NC0003468_Supplement to WSW and Receptor Survey_20141106

DAN RIVER COMBINED CYCLE STATION
ASH BASIN
Supplement to Drinking
Water Supply Well and
Receptor Survey
NPDES Permit NC0003468

November 6, 2014

Duke Energy Carolinas, LLC | Dan River Combined Cycle Station Ash Basin
Supplement to Drinking Water Supply Well and Receptor Survey
SECTION 1 – INTRODUCTION AND BACKGROUND

1
Section 1 – Introduction and Background
HDR is pleased to provide the attached figure and table presenting identified updates for the
Drinking Water Supply Well and Receptor Survey at the Duke Energy Carolinas, LLC (Duke
Energy) Dan River Combined Cycle Station (DRCCS). The updated information was obtained
from responses to water supply well survey questionnaires mailed to property owners within a
0.5-mile radius of the Dan River ash basin compliance boundary requesting information on the
presence of water supply wells and well usage. This supplement provides the background on
the development of this information.
Duke Energy owns and operated the Dan River Steam Station (DRSS), located on the Dan
River in Rockingham County near Eden, North Carolina. In 2012, the DRSS was retired from
service. DRSS historically used two ash basins for disposal of ash generated by the coal
combustion process.
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, which included
requirements to perform a receptor survey. HDR submitted the Dan River Combined Cycle
Station Ash Basin, Drinking Water Supply Well and Receptor Survey, NPDES Permit
NC0003468, dated September 30, 2014 (Survey) to satisfy the requirements outlined in NC
Senate Bill 729 and the NORR. The scope of this Survey included identification of all receptors
within a 0.5-mile radius (2,640 feet) of the Dan River ash basin compliance boundary. The
compliance boundary for groundwater quality in relation to the ash basin is defined in
accordance with 15A NCAC 02L .0107(a) as being established at either 500 feet from the waste
boundary or at the property boundary, whichever is closer to the source. The receptors
included public and private water supply wells (including irrigation wells and unused or
abandoned wells) and surface water features within a 0.5-mile radius of the Dan River ash basin
compliance boundary. HDR also identified public water supplies and wellhead protection areas
(if present) within a 0.5-mile radius of the Dan River ash basin compliance boundary. A
potential area of interest with respect to the Dan River ash basin groundwater flow was
delineated and presented in the Survey. Based on the available information, this area is
considered to be potentially downgradient from the Dan River ash basin.
Duke Energy Carolinas, LLC | Dan River Combined Cycle Station Ash Basin
Supplement to Drinking Water Supply Well and Receptor Survey
SECTION 2 – WATER SUPPLY WELL SURVEY QUESTIONNAIRE APPROACH

Section 2 – Water Supply Well Survey
Questionnaire Approach
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 Dan River 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 Rockingham
County GIS database 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 252 surveys were mailed to property
owners.
Questionnaire responses received after October 31, 2014 will be incorporated into the
Groundwater Assessment Report required by Senate Bill 729 (Section 130A-309.209(a)(4)).

Duke Energy Carolinas, LLC | Dan River Combined Cycle Station Ash Basin
Supplement to Drinking Water Supply Well and Receptor Survey
SECTION 3 – WATER SUPPLY WELL SURVEY QUESTIONNAIRE RESULTS

Section 3 – Water Supply Well Survey
Questionnaire Results
Based on the returned water supply well surveys, the following revisions have been made to the
previously submitted information and are reflected in Figure 1 and Table 1 attached to this letter:
• One (1) of the previously reported 2 “field identified” private water supply wells was
confirmed to have private a water supply well located on the property. This well is now
identified as a “reported” private water supply well on Figure 1 and Table 1. The Well ID
with revised designation is 1.
• One (1) of the previously reported 2 “field identified” private water supply wells does not
have a private water supply well located on the property. The well symbol and identifier
previously associated with well 2 has been removed from Figure 1 and Table 1.
• Two (2) new water supply wells have been identified based on information provided in
the returned questionnaires. These wells are identified as “reported” private water
supply wells on Figure 1 and Table 1. The new Well IDs include 3 and 5.
• One (1) new water supply spring which is currently not in use by the property owner has
been identified based on information provided in the returned questionnaires. This
spring is identified as “reported private water supply spring” on Figure 1 and Table 1.
The new ID is 4. The property does not have a physical address associated with it;
however, it is located off South Edgewood Road.
• One (1) new abandoned well has been identified based on information provided in the
returned questionnaires. This well is now identified as “abandoned” private water supply
well on Figure 1 and Table 1. The new Well ID is 6.

Attachments
Figure 1 Drinking Water Supply Well and Receptor
Survey - Updated November 6, 2014
Table 1 Public and Private Water Supply Wells –
Updated November 6, 2014

Table 1
Public and Private Water Supply Wells - Updated November 6, 2014
Within 0.5 Mile Radius of Dan River Ash Basin Compliance Boundary
Duke Energy Carolinas, LLC/Dan River Combined Cycle Station
Page 1 of 1
Well ID
(shown on Figure 1)
Public Water
System Name Well Owner Property Address
(well location)Parcel ID Number Reported
Well Use
Approximate
Distance from
Ash Basin
Compliance
Boundary (ft)
Direction from
Ash Basin
Well
Depth
(ft-bgs)
Well
Casing
Depth
(ft-bgs)
Well
Yield
(gpm)
1 N/A 329 Partners, LLC 880 Town Creek Road
Eden, NC 27288
798916947057
(Rockingham County) Domestic 2,225 Southeast of Ash
Basin Primary Cell 575 575 N/A
3 N/A Chris Barger 212 S. Edgewood Road
Eden, NC 27288
708016823927
(Rockingham County)
Domestic--drinking,
swimming pool 2,400 North of Ash
Basin Primary Cell N/A N/A N/A
5 N/A Cheryl C. Brady 388 River Ridge Road
Eden, NC 27288
798915635341
(Rockingham County)
Domestic--
drinking/livestock 2,450 Southwest of Ash
Basin Primary Cell N/A N/A N/A
4 N/A John T. Gardner S. Edgewood Road
Eden, NC 27288
708016825806
(Rockingham County)
Domestic--currently not in
use 2,200 North of Ash
Basin Primary Cell N/A N/A N/A
6 N/A Faye Light 717 Camellia Lane
Eden, NC 27288
708020812408
(Rockingham County)
Filled and concrete capped-
-municipal water used 1,000 North of Ash
Basin Primary Cell N/A N/A N/A
Notes:
1. Well locations are shown on Figure 1.
2. Owner and property address information for water supply wells obtained from Rockingham County's online database.
3. Distances between water supply wells and the ash basin compliance boundary are approximate.
4. N/A indicates not available.
5. (ft-bgs) indicates feet below ground surface.
6. (gpm) indicates gallons per minute.
Reported Private Water Supply Spring
Reported Private Water Supply Wells
Abandoned Private Water Supply Well