3901_Granville_OxfordClosurePlan_FID732198_20170517

PREPARED FOR: GRANVILLE COUNTY
141 WILLIAMSBORO STREET
OXFORD, NORTH CAROLINA 27565

OXFORD LANDFILL
GRANVILLE COUNTY, NORTH CAROLINA
PERMIT NO. 39-01
CLOSURE PLAN

JUNE 2008
REVISED NOVEMBER 2009
REVISED SEPTEMBER 2014
REVISED APRIL 2017

REVISED BY:

2211 WEST MEADOWVIEW ROAD SUITE 101 GREENSBORO, NORTH CAROLINA 27407
PHONE: [phone]
FAX: [phone] WWW.JOYCEENGINEERING.COM JEI PROJECT NO 00660.1302.12 T09 NORTH CAROLINA CORPORATE LIC: C-0782

Closure and Post-Closure Care Plan Joyce Engineering
Oxford C&D
Landfill Revised April 2017
Granville County, North Carolina

i
CLOSURE & POST-CLOSURE CARE PLAN

TABLE OF CONTENTS

1. GENERAL ..........................................................................................................................1 
2. CLOSURE ..........................................................................................................................1 
A. Description of Cap System ................................................................................................1 
B. Closure Area .......................................................................................................................2 
C. Waste Inventory .................................................................................................................2 
D. Schedule ..............................................................................................................................2 
E. Cost Estimate for Closure .................................................................................................3 
3. POST-CLOSURE ..............................................................................................................3 
A. Contact ................................................................................................................................3 
B. Security ...............................................................................................................................3 
C. Post-Closure Maintenance ................................................................................................3 
4. MONITORING PLAN ......................................................................................................4 
A. Inspection Plan ...................................................................................................................4 
B. Post-Closure Land Use ......................................................................................................4 
C. Post-Closure Cost Estimate ...............................................................................................5 
D. Post-Closure Record Keeping ...........................................................................................5 
E. Groundwater Monitoring Plan .........................................................................................5 
F. Surface Water Monitoring Plan .......................................................................................5 
G. Gas Control Plan ................................................................................................................5 
5. MAINTENANCE PLAN ...................................................................................................6 
A. Correction of Leachate Outbreaks ...................................................................................6 
6. CLOSURE/POST CLOSURE VERIFICATION ...........................................................6 

Closure and Post-Closure Care Plan Joyce Engineering
Oxford C&D
Landfill Revised April 2017
Granville County, North Carolina

ii
APPENDICES
Appendix 1 Waste Inventory Calculations (Deleted)
Appendix 2 Closure Cost Estimates
Appendix 3 Post-Closure Cost Estimates
Appendix 4 Post-Closure Inspection Record
Appendix 5 Groundwater Monitoring Well Maintenance Record
Appendix 6 Methane Monitoring Test Report
Appendix 7 Financial Assurance Documentation

DRAWINGS
Drawing FP-01 Facility Plan
Drawing CP-01 Closure Plan and Details
Drawing EC1 Erosion & Sedimentation Control Details

Drawing EC2 Erosion & Sedimentation Control Details

Note: Drawings EC1 and EC2 were prepared by G.N. Richardson & Associates, dated
December 2002. These drawings were taken from the Facility Revisions Application for a vertical expansion of the C&D landfill, which was approved on December 30, 2002. No changes
have been made to these drawings for this submittal. The drainage and erosion control measures
shown on CP-01 were taken from Drawings EC1 and EC2 of the same Application.

Closure and Post-Closure Care Plan Joyce Engineering
Oxford C&D
Landfill Revised April 2017
Granville County, North Carolina
1

1. GENERAL

The Granville County C&D Landfill is owned and operated by Granville County. The landfill is
operating under the State of North Carolina Department of environment and Natural Resources
(NC DENR) Permit No. 39-01 originally issued as a Municipal Solid Waste Landfill Facility. The
28.8-acre landfill stopped accepting MSW waste in December 1997, and a permit to operate a 9.4-
acre C&D landfill on top of the closed MSW was issued on December 30, 1997. The cohesive
soil closure cap for the closed MSW landfill was certified by Municipal Engineering in March
1999.

This closure and post-closure plan has been prepared in accordance with revised C&D landfill
regulations that apply to facilities which accept wastes after July 1, 2008 (15A NCAC 13B .0547).

2. CLOSURE

A. Description of Cap System

The cap system to be used is designed to minimize infiltration and erosion.

Cap System #1 will consist of (bottom to top):

 12 inch intermediate cover;
 A low-permeability infiltration layer of at least 18 inches with a permeability not
greater than 1.0 x 10-5 cm/sec; and
 A vegetative cover layer that contains a minimum of 18 inches of earthen material
that is capable of sustaining native plant growth.

Cap System #2

(for areas with slopes less than 8 percent) will consist of (bottom to top):

 12 inch intermediate cover
 Geosynthetic clay liner
 18 inch protective cover layer of earthen material
 A vegetative cover layer that contains a minimum of 6 inches of earthen material
that is capable of sustaining native plant growth.

(for areas with slopes greater than 8 percent) will consist of (bottom to top):

 12 inch intermediate cover
 18 inch protective cover layer of earthen material
 A vegetative cover layer that contains a minimum of 6 inches of earthen material
that is capable of sustaining native plant growth.

Closure and Post-Closure Care Plan Joyce Engineering
Oxford C&D
Landfill Revised April 2017
Granville County, North Carolina
2
Construction of the cap system will conform to the approved closure plans and the
following requirements:

 post-settlement surface slopes will be a minimum of five percent and 25 percent;
and
 gas venting or collection system will be installed below the low-permeability
barrier to minimize pressures exerted on the barrier.

B. Closure Area

The overall closure area of the C&D landfill is approximately 10.2 acres, approximately
9.4 acres of that being in the waste footprint and receiving the prescribed closure cap.
The remaining area is backfill grading.

C. Waste Inventory

The total tonnage in place at the end of operations is approximately 648,602 tons of
MSW waste and 267,391 tons of C&D waste.
D. Schedule

The landfill stopped receiving waste on December 31, 2016. Prior to beginning final
closure, Granville County will notify the Division that a notice of intent to close the facility
has been placed in the operating record. An itemized list of closure milestones and a
proposed schedule follow. Closure activities are proposed to begin within 30 days of final
receipt of waste. Construction of the closure cap is to be completed within 180 days
following the initiation of closure activities. The total length of the proposed closure period
is 210 days following the final receipt of waste.

Approximate closure milestones are shown below.

Proposed Closure Milestones and Schedule

Milestone Proposed Schedule from the Date of
Final Receipt of Waste Testing of borrow sources Within 6 months prior to closure
Grading of intermediate cover Within 30 to 60 days Placement of soil cap 30 to 150 days
Final inspection of cap by P.E. 150 to 180 days Construction of stormwater controls 90 to 180 days
Seeding and mulching 150 to 180 days Preparation of survey plat 180 to 210 days
Submittal of closure certification 180 to 210 days

Closure and Post-Closure Care Plan Joyce Engineering
Oxford C&D
Landfill Revised April 2017
Granville County, North Carolina
3

E. Cost Estimate for Closure

The closure cost estimate in 2017 dollars has been attached for the maximum area to be
closed.

3. POST-CLOSURE

Post-closure activities for the 28.8-acre closed MSW/C&D on-top landfill facility will be
conducted by Granville County for a period of 30 years following closure of the landfill. The
length of the period can be increased or decreased in accordance with Division directives.

A. Contact

Granville County will be responsible for answering questions and/or addressing problems
which might occur during the post-closure care period.

CONTACT PERSON: Mr. Jason Falls
Director, Environmental Programs

OWNER: Granville County, NC

ADDRESS: P.O. Box 906
Oxford, NC 27565

PHONE NUMBER: [phone]
FAX: [phone]

B. Security

Access to the site will be controlled by the use of barriers and gates at roadway entrances.
These control devices will be maintained throughout the post-closure care period, and
inspected as part of the monthly inspection program. All barriers and gates will be clearly
marked with signs stating the name and nature of the facility and the person to contact in
case of emergency or breach of security.

C. Post-Closure Maintenance

Post-closure maintenance and monitoring will be conducted at the landfill for a period of
30 years after final closure. The Division may decrease the length of the post-closure
period if the owner or operator demonstrates that the reduced period is sufficient to protect
human health and the environment, and the Division approves this demonstration. The
period might be increased by the Division if the Division determines that the lengthened
period is necessary to protect human health and the environment. Monitoring will include
semi-annual sampling of groundwater and surface water, quarterly gas monitoring, and
quarterly inspections of the final cover and monitoring and control systems. Maintenance
needs identified through the monitoring program will be initiated no later than 60 days after

Closure and Post-Closure Care Plan Joyce Engineering
Oxford C&D
Landfill Revised April 2017
Granville County, North Carolina
4
the discovery, and within 24 hours if a danger or eminent threat to human health or the
environment is indicated.

The cap system shall be maintained as necessary to correct the effects of settlement,
subsidence, erosion, or other events, and preventing run-on and run-off from eroding or
otherwise damaging the cap system. Small areas of cap maintenance (areas less that ¼
acre in size needing attention) may be deferred until there is a sufficient amount of work
to justify the mobilization of equipment and personnel. The vegetative cover shall be
mowed a minimum of once a year. The vegetative cover shall be amended and fertilized
as needed to maintain healthy vegetation. Depressions in the cover that pond water or
otherwise impair the function of the final cover will be filled and/or regraded. Areas
subject to regrading will be revegetated. Animal burrows and eroded areas should be filled
in with compacted soil and reseeded. If vegetative cover is not adequate in a particular
area, fertilizer should be applied and the area reseeded in order to re-establish vegetation.
Insecticides may be used to eliminate insect populations that are detrimental to the
vegetation. Any deep-rooted or woody vegetation that may have established itself on the
cover soil will be removed.

4. MONITORING PLAN

A. Inspection Plan

Routine inspections will be conducted throughout the post-closure care period. These
inspections will be carried out quarterly unless problems are detected that indicate that
more frequent visits are warranted. Potential impacts to the public and environment will
be considered in determining the inspection frequency. In addition, unscheduled
inspections will be conducted according to the approved Erosion and Sediment Control
Plan or after significant rainfall events to ensure BMPs are functioning and to check for
leachate seeps in side slopes. Items to be included in the periodic inspection will be as
follows:

 Access and security control
 Integrity of the final cover
 Stormwater management
 Leachate outbreaks
 Erosion and sediment control
 Gas management
 Groundwater and landfill gas monitoring systems
 Vector control
 Waste limit markers

B. Post-Closure Land Use

The primary land use for the site after closure of the landfill will be open dormant green
space in accordance with Rule .1629(c)(3).

Closure and Post-Closure Care Plan Joyce Engineering
Oxford C&D
Landfill Revised April 2017
Granville County, North Carolina
5
C. Post-Closure Cost Estimate

An estimate of post-closure care costs is attached. The total 30-year post-closure cost is
given in 2017 dollars.

D. Post-Closure Record Keeping

The County will maintain all Post Closure records in a location that will be determined
upon closure. The Division will be notified of the location for the documents. The
documents will be made available to the Division upon request.

E. Groundwater Monitoring Plan

Groundwater monitoring will continue under the approved plan for the facility.

F. Surface Water Monitoring Plan

Surface water monitoring will continue under the approved plan for the facility.

G. Gas Control Plan

To protect public health and safety in the vicinity of the landfill, gas produced by the
decomposition of refuse will be controlled and monitored during the operational, closure,
and post-closure periods. A gas management plan and gas monitoring program will be
implemented for the purpose of maintaining the concentration of methane gas below the
following regulatory levels:

 The concentration of methane gas generated is not to exceed 25 percent of the lower
explosive limit (LEL) for methane in on-site structures (excluding gas control or
recovery system components); and

 The concentration of methane gas is not to exceed the LEL for methane at the
facility property boundary.

The landfill gas management plan is currently proposed to include monitoring in
accordance with Rule .1627(d)(1)(D), and passive gas venting in the landfill. Other
remedial measures will be implemented as needed to mitigate a potential gas migration
problem.

General

Gas monitoring at the landfill will continue to be performed during the active life of the
landfill and throughout the post-closure care period. Quarterly monitoring will be
conducted at all subsurface gas detection probes and in all structures on the facility
property. Gas detection probes have been installed along the northern, eastern and western
waste boundary and are shown on Drawing No. FP-01.

Closure and Post-Closure Care Plan Joyce Engineering
Oxford C&D
Landfill Revised April 2017
Granville County, North Carolina
6
Upon final closure, passive landfill gas vents will be installed along with the final cover
system to allow release of gas to the atmosphere.

Record Keeping

The operator records the date, time, location, and sampling personnel, at the time of
sampling, in addition to the concentration of combustible gases. The records will be
maintained in the landfill operating record.

5. MAINTENANCE PLAN

A. Correction of Leachate Outbreaks

Site inspections will be performed to detect any problems from leachate seeps. Any surface
seeps will be carefully investigated before excavating and repairing the final cover in the
area of the seeps. Visual inspections shall be conducted in the near vicinity of the seeps to
determine if additional control or remedial actions are necessary.

Once a seep has been identified, the following procedures will be implemented as soon as
possible for leachate remediation:

First, all leachate-saturated cover soils will be removed and placed within the footprint of
the waste cell. The source of the seep will be exposed by excavation, then turned down
into the waste mass. The excavated area will be backfilled with stone, then covered with
clean, compacted soil in order to prevent infiltration and properly contain the underlying
waste materials. The soils selected for the new cover will have the lowest permeability of
the available materials, and will be placed to depths exceeding the minimum required 12”,
if necessary.

6. CLOSURE/POST CLOSURE VERIFICATION

The following procedures will be implemented following closure:

 Upon completion of closure, a licensed professional engineer acting on behalf of
the owner will submit a Certification of Closure to the Division. This Certification
will state that the site was closed in accordance with the Closure Plan and applicable
solid waste regulations and laws as required by Rule .1627(c)(7).

 Upon completion of the post-closure care period, the owner or operator will notify
the Division that a certificate has been placed in the operating record. The
certificate will be signed by a licensed professional engineer acting on behalf of the
owner and shall verify that post-closure care has been completed in accordance with
the Post Closure Care Plan and applicable solid waste regulations and laws as
required by Rule .1627(d)(3).

Closure and Post-Closure Care Plan Joyce Engineering
Oxford C&D
Landfill Revised April 2017
Granville County, North Carolina
7
 The owner must record a notation on the deed to the landfill facility property at
the local county Registrar of Deeds office, or some other instrument that is
normally examined during title search, and notify the division that the notation
has been recorded and a copy has been placed in the operating record. The
notation shall in perpetuity notify any potential purchaser of the property that the
land has been used as a C&DLF facility and its use is restricted under the closure
plan approved by the Division.

*END*
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i ~ 1. NO RESIDENTIAL WELLS ARE LOCATED WITHIN 500 FEET 1-----,f----+--+--+--+-+-t--=+----<
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2. NO PRIVATE RESIDENCES ARE LOCATED WITHIN 500 FEET
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4. TOPOGRAPHIC SURVEY FOR C&D LANDFILL CONSISTS
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PHASE 1 CAPACITY SURVEY DATED MAY 20, 2014.
6. SURROUNDING SURVEY OUTSIDE OF IMMEDIATE
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DATED MARCH 24, 2010.
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CAP SYSTEM #1 DETAIL
N.T.S.
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:=:=:=:=:=:=:=:=:=:=:s 12" INTERMEDIATE COVER :=:=:=:=:=:=:=:=:=:=:s ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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7 E(~2
APPENDIX 2
CLOSURE COST ESTIMATES
APPENDIX 2
CLOSURE COST ESTIMATES
OXFORD UNIT 1 Permit # 39-01
ITEM UNIT QUANTITY UNIT COST COST $
FINAL CAP SYSTEM- 9.4 ACRES
Infiltration Layer (18" low k soil) cy 22,748 $10.50 $238,854
Erosion Layer (18" local soil) cy 22,748 $7.00 $159,236
Erosion Layer (Backfill of local soil outside waste limits) cy 6,600 $7.00 $46,200
Subtotal $444,290
SEDIMENTATION AND EROSION CONTROLS
Diversion Berms/Drainage Benches
Construction lf 2,840 $9.59 $27,236
Slope Drains
Pipe and Installation lf 1,910 $45.49 $86,886
Miscellaneous
Outlet Protection (RipRap) each 4 $454.95 $1,820
Silt Fence lf 2,650 $3.78 $10,017
Subtotal $125,959
GAS CONTROLS (Vents)each 6 $5,000.00 $30,000
VEGETATIVE COVER acre 10.2 $1,750.00 $17,850
TOTAL OF ABOVE ITEMS $618,099
MOBILIZATION / DEMOBILIZATION (construction only) 5% $30,905
ENGINEERING FEE - - 6% $37,086
CQA (cap only) - 6% $26,657
CONTINGENCY - - 5% $30,905
ADMINISTRATION lump sum - - $3,000
CLOSURE CERTIFICATION lump sum - - $3,000
SURVEY AND DEED lump sum - - $8,500
TOTAL CLOSURE COST (IN 2014 DOLLARS)$758,152
TOTAL CLOSURE COST (IN 2015 DOLLARS) (DEQ Inflation Factor = 1.014)$768,766
TOTAL CLOSURE COST (IN 2016 DOLLARS) (DEQ Inflation Factor = 1.01)$776,454
TOTAL CLOSURE COST (IN 2017 DOLLARS) (DEQ Inflation Factor = 1.013) $786,548
Notes:
1. The unit costs for the cap soils are based on in-place, compacted volumes; no compaction factor is necessary.
2. The unit costs are based on work performed by a third party.
4/17/2017
Appendices and FA_re2017.xlsx

APPENDIX 3
POST-CLOSURE COST ESTIMATES

APPENDIX 3
POST CLOSURE COST ESTIMATE
OXFORD UNIT 1 Permit 39-01
ITEM UNIT QUANTITY UNIT COST ANNUAL COST
INSPECTIONS/ RECORD KEEPING per trip 4 $250 $1,000
MONITORING
Explosive gases (quarterly) per trip 4 $750 $3,000
Groundwater (semi-annually) per trip 2 $6,250 $12,500
Surface Water (semi-annually) per trip 2 $500 $1,000
Subtotal $16,500
LEACHATE COLLECTION AND TREATMENT N/A
ROUTINE MAINTENANCE
Mowing acre 28.8 $145 $4,176
Fertilizing (once every 3 years) acre 9.6 $290 $2,784
Reseeding (once every 3 years) acre 9.6 $1,750 $16,800
Vector and Rodent Control acre 28.8 $30 $864
Subtotal $24,624
WELL MAINTENANCE
Groundwater Wells lump sum 1 $250 $250
Gas Detection Probes/Vents lump sum 1 $250 $250
Subtotal $500
CAP REPAIR (10% of area)lump sum 1 $5,000 $5,000
CORRECTIVE ACTION PLAN ACTIVITIES (MNA&LFG)
Semiannual MNA Sampling and Reporting per trip 2 $6,000 $12,000
CAER (every 5 years) per trip 0.2 $12,500 $2,500
Subtotal $14,500
TOTAL OF ABOVE ITEMS $62,124
ENGINEERING - - 6% $3,727
CONTINGENCY - - 6% $3,727
TOTAL ANNUAL POST-CLOSURE COST (IN 2014 DOLLARS) $69,578
TOTAL 30 - YEAR POST-CLOSURE COST (IN 2014 DOLLARS) $2,087,340
TOTAL 30 - YEAR POST-CLOSURE COST (IN 2015 DOLLARS) (DEQ Inflation Factor=1.014) $2,116,563
TOTAL 30 - YEAR POST-CLOSURE COST (IN 2016 DOLLARS) (DEQ Inflation Factor=1.01) $2,137,728
TOTAL 30 - YEAR POST-CLOSURE COST (IN 2017 DOLLARS) (DEQ Inflation Factor=1.013) $2,165,519
Potential Assessment & Corrective Action (PACA)$2,000,000
Notes:
1. All costs include labor by a third party.
2. Groundwater monitoring costs include sampling as indicated in the CAP and GW Monitoring Plan
3. Surface water monitoring costs include sampling, Appendix II analysis once per year and Appendix I plus
detected Appendix II once per year costs
4. The landfill is not designed with a base liner system or a leachate collection and recovery system;
thus, no leachate monitoring or collection and treatment costs are included.
5. The PACA reserve covers both permitted landfills at the Oxford facility.

4/17/2017
Appendices and FA_re2017.xlsx

APPENDIX 4
POST-CLOSURE INSPECTION RECORD

T-L URE
I TION RE ORD
WELL#:
DATE:
INSPECTOR:-----------COMPANY:
I. Acce:,,s and SeC'uricv Control
Is a notice proh_ibiting the furthe r d_isposai o f\ aste mate rials clearly v isible at the e ntrance to
the foci Li ty?
Is the site adequately i.ecured by n~ans of gate:.. C'haim. berms. fenoes or other i.ecurity
measures to preve nt unauthorized entry?
Are the access roads to and within tJ1e site maintained to provide acress to the dosed disposal
are a and to ail monitoring points?
2. Erosion and Sediment Conlrol
Is the vegetation adequate to stabilize the s ite and preve nt erosion?
Are the erosion oontrol measures adequate to prevent silt from le avi ng the site and to preve nt
excessive on-site e rosion'?
Do the :.ediment basin::. require ck!aning ouL as ind_icted by the level of sed_iment buildup?
3. Drainage Control Require ments
Are ai l areas adequate ly :.loped to promote surface water runoff in a oontrolle d manner?
Are there areas of observed settlement. subsidence. and/or displacement of the clo:.ure C'ap?
Are ail drai nage channe ls free of accumulated sediment?
4. Uncontrolled Escape o f Leachate or Landfill Ca:,,
Are there any leachate seeps observed'?
Are tJ1ere any :,,igns of unC'o ntrolled re lease:,, of land Ii II gas?
5. Leachate Manage ment and S tornee Svste m
Are leac-hate pumps operating properly?
Do the leaC'hate l>torage fadlity(s) require pumping or otJ1er nuinte oance?
6. Environmental Monito ring Svstems
Are ail monito1ing , ells (gas and groundwater) properly maintained? (Note: Complete the
Groundwater Mo nitoring We IJ Mainte nance ReC'ord during semi-annual sampling eve nts.)
7. MiscelJaneous
Are ail site benc hmarks marked and e vident?
Do vecto r contro l measures appear adequate?

APPENDIX 5
GROUNDWATER MONITORING WELL MAINTENANCE RECORD

,ROUND\\"A TER J\lONITO RIN , \\"ELL
MAINTENAN E RECORD
FACILITY:-------------WELL#:
LOCATION: ____________ _ DATE:
COMPANY:
I. b, :.urface wate r diverted a\ ay from tJ1e \\,ell head?
2. b the concrete pad :.ti II intact and free of craC'b ?
3. Has surface water runoff undercut the concrete pad?
~-b the oute r ca:,ing ~till secure and locked?
5. b the well idenLification tag present and b it legible?
.5a. Does LJ1e we II idenLi licaiiom lag provide llle following infomrntion:
T he we II identificatio n number?
Drilling contrac-to r name and registration number?
To tal d.::pth of well?
Depth to sc-ree n?
A w arning 1..hat the wern is no1. for w mer supply :i.nd thm the ground w:i.1.er m:i.y contain
hazardous materials.
6. Is the grout between the inner and o uter well c-asin~ a ll the way to the ground surfoce?
7. ls the inne r casin.g: finnJy g,routed in place?
8. Are the inner and outer casings u prigJll and unobstructed'?
9. ls wate r oollecLing in the oute r casing? Does a weep hole need to be bored in the o uter casing to
provide drainage?
I 0. Is the monitorirng well :tcoessible by :1 four-whee I drive vehicle?
11 . Have brush and wo::ch. been trimmed so that the well i:,casy to locate and nca;ss'?
12. Doe:. the inner ,,e U C'asing h twe a vented ('ap?
13. ls tJ1e monitoring well visible and adequately protected from moving equipment?

APPENDIX 6
METHANE MONITORING TEST REPORT

1\lETHA E l\1 IT RI
TE T REPORT
Facility:
LOC'ation:
Dare of Test:
We ather Condfrion:
Temperature: ____________ _ Barometric Pre ssure:
Sampling Person ne I:
Me•bane Concen•ratlon
Monlt<>1·lnJt Point Descrlptlon.11..ocallon Time (% of LEI..)

APPENDIX 7
FINANCIAL ASSURANCE DOCUMENTATION