NC0004961_RBSS CSA Report_Appendix B_Receptor Survey Update_20150818

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.
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