4204_Halifax_HC Ash Monofill Annual Report 2018-12-04

Annual CCR Landfill Inspection Report
Inspection Date: December 4, 2018

Halifax County Ash Monofill
Halifax County, North Carolina

Prepared for:

Halifax County Department of Public Utilities
Halifax, North Carolina

March 2019

Prepared by:

© 2019 Smith Gardner, Inc.
This document is intended for the sole use of the client for which it was prepared and
for the purpose agreed upon by the client and Smith Gardner, Inc..

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Annual CCR Landfill Inspection Report
Inspection Date: December 4, 2018

Halifax County Ash Monofill
Halifax County, North Carolina

Prepared For:
Halifax County Department of Public Utilities
Halifax, North Carolina

S+G Project No. HALIFAX-18-1

Joan A. Smyth, P.G.
Vice President, Senior Hydrogeologist

Pieter K. Scheer, P.E.
Vice President, Senior Engineer

March 2019

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3/14/2019

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Halifax County Ash Monofill Annual CCR Landfill Inspection Report
March 2019 Table of Contents Page i
Halifax County Ash Monofill
Halifax County, North Carolina

Annual CCR Landfill Inspection Report
Inspection Date: December 4, 2018

Table of Contents
Page

1.0 INTRODUCTION ................................................................................................................... 1 
2.0 REVIEW OF AVAILABLE INFORMATION .............................................................................. 1 
3.0 INSPECTION SUMMARY ...................................................................................................... 2 
3.1 Participants ............................................................................................................... 2 
3.1 Observed Conditions ................................................................................................. 2 
3.1.1 Existing Cover ................................................................................................ 2 
3.1.2 Run-On and Run-Off Control System ........................................................... 3 
3.2 Changes in Geometry ................................................................................................ 3 
3.3 Approximate Volume of CCR ..................................................................................... 3 
3.4 Structural Weakness or Disrupting Conditions ....................................................... 4 
3.5 Other Changes Affecting Stability or Operations ..................................................... 4 
4.0 RECORDKEEPING, NOTIFICATION, AND INTERNET POSTING REQUIREMENTS .............. 4 
4.1 Recordkeeping Requirements .................................................................................. 4 
4.2 Notification Requirements ........................................................................................ 4 
4.3 Internet Posting Requirements ................................................................................ 5 
5.0 PROFESSIONAL ENGINEER’S CERTIFICATION .................................................................. 5 

FIGURE
Figure 1 Site Photo

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Halifax County Ash Monofill Annual CCR Landfill Inspection Report
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Halifax County Ash Monofill Annual CCR Landfill Inspection Report
March 2019 Page 1
1.0 INTRODUCTION
Halifax County (County) owns and operates a geomembrane lined monofill (ash monofill) for
disposal of coal combustion residuals (CCR) at the County’s landfill facility located at 921 Liles
Road Littleton, North Carolina. The ash monofill, which currently consists of 2 cells covering
approximately 20.8 acres, was used for disposal of CCR generated solely from the
Westmoreland Partners Roanoke Valley Energy Facility (ROVA) located in Weldon, North
Carolina and is currently in the process of being closed. A site photo showing the ash monofill
as well as the northern portion of the landfill facility is provided as Figure 1.

This report documents an inspection of the ash monofill conducted on December 4, 2018 by Mr.
Pieter K. Scheer, P.E. of Smith Gardner, Inc. (S+G) and is intended to satisfy the annual
inspection requirements of 40 CFR Part 257.84(b)(1) and (b)(2), which require periodic
inspections by a qualified professional engineer and preparation of an inspection report. This
report includes S+G’s review of available information (Section 2.0) and a summary of the
December 4th inspection (Section 3.0) including findings related to changes in geometry, volume
of CCR in place, and appearances or changes which may affect stability, operation, and/or safety
of the ash monofill. Recordkeeping, notification, and internet posting requirements are
addressed in Section 4.0.

2.0 REVIEW OF AVAILABLE INFORMATION
Related to the inspection, the following documents were reviewed by S+G:

 NC Solid Waste Permit No. 42-04 INDUS, issued by the NC Department of Environmental
Quality Division of Waste Management, dated June 3, 2016.
 Operations Manual, Halifax County Landfill Facility, prepared by Smith Gardner, Inc.,
dated February 2016.
 Design Report, Halifax County Ash Monofill, prepared by Hazen and Sawyer, P.C., dated
March 1992.

S+G also reviewed and discussed the County’s record keeping practices with County personnel.
This record keeping includes weekly inspections conducted by County personnel in accordance
with 40 CFR Part 257.84(a).

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3.0 INSPECTION SUMMARY
This section summarizes the December 4, 2018 inspection and notes S+G’s findings related to:

 Changes in Geometry (Section 3.2);
 Approximate Volume of CCR (Section 3.3);
 Structural Weakess or Disrupting Conditions (Section 3.4); and
 Other Changes Affecting Stability or Operations (Section 3.5).

Areas observed by S+G during the inspection included both top slopes (top deck) and side slopes
of the monofill, the sump area (south end of the monofill) including the sump riser structure,
the perimeter of monofill including surface drainage, and the internal stormwater basin
including the inflow pipe (from the monofill sump) and the discharge riser/barrel structure.

3.1 Participants
The following individuals participated in the inspection:

 Pieter Scheer, P.E., Smith Gardner, Inc.
 Greg Griffin, Halifax County Public Utilities, Director
 Ed Stanfield, Halifax County Public Utilities, Solid Waste Supervisor.

3.1 Observed Conditions
Areas and structures observed by S+G during the inspection included both top slopes
(top deck) and side slopes of the monofill, the sump area (south end of the monofill)
including the sump riser structure, the perimeter of monofill including surface drainage,
and the internal stormwater basin including the inflow pipe (from the monofill sump)
and the discharge riser/barrel structure. In general, the ash monofill appeared to be in
a well-maintained condition at the time of inspection. Closure construction activities (by
Glover Construction Co., a contractor to the County) were on-going at the time of the
inspection, but little activities had taken place yet on the monofill.

3.1.1 Existing Cover
At the time of inspection, approximately 8.5 acres of the ash monofill (northern
western, and eastern slopes) was covered by vegetated intermediate soil cover,
which is graded to allow drainage of run-off to perimeter drainage features
(channels and basins). The vegetation on the intermediate soil cover was mostly
dormant at the time of inspection but appeared to be in good condition.
Additionally, a temporary Posi-Shell cover (on the southern slope) (placed in
December 2017) was mostly intact. Some erosion of the Posi-Shell cover was
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Halifax County Ash Monofill Annual CCR Landfill Inspection Report
March 2019 Page 3
observed. However, this was as expected being that this is a temporary cover
and will be removed as part of the current closure project.

The approximate areas of existing intermediate soil cover and Posi-Shell cover
are shown on Figure 1. The remaining approximately 10.0 acres of the ash
monofill (top deck) consisted of exposed CCR which was graded to drain to the
sump area on the south end of the monofill. The surface of the exposed CCR on
the top deck was in good shape with some rill erosion noted where water
concentrates. There was no evidence of eroded CCR materials outside of the
lined area.

3.1.2 Run-On and Run-Off Control System
The run-on control system for the ash monofill consists of perimeter grades and
drainage measures (channels and sediment basins) which prevent run-on from
entering the ash monofill and contacting exposed CCR. The run-off control
system consists of:

1) The direct run-off from intermediate soil cover to the perimeter of the
ash monofill (and to one of the sediment basins); and

2) The collection of run-off from exposed CCR and Posi-Shell covered
surfaces and routing through the sump and internal stormwater basin.
Both the sump and internal stormwater basin have riser structures and
gravel filters to allow CCR in the runoff to drop out of suspension before
discharge.

Both the run-on and run-off control system appeared to be in good working order
and in accordance with the design for the facility.

3.2 Changes in Geometry
Since the last inspection (January 29, 2018), the geometry of the ash monofill was
essentially unchanged as no CCR was disposed of during this period.

3.3 Approximate Volume of CCR
Based on County scale records, approximately 747,484 tons of CCR has been disposed of
in the ash monofill as of December 4th, 2018. The approximate volume of CCR (and
intermediate soil cover) contained in the ash monofill as of December 4th, 2018 is
954,000 cubic yards (CY).

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Halifax County Ash Monofill Annual CCR Landfill Inspection Report
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3.4 Structural Weakness or Disrupting Conditions
No appearances of actual or potential structural weakness or conditions which are or
have the potential to disrupt the operation and safety of the ash monofill were observed
during the December 4, 2018 inspection.

3.5 Other Changes Affecting Stability or Operations
No other changes which may have affected the stability or operation of the ash monofill
since the last inspection (January 29, 2018) were observed during the December 4, 2018
inspection.

4.0 RECORDKEEPING, NOTIFICATION, AND INTERNET POSTING REQUIREMENTS
Per 40CFR Part 257.84(c), Halifax County will comply with recordkeeping, notification, and
internet posting requirements as follows below.

4.1 Recordkeeping Requirements
The County will place a copy of periodic inspection reports in the the Operating Record
as required under 40CFR Part 257.105(g)(6).

4.2 Notification Requirements
The County will notify the State Director as required under 40CFR Part 257.106(g)(5)
when periodic inspection reports are made available in the Operating Record.

Notification will be made to the following individuals:

North Carolina Department of Environmental Quality (DEQ)
Raleigh Central Office
Division of Waste Management
217 W. Jones Street
Raleigh, NC 27603
1646 Mail Service Center
Raleigh, NC 27699-1646
Phone/Fax: [phone]

Mr. Michael Scott - Director
Ms. Sherri Stanley – Permitting Branch Head
Ms. Shawn McKee – Waste Management Specialist

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4.3 Internet Posting Requirements
The County will post periodic inspection reports within 30 days of placing them in the
Operating Record.

5.0 PROFESSIONAL ENGINEER’S CERTIFICATION
Based on my inspection of the Halifax County Ash Monofill in Halifax County, North Carolina on
December 4, 2018 and review of available information, the design, construction, operation, and
maintenance of the CCR unit appears to be consistent with recognized and generally accepted
good engineering standards.

Pieter K. Scheer, P.E.
Printed Name of Registered Professional Engineer

Signature of Registered Professional Engineer

March 14, 2019 21666 NC
Date Registration No. State

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G:\CAD\Halifax\Halifax 18-1\sheets\HALI-A0326.mxdDRAWN:APPROVED:SCALE:FIGURE NO.:PROJECT NO.:DATE:
C.T.J.P.K.S.1AS SHOWN Mar. 2019 HALIFAX 18-1
HALIFAX COUNTY ASH MONOFILL
SITE PHOTO
³
0 200 400 600 800Feet
ASH MONOFILL
CELLS 1&2
SCALE HOUSE
AND SCALES
OFFICE/MAINTENANCE
BUILDING
TRANSFER STATION
L IL E S R O A D
SUMP
GRAVITY MAIN
INTERNAL STORM
WATER BASIN
LIMIT OF LINER
INTERMEDIATE
SOIL COVER
REFERENCE: IMAGERY FROM AERIAL SURVEY DATED
JUNE 18, 2018 PERFORMED BY GEODATA CORPORATION,
ZEBULON, NC.
POSI-SHELL COVER
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