3001_DavieMSW_LFGMonitoringPlan_DIN27857_20170530

Landfill Gas Monitoring Plan
Davie County MSW Landfill (Permit # 30-01)
Davie County C&D Landfill (Permit # 30-03)
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
Prepared for:
Davie County
298 E. Depot Street, Suite 200
Mocksville, NC 27028
Prepared by:
S&ME, Inc.
8646 W Market Street, Suite 105
Greensboro, North Carolina 27409
May 30, 2017
S&ME, Inc. | 8646 W Market St, Ste 105 | Greensboro, NC 27409 | p 336.288.7180 | f 336.288.8980 | www.smeinc.com
May 30, 2017
Davie County
298 E. Depot Street, Suite 200
Mocksville, NC 27028
Attention:Mr. Johnny Lambert, Utilities Director
Reference:Landfill Gas Monitoring Plan
Davie County Landfills
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
Dear Mr. Lambert:
S&ME, Inc. (S&ME), presents this Monitoring Plan for Landfill Gas at the closed Davie County Municipal
Solid Waste (MSW) Landfill and closed Construction and Demolition (C&D) Landfill. This Monitoring Plan
was prepared for regulatory compliance and it addresses the action required by the March 24, 2017,
Notice of Deficiency letter from the North Carolina Department of Environmental Quality, Waste
Management Division, Solid Waste Section (NCDEQ). This Monitoring Plan shall be submitted to the
NCDEQ for review and approval. Davie County must implement this Monitoring Plan following receipt of
NCDEQ approval.
If you should have any questions or need additional information please contact Edmund Q.B. Henriques at
(336)-312-3330.
Sincerely,
S&ME, Inc.
Edmund Q.B. Henriques, L.G.David R. Loftis, P.E.
Senior Geologist/Project Manager Senior Engineer
[e-mail] [e-mail]
Phone [phone] (cell)Phone [phone] (cell)
Landfill Gas Monitoring Plan
Davie County Landfills
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
May 30, 2017 ii
Table of Contents
1.0 Monitoring Plan Administration .......................................................................1
1.1 Purpose ..............................................................................................................................1
1.2 Location and Availability of Monitoring Plan..............................................................1
1.3 Monitoring Plan Review..................................................................................................1
2.0 Facility Description...............................................................................................1
2.1 Location..............................................................................................................................1
2.2 Landfill Operations ..........................................................................................................2
2.3 Existing Landfill Gas Vents and Methane Monitoring Wells.....................................2
2.4 General Site Information .................................................................................................2
2.4.1 Physiographic Setting .........................................................................................................2
2.4.2 Structures Located At The Facility and On Nearby Properties..........................................4
3.0 Methane Monitoring Program............................................................................6
3.1 General Requirements......................................................................................................6
3.2 Monitoring Locations.......................................................................................................6
3.3 Monitoring Frequency and Procedures.........................................................................7
3.4 Reporting...........................................................................................................................8
4.0 Contingency Plan ..................................................................................................8
5.0 Certification Of Professional Geologist ...........................................................9
Appendices
Appendix I – Figures
Appendix II – Methane Monitoring Well Design (Proposed)
Appendix III – Landfill Gas Monitoring Data Forms & Environmental Reporting Form
Landfill Gas Monitoring Plan
Davie County Landfills
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
May 30, 2017 1
1.0 Monitoring Plan Administration
The following sections detail the purpose and requirements of the Monitoring Plan.
1.1 Purpose
This Monitoring Plan for Landfill Gas is presented to provide the necessary requirements as specified in
Solid Waste Management Rules, Sections 0.544(d) and .1626. These rules present criteria for explosive gas
control as it relates to requirements for Municipal Solid Waste (MSW) landfill facilities. 15A NCAC
13B.1626 (4) (a) states: “Owners or operators of all MSWLF units must ensure that: (a) the concentration of
methane gas generated by the facility does not exceed 25 percent of the lower explosive limit for
methane in facility structures (excluding gas control or recovery system components; and (b) the
concentration of methane gas does not exceed the lower explosive limit for methane at the facility
property boundary.”
The purpose of this Monitoring Plan is to establish the recommended procedures and methods to
perform landfill gas monitoring at the closed Davie County MSW & C&D landfills. The methane gas
monitoring program shall be implemented to detect possible migration of methane gas off-site from the
landfill. Included in this program is the methane monitoring system, methane gas monitoring well
locations, methane monitoring procedures, sampling frequency, reporting requirements, and contingency
plan.
1.2 Location and Availability of Monitoring Plan
A complete copy of this Monitoring Plan will be maintained in the office of the Davie County, Utilities
Director. This Monitoring Plan will remain on-site in the former Scale House building and be made
available to NCDEQ for inspection.
1.3 Monitoring Plan Review
The Davie County Solid Waste Department will review and update this Monitoring Plan as needed to
reflect changes in methodology, monitoring, facility modifications, or as directed by the NCDEQ. The
Davie County will make the needed revisions to the Monitoring Plan and implement the changes as soon
as practical following an amendment.
2.0 Facility Description
The following sections describe the facility and past and present operations on site.
2.1 Location
The Davie County Landfill is owned and operated by Davie County and is located approximately 2.5 miles
southeast of downtown Mocksville in the central part of Davie County. The physical address of the landfill
is 360 Dalton Road, Mocksville, North Carolina 27028. The facility location is illustrated on Figure 1.
Landfill Gas Monitoring Plan
Davie County Landfills
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
May 30, 2017 2
2.2 Landfill Operations
The Davie County Landfill site consists of the closed MSW landfill & the closed C&D landfill.
Records reviewed by S&ME indicate that the Davie County MSW landfills consisted of four Phases. Phase
I and Phase II, situated east of the permitted MSW landfill (Permit No. 30-01) were Pre-Regulatory
landfills; which are currently managed by the NCDEQ, and they are excludes from this Plan. The Pre-
Regulatory Landfill units are reportedly referred by the NCDEQ as the Dalton Refuse Dump,
NONCD0000279. The permitted Davie County MSW landfill units addressed by this Monitoring Plan
reportedly consist of the following two phases:
♦Phase III, closed in 1990
♦Phase IV, closed in 1994
The closed Davie County MSW Landfill, Phases III and, IV are unlined landfills. Although detailed written
records of the landfill operation have not be discovered, landfill was reported to predominantly consist of
multiple trench style structures. Phase IV operations reported ceased sometime prior to October 6, 1993.
Based on historical closure design drawings prepared by DS Atlantic, dated October 7, 1993, Phase IV was
to be “closed-out” with approximately 18 inches of a soil barrier material with a conductivity of
approximately 10
-5 centimeters/second placed over the waste, overlain by approximately six-inches of
topsoil (erosion layer) on top of the landfill. Specific closure methods for other phases were not
discovered.
The C&D Landfill (Permit # 30-03) is located north of the closed and permitted MSW Landfill units. The
C&D Landfill was closed in 2003.
Currently, under contract with Davie County, Republic Services utilizes the portions of the facility near
Dalton road as a solid waste convenience site for County residents. The landfilled property is illustrated
on Figure 2.
2.3 Existing Landfill Gas Vents and Methane Monitoring Wells
The subject Davie County MSW Landfill units and C&D Landfill do not have gas venting systems.
It is recognized that peak production of landfill gas typically occurs within 5-7 years following the burial of
waste; therefore, gas production for the MSW landfill has most likely diminished substantially following
approximately 23 years of landfill closure. C&D landfills typically contain non-hazardous materials such as
wood, sheet rock, gypsum board, concrete, bricks, and paving materials. When compared with MSW
landfills, they are less significant sources of landfill gas generation due to the waste being composed of a
lower percentage of organic wastes.
2.4 General Site Information
2.4.1 Physiographic Setting
According to the Geologic Map of North Carolina, Region 8, by P. Albert Carpenter, dated 1982; the
landfill and vicinity are underlain by metamorphosed rocks of the Charlotte belt, described as granitic
Landfill Gas Monitoring Plan
Davie County Landfills
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
May 30, 2017 3
gneiss. The depth to groundwater at the Davie County Landfill site can be gauged from static water levels
obtained from the compliance groundwater monitoring network. The uppermost prevalent groundwater
aquifer across the site is typically encountered in the shallow partially weathered bedrock (granitic gneiss)
near the soil-bedrock interface. The primary component of groundwater flow is along fracture networks
and joint systems within the partially weathered bedrock. Based on static water level data obtained from
the compliance groundwater monitoring network, the direction of groundwater flow across the site is
toward the west and northwest.
According to the Soil Survey of Davie County North Carolina, the soils within the landfill area are classified
as Udorthents, soil which has been altered by excavation or covered by earthy fill material. The following
summarizes the soil series for natural soils adjacent to the landfill.
♦The natural soils to the west and northwest of the landfill area are classified as Pacolet sandy clay
loam which consists mainly of well drained Pacolet and similar soils on ridges in the uplands. The
soil is moderately eroded, and in most places tillage has mixed subsoil material into the remaining
original surface layer. Typically, the surface layer is a yellowish red sandy clay loam 7 inches thick.
The subsoil is 29 inches thick. The upper part is red clay loam. The next part is red clay that has
reddish yellow mottles. The lower part is red sandy clay loam with reddish yellow mottles. The
underlying material to a depth of 60 inches is red and yellowish red saprolite that has a texture of
sandy loam. Water and air move through this soil at a moderate rate and the shrink-swell
potential is low.
♦The soils to the south and northeast of the landfill area are classified as Rion sandy loam which
consists mainly of well drained Rion and similar soils on the side slopes in the uplands throughout
the County. Typically, two inches of fresh and decomposed hardwood litter is on the surface. The
surface layer is a yellowish brown sandy loam that is six inches thick. The subsurface layer is light
yellowish brown sandy loam and is also six inches thick. The subsoil is 20 inches thick. The upper
part is reddish yellow clay loam. The lower part is brownish yellow sandy loam with very pale
brown and light yellowish brown mottles. The underlying material to a depth of 60 inches is
mottled brownish yellow, very pale brown, and light yellowish brown saprolite that has a texture
of sandy loam. Water and air move through this soil at a moderate rate and the shrink-swell
potential is low.
♦The soils to the east of the landfill area are classified as Wedowee sandy loam which consists
mainly of well drained Wedowee and similar soils on moderately broad to narrow ridges in the
uplands. Typically, the surface layer is a dark yellowish brown sandy loam that is 12 inches thick.
The subsoil is 23 inches thick. The upper part is yellowish red clay with red mottles. The lower
part is strong brown clay loam with red and yellow mottles. The underlying material to a depth of
60 inches is mottled strong brown, red and yellow saprolite that has a texture of sandy loam.
Water and air move through this soil at a moderate rate and the shrink-swell potential is
moderate.
The Davie County Landfill site is situated atop a topographic high with elevations ranging from
approximately 780 feet at the top of the waste management units to approximately 670 feet along the
banks of Leonard Creek which flows along the western boundary of the MSW disposal area and the
northern boundary of the C&D Landfill. Leonard Creek is expected to act as a natural barrier to the
subsurface migration of landfill gases away from the landfill units. Two Pre-regulatory landfill units are
situated between the east side of the MSW landfill and Dalton Road. Shallow incised valleys/drains cut
across the topography surrounding the waste management units.
Landfill Gas Monitoring Plan
Davie County Landfills
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
May 30, 2017 4
Surficial runoff from the MSW landfill is expected to follow a localized radial flow pattern from the waste
management units toward the shallow incised valleys around the site. As with the surface runoff, localized
groundwater flow paths are expected to follow a similar radial pattern away from the waste management
units toward the shallow incised valleys around the site.
As depicted on Figure 2, the closed MSW Landfill waste disposal units are located east of Leonard Creek
and west of an unnamed tributary to Leonard Creek.
2.4.2 Structures Located At The Facility and On Nearby Properties
The following provides a list and description of the buildings on the property:
♦The former scale house building, is a wood frame building that is currently used as bathroom
facilities for site workers.
♦A small skid mounted shed office building used by Republic Services. This building does not have
a crawlspace or formal foundation and rests directly on the pavement system.
♦An unoccupied metal storage building (former Landfill Administration Building), constructed slab
on grade, and
♦The former transfer station building is a metal construction, open air shed style building with a
small unused bathroom space and separate mechanical room. This building is vacant and not
used by the County or Waste Management.
The surrounding area can be described as rural. The closest off-site structures are associated with the
Davie County Firing range, which adjoins the facility to the south. Several widely spaced residential
homes are located on the opposite side (east) of Dalton Road. The nearest residential homes to the north
northwest of the MSW landfill approximately 1800 feet away and on the opposite side of Leonard Creek.
Based on compliance groundwater monitoring data, depths to groundwater around the MSW landfill and
the C&D Landfill were observed to be as follows on May 2, 2017.
Landfill Gas Monitoring Plan
Davie County Landfills
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
May 30, 2017 5
Table 2-1
C&D Landfill Monitoring Wells
Well ID
Total Depth
(Ft. below TOC)
Screen Interval
(Ft. below TOC)
Depth to
Groundwater
(Ft. below TOC)
TOC (Ft.
above GS)Comments
MW-6 15.5 Unknown*5.94 2.5 Compliance
MW-7 20.6 Unknown*13.97 2.5 Compliance
MW-8A 32.7 17.7-32.7 16.75 2.7 Compliance
MW-9 15.9 Unknown*11.87 2.5 Compliance
MW-20 50.4 25.43-50.4 32.6 2.4 Compliance
Table 2-2
MSW Landfill Monitoring Wells
Well ID
Total Depth
(ft. below TOC)
Screen Interval
(ft. below TOC)
Depth to
Groundwater
(Ft. below TOC)
TOC
Height (Ft.
above GS)Comments
MW-2 22.10 Unknown*5.24 1 Compliance
MW-3 36.71 Unknown*11.44 1 Compliance
MW-4 30.30 Unknown*9.88 2 Compliance
MW-13A 50.1 30.1 – 50.1 35.42 3.1 Background
MW-16S 17.4 7.4-17.4 13.52 2.4 Compliance /
NES
MW-16D 58.65 53.65 – 58.65 13.61 3.0 Compliance /
NES
MW-17 61.4 42.4 – 61.4 50.65 2.3 Compliance /
NES
MW-18 41.1 25.1 – 41.1 26.88 4.45 Compliance /
NES
MW-19S 17.5 7.5. – 17.5 6.59 2.5 NES
MW-19D 73.4 63.4 - 73.4 4.83 3.4 NES
MW-21 22.00 7.00 – 22.00 4.01 2.0 NES
MW-22 49.9 39.9 – 49.9 4.99 3.9 NES
TOC = Top of Casing
GS = Ground Surface
NES = Nature & Extent Study Monitoring Well
Unknown* = No well records available to document screen intervals
Groundwater is relatively shallow in the vicinity of the Leonard Creek as indicated by water levels observed
at groundwater monitoring wells MW-2, MW-5, and MW-6. Groundwater occurrence is relatively deeper
in the upland landscape positions represented by groundwater monitoring well MW-5A, MW-15, MW-
MW-17, MW-12, and MW-20. Monitoring well locations are depicted on Figure 2.
Landfill Gas Monitoring Plan
Davie County Landfills
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
May 30, 2017 6
3.0 Methane Monitoring Program
The following sections detail general requirements, procedures, and frequency of the monitoring
program.
3.1 General Requirements
The general requirements of the methane monitoring program are to establish methane gas monitoring
locations and protocols that assess methane concentrations at the property boundaries, on-site
structures, and off site residences and structures adjacent to the landfill. The methane monitoring
program is designed to address the following facility requirements:
♦The concentration of methane gas or other explosive gases generated by the facility does not
exceed 25 percent of the lower explosive limit (LEL) in on-site facility structures (excluding gas
control or recovery system components);
♦The concentration of methane gas or other explosive gases does not exceed the LEL for methane
or other explosive gases at the facility property boundary; and
♦The facility does not release methane gas or other explosive gases in any concentration that can
be detected in off-site structures.
3.2 Monitoring Locations
This plan includes two landfill gas monitoring wells to be installed and utilized to monitor methane gas
for the facility. These methane gas monitor wells will be positioned to detect methane gas that may
migrate into the structures located beyond the landfill property boundary. The wells will be located
between the waste boundary and the property boundary.
The following table provides a description of each location and its function:
Table 3-1
Proposed Landfill Gas Monitoring Locations
Location ID Type Function Comments
LFG-1 Gas Monitoring Well Property Line Monitoring MSW Permit 30-01
LFG-2 Gas Monitoring Well Property Line Monitoring C&D Permit 30-03
LFG-3 Former Scale House Structure Monitoring MSW Landfills 30-01
LGG-4 Former Admin Building Structure Monitoring MSW Landfills
Landfill methane gas monitoring well LFG-1 to be located in the vicinity of the convenience site entrance,
placing it between the south side of the landfill and the adjacent Davie Law Enforcement Center shooting
range building. Landfill methane gas monitoring well LFG-2 to be located to the east of the C&D landfill,
east of monitoring well MW-8, at a location behind the property boundary. It should be noted that
Leonard Creek and its’ tributaries generally follows the property line and as a local discharge point, with
pores saturated with water, it should act as a natural barrier to landfill gas migration. Therefore,
additional landfill gas monitoring wells are not necessary at the property boundary in areas west of the
MSW and C&D landfills, along with to the north of the C&D landfill. Furthermore, methane gas
monitoring wells for the subject landfills are not proposed to the east of the MSW landfill due to the
Landfill Gas Monitoring Plan
Davie County Landfills
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
May 30, 2017 7
existence of the Pre-Regulatory Landfill units in this area.Figure 2 depicts the landfill gas monitoring
locations.Appendix II includes diagrams depicting approximate well construction details for the landfill
gas monitoring points.
The former landfill scale house (location ID = LFG-3) utilized by Republic Services for the solid waste
convenience site and the unoccupied form landfill administration building (location ID = LFG-4), now used
for storage shall also be monitored quarterly. A continuous methane gas monitor with alarm will not be
utilized. However, ambient conditions inside these buildings will be monitored utilizing the same field
instrument used to obtain field measurements from the landfill gas monitoring wells. Based on the
approximate 23 years that have passed since waste was last placed in the closed MSW landfill, continuous
monitoring of on-site structures should not be necessary. However, if methane concentrations are
measured near the property boundary at LFG-1 and LFG-2 that exceed the lower explosive limit then the
structure will be monitored in accordance with the Contingency Plan detailed in Section 4.
3.3 Monitoring Frequency and Procedures
Monitoring of the methane monitoring wells will be conducted quarterly unless directed otherwise by the
NCDEQ. Methane monitoring within the former scale house building will be performed quarterly.
Monitoring of the headspace gas in the methane monitoring wells will be performed by trained personnel
using a GEM portable gas analyzer fitted with a Swagelock quick connect assembly or a stopcock type
valve. The GEM portable gas analyzer will be calibrated prior to field measurements in general accordance
with the manufacture’s recommendations. The following procedures will be used to collect landfill gas
measurements in the methane monitoring wells:
1.Record the ambient temperature, barometric pressure, and general weather conditions at the
facility on the day of data collection.
2.Unlock the protective casing for the methane well and open the protective casing lid to expose
the methane well.
3.Connect the GEM portable gas meter to the methane well using the quick connections or
stopcock valve. If quick connections are used, make sure the quick connections are seated
properly, the user should hear and feel the male and female connections click into place.
4.Record the time of sample tube purging and the time (seconds) pumped for each sample
location.
5.Monitor percent methane (%CH4) in each well until the reading on the meter stabilizes.
6.Record initial and stabilized % LEL readings for each sample location. (LEL for methane is 5%
CH4).
7.The time of measurement, percent carbon dioxide (%CO2), and percent oxygen (%O2) will also be
recorded.
The gas in the facility structures will be measured by recording detected concentration until reading
stabilize, generally after approximately 3 to 5 minutes in each structure.
The Landfill Gas Monitoring Data Form presented in Appendix II will be used to record the readings from
the methane monitoring wells, structures, and additional details associated with each monitoring event.
Landfill Gas Monitoring Plan
Davie County Landfills
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
May 30, 2017 8
3.4 Reporting
The measurements collected from the methane monitoring wells will be recorded for each well for each
sampling event and a copy of the quarterly landfill gas monitoring results shall be placed in the Operating
Record of the facility and be readily available for review during landfill audits and inspection. The results
do not need to be reported to the NCDENR Solid Waste Section unless:
♦There is an explosive gas exceedance of the LEL at the facility property boundary as measured in
the landfill gas monitoring wells, or
♦There is an explosive gas exceedance of 25% LEL in facility structures.
Under either of these circumstances, an Environmental Monitoring Reporting Form together with the
Landfill Gas Monitoring Data Form, must be completed and submitted to the NCDEQ Solid Waste Section.
Copies of both forms are contained in Appendix III.
4.0 Contingency Plan
North Carolina regulations require that explosive gases be controlled such that concentrations of gases
will be less than 25 percent of the LEL in on-site structures and less than 100 percent of the LEL at the
facility property boundary.
If methane gas levels exceeding the maximum LEL are detected, the County will perform the following:
♦Immediately take steps necessary to ensure protection of human health and notify the Division;
♦Within seven days of detection, place in the landfill record the methane or explosive gas levels
detected and a description of the steps taken to protect human health; and
♦Within 60 days of detection, implement a remediation plan for the methane or explosive gas
releases, place a copy of the plan in the operating record, and notify the Division that the plan has
been implemented. The plan would describe the nature and extent of the problem and the
proposed remedy.
Figure 3 presents a flow chart summarizing methane monitoring requirements, and the necessary steps
the owner/operator must take if methane gas concentrations exceed the action levels in methane gas
monitoring wells or facility structures.
As a step to address the protection of human health, in the event that methane concentrations in LFG-1 or
LFG-2 exceed the LEL for methane, Davie County will begin methane monitoring of the off-site residential
structures adjacent to the well/wells. Procedures for residential monitoring are as follows:
♦Notify the adjacent property owners in writing of the potential for entrapped methane gas
beneath their dwellings and request permission to monitor for the presence of methane gas
within and around their home;
♦Once permission has been granted for monitoring, visually observe the home both inside and out
for potential areas where methane gas may become trapped (i.e. crawl spaces, basements, closets,
etc.); then
♦Monitor ambient methane concentrations inside and outside of the home, documenting locations
and measurements.
Landfill Gas Monitoring Plan
Davie County Landfills
Mocksville, North Carolina
S&ME Project No. 1584-03-109A
May 30, 2017 9
The Landfill Gas Monitoring Date Form presented in Appendix III shall be used to record the readings
from the residential monitoring.
If detectable concentrations of methane gas are measured within the residence, Davie County will
immediately take steps necessary to ensure protection of human health and notify the Division.
5.0 Certification Of Professional Geologist
The certification statement below must be signed and sealed by a North Carolina Professional Geologist
or Professional Engineer and submitted with the Landfill Gas Monitoring Plan.
The landfill gas monitoring plan for this facility has been prepared by a qualified geologist or engineer
who is licensed to practice in the State of North Carolina. The plan has been prepared based on first-
hand knowledge of site conditions and familiarity with North Carolina solid waste rules and industry
standard protocol. This certification is made in accordance with North Carolina Solid Waste Regulations,
indicating this Landfill Gas Monitoring Plan should provide early detection of landfill gas migration
1 so as
to be protective of public health and the environment. No other warranties, expressed or implied, are
made.
Signed _____________________________________________________
Printed ________Edmund Q.B. Henriques___________________
Date _________5/30/2017________________________
Not valid unless this document bears the seal of the above mentioned licensed professional.
1 Gas migration from the permitted C&D and MSW landfill units that are the subject of this PLAN.
Appendices
Appendix I – Figures
SITE LOCATION
DAVIE COUNTY LANDFILLDAVIE COUNTY, NORTH CAROLINA 1
1584-03-109
DDH
SCALE:
PROJECT NO:
DATE:
DRAWN BY:
FIGURE NO.
5-23-17
1 " = 2,000 '
Q :\1 5 8 4 \1 5 8 4 -0 3 -1 0 9 D a v i e C o . L a n d f i l l \1 _s i t e l o c a t i o n .m x d p l o t t e d b y D H o m a n s 0 5 -2 3 -2 0 1 7
³
LANDFILL PROPERY
0 2,000 4,000
(IN FEET)
1 " = 2 miles
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LFG-2(gas well, tobe installed)
LGF-1(gas well, tobe installed)
LFG-4(former adminbuilding)LFG-3(formerscale house)
DALTONRD
DALTON RD
F A
I
T H L N
N E W C A L V A R Y
C H U R C H W A Y
U
S

H
W
Y

6
4

E
U
S
H
W
Y
6
4
E
PHASE II
PHASE I
C&D LANDFILL
MSW LANDFILL(PHASESIII & IV)
Leonard Creek
7
8
0
7
4
0
7
2
0
8
2
0
8
0
0
7
8
0
7
4
0
7 2 0
7
6
0
7
4
0
7
4
0
7
2
0
7
0
0
6
8
0
7
6
0
7 0 0
6
8
0
7
6
0
7 6 0
7 6 0
740
7
4
0
7
0
0
7 0 0
700
740
MW- 20
MW- 19SPMW- 19D
MW- 21
MW- 18MW- 17
MW- 15
MW- 5
MW- 10
MW- 11
MW- 12
MW- 4
MW- 3
SW- 3
MW- 13
MW- 14
MW- 2B
SW- 2
SW- 1
SW- 4
MW- 8
MW- 7
MW- 9
MW- 6
MW- 1
MW- 22
MW- 16PMW16S
L A N D F I L L G A S M O N I T O R I N G L O C A T I O N
D A V I E C O U N T Y L A N D F I L L
D A V I E C O U N T Y , N O R T H C A R O L I N A
2
1 5 8 4 -0 3 -1 0 9 A
D D H
5 -2 5 -2 0 1 7
FIGURE NO.
S C A L E :
P R O J E C T N O .
D A T E :
D R A W N B Y :
³
1 " = 3 0 0 '
Q :\1 5 8 4 \1 5 8 4 -0 3 -1 0 9 D a v i e C o . L a n d f i l l \2 _L G m o n i t o r i n g p l a n .m x d p l o t t e d b y r c u c i n o t t a 0 5 -2 5 -2 0 1 7
Î"J EXISTING MONITORING WELLS
Ð!G LANDFILL GAS MONITORING LOCATION
LANDFILL PROPERTY
APPROXIMATE LIMITS OF WASTE:PERMITTED LANDFILL UNITS
APPROXIMATE LIMITS OF WASTE:PRE-REGULATORY LANDFILL UNITS
0 300 600
(IN FEET)
Monitoring frequency is
monthly.
Methane gas concentration must not exceed:
1. 25% of the LEL in facility structures; and
2. 100% of the LEL at the facility property boundary.
If the methane gas
concentration exceeds either
of the above, then the owner
must:
1. Immediately take all
steps necessary to
insure protection of
human health, and
2. Within 7 days:
place in the Operating
Record the methane
gas levels detected a
steps taken to prote
human health.
3. Within 60 days:
implement a
Remediation Plan, and
nd
ct
Immediately Notify the
Division.
Place a copy of the
Remediation Plan in the
Operating Record, and
Begin Residential
Monitoring Notify the Division that
the plan has been
implemented.

Figure No.
SCALE: NTS
CHECKED BY:
DRAWN BY: EQBH
DATE: MAY 2014
METHANE MONITORING REQUIREMENTS

WWW.SMEINC.COM 3Davie County Landfill
S&ME Project No. 1584-03-109A
Appendix II – Methane Monitoring Well Design (Proposed)
EXAMPLE GAS MONITORING WELL CONSTRUCTION*
*To be adjusted as appropriate based on actual subsurface conditions
WELL ID:TBD TOTAL DEPTH: ~ 25 ft bls
S&ME PROJECT AND NO:WELL USE / TYPE:INSTALLATION DATE:
Compliance
DRILLING CONTRACTOR:DRILLER AND LICENCE NO.:DRILLING METHOD:
WATER LEVEL AT TOB: NORTHING: EASTING:TOP OF CASING ELEV.:GROUND SURFACE ELEV.:
TBD
PAD TYPE:
PROTECTIVE CASING:
Depth BLS
0 ft - Top of Grout CASING TYPE:
CASING INTERVAL:
SCREEN TYPE:
SCREEN INTERVAL
GROUT TYPE:
GROUT INTERVAL
SEAL TYPE:
SEAL INTERVAL:
FILTER PACK:
FILTER PACK INTERVAL:
Screened DEVELOPMENT:
Interval
20 feet NOTES:
20 feet of screen to accommodate
likely seasonal water level changes
TBD - To Be Determined
bls = below land surface
0 - 5 feet bls
2-inch dia. PVC factory slotted 0.010 screen
5 ft - Top of Screen
ft bls - Total Depth
TBD
Stickup (ft): ~ 2.5 ft
2 ft - Top of Seal
4 ft - Top of Filter Pack
TBD
Hollow Stem Auger
TBD
concrete
post type well cover
2-inch diameter, PVC
TBD TBD
TBD
Davie County Landfill/ S&ME Project No. 1584-98-109A
TBD
25 ft - Bottom of Screen complete well above groundwater
5 - 25 feet bls
Portland
0 - 4 feet bls
bentonite
2 - 4 feet bls
#2 sand
4 - 25 feet bls
Appendix III – Landfill Gas Monitoring Data Forms &
Environmental Reporting Form
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