NCR000147280_Piedmont Natural Gas_CEI_20190603_Martin

Document Category: Facility
Document Group: Inspection/Investigation (I)
Document Type: Compliance Evaluation Inspection (CEI)
LASERFICHE FILE TRANSMITTAL FORM
DIVISION OF WASTE MANAGEMENT
HAZARDOUS WASTE SECTION
Your Name: Andrew Martin
EPA ID: NCR000147280
Facility Name/Subject: Piedmont Natural Gas Huntersville LNG
Document Date: 06/03/2019
Description: Non-commercial TSD Inspection. No issues
Author: Andrew Martin
Facility/Site Address: 11001 McCoy Road
Facility/Site City: Huntersville
Facility/Site Zipcode: 28078
Facility/Site State: North Carolina
Facility/Site County: Mecklenburg
File Room Use Only
Month Day Year
Date Received
by File Room
Date Scanned
Branch/Unit: Compliance Branch-Western Region
(or Inspection Date)
PIEDMONT NATURAL GAS HUNTERSVILLE LNG CEI FY2018 1
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QULALITY
DIVISION OF WASTE MANAGEMENT
HAZARDOUS WASTE SECTION

TREATMENT, STORAGE, AND DISPOSAL FACILITY (TSDF)
COMPLIANCE EVALUATION INSPECTION (CEI) REPORT

Facility Name – Piedmont Natural Gas Huntersville LNG
Facility Address – 11001 McCoy Road, Huntersville, NC 28078 (Mecklenburg County)
Facility Contact – Stephen Barrick (Duke Energy) – 980-373-8733
EPA ID Number – NCR 000 147 280
Inspector(s) – Andrew Martin – ESII NCDENR
Date of Inspection – June 3, 2019
Last inspection Date – March 29, 2018
Generator Status – CESQG
Inspection Type – Compliance Evaluation Inspection (CEI)
Present at Inspection – Stephen Barrick – Senior Environmental Specialist; Tony Bridges – PNG Plant Manager; Ken
Seizmore – Duke Energy’ Robert Sapp – Duke Energy; HWS; Andrew Martin – ESII NCDEQ HWS
Facility Description: Piedmont Natural Gas Huntersville LNG (PNG) is a liquid natural gas extraction facility located in
Huntersville, NC. There are eight buildings located within perimeter security fencing. A scheduled Compliance Evaluation
Inspection (CEI) was conducted to review the condition of wells installed onsite for groundwater monitoring.
In 2008, spent filter material in the form of waste ceramic pellets, used to remove carbon dioxide from the gas line received by
Piedmont Natural Gas, was discovered buried on PNG’s property adjacent to a gas line right-of-way. This area was found to
have benzene and trichloroethylene contamination. In 2009, an interim Closure Report prepared by MACTEC determined that
three separate burial pits were in place with 790 tons of soil excavated. A March 23, 2010 Closure Report for the Filter Media
Area provided information that an additional 6,350 tons of soil was excavated. On April 11, 2012, an Administrative Order on
Consent was issued to PNG to develop a Site Assessment Plan to determine the lateral and vertical extent of groundwater
contamination; a remedial strategy to set out a plan for developing and evaluating remedies for the impacted groundwater; a Site
Wide Monitoring Program; design and implement a program to monitor contamination in an around the site; and develop a
Remediation Program to implement the approved Remedial Strategy.
On July 12, 2017, PNG submitted a groundwater monitoring report for sampling activities conducted in April 2017. Data from
the July 2017 report showed that contaminants were still detectable in site monitoring wells above NC 2L standards. The deadline
to demonstrate “clean closure” passed and the Facility was transferred to the NCDEQ Hazardous Waste Section, Facility
Management Branch for oversight.
Monitoring well MW-7S was abandoned on 10/16/2014 using 6.5 gallons of neat cement grout. The proactive steel, stick up
casing, and concrete pad were removed.
At the time of the inspection, the facility was operating as a Conditionally Exempt Small Quantity Generator (CESQG).
Facility Description
 Distance to closest residence – Approximately 0.2 miles
 Distance to closest off-site well – Private drinking water wells on adjacent properties
 Water supply – Charlotte Water
 Sewage – Charlotte Water
 Operating shifts – 3 shifts Monday – Sunday (24/7)
 Number of employees – Approximately 10
 Size of facility – Approximately 471 acres.
PIEDMONT NATURAL GAS HUNTERSVILLE LNG CEI FY2018 2
Monitoring Well Semi-Annual Sampling Report – A groundwater monitoring report, dated July 2018 was reviewed. The
report was written for well samples collected on April 18 through 20, 2017. It was discussed that monitoring wells were most
recently sampled in October 2018 and the report was being prepared.
Monitoring Wells – After abandoning well MW-7S, PNG has one singe well, four sets of two wells and two sets of three wells,
for a total of 15 wells. Each well is set at different depths. Based on AMEC Environment and Infrastructure February 2014
Groundwater Quality Map, wells with a “S” identifier were installed with a screened interval set in the overburden aquifer and
wells with a “D” identifier were installed with a screen set in the upper bedrock aquifer. In total, all 15 wells were observed
during the inspections, including: 1S, 1D, 2, 2D, 2S, 3S, 3D, 4S, 4D, 5S, 5D, 6S, 6D, 7D. All wells appeared to be in good
condition. Concrete bollards have been installed near each set of wells. Monitoring well concrete pads were observed to be free
of cracks and the well caps were locked. No signs of erosion were observed around the concrete pads. In addition, all of the
wells are located within a monitored and locked fence.
The facility is currently scheduled to conduct semi-annual sampling. The facility inspects and documents each well for signs of
erosion, cracking of the concrete base, well cap locked, and any other sign of damage or other concerns that should be corrected
to maintain the integrity of the well. Any monitoring well inspection documents should be maintained onsite for future reference
and review during annual RCRA inspections.
This facility is not subject to Financial Assurance regulations at this time.
Site Deficiencies – None.

6/3/2019 Sent via E-mail
RCRA Inspector / Date Facility Contact

Cc: Stephen Barrick – Duke Energy at [e-mail]
Sean Morris – Compliance Branch Western Unit Supervisor
Mike Babuin – Facility Management Branch
Central Office Files