THE DEFINITION FOUND IN 15A NCAC 02L .0107 (a)
5. DUKE ENERGY PROPERTY BOUNDARY WAS SUPPLIED BY DUKE ENERGY REAL ESTATE
6. WATER SUPPLY WELL SURVEY PERFORMED 08/2016
7. PROPERTY INFORMATION PERTAINING TO IDENTIFIED WATER SUPPLY WELLS IS INCLUDED IN TABLE 1
F)l
500 1,000 1,500
Feet
WATER SUPPLY WELL SURVEY MAP
DUKE ENERGY CAROLINAS, LLC
RIVERBEND STEAM STATION
GASTON COUNTY, NORTH CAROLINA
DATE
AUGUST 2016
FIGURE

Tables

Table 1 - Summary of Water Supply Wells - Riverbend Steam Station
Approximate Distance
Well ID
Property Owner Property Address
parcel Number
Reported Well Use
from Ash Basin
Direction from
Well Depth
Well Casing
Well Yield
Well Eligiblity for Replacement Water
Category
(shown on Figure 2)
(well location)
Compliance Boundary
Ash Basin
(ft-bgs)
Depth (ft bgs)
(gpm)
Supply Per N.C.G.S. 130A-309.211(c)(1)
(ft)
pply
Wells
2
Duke Energy Carolinas, LLC 175 Steam Plant Road, Mount Holly, NC 28120
4519542126
Irrigation
1975
W
N/A
N/A
N/A
ABANDONED
ABANDONED PRIVATE WATER SUPPLY WELL
Gaston
3
Duke Energy Carolinas, LLC
175 Steam Plant Road, Mount Holly, NC 28120
4519200105
Unknown; possibly
1750
SW
N/A
N/A
N/A
ABANDONED
ABANDONED PRIVATE WATER SUPPLY WELL
Gaston
drinking
PWS: NCO1367706
Duke Energy Carolinas, LLC
175 Steam Plant Road, Mount Holly, NC 28120
4519200105
Unknown
625
SW
N/A
N/A
N/A
ABANDONED
ABANDONED PRIVATE WATER SUPPLY WELL
Gaston
1
Lewis Atkins Parks Heirs
4020 Neck Road, Huntersville, NC 28078
1318105
Drinking
2300
NE
N/A
N/A
N/A
REPORTED PRIVATE WATER SUPPLY WELL
(Mecklenburg)
1 of 1

Appendix A
Summary of Agency Records

Appendix A: Summary of Agency Records
Comments: Including response details, changes in well status since 2014 survey, new wells, abandonments,
Well Type
Source
Contact Name
Contact Phone
Date of Call
Date of Email
expanded areas of utility service
Public Water Supply
NCDEQ
Sean McGuire
919-707-9104
7/28/2016
7/28/2016
Database is currently being updated. The data from 2015 was accessed through NConeMap.
Water Supply Wells
EDR
Sean McLaughlin
800-238-1846
7/27/2016
7/27/2016
EDRs have been received for all sites.
Private Wells
Gaston County DHHS
Samantha Dye
704-853-5230
N/A
8/1/2016
Request for data sent, along with map showing 0.5 mile offset.
Public Utilities
Mount Holly Public Utilities Department
Ms. Juliana Perez
704-951-3007
8/2/2016
N/A
Confirmation that list of roads which are in Gaston county and 0.5 mile buffer are serviced by the utility
Charlotte -Mecklenburg Utilities Department
Cathy Page, New
Inquired whether roads in Mecklenburg county and in the 0.5 mile buffer have water lines through CharMeck water
Public Utilities
(CMUD)
Services
704-399-2221
8/5/2016
N/A
services. Response is no.
Riverbend Receptor Survey

Appendix B
EDR GeoCheck Report
Riverbend Steam Station
175 Steam Plant Road
Mounty Holly, NC 28120
Inquiry Number: 4686108.1s
July 28, 2016

Riverbend Steam Station
175 Steam Plant Road
Mount Holly, NC 28120
Inquiry Number: 4686108.1s
July 28, 2016
6 Armstrong Road, 4th floor
Shelton, CT 06484
(rEDR ° Toll Free: 800.352.0050
www.edrnet.com
FORM-NULL-SPM

TABLE OF CONTENTS
SECTION
GEOCHECK ADDENDUM
PAGE
Physical Setting Source Addendum
A-1
Physical Setting Source Summary --------------------------------------------
A-2
Physical Setting Source Map________________________________________________
A-7
Physical Setting Source Map Findings----------------------------------------
A-8
Physical Setting Source Records Searched ------------------------------------
PSGR-1
Thank you for your business.
Please contact EDR at 1-800-352-0050
with any questions or comments.
Disclaimer - Copyright and Trademark Notice
This Report contains certain information obtained from a variety of public and other sources reasonably available to Environmental Data
Resources, Inc. It cannot be concluded from this Report that coverage information for the target and surrounding properties does not exist from
other sources. NO WARRANTY EXPRESSED OR IMPLIED, IS MADE WHATSOEVER IN CONNECTION WITH THIS REPORT. ENVIRONMENTAL
DATA RESOURCES, INC. SPECIFICALLY DISCLAIMS THE MAKING OF ANY SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION,
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LIMITED TO A REFUND OF THE AMOUNT PAID FOR THIS REPORT. Purchaser accepts this Report "AS IS". Any analyses, estimates, ratings,
environmental risk levels or risk codes provided in this Report are provided for illustrative purposes only, and are not intended to provide, nor
should they be interpreted as providing any facts regarding, or prediction or forecast of, any environmental risk for any property. Only a Phase I
Environmental Site Assessment performed by an environmental professional can provide information regarding the environmental risk for any
property. Additionally, the information provided in this Report is not to be construed as legal advice.
Copyright 2016 by Environmental Data Resources, Inc. All rights reserved. Reproduction in any media or format, in whole
or in part, of any report or map of Environmental Data Resources, Inc., or its affiliates, is prohibited without prior written permission.
EDR and its logos (including Sanborn and Sanborn Map) are trademarks of Environmental Data Resources, Inc. or its affiliates. All other
trademarks used herein are the property of their respective owners.
TC4686108.1s Page 1

GEOCHECK9 - PHYSICAL SETTING SOURCE REPORT
TARGET PROPERTY ADDRESS
RIVERBEND STEAM STATION
175 STEAM PLANT ROAD
MOUNT HOLLY, NC 28120
TARGET PROPERTY COORDINATES
Latitude (North):
Longitude (West):
Universal Tranverse Mercator:
UTM X (Meters):
UTM Y (Meters):
Elevation:
USGS TOPOGRAPHIC MAP
Target Property Map:
Version Date:
North Map:
Version Date:
35.3665 - 35' 21' 59.40"
80.9625 - 80' 57' 45.00"
Zone 17
503406.7
3913489.8
685 ft. above sea level
35080-C8 MOUNTAIN ISLAND LAKE, NC
1997
35080-D8 LAKE NORMAN SOUTH, NC
1996
EDR's GeoCheck Physical Setting Source Addendum is provided to assist the environmental professional in
forming an opinion about the impact of potential contaminant migration.
Assessment of the impact of contaminant migration generally has two principal investigative components:
1. Groundwater flow direction, and
2. Groundwater flow velocity.
Groundwater flow direction may be impacted by surface topography, hydrology, hydrogeology, characteristics
of the soil, and nearby wells. Groundwater flow velocity is generally impacted by the nature of the
geologic strata.
TC4686108.1s Page 1

GEOCHECK®- PHYSICAL SETTING SOURCE SUMMARY
GROUNDWATER FLOW DIRECTION INFORMATION
Groundwater flow direction for a particular site is best determined by a qualified environmental professional
using site -specific well data. If such data is not reasonably ascertainable, it may be necessary to rely on other
sources of information, such as surface topographic information, hydrologic information, hydrogeologic data
collected on nearby properties, and regional groundwater flow information (from deep aquifers).
TOPOGRAPHIC INFORMATION
Surface topography may be indicative of the direction of surficial groundwater flow. This information can be used to
assist the environmental professional in forming an opinion about the impact of nearby contaminated properties or,
should contamination exist on the target property, what downgradient sites might be impacted.
TARGET PROPERTY TOPOGRAPHY
General Topographic Gradient: General North
SURROUNDING TOPOGRAPHY: ELEVATION PROFILES
O
A
V N
N
W
- -
A - .� -
- . - .
- . -
. - .
- . - . - -
- -�
�. �-
North
I
South
TIP
0
0
Of Oi
V
West I East
TIP
0 1/2 1 Miles
Target Property Elevation: 685 ft.
Source: Topography has been determined from the USGS 7.5' Digital Elevation Model and should be evaluated
on a relative (not an absolute) basis. Relative elevation information between sites of close proximity
should be field verified.
TC4686108.1s Page 2

GEOCHECK®- PHYSICAL SETTING SOURCE SUMMARY
HYDROLOGIC INFORMATION
Surface water can act as a hydrologic barrier to groundwater flow. Such hydrologic information can be used to assist
the environmental professional in forming an opinion about the impact of nearby contaminated properties or, should
contamination exist on the target property, what downgradient sites might be impacted.
Refer to the Physical Setting Source Map following this summary for hydrologic information (major waterways
and bodies of water).
FEMA FLOOD ZONE
Target Property County
GASTON,NC
Flood Plain Panel at Target Property:
Additional Panels in search area:
NATIONAL WETLAND INVENTORY
NWI Quad at Target Property
MOUNTAIN ISLAND LAKE
HYDROGEOLOGIC INFORMATION
FEMA Flood
Electronic Data
YES - refer to the Overview Map and Detail Map
37071C - FEMA DFIRM Flood data
37119C - FEMA DFIRM Flood data
NWI Electronic
Data Coverage
YES - refer to the Overview Map and Detail Map
Hydrogeologic information obtained by installation of wells on a specific site can often be an indicator
of groundwater flow direction in the immediate area. Such hydrogeologic information can be used to assist the
environmental professional in forming an opinion about the impact of nearby contaminated properties or, should
contamination exist on the target property, what downgradient sites might be impacted.
AQUIFLOW®
Search Radius: 1.000 Mile.
EDR has developed the AQUIFLOW Information System to provide data on the general direction of groundwater
flow at specific points. EDR has reviewed reports submitted by environmental professionals to regulatory
authorities at select sites and has extracted the date of the report, groundwater flow direction as determined
hydrogeologically, and the depth to water table.
LOCATION GENERAL DIRECTION
MAP ID FROM TP GROUNDWATER FLOW
Not Reported
TC4686108.1s Page 3

GEOCHECK®- PHYSICAL SETTING SOURCE SUMMARY
GROUNDWATER FLOW VELOCITY INFORMATION
Groundwater flow velocity information for a particular site is best determined by a qualified environmental professional
using site specific geologic and soil strata data. If such data are not reasonably ascertainable, it may be necessary
to rely on other sources of information, including geologic age identification, rock stratigraphic unit and soil
characteristics data collected on nearby properties and regional soil information. In general, contaminant plumes
move more quickly through sandy -gravelly types of soils than silty -clayey types of soils.
GEOLOGIC INFORMATION IN GENERAL AREA OF TARGET PROPERTY
Geologic information can be used by the environmental professional in forming an opinion about the relative speed
at which contaminant migration may be occurring.
:AZa :F� 1:L1111 0:L1011411 ki 1 I I
GEOLOGIC AGE IDENTIFICATION
Era: Paleozoic Category: Plutonic and Intrusive Rocks
System: Ordovian
Series: Lower Paleozoic granitic rocks
Code: Pzg 1 (decoded above as Era, System & Series)
Geologic Age and Rock Stratigraphic Unit Source: P.G. Schruben, R.E. Arndt and W.J. Bawiec, Geology
of the Conterminous U.S. at 1:2,500,000 Scale - a digital representation of the 1974 P.B. King and H.M. Beikman
Map, USGS Digital Data Series DDS - 11 (1994).
DOMINANT SOIL COMPOSITION IN GENERAL AREA OF TARGET PROPERTY
The U.S. Department of Agriculture's (USDA) Soil Conservation Service (SCS) leads the National Cooperative Soil
Survey (NCSS) and is responsible for collecting, storing, maintaining and distributing soil survey information
for privately owned lands in the United States. A soil map in a soil survey is a representation of soil patterns
in a landscape. Soil maps for STATSGO are compiled by generalizing more detailed (SSURGO) soil survey maps.
The following information is based on Soil Conservation Service STATSGO data.
Soil Component Name: CECIL
Soil Surface Texture: sandy clay loam
Hydrologic Group: Class B - Moderate infiltration rates. Deep and moderately deep,
moderately well and well drained soils with moderately coarse
textures.
Soil Drainage Class: Well drained. Soils have intermediate water holding capacity. Depth to
water table is more than 6 feet.
Hydric Status: Soil does not meet the requirements for a hydric soil.
Corrosion Potential - Uncoated Steel: HIGH
Depth to Bedrock Min: > 60 inches
Depth to Bedrock Max: > 60 inches
TC4686108.1s Page 4

GEOCHECK®- PHYSICAL SETTING SOURCE SUMMARY
Soil Layer Information
Boundary
Classification
Layer
Upper
Lower
Soil Texture Class
AASHTO Group
Unified Soil
Permeability
Soil Reaction
Rate (in/hr)
(pH)
1
0 inches
7 inches
sandy clay loam
Silt -Clay
COARSE -GRAINED
Max: 2.00
Max: 6.50
Materials (more
SOILS, Sands,
Min: 0.60
Min: 4.50
than 35 pct.
Sands with fines,
passing No.
Silty Sand.
200), Silty
Soils.
2
7 inches
11 inches
sandy clay loam
Silt -Clay
COARSE -GRAINED
Max: 2.00
Max: 5.50
Materials (more
SOILS, Sands,
Min: 0.60
Min: 4.50
than 35 pct.
Sands with fines,
passing No.
Silty Sand.
200), Silty
Soils.
3
11 inches
50 inches
clay
Silt -Clay
FINE-GRAINED
Max: 2.00
Max: 5.50
Materials (more
SOILS, Silts and
Min: 0.60
Min: 4.50
than 35 pct.
Clays (liquid
passing No.
limit 50% or
200), Clayey
more), Elastic
Soils.
silt.
4
50 inches
75 inches
variable
Not reported
Not reported
Max: 0.00
Max: 0.00
Min: 0.00
Min: 0.00
OTHER SOIL TYPES IN AREA
Based on Soil Conservation Service STATSGO data, the following additional subordinant soil types may
appear within the general area of target property.
Soil Surface Textures: sandy loam
loam
clay loam
silt loam
very channery - silt loam
gravelly - sandy loam
Surficial Soil Types: sandy loam
loam
clay loam
silt loam
very channery - silt loam
gravelly - sandy loam
Shallow Soil Types: sandy clay
silt loam
silty clay loam
clay
very channery - silt loam
loam
Deeper Soil Types: silty clay loam
weathered bedrock
fine sandy loam
unweathered bedrock
sandy clay loam
TC4686108.1s Page 5

GEOCHECK®- PHYSICAL SETTING SOURCE SUMMARY
LOCAL / REGIONAL WATER AGENCY RECORDS
EDR Local/Regional Water Agency records provide water well information to assist the environmental
professional in assessing sources that may impact ground water flow direction, and in forming an
opinion about the impact of contaminant migration on nearby drinking water wells.
WELL SEARCH DISTANCE INFORMATION
DATABASE SEARCH DISTANCE (miles)
Federal USGS 1.000
Federal FRDS PWS 1.000
State Database 1.000
FEDERAL USGS WELL INFORMATION
LOCATION
MAP ID WELL ID FROM TP
2 USGS40000886680 1/2 - 1 Mile SW
3 USGS40000886687 1/2 - 1 Mile WSW
FEDERAL FRDS PUBLIC WATER SUPPLY SYSTEM INFORMATION
LOCATION
MAP ID WELL ID FROM TP
1 NCO136706 1/4 - 1/2 Mile SSW
Note: PWS System location is not always the same as well location.
STATE DATABASE WELL INFORMATION
LOCATION
MAP ID WELL ID FROM TP
No Wells Found
TC4686108.1s Page 6

PHYSICAL SETTING SOURCE MAP - 4686108.1S
'1I . •� p► - - ��I 411i1
•�� � � ���, , j � � � III � � ���
INS
'
� �I
County Boundary
Major Roads
Contour Lines
OQ Earthquake epicenter, Richter 5 or greater
® Water Wells
© Public Water Supply Wells
Cluster of Multiple Icons
0 114 1/2 I Miles
Groundwater Flow Direction E2 Wildlife Areas
ffD Indeterminate Groundwater Flow at Location 0 Natural Areas
c v Groundwater Flow Varies at Location o Rare & Endangered Species
M10o-year flood zone
500-year flood zone
. National Wetland Inventory
SITE NAME: Riverbend Steam Station
CLIENT: HDR / LMS
ADDRESS: 175 Steam Plant Road
CONTACT: Molly Murchison
Mount Holly NC 28120
INQUIRY #: 4686108.1s
LAT/LONG: 35.3665 / 80.9625
DATE: July 28, 2016 10:45 am
Copyright cg 2016 EDR, Inc. cs, 2015 TomTom Rai. 2015.

GEOCHECK®- PHYSICAL SETTING SOURCE MAP FINDINGS
Map ID
Direction
Distance
Elevation
1
SSW
1/4 - 1/2 Mile
Higher
Epa region:
04
State:
Pwsid:
NCO136706
Pwsname:
DUKE POWER-RIVERBEND STEAM STA
City served:
Not Reported
State served:
Zip served:
Not Reported
Fips county:
Status:
Closed
Pop srvd:
Pwssvcconn:
2
Source:
Pws type:
NTNCWS
Owner:
Contact:
STEVE RUTLEDGE AND MANAGER NOW
Contactor gname:
Not Reported
Contact phone:
Not Reported
Contact address1
Contact address2:
175 STEAM PLANT RD
Contact city:
Contact state:
NC
Contact zip:
Activity code:
I
Database EDR ID Number
FRDS PWS NCO136706
NC
NC
37071
150
Groundwater
Private
Not Reported
MOUNT HOLLY
28120
Location Information:
Name:
DUKE POWER-RIVERBEND STEAM STA
Pwstypcd:
NTNCWS Primsrccd:
GW
Popserved:
150
Add1:
Not Reported
Add2:
175 STEAM PLANT RD
City:
MOUNT HOLLY State:
NC
Zip:
28120 Phone:
Not Reported
Cityserv:
MOUNT HOLLY Cntyserv:
Not Reported
Stateserv:
NC Zipserv:
Not Reported
PWS ID:
NCO136706
Date Initiated:
7706 Date Deactivated: Not Reported
PWS Name:
DUKE POWER-RIVERBEND STEAM STA
28120
Addressee / Facility:
System Owner/Responsible Party
L G DUCKWORTH MAST MECH
PO BOX 367 ATN W M CAVIN
MT HOLLY, NC 28120
Addressee / Facility:
System Owner/Responsible Party
DUKE POWER STEAM PROD DEPT
Facility Latitude:
3521 40 Facility Longitude:
080 58 00
City Served:
Not Reported
Treatment Class:
Treated Population:
00000026
Violations information not reported.
ENFORCEMENT INFORMATION:
System Name:
DUKE POWER-RIVERBEND STEAM
Violation Type:
Monitoring, Routine Major (TCR)
Contaminant:
COLIFORM (TCR)
Compliance Period:
1999-10-01 - 1999-12-31
Violation ID:
0003296
Enforcement Date:
2000-02-04 Enf. Action:
State Formal NOV Issued
TC4686108.1s Page 8

GEOCHECK®- PHYSICAL SETTING SOURCE MAP FINDINGS
ENFORCEMENT INFORMATION:
System Name:
DUKE POWER-RIVERBEND STEAM
Violation Type:
Monitoring, Routine Major (TCR)
Contaminant:
COLIFORM (TCR)
Compliance Period:
1999-10-01 - 1999-12-31
Violation ID:
0003296
Enforcement Date:
2000-02-04 Enf. Action: State Public Notif Requested
2
SW
FED USGS
1/2 - 1 Mile
Higher
Org.Identifier:
USGS-NC
Formal name:
USGS North Carolina Water Science Center
Monloc Identifier:
USGS-352131080583001
Monloc name:
GS-001
Monloc type:
Well
Monloc desc:
Not Reported
Huc code:
Not Reported
Drainagearea value:
Not Reported
Drainagearea Units:
Not Reported
Contrib drainagearea:
Not Reported
Contrib drainagearea units:
Not Reported
Latitude:
35.3587489
Longitude:
-80.9747968
Sourcemap scale:
Not Reported
Horiz Acc measure:
1
Horiz Acc measure units:
seconds
Horiz Collection method:
Interpolated from map
Horiz coord refsys:
NAD83
Vert measure val:
Not Reported
Vert measure units:
Not Reported
Vertacc measure val:
Not Reported
Vert accmeasure units:
Not Reported
Vertcollection method:
Not Reported
Vert coord refsys:
Not Reported
Countrycode:
US
Aquifername:
Piedmont and Blue Ridge crystalline -rock aquifers
Formation type:
Felsic Metaigneous Rock
Aquifer type:
Not Reported
Construction date:
Not Reported
Welldepth:
437.5
Welldepth units:
ft
Wellholedepth:
Not Reported
Wellholedepth units:
Not Reported
Ground -water levels, Number of Measurements: 0
3
WSW
FED USGS
1/2 - 1 Mile
Lower
Org.Identifier:
USGS-NC
Formal name:
USGS North Carolina Water Science Center
Monloc Identifier:
USGS-352133080583701
Monloc name:
GS-003
Monloc type:
Well
Monloc desc:
Not Reported
Huc code:
Not Reported
Drainagearea value:
Not Reported
Drainagearea Units:
Not Reported
Contrib drainagearea:
Not Reported
Contrib drainagearea units:
Not Reported
Latitude:
35.3593044
Longitude:
-80.9767413
Sourcemap scale:
Not Reported
USGS40000886680
USGS40000886687
TC4686108.1s Page 9

GEOCHECK®- PHYSICAL SETTING SOURCE MAP FINDINGS
Horiz Acc measure:
1
Horiz Acc measure units:
Horiz Collection method:
Interpolated from map
Horiz coord refsys:
NAD83
Vert measure val:
Vert measure units:
Not Reported
Vertacc measure val:
Vert accmeasure units:
Not Reported
Vertcollection method:
Not Reported
Vert coord refsys:
Not Reported
Countrycode:
Aquifername:
Piedmont and Blue Ridge crystalline -rock aquifers
Formation type:
Felsic Metaigneous Rock
Aquifer type:
Not Reported
Construction date:
Not Reported
Welldepth:
Welldepth units:
ft
Wellholedepth:
Wellholedepth units:
Not Reported
Ground -water levels, Number of Measurements: 0
seconds
Not Reported
Not Reported
Us
305
Not Reported
TC4686108.1 s Page 10

GEOCHECK®- PHYSICAL SETTING SOURCE MAP FINDINGS
RADON
AREA RADON INFORMATION
Federal EPA Radon Zone for GASTON County: 2
Note: Zone 1 indoor average level > 4 pCi/L.
Zone 2 indoor average level — 2 pCi/L and — 4 pCi/L.
Zone 3 indoor average level < 2 pCi/L.
Federal Area Radon Information for Zip Code:
28120
Number of sites tested: 8
Area
Average Activity
% <4 pCi/L
% 4-20 pCi/L
% >20 pCi/L
Living Area - 1 st Floor
0.150 pCi/L
100%
0%
0%
Living Area - 2nd Floor
Not Reported
Not Reported
Not Reported
Not Reported
Basement
Not Reported
Not Reported
Not Reported
Not Reported
TC4686108.1 s Pagel l

PHYSICAL SETTING SOURCE RECORDS SEARCHED
TOPOGRAPHIC INFORMATION
USGS 7.5' Digital Elevation Model (DEM)
Source: United States Geologic Survey
EDR acquired the USGS 7.5' Digital Elevation Model in 2002 and updated it in 2006. The 7.5 minute DEM corresponds
to the USGS 1:24,000- and 1:25,000-scale topographic quadrangle maps. The DEM provides elevation data
with consistent elevation units and projection.
HYDROLOGIC INFORMATION
Flood Zone Data: This data, available in select counties across the country, was obtained by EDR in 2003 & 2011 from the Federal
Emergency Management Agency (FEMA). Data depicts 100-year and 500-year flood zones as defined by FEMA.
NWI: National Wetlands Inventory. This data, available in select counties across the country, was obtained by EDR
in 2002, 2005 and 2010 from the U.S. Fish and Wildlife Service.
State Wetlands Data: Wetland Inventory
Source: US Fish & Wildlife Service
Telephone: [phone]
HYDROGEOLOGIC INFORMATION
AQUIFLOWR Information System
Source: EDR proprietary database of groundwater flow information
EDR has developed the AQUIFLOW Information System (AIS) to provide data on the general direction of groundwater
flow at specific points. EDR has reviewed reports submitted to regulatory authorities at select sites and has
extracted the date of the report, hydrogeologically determined groundwater flow direction and depth to water table
information.
GEOLOGIC INFORMATION
Geologic Age and Rock Stratigraphic Unit
Source: P.G. Schruben, R.E. Arndt and W.J. Bawiec, Geology of the Conterminous U.S. at 1:2,500,000 Scale - A digital
representation of the 1974 P.B. King and H.M. Beikman Map, USGS Digital Data Series DDS - 11 (1994).
STATSGO: State Soil Geographic Database
Source: Department of Agriculture, Natural Resources Conservation Service (NRCS)
The U.S. Department of Agriculture's (USDA) Natural Resources Conservation Service (NRCS) leads the national
Conservation Soil Survey (NCSS) and is responsible for collecting, storing, maintaining and distributing soil
survey information for privately owned lands in the United States. A soil map in a soil survey is a representation
of soil patterns in a landscape. Soil maps for STATSGO are compiled by generalizing more detailed (SSURGO)
soil survey maps.
SSURGO: Soil Survey Geographic Database
Source: Department of Agriculture, Natural Resources Conservation Service (NRCS)
Telephone: [phone]
SSURGO is the most detailed level of mapping done by the Natural Resources Conservation Service, mapping
scales generally range from 1:12,000 to 1:63,360. Field mapping methods using national standards are used to
construct the soil maps in the Soil Survey Geographic (SSURGO) database. SSURGO digitizing duplicates the
original soil survey maps. This level of mapping is designed for use by landowners, townships and county
natural resource planning and management.
TC4686108.1s Page PSGR-1

PHYSICAL SETTING SOURCE RECORDS SEARCHED
LOCAL / REGIONAL WATER AGENCY RECORDS
FEDERAL WATER WELLS
PWS: Public Water Systems
Source: EPA/Office of Drinking Water
Telephone: [phone]
Public Water System data from the Federal Reporting Data System. A PWS is any water system which provides water to at
least 25 people for at least 60 days annually. PWSs provide water from wells, rivers and other sources.
PWS ENF: Public Water Systems Violation and Enforcement Data
Source: EPA/Office of Drinking Water
Telephone: [phone]
Violation and Enforcement data for Public Water Systems from the Safe Drinking Water Information System (SDWIS) after
August 1995. Prior to August 1995, the data came from the Federal Reporting Data System (FRDS).
USGS Water Wells: USGS National Water Inventory System (NWIS)
This database contains descriptive information on sites where the USGS collects or has collected data on surface
water and/or groundwater. The groundwater data includes information on wells, springs, and other sources of groundwater.
STATE RECORDS
North Carolina Public Water Supply Wells
Source: Department of Environmental Health
Telephone: [phone]
OTHER STATE DATABASE INFORMATION
NC Natural Areas: Significant Natural Heritage Areas
Source: Center for Geographic Information and Analysis
Telephone: [phone]
A polygon converage identifying sites (terrestrial or aquatic that have particular biodiversity significance.
A site's significance may be due to the presenceof rare species, rare or hight quality natural communities, or
other important ecological features.
NC Game Lands: Wildlife Resources Commission Game Lands
Source: Center for Geographic Information and Analysis
Telephone: [phone]
All publicly owned game lands managed by the North Carolina Wildlife Resources Commission and as listed in Hunting
and Fishing Maps.
NC Natural Heritage Sites: Natural Heritage Element Occurrence Sites
Source: Center for Geographic Information and Analysis
Telephone: [phone]
A point coverage identifying locations of rare and endangered species, occurrences of exemplary or unique natural
ecosystems (terrestrial or aquatic), and special animal habitats (e.g., colonial waterbird nesting sites).
RADON
State Database: NC Radon
Source: Department of Environment & Natural Resources
Telephone: [phone]
Radon Statistical and Non Statiscal Data
Area Radon Information
Source: USGS
Telephone: [phone]
The National Radon Database has been developed by the U.S. Environmental Protection Agency
(USEPA) and is a compilation of the EPA/State Residential Radon Survey and the National Residential Radon Survey.
The study covers the years 1986 - 1992. Where necessary data has been supplemented by information collected at
private sources such as universities and research institutions.
TC4686108.1s Page PSGR-2

PHYSICAL SETTING SOURCE RECORDS SEARCHED
EPA Radon Zones
Source: EPA
Telephone: [phone]
Sections 307 & 309 of IRAA directed EPA to list and identify areas of U.S. with the potential for elevated indoor
radon levels.
OTHER
Airport Landing Facilities: Private and public use landing facilities
Source: Federal Aviation Administration, 800-457-6656
Epicenters: World earthquake epicenters, Richter 5 or greater
Source: Department of Commerce, National Oceanic and Atmospheric Administration
Earthquake Fault Lines: The fault lines displayed on EDR's Topographic map are digitized quaternary faultlines, prepared
in 1975 by the United State Geological Survey
STREET AND ADDRESS INFORMATION
© 2015 TomTom North America, Inc. All rights reserved. This material is proprietary and the subject of copyright protection
and other intellectual property rights owned by or licensed to Tele Atlas North America, Inc. The use of this material is subject
to the terms of a license agreement. You will be held liable for any unauthorized copying or disclosure of this material.
TC4686108.1s Page PSGR-3

2017 Comprehensive Site Assessment Update October 2017
Riverbend Steam Station
SynTerra
DEWBERRY REPORT - PERMANENT WATER
SUPPLY PROPOSAL TO DEQ

Permanent Water Supply Proposal to DEQ - Riverbend
Riverbend Steam Station
Gaston County
0 eligible households
Duke Energy has evaluated the feasibility and costs of providing a permanent replacement
water supply to eligible households, as required under G.S. 130A-309.21 1 (cl) of House Bill
630. Households were designated as "eligible" if any portion of a parcel of land crossed the
mile compliance buffer described in HB630 and if the household currently utilized well water or
bottled water (under Duke Energy's bottled water program) as the drinking water source.
Undeveloped parcels were identified but were not considered "eligible" because groundwater
wells are not currently utilized as a drinking source.
Dewberry, a respected outside vendor, conducted the Potable Water Programmatic Evaluation
(attached); the evaluation consisted of a survey of eligible households and a preliminary
engineering evaluation, cost estimate and schedule. Dewberry's evaluation did not discover
any homes within a'/2 mile of the compliance boundary currently utilizing groundwater as the
drinking water source.
DUKE
�, ENERGY

} _ Dewberry
Riverbend Station Phase II
Potable Water Programmatic
Evaluation
Duke Energy
November 30, 2016
SUBMITTED BY:
Dewberry
2610 Wycliff Road
Suite 410
Raleigh, NC 27607
6Y11:3uI1�1��7C�71
Duke Energy

Table of Contents
ExecutiveSummary...............................................................................................2
1. Introduction and Project Approach..............................................................3
2. Phase II Basis of Design................................................................................5
2.1 Potable Water Connection Mapping..............................................................5
3. Site Analysis...................................................................................................6
3.1 Station Mapping and Household Data.......................................................... 6
3.2 Field Observations..........................................................................................6
3.3 Other Considerations..................................................................................... 6
4. Regulatory Permitting....................................................................................7
Appendix A: Riverbend Station Phase II Mapping
Appendix B: Riverbend Station Household Data Spreadsheet
Dewberry Duke Energy Riverbend Station Phase 11 Potable Water Programmatic Evaluation 1

Executive Summary
This Phase II evaluation is structured to comply with the requirements of North Carolina House Bill 630:
Section 13oA-309.211.(ci) of House Bill 63o requires provision of permanent water supply for each household that has a
drinking water supply well located within a 1/2 mile radius from the established compliance boundary of a coal combustion
residuals impoundment, and is not separated from the impoundment by the mainstem of a river, or other body of water that
would prevent the migration of contaminants through groundwater from the impoundment to a well.
To address the provisions of House Bill 63o, Dewberry performed this Phase II preliminary engineering evaluation to supply
potable water to residents within a 1/2 mile of the compliance boundary. Preparation of this report is intended to comply with
the House Bill 63o requirement to make a report submittal to the North Carolina Department of Environmental Quality (DEQ)
by December 15, 2016.
Several project review phone and email communications were conducted in August 2016 between Duke Energy, Dewberry, and
the City of Mount Holly.
Detailed Phase II mapping was developed using Gaston County property maps that show each household in the 1/2 mile
compliance buffer. Dewberry visually observed the households shown on the Phase II mapping on September 9, 2o16.
A household database was developed using Gaston County tax records tied to the GIS shape file which identifies the property
owner and the address for each household within the 1/2 mile compliance buffer.
An opinion of probable cost was not developed for this station as there are no households within the buffer that require
permanent water supply and therefore no water line extensions or service lines are required.
This report provides additional detail on the Project Approach, Basis of Design, and Site Analysis. Riverbend Steam Station
mapping is provided in Appendix A. The household database is provided in Appendix B.
11:14-
Dewberr
Y Duke Energy I Riverbend Station Phase 11 Potable Water Programmatic Evaluation 12

1. Introduction and Project Approach
PROJECT INTRODUCTION
During the Phase I programmatic potable water evaluation desktop study, concept level mapping was developed showing the
Riverbend Steam Station location, the potential potable water tie-in location, and potential pipe routing to residents within a
1/2 mile of the compliance boundary. While the Phase I effort indicated that there were no households being served by wells
within the compliance buffer, the Phase II work was initiated to further evaluate whether all parcels are connected to a public
water supply.
This Phase II evaluation is structured to comply with the requirements of North Carolina House Bill 630: Section 13oA-
309.211.(c1), which requires provision of permanent water supply for each household that has a drinking water supply well
located within a 1/2 mile radius from the established compliance boundary of a coal combustion residuals impoundment, and is
not separated from the impoundment by the mainstem of a river, or other body of water that would prevent the migration of
contaminants through groundwater from the impoundment to a well.
To address the provisions of House Bill 63o referenced above Dewberry has performed a Phase I screening level evaluation and
this Phase II preliminary engineering evaluation of the technical and economic feasibility to supply municipal potable water to
residents within a 1/2 mile of the compliance boundary. The Phase II evaluation results were used to prepare the submittal to
the North Carolina Department of Environmental Quality (DEQ) by December 15, 2016 as required by House Bill 630.
Dewberry Duke Energy I Riverbend Station Phase 11 Potable Water Programmatic Evaluation 13

PROJECT APPROACH
Dewberry contacted the Duke Energy Community Relations District Manager to discuss the information needed to execute the
Phase II evaluations, and to arrange for subsequent communication with City of Mount Holly.
Several phone and email communications were conducted in August 2o16 between the City of Mount Holly, Duke Energy, and
Dewberry to discuss execution of this Phase II preliminary evaluation and subsequent project execution. The primary purpose
of the meeting was to confirm the water distribution system tie-in location, system pressure, pipe size, and water quality at the
tie -location, capacity limitations, and whether there are future planned water system projects that could impact the Phase II
evaluation. Dewberry also inquired as to whether any households within a 1/2 mile of the compliance boundary were presently
being served by municipal potable water.
During Phase I Dewberry obtained municipality mapping of the potable water distribution system and then developed draft
maps showing the Riverbend Steam Station, the respective potable water distribution system tie-in location, and the water line
pipe routing. We used the Duke Energy Drinking Water Receptor Surveys for Coal-fired Power Stations developed in 2014 to
show compliance boundaries and the water supply wells within a 1/2 mile of the compliance boundary. The maps were
prepared using GIS as the native software.
During Phase II we developed more detailed mapping based on Gaston County property maps to identify property owners and
household addresses within the 1/2 mile compliance buffer. For the Phase II analysis property parcels that were wholly or
partly within the compliance buffer were included in the evaluation.
Using the Phase II mapping a database of property owners and household locations was developed. Dewberry also contacted
the City of Mount Holly to confirm which residents along the existing water lines within the compliance buffer are currently
connected to the system.
Dewberry Duke Energy I Riverbend Station Phase 11 Potable Water Programmatic Evaluation 14

2. Phase II Basis of Design
The purpose of this section is to document basis of design assumptions that were used to prepare the Riverbend Steam Station
mapping.
2.1 POTABLE WATER CONNECTION MAPPING
Key assumptions for the potable water connection mapping are as follows:
The households within the 1/2 mile buffer are currently served public potable water and new waterline piping or additional
service line connections are not required.
4jDewberry Duke Energy Riverbend Station Phase 11 Potable Water Programmatic Evaluation 15

3. Site Analysis
3.1 STATION MAPPING AND HOUSEHOLD DATA
The Phase II overall map in Appendix A shows the existing City of Mount Holly potable water supply system, indicating that a
new potable waterline extension is not required to serve households within the 1/2 mile compliance buffer.
The Phase II Site map in Appendix A was prepared by overlaying Gaston County property maps onto the compliance
boundaries detailed in the Duke Energy Drinking Water Receptor Surveys for Coal-fired Power Stations developed in 2014.
The Appendix A Site map shows the 1/2 mile compliance buffer. Dewberry visually observed households shown in the Appendix
A sheet mapping.
The household database in Appendix B was created from the Gaston County tax records tied to the GIS shape file which
identifies the property owner and the address for each household within the 1/2 mile compliance buffer, including parcels of
land with no residents (empty lot). The parcel data listed on the spreadsheets also includes Parcel ID, Land Use, Easement
Requirement, and anticipated Water Demand for each property. Engineering judgment was utilized in cases where homes were
located out of sight from the road and multiple structures could be seen during an aerial review.
3.2 FIELD OBSERVATIONS
A drive -by of the area encompassing the 1/2 mile compliance buffer was completed to confirm the information provided by the
City of Mount Holly. The City of Mount Holly confirmed that all households within the 1/2 mile buffer are connected to City
water.
As shown in Appendix A, installation of new waterline or service connection piping is not required for this project.
3.3 OTHER CONSIDERATIONS
Since there are no proposed water line extensions or service connections to an existing waterline, there is no anticipated
impact on the water demand, pressure, or water quality of the City of Mount Holly system.
Dewberry Duke Energy I Riverbend Station Phase 11 Potable Water Programmatic Evaluation 16

4. Regulatory Permitting
Since there is no proposed waterline extension associated with this station, North Carolina permits for Encroachment
Agreements, Erosion and Sedimentation Control, and Public Water Supply are deemed not applicable.
'� Dewberry Duke Energy I Riverbend Station Phase 11 Potable Water Programmatic Evaluation 17

Appendix A: Riverbend Station
Phase II Mapping
www.dewberry.com

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