7301_PersonCoLFGCAP_DIN27166_20161202 (2)

December 2, 2016

Ms. Christine Ritter
NCDEQ DWM Solid Waste Section
1646 Mail Service Center
Raleigh, North Carolina 27699-1646

RE: Landfill Gas Mitigation Plan
Person County Closed MSW Landfill
Roxboro, North Carolina

Dear Ms. Ritter:

Smith Gardner, Inc. (S+G) is pleased to provide this response to your July 20, 2016 letter1
(Attachment A) regarding Methane Gas Exceedances at the Person County Closed MSW
Landfill on behalf of Person County. S+G has been assisting Person County with landfill gas
monitoring and management at the closed Person County MSW landfill. The site is located
near Roxboro, North Carolina and is shown on Figure 1.

Site Background
In 2012, Person County received a Notice of Deficiency2 from NCDENR in response to a lack
of landfill gas monitoring as required by the Person County Post-Closure Conditions. S+G
performed a limited soil gas survey and a limited evaluation of the edge of waste to better
define conditions near two homes located west of the landfill. These homes were and
continue to be the only nearby potentially sensitive receptors for landfill gas. The majority of
the landfill site is surrounded by surface water streams which naturally prevent landfill gas
migration; therefore, this investigation is focused on this western portion of the site. Due to
the detection of LFG above 100% of the lower explosive limit (LEL) at the property line, a
plan3 for LFG mitigation was prepared by S+G and submitted to NCDENR. Following
approval, S+G oversaw the installation of a LFG monitoring network, a LFG passive vent
trench and two passive vent wells along the western property boundary. Monthly monitoring
has been performed since the LFG monitoring well installation at the facility.

Corrective Action Plan
Methane gas continues to be detected above the LEL at monitoring probes LFG-1 and LFG-2
indicating the passive trench and vent wells are not effectively controlling LFG migration at
the Closed MSW Facility. As requested, this letter includes the proposed Corrective Action
procedures for mitigation of LFG at the site, a contingency plan and planned implementation
schedule.

1 Methane Gas Exceedance letter from Christine Ritter of NCDEQ to Person County Dated July 20, 2016, DIN 26508
2 Notice of Deficiency Letter from John Patrone of NCDENR to Person County Dated April 4, 2012.
3 Landfill Gas Mitigation Plan, letter from Smith Gardner, Inc. to Christine Ritter of NCDENR, dated September 20, 2012.
Ms. Ritter
December 2, 2016
Page 2

In 2012, the western portion of the site was investigated and the landfill gas extent was
defined; therefore, additional investigation is not warranted at this time. Due to the location
of the two homes near the western property boundary, and the presence of LFG in this area,
the corrective action will focus on this area.

System Modifications
Person County is committed to remediating LFG at the property line. We believe that
modifying their existing system from a passive vent system to an active LFG system will
achieve this goal. The most cost effective way is to install two passive solar flares.

S+G will connect the vent trench and vent wells to these solar flares. The current 6-inch PVC
trench vents will be capped off, and connected to one solar flare at the northern edge of the
trench via a valve and header pipe. The valves will allow focused recovery in areas of the
trench exhibiting the greatest LFG migration. The passive vent wells will also be connected
to a header pipe and connected to the second solar flare. Collected LFG will be combusted
at the flare tip.

Monitoring points will be added to the previous vent and well locations to refine LFG
collection from areas with the highest concentrations. S+G proposes to use a Solar Spark
CF-10 Vent Flare. The flare will be observed with monthly monitoring to ensure it is
operating as designed. Due to low LFG flows, a flame my not be visible, however, visible heat
distortion from the flare may be observed. Solar Flare details are provided in Attachment B.

Contingency Plan
S+G will continue to perform monthly monitoring at the facility and will monitor system
performance and adjust LFG collection as needed to focus on areas with greatest LFG
concentrations. If no change is observed in %LEL in LFG-1 and LFG-2 after a minimum of 24
to 36 months the trench will be extended past LFG-1 and additional trench will be installed in
the vicinity of LFG-2 and attached to the flare system. No further evaluation of the system
will be performed at that time.

Mitigation Schedule
The anticipated schedule for this mitigation plan for the facility is presented below:

 Within 120-days of this plan’s approval the flares will be installed and the
modifications to the vent trench pipes and vent wells will be completed.

 A report summarizing the field activities related to this corrective action plan
will be submitted to NCDEQ within 60 days of completion of all field work.
This report will include a summary of key features.

 Monthly monitoring of the LFG monitoring wells and nearby structures as
outlined in the approved LFG Monitoring Plan4 (Attachment C) will be ongoing

4 Landfill Gas Monitoring Plan for Person County Landfill Facility, September 2012.
Ms. Ritter
December 2, 2016
Page 3

while LFG exceeds 100% at the property line. This data will continue to be
submitted to NCDEQ following completion of each monitoring event.

Record Keeping Program
The facility shall maintain documents relating to the flare system and LFG monitoring in an
operating record located at the office of the General Services Manager or his designee.
These records may be presented, on request, to DWM for inspection.

If you have any questions, or require additional information, please contact us at your earliest
convenience at 919-828-0577 or by e-mail (address below).

Sincerely,
Smith Gardner, Inc.

Madeline German, P.G. Joan A. Smyth, P.G.
Project Geologist Senior Hydrogeologist
[e-mail] ext. 222 [e-mail] ext. 221

Figure 1: Site Map
Figure 2: Remedial Strategy

Attachments: July 20, 2016 letter from DEQ
Flare Details
Updated Landfill Gas Monitoring Plan

CC: Ray Foushee – Person County
Ervin Lane – NCDEQ
John Patrone - NCDEQ
File

H:\Projects\Person County\Person (LFG remed ph2)\LFG Mitigation Plan Letter.docx
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Figures

Landfill Gas Mitigation Plan
Person County Closed MSW Landfill
Roxboro, North Carolina

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MW-1
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LANDFILL GAS
COLLECTION TRENCH

Attachments

Landfill Gas Mitigation Plan
Person County Closed MSW Landfill
Roxboro, North Carolina

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Solar Spark® Technical Information:
Solar Ignition Specifications
SFI-100 (6-volt system) SFI-200 (12-volt system)
Solar Collector 6" x 13" (15.2 cm x 33 cm)
Solar-electric trickle charge
plate
13" x 13" (33 cm x 33 cm)
Solar-electric trickle charge
plate
Battery 6-volt rechargeable gel cell 12-volt rechargeable cell
Dark Time Endurance 21 days in darkness
(with full-charged system)
14 days in darkness
(with full-charged system)
Spark Interval 1.5 seconds continuous 1.25 seconds continuous
Spark Plug Type LSC SparkPilot LSC SparkPilot
SparkPilot Replacement
Frequency
Greater than 1 year
(average)
Greater than 1 year
(average)
Ignition Wire Insulated ignition cable Insulated ignition cable
Flame Zone Spark Strap 1/8"(3.2mm) stainless steel 1/8" (3.2mm)stainless steel
Grounding Stake Galvanized steel with eyelet
terminal
Galvanized steel with eyelet
terminal
Shipping Weight 21 lbs (9.5kg) 31 lbs (14kg)

Landfill Gas Vent Flares

Combustion
Flarehead
Patented double expansion gas/air mixing chamber.
Heavy carbon steel construction with high-wind carburetion
profile.
Spark Pilot™ taps for extra low or normal gas flows and for
optional redundant safety ignition system.
Flame Arrester Inline stainless steel wire-gauze flame arrester.
Height 96" (2.4 meters) inlet to top of flarehead
Transmission
Pipes
Black Schedule 40 steel pipe
CF-5 - 1 1/2" (38 mm) ID
CF-10 - 2" (50 mm) ID
Ball Valve Stainless steel inner trim & ball valve
Base Bushing 4" (10.1cm) male NPT threads bushing mated to the specific
flange adapter required for local application
Shipping
Weight
75 lbs.(34 kg) - Model CF-5
83 lbs.(37.7 kg) - Model CF-10
Performance Range Data

Solar Spark® Vent Flares are specially engineered to efficiently combust waste gases over a wide range of gas
quality and flow rate.
For landfill gas containing 25-70% Methane (CH4), the flow ranges are:
Model Landfill Gas Flow (CFM)
CF-5 2-90
CF-10 5-140

Higher flow rates, normally requiring a blower, are easily achieved with minor modifications.

Contact LSC Environmental Products, LLC to find out how easy and inexpensive it is to use one of our flares to
eliminate foul odors and VOC’s (volatile organic compounds) emanating from the landfill.

Landfill Gas Monitoring Plan

Person County Landfill Facility
Roxboro, North Carolina (SWS Permit No. 73-01)

Prepared for:

Person County Department of General Services
Roxboro, North Carolina

November 2016

© 2016 Smith Gardner, Inc.
This document is intended for the sole use of the client for which it was prepared and
for the purpose agreed on by the client and Smith Gardner, Inc.

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Landfill Gas Monitoring Plan

Person County Landfill Facility
Roxboro, North Carolina (SWS Permit No. 73-01)

Prepared For:
Person County Department of General Services
Roxboro, North Carolina

S+G Project No. Person 12-1

Madeline German, P.G.
Project Geologist

Joan A. Smyth, P.G.
Senior Hydrogeologist

November 2016

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Person County Landfill Landfill Gas Monitoring Plan
November 2016 Table of Contents Page i
Person County Landfill
NC Solid Waste Permit No. 73-01
Landfill Gas Monitoring Plan

Table of Contents
Page

1.0 INTRODUCTION ......................................................................................................... 1 
1.1 Regulatory Requirements ......................................................................................... 1 
1.2 Guidance Document .................................................................................................. 2 
1.3 Contact Information .................................................................................................. 2 
1.3.1 Owner ............................................................................................................ 2 
1.3.2 Engineer ........................................................................................................ 2 
1.3.3 North Carolina Department of Environmental Quality ................................ 2 
1.4 Existing Site Conditions ............................................................................................. 3 
1.4.1 Site Geology ................................................................................................... 3 
1.4.2 Local Groundwater Regime .......................................................................... 3 
2.0 MONITORING PROGRAM ........................................................................................... 5 
2.1 Monitoring Points ...................................................................................................... 5 
2.2 Facility Structure Monitoring .................................................................................... 5 
2.3 Remedial Strategy ..................................................................................................... 5 
2.4 Monitoring and Reporting ......................................................................................... 6 
2.4.1 Frequency ...................................................................................................... 6 
2.4.2 Personnel ...................................................................................................... 6 
2.4.3 Equipment ..................................................................................................... 7 
2.4.4 Procedures .................................................................................................... 7 
2.4.5 Precautionary Action Plan ............................................................................ 8 
2.4.6 Record Keeping ............................................................................................. 8 
2.5 Maintenance .............................................................................................................. 9 
3.0 CONTINGENCY PLAN .............................................................................................. 10 
3.1 Immediate Action Plan ............................................................................................ 10 
3.1.1 Reporting and Documentation .................................................................... 10 
3.2 Remediation Plan .................................................................................................... 10 

FIGURE
Figure 1 Monitoring Location Map

APPENDIX
Appendix A Reporting Forms

Person County Landfill Landfill Gas Monitoring Plan
November 2016 Table of Contents Page ii

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Person County Landfill Landfill Gas Monitoring Plan
November 2016 Page 1

1.0 INTRODUCTION
This Landfill Gas (LFG) Monitoring Plan (plan) was prepared by Smith Gardner, Inc. (S+G) to
describe the LFG monitoring program at the Person County Landfill (NC Solid Waste Permit 73-
01), which is located at 662 Cedar Grove Church Road, Roxboro, North Carolina. This plan
describes the necessary procedures to satisfy applicable regulatory requirements (Section 1.1)
for landfill gas monitoring.

The best available site data, practices, experience and judgment were utilized to develop this
plan. However, the plan may require modifications over time to accommodate changing landfill
conditions, changing receptors in areas adjacent to and around the landfill, or other conditions
that cannot be fully anticipated.

Uncontrolled migration of LFG (particularly methane (CH4)) can result in, loss of life, injury, loss
of property, vegetative damage, and intolerable odors. Landfill monitoring includes exposure to
explosive gases. Monitoring personnel should be specifically trained in the management and
response for situations such as fire or explosion and confined space entry and possess an
awareness of changing conditions around the landfill.

Note that this plan does not address landfill gas collection and control, air quality, or other
related landfill gas regulations or requirements which may be applicable to this site at present
or in the future.
1.1 Regulatory Requirements
Rules 15A NCAC [13B.1626(4) and 13B.0544(d)] of the North Carolina Solid Waste
Management Rules requires the following:

 Owners or operators must ensure that:
o the concentration of methane gas or other explosive gases generated by
the facility does not exceed 25 percent of the lower explosive limit in on-
site facility structures (excluding gas control or recovery system
components);
o the concentration of methane gas or other explosive gases does not
exceed the lower explosive limit for methane or other explosive gases at
the facility property boundary; and
o the facility does not release methane gas or other explosive gases in any
concentration that can be detected in off-site structures.

 Owners or operators must implement a routine methane monitoring program
and perform monitoring on at least a quarterly basis.

 If regulatory limits for methane gas concentrations are exceeded, a contingency
plan must be implemented for the protection of human health and safety.

Person County Landfill Landfill Gas Monitoring Plan
November 2016 Page 2
1.2 Guidance Document
This plan was developed generally following the Landfill Gas Monitoring Guidance
document prepared by the North Carolina Department of Environment Quality (NC DEQ),
Division of Waste Management (DWM)1.
1.3 Contact Information
Correspondence and questions concerning this plan should be directed to the
appropriate contact below. For fire or police emergencies, dial 911.
1.3.1 Owner
Person County
Person County General Services Department
304 S. Morgan Street Room 222
Roxboro, North Carolina 27573
Phone: [phone]
Contacts: Mr. Ray Foushee, General Services Director
[e-mail]
1.3.2 Engineer
Smith Gardner, Inc.
14 N. Boylan Avenue
Raleigh, North Carolina 27603
Phone: [phone]
Contacts: Joan A. Smyth, P.G., Senior Hydrogeologist
[e-mail]
Pieter K. Scheer, P.E., Senior Engineer
[e-mail]
1.3.3 North Carolina Department of Environmental Quality
North Carolina DEQ - Raleigh Central Office (RCO)
217 W Jones Street
Raleigh, North Carolina 27603
Phone: [phone]
Contact: Ms. Christine Ritter
[e-mail]

North Carolina DEQ – Raleigh Regional Office
3800 Barrett Drive

1 NC DENR DWM (2010), “Landfill Gas Monitoring Guidance”, NC DENR DWM Solid Waste Section,
November 2010.

Person County Landfill Landfill Gas Monitoring Plan
November 2016 Page 3
Raleigh, North Carolina 27699
Phone: [phone]
Fax: [phone]
1.4 Existing Site Conditions
The site is located approximately 3 miles east of Roxboro, NC off Cedar Grove Church
Road in Person County. The landfill facility includes a disaster debris area, the closed
MSW and C&D landfills, the transfer station and scalehouse. The site is primarily
surrounded by rural-residential and agriculture. Presently, the local law enforcement
community utilizes a portion of the property as a firing range. The site location is shown
on Figure 1 and site details are shown on Figure 2.
1.4.1 Site Geology
The site is located on Late Proterozoic to Early Paleozoic metavolcanic rock of
the Carolina slate belt in the Piedmont physiographic province. Site topography
ranges from 570 to 650 feet above mean sea level (amsl) with the lower
elevations located along the unnamed tributaries of Mayo Creek.

Person County is located in the Carolina Terrain of the Piedmont Physiographic
Province. The Carolina Slate Belt and Eastern Slate Belt of the Carolina Terrain
underlie most of the county. Formations in this area are generally Late
Proterozoic to Early Paleozoic metavolcanic rock.2

The site is located west of the Nutbrush Creek Fault in the northern portion of
the Carolina Slate Belt. The formations found in this area are generally volcanic
and sedimentary rock, deposited in a shallow marine environment,
metamorphosed to lower greenschist facies and intruded by plutons. According
to Geology of the Carolinas, 1991, the site is underlain by the Roxboro
granodiorite; a batholith size pluton that intrudes the Virgilina Synclinorium, the
primary feature in the northern portion of the Carolina Slate belt, on the western
side.3 Sediments under the facility are generally well drained loam and sandy
loam.4
1.4.2 Local Groundwater Regime
The site is bounded by Mayo Creek and its unnamed tributaries. Mayo Creek
runs along the eastern border with unnamed tributaries along the southern
border and transecting the site. Multiple ponds are present east and west of the

2 Generalized Geologic Map of North Carolina, NC Geological Survey, 1991.
3 Butler, J.Robert, & Secor, Donald T. Jr. “The Central Piedmont”. The Geology of the Carolinas 1991. Horton & Zullo,
University of Tennessee Press.
4 USDA Web Soil Survey. http://websoilsurvey.nrcs.usda.gov/app/HomePage.htm

Person County Landfill Landfill Gas Monitoring Plan
November 2016 Page 4
property. One unnamed tributary is perennial and the other is intermittent. The
facility location is shown on Figure 1.

The uppermost aquifer at the site appears to exhibit mostly lateral flow with
potentiometric surfaces that reflect a subdued expression of the surface
topography. The groundwater likely flows towards the primary local drainage
features of Mayo creek and its unnamed tributaries located generally east and
south of the site.

Person County Landfill Landfill Gas Monitoring Plan
November 2016 Page 5
2.0 MONITORING PROGRAM
Currently landfill gas at the site is monitored monthly at 3 well locations (LFG-1, LFG-2 and
LFG-3) and 7 structures (S-1 through S-7). The plan contained herein includes the continued
program to monitor for subsurface landfill gas migration as well as landfill gas monitoring in
structures both on-site and on the adjoining western property.
2.1 Monitoring Points
The landfill property is bounded to the east by Mayo Creek and to the south by an
unnamed tributary to Mayo Creek. An additional unnamed tributary of Mayo Creek
bisects the site. The western property border is bounded by undeveloped land and
agriculture. Cedar Grove Church Road bounds the facility to the north. Surface water
locations and sensitive receptors were considered when evaluating potential landfill gas
monitoring points.

Existing monitoring locations are shown on Figure 1. No additional monitoring locations
are proposed at this time.
2.2 Facility Structure Monitoring
Occupied structures on the property and western adjoining property will be monitored.
The following facility structures will be monitored:

 Scalehouse;
 Maintenance Building and
 Firing Range Structure.

The following adjoining property structures will be monitored:

 Trailer house ~ 115’ W property boundary
 Storage Shed ~ 165’W property boundary
 Storage Shed – 180’W property boundary
 Trailer House ~400’W property boundary

If desired, a dedicated methane monitor may be installed within one or more of these
structures. Otherwise, monitoring will be conducted monthly with the landfill gas
monitoring points.
2.3 Remedial Strategy
A LFG trench was installed in 2013 along the western property boundary as a remedial
action, based on results from the initial investigation that indicated the 100% LEL
threshold was exceeded. The trench was installed to approximately 12 feet bgs and
approximately 200 feet in length. Every 100 feet a 6 inch stickup with a vented cap was
installed. The trench was designed to create a preferential pathway for gas flow,

Person County Landfill Landfill Gas Monitoring Plan
November 2016 Page 6
preventing it from traveling underground toward the Person County Closed Landfill
property line.

North of the proposed trench, two passive LFG vent wells were installed. PV-1 was
installed to 30ft bgs and PV-2 was installed to 19ft bgs. Both vent well locations were
completed with 6-inch diameter 20-slot per inch PVC pipe and solid PVC riser to the
surface, and an approximate ten foot stick-up with a 180 degree elbow at the top to
prevent rainfall infiltration.
2.3.1 Proposed Remedial Strategy
Additional LFG corrective action is warranted due to continued 100% LEL
threshold exceedance in LFG-1 and LFG-2. Conversion of the existing passive
vent system into an active blower system is proposed. Power will be supplied off
Brann Road by Piedmont Electric. The existing vent trench and vent wells will be
converted into an active system. The current 6-inch PVC trench vents will be
capped off, and connected to the blower at the northern edge of the trench via a
valve and header pipe. The valves will allow focused recovery in areas of the
trench exhibiting the greatest LFG migration. The passive vent wells will also be
connected to a header pipe and connected to the blower system. A concrete pad
will be constructed for the blower system. The pad and system will be installed
after electrical service is established.
2.4 Monitoring and Reporting
Monitoring and reporting of LFG concentrations will be performed in accordance with
guidance by the Division of Waste Management document “Methane Monitoring
Guidance” (www.wastenotnc.org/swhome/met_mon.html) and as outlined below.
2.4.1 Frequency
LFG monitoring will be conducted monthly to monitor current gas levels at the
property boundary. Modifications to monitoring frequency will be obtained from
the SWS as %LEL decreases at the property boundary. A minimum quarterly
monitoring will be conducted to ensure that landfill gas does not exceed the
lower explosive limit (LEL) at the facility property boundary and 25% LEL at
facility structures.

If methane readings exceed the specified limits, protection of human health is
the primary objective. Please follow the actions specified in Section 2.4.2.
2.4.2 Personnel
LFG monitoring will be performed by personnel who are familiar with the
requirements of this plan and who are trained in LFG hazards and explosive gas

Person County Landfill Landfill Gas Monitoring Plan
November 2016 Page 7
meter use. As practical, a designated technician will be assigned to regular LFG
monitoring duty.
2.4.3 Equipment
Person County will utilize a landfill gas instrument that meets the DWM Landfill
Gas Monitoring Guidance requirements for methane, oxygen and carbon dioxide.
Calibration will occur prior to instrument use in compliance with manufacturer’s
specifications
2.4.4 Procedures
Prior to each monitoring event, the portable gas analyzer will be calibrated with a
known calibration standard in accordance with manufacturer’s
recommendations. General information related to the monitoring event,
equipment used, calibration procedures, weather conditions, and results for
each monitoring event will be recorded on the landfill gas monitoring data form
(Appendix A).

The following steps outline the procedure for the monitoring of LFG wells and
facility structures:

 Check calibration date on the meter and calibrate according to
manufacturer’s instructions; allowing equipment to warm up properly
prior to use, per manufacturers direction.
 Purge sample tube for one minute before monitoring.

LFG Monitoring Points:
o Connect instrument to tubing sample port on the monitoring well
without removing the cap.
o Open the valve and record both the initial and stabilized methane
concentrations. A stabilized concentration will not vary more than
0.5 percent by volume on the instrument’s scale. Also record the
oxygen concentration (at two percent per volume or less to
indicate air is not being drawn into the system and providing false
readings) and the carbon dioxide concentration.
o Close the valve and disconnect the tubing.
o Record monitoring data on the LFG monitoring data form provided
in Appendix A.
o If any methane concentration is greater than 50% of the LEL
(2.5% CH4), monitoring personnel should implement the
Precautionary Action Plan (Section 2.3.5).
o If both initial and stabilized methane concentrations are less than
50% of the LEL (2.5% CH4), move to next LFG monitoring location.
o If any hydrogen sulfide concentration is greater than 4%,
monitoring personnel should, immediately recalibrate and re-

Person County Landfill Landfill Gas Monitoring Plan
November 2016 Page 8
measure the location. If the concentration is still above 4%, notify
the Landfill Manager and the Engineer.

Structures:
o Walk through the facility structure with a methane analyzer and
monitor the perimeter wall interface of the structure, the floor to
wall interface in hallways and rooms, and any floor penetrations in
the structure. Record the initial and stabilized methane
concentrations, oxygen concentration, and carbon dioxide
concentration.
o Record monitoring data on the LFG monitoring data form provided
in Appendix A.
o Notify the Landfill Manager, Operations Manager and the Engineer
for any methane concentration greater than 0% of the LEL.

IF A STABILIZED METHANE CONCENTRATION IS GREATER THAN 100% OF
THE LEL IN A LFG MONITORING WELL OR GREATER THAN 25% OF THE LEL
IN A FACILITY STRUCTURE, THE FOLLOWING ACTIONS WILL BE
IMPLEMENTED:

1) Recalibrate monitoring equipment and confirm results.
2) If results are confirmed, IMMEDIATELY contact the Landfill Manager and
the Engineer.
3) Implement the Compliance Action Plan located in Section 3.1.
2.4.5 Precautionary Action Plan
If an initial or stabilized methane concentration is greater than or equal to 50% of
the LEL in a LFG monitoring well, monitoring personnel should perform the
following additional steps at this location:

 Record at least one additional methane concentration measurement,
from the well location.
 Evaluate the surrounding area for potential receptors to or signs of LFG
migration. LFG can stress vegetation and can kill trees and grass by root
asphyxiation. Note stressed/dead vegetation areas on the monitoring
form.
 Notify the Landfill Manager and the Engineer for further evaluation.
2.4.6 Record Keeping
Routine LFG monitoring events will be documented on the LFG monitoring data
form provided in Appendix A. Completed forms will be placed in the landfill
operating record. These forms will be available for review by DWM personnel on
request.

Person County Landfill Landfill Gas Monitoring Plan
November 2016 Page 9
Documentation of any contingency plan actions (Section 3.0) will also be kept in
the operating record.
2.5 Maintenance
Periodic maintenance and site observations will be conducted routinely to address
monitoring program components (at a minimum):

 Maintain access to LFG monitoring locations.
 Observe landfill cover conditions, areas of dead vegetation, leachate seeps,
odors, etc. as indications of potential LFG-related problems.

Note deficiencies on the monitoring forms and report to the Solid Waste Operations
Manager for repair or replacement as necessary.

Person County Landfill Landfill Gas Monitoring Plan
November 2016 Page 10
3.0 CONTINGENCY PLAN
If a stabilized methane concentration is greater than 100% of the LEL in a LFG monitoring
location or greater than 25% of the LEL in a facility structure, the technician will perform
the actions presented in the immediate action, and plan and prepare a remediation plan as
described below.
3.1 Immediate Action Plan
The Solid Waste Operations Manager will perform the following actions for the
protection of human health and safety:

1) Evacuate affected facility structures and the immediately surrounding area.
2) Determine nearby potential receptors (facility and off-site structures).
3) Perform monitoring in any other facility structure near the monitoring location
having the high concentration.
4) If exceedances are noted in a facility structure, Contact the County Fire
Department (911).
5) Verbally notify the Landfill Manager.
6) Verbally notify the NCDEQ DWM (Section 1.1) as soon as practical.
7) Investigate and identify the potential source(s) and conduit(s) for LFG migration
that may have caused the high concentration (i.e. the migration path that the LFG
may be following to the monitoring location).
8) Identify the LFG extent using additional wells, barhole punch sampling
methodology or other applicable alternative methods as practical.
9) As appropriate, begin corrective action to control methane concentrations in
structures surrounding the landfill site.
3.1.1 Reporting and Documentation
Within seven days of the detection of a high methane concentration, the Facility
will prepare and submit an Environmental Monitoring Reporting Form (Appendix
A) with the results of the monitoring event to the DWM. The Facility will also
place a description of the actions performed to protect human health in the
operating record.
3.2 Remediation Plan
Within sixty days of the detection of a high methane concentration, a remediation plan
describing the problem nature, extent, and proposed remedy will be submitted to
NCDEQ for approval. Following approval the plan will be implemented and a copy will be
placed in the operating record. The DWM will also be notified the plan has been
implemented.

An extension may be granted by the DWM on written request and depending on severity
of the situation.

Figures

Landfill Gas Monitoring Plan
Person County Landfill
Roxboro, North Carolina

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MW-1
MW-4
MW-2
MW-5
MW-3
MW-6
LFG-3
LFG-2
LFG-1
PV-1
PV-2
GTV
GTV
GTV
S-1S-2
S-3
S-4
S-5 S-6S-7
0 300'600'
LEGEND:
CLOSED
MSW DISPOSAL
AREA
C&D
DISPOSAL
AREA
LFG-1
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MW-1
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Appendix A
Reporting Forms
Landfill Gas Monitoring Plan
Person County Landfill
Roxboro, North Carolina

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16 

NC Division of Waste Management - Solid Waste Section

Landfill Gas Monitoring Data Form

Notice: This form and any information attached to it are "Public Records" as defined in NC General Statute 132-1. As such,
these documents are available for inspection and examination by any person upon request (NC General Statute 132-6).

Facility Name: ______________________________________________ Permit Number: ____________________________

Date of Sampling: ___________________ NC Landfill Rule (.0500 or .1600): _____________________________________

Name and Position of Sample Collector: _________________________________________

Type and Serial Number of Gas Meter: _______________________________ Calibration Date of Gas Meter: ___________

Date and Time of Field Calibration: _____________________

Type of Field Calibration Gas (15/15 or 35/50): ____________ Expiration Date of Field Calibration Gas Canister: ________

Pump Rate of Gas Meter: _____________

Ambient Air Temperature: __________ Barometric Pressure: ______________ General Weather Conditions: _____________

Instructions: Under “Location or LFG Well” identify the monitoring wells or describe the location for other tests (e.g., inside
buildings). A drawing showing the location of test must be attached. Report methane readings in both % LEL and % methane
by volume. A reading in percent methane by volume can be converted to % LEL as follows: % methane by volume = %
LEL/20

If your facility has more gas monitoring locations than there is room on this form, please attach additional sheets listing the
same information as contained on this form.

Certification
To the best of my knowledge, the information reported and statements made on this data submittal and attachments
are true and correct. I am aware that there are significant penalties for making any false statement, representation, or
certification including the possibility of a fine and imprisonment.

_________________________________________ _________________________________________
SIGNATURE TITLE