WQ0001759_Final Permit_20030321

o f WgrF9 Michael F. Easley, Governor
0 William G. Ross Jr., Secretary
O North Carolina Department of Environment and Natural Resources
> Alan W. Klimek, P.E., Director
p K I Division of Water Quality
March 21, 2003
MR. L.F. "JOE7' HUDSON. JR., DIRECTOR OF WATER/WASTEWATER TREATMENT
CITY OF STATESVILLE
POST OFFICE BOX 1111
STATESVILLE, NORTH CAROLINA 28687
Subject: Permit No. WQ0001759
City of Statesville
Fourth Creek Wastewater Treatment Plant
Surface Disposal of Residual Solids (503)
Iredell County
Dear Mr. Hudson:
In accordance with your closure plan and post -closure care plan received on October 4, 2001, we
are forwarding herewith Permit No. WQ0001759, dated March 21, 2003, to the City of Statesville for the
construction of a rehabilitated final cover system for Area No. 3, Area No. 5, and Area No. 7 of as well as
continued operation of the surface disposal unit at Fourth Creek Wastewater Treatment Plant.
This permit shall be effective from the date of issuance until September 30, 2005; shall void
Permit No. WQ0001759, issued on October 6, 2000; and shall be subject to the conditions and limitations
as specified therein.
This permit is being modified to approve the closure plan and post -closure care plan for the
surface disposal unit. In preparing these documents, the City of Statesville determined that it was
necessary to rehabilitate specific sections of the final cover system so that they meet the minimum
guidance stipulated in the document entitled "Process Design Manual: Surface Disposal of Sewage
Sludge and Domestic Septage (EPA/625/R-95/002)," published by the United States Environmental
Protection Agency's Office of Research and Development. Therefore, this permit modification also
approves the construction that is associated with this rehabilitation work. It should be noted that the City
of Statesville has now successfully met the compliance schedule to submit a formal closure and post -
closure care plan that was required by the last issuance of this permit.
Please take the time to review this permit thoroughly as some of the conditions contained
therein may have been added, changed, or deleted since this permit was last issued- Pay particular
attention to the monitoring requirements in this permit- Failure to establish an adequate system for
collecting and maintaining the required operational information will result in future compliance problems.
Please also make note of this permit's expiration date and the fact that a permit renewal is due to the
Division no later than six months prior to that date (i.e., see Condition VL 6.), as the Division does not
send reminders to apply for permit renewal.
Non -Discharge Permitting Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
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The Division of Water Quality (Division) would like to call your specific attention to Condition I.
2. of this permit. This condition requires that the City of Statesville take care during the construction of
the rehabilitated final cover system to protect the surface disposal unit and the existing groundwater
monitoring wells from damage or impacts to surface water and/or groundwater from runoff. In addition,
if, at any time, the City of Statesville determines that additional or replacement groundwater monitoring
wells are required, the Groundwater Section of the Division's Mooresville Regional Office should be
contacted prior to any installation work so that location, construction standards, initial sampling
requirements, etc. may be discussed.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the
right to request an adjudicatory hearing upon written request within 30 days following receipt of this
permit. This request must be in the form of a written petition, conforming to Chapter 150B of North
Carolina General Statutes, and filed with the Office of Administrative Hearings, 6714 Mail Service
Center, Raleigh, NC 27699-6714. Unless such demands are made, this permit shall be final and binding.
One set of the approved plans is enclosed for your records. If you need any additional
information concerning this matter, please contact Ms. Shannon Mohr Thornburg by telephone at (919)
733-5083, extension 353, or via a -mail at [e-mail].
Sincerely;
Yam_
Lor Alan W. Klimek, P.E.
Enclosure
cc: Mark D. Cathey, P.E., McGill Associates, P.A.
IredeIl County Health Department
Central Office -Groundwater Section
Wilmington Regional Office -Water Quality Section
Wilmington Regional Office -Groundwater Section
Technical Assistance and Certification Unit
Water Quality Central Files
NDPU Files
NDPU Residuals Program Coordinator

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
RALEIGH
SURFACE DISPOSAL OF RESIDUAL SOLIDS (503) PERMIT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as
amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
City of Statesville
Iredell County
FOR THE
construction of a rehabilitated final cover system for Area No, 3, Area No. 5, and Area No. 7 of the
surface disposal unit consisting of the following minimum components: clearing and grubbing of all three
areas; removal of at least two feet of soil from the existing cover in Area No. 3 followed by replacement
of the soil in maximum six-inch lifts to effect a final cover of two compacted feet minimum with a
minimum hydraulic conductivity of 1.0 x 10-5 centimeters per second; placement of additional soil cover
in maximum six-inch lifts to effect a final cover of two compacted feet minimum with a minimum
hydraulic conductivity of 1.0 x 10-5 centimeters per second on top of the existing cover 1 on Area No. 5
and Area No. 7; placement of a minimum six-inch layer of soil above the final cover of all three areas for
the purpose of erosion control and vegetation establishment and maintenance; grading of all soil such that
drainage of stormwater from the final cover system is provided to the existing stormwater management
system; establishment of a shallow -root vegetation on all three areas; installation of fencing around Area
No. 3 to control public access; and provision of all associated appurtenances necessary to make complete
and functional rehabilitated final cover system; AND
continued operation of a post closure care program, including groundwater monitoring, for the surface
disposal unit.
The surface disposal unit, which was originally constructed in 1983, has been inactive since 1996,
is no Ionger permitted to receive residuals, and consists of eight areas comprising 9.4 acres total. Area No.
1 was utilized during 1983, Area No. 2 was utilized during 1984, Area No. 3 was utilized in 1985, Area
No. 4 was utilized in 1985 and 1986, Area No. 5 was utilized in 1986, Area No. 6 was utilized from 1987
through 1994, and Area Nos. 7 and 8 were utilized from 1995 through 1996. All eight areas were filled in
with trenches that were approximately 80 to 100 feet in length and 10 feet in depth. All residuals
disposed in the surface disposal unit were generated by the City of Statesville's Fourth Creek Wastewater
Treatment Plant (NPDES Permit No. NC0031836), Third Creek Wastewater Treatment Plant (NPDES
Permit No. NC0020591), as well as the Statesville Water Treatment Plant.

The activities associated with constructing the rehabilitated final cover on specific areas of the
surface disposal unit as well as the surface disposal itself unit shall not result in a discharge of wastes to
the surface waters; shall be pursuant to the closure plan and post -closure care plan received on October 4,
2001; and shall be in conformity with the project plans, specifications, and other supporting data
subsequently filed and approved by the Department of Environment and Natural Resources and
considered a part of this permit.
This permit shall be effective from the date of issuance until September 30, 2005; shall void
Permit No. WQ0001759, issued on October 16, 2000; and shall be subject to the following specified
conditions and limitations:
I. PERFORMANCE STANDARDS
1. Construction of the rehabilitated final cover system for Area No. 3, Area No. 5, and Area No.
7 of the surface disposal unit shall not proceed until the appropriate soil erosion and
sedimentation control plan approvals have been applied for and secured. The certification
from the North Carolina-Iicensed professional engineer required in Condition I. 3. shall serve
as proof of compliance with this condition.
2. Construction of the rehabilitated final cover system for Area No. 3, Area No. 5, and Area No.
7 of the surface disposal unit shall be scheduled and performed so as not to result in damage
to the unit and/or the groundwater monitoring wells or cause a discharge to the groundwater
and/or surface waters of the State. The certification from the North Carolina -licensed
professional engineer required in Condition I. 3. shall serve as proof of compliance with this
condition.
3. Within 30 calendar days of completing construction of the rehabilitated final cover system for
the surface disposal unit, a certification on the attached form shall be received from a North
Carolina-Iicensed professional engineer certifying that the system have been installed in
accordance with this permit, the approved plans and specifications, and other supporting
materials. If the system is to be constructed in phases and partially certified. the Permittee
shall retain the responsibility to track further construction_ approved under the same „permit
and shall provide a final certificate of completion once construction of all of the facilities
have been completed. The Permittee shall mail one copy of any partial and final
certifications to the NCDENR-DWQ, Water Quality Section, Non -Discharge Permitting Unit,
1617 Mail Service Center, Raleigh, NC 27699-1617.
4. The surface disposal unit shall be effectively maintained and operated as a non -discharge
system to prevent the discharge of any wastes resulting from the operation of the unit.
5. The issuance of this permit shall not relieve the Permittee of the responsibility for damages to
surface waters or groundwater resulting from the operation of the surface disposal unit.
6. In the event that the surface disposal unit is not operated satisfactorily, including the creation
of nuisance conditions, the Pernittee shall contact the Water Quality Section of the Division
of Water Quality's (Division) Mooresville Regional Office, and take any immediate
corrective actions as may be required by the Division.
7. No residuals shall be approved for disposal in the surface disposal unit.

The Permittee shall follow the closure plan and post -closure care plan for the surface disposal
unit (i.e., included as Attachment A to this permit) until expiration of this permit. The
Division shall determine whether or not continued adherence to these plans shall be required
with the review of an application to extend this permit (i.e., see Condition VI.6.).
II. OPERATION AND MAINTENANCE REQUIREMENTS
The surface disposal unit shall be properly maintained and operated at all times.
2. A copy of this permit as well as the closure plan and the post -closure care plan shall be
maintained on site during the Iife of this permit.
Adequate provisions shall be taken to prevent wind erosion from conveying pollutants or
residuals from the surface disposal unit onto the adjacent property or into any surface waters.
4. Adequate provisions shall be taken to prevent any surface runoff from occurring from the
surface disposal unit. If runoff cannot be prevented, a collection system shall be installed
with the capacity to handle runoff from a 24-hour, 25-year storm event. All collected runoff
shall be disposed in a manner approved by the Division.
5. A protective vegetative cover shall be established and maintained on the surface disposal
unit, berms, pipe runs, erosion control areas, and surface water diversions. Trees, shrubs, and
other woody vegetation shall not be allowed to grow on the final cover system of the unit.
All areas within the boundary of the unit shall be kept mowed or otherwise controlled and
accessible.
Appropriate measures shall be taken to control public access to the surface disposal unit
during active use and for the 36-month period following closure of the surface disposal unit.
Such controls may include fencing and the posting of signs indicating the activities being
conducted at the unit.
III. MONITORING AND REPORTING REQUIREMENTS
Any monitoring (i.e., including groundwater, surface water, residuals, soil, or plant tissue
analyses) deemed necessary by the Division to insure protection of the environment shall be
established and an acceptable sampling and reporting schedule shall be followed.
2. Noncompliance Notification:
The Pern-dnee shall report by telephone to the Water Quality Section of the Division's
Mooresville Regional Office, telephone number [phone], as soon as possible, but in
no case more than 24 hours or on the next working day following the occurrence or first
knowledge of the occurrence of any of the following:
a. Any occurrence with surface disposal activities that results in the disposal of significant
amounts of wastes that are abnormal in quantity or characteristic.
b. Any failure of the surface disposal activities resulting in a release of material to receiving
waters.

c. Any time that self -monitoring information indicates that the surface disposal unit has
gone out of compliance with the conditions and limitations of this permit or the
parameters on which the system was designed.
d. Any process unit failure, due to known or unknown reasons, that renders the surface
disposal unit incapable of adequate residual treatment.
e. Any spillage or discharge from a vehicle or piping system transporting residuals to the
surface disposal unit.
Persons reporting such occurrences by telephone shall also file a written report in letterform
within five days following first knowledge of the occurrence. This report must outline the
actions taken or proposed to be taken to ensure that the problem does not recur.
IV. GROUNDWATER REQUIREMENTS
Sampling Requirements:
a. Groundwater monitoring wells MW-1, MW-2, and MW-3 shall be sampled every
December for the parameters listed below:
Cadmium
Nitrate -Nitrogen
Total Organic Carbon
Copper
pH
Volatile Organic Compounds
Chlorides
Total Dissolved Solids
Water Level
Fecal Coliform
Water levels in the groundwater monitoring wells shall be measured prior to sampling the
groundwater for the remaining parameters. The depth to water in each well shall be
measured from the surveyed point on the top of the casing, which shall be surveyed
relative to a common datum.
b. Volatile organic compounds (VOCs) shall be analyzed using one of the following
methods:
i. Standard Method 6230D (PQL at 0.5 µg/L or less),
ii. Standard Method 6210D (PQL at 0.5 µg/L or less),
iii. EPA Method 8021 (Low Concentration, PQL at 0.5 µg/L or less),
iv. EPA Method 8260 (Low Concentration, PQL at 0.5 µg/L or less), or
v. Another method with prior approval by the Groundwater Section Chief
Any of the referenced methods used for VOCs shall, at a minimum, include all of the
constituents listed in Table VUl of Standard Methods 6230D. The method used shall
provided a PQL at 0.5 µg/L or less, which shall be supported by laboratory proficiency
studies as required by the Division's Laboratory Certification Unit. Any constituents
detected above the MDL, but below the PQL at 0.5 µg/L, shall be qualified (i.e.,
estimated) and reported.
If any VOCs are detected by the methods listed, then the Groundwater Section Supervisor
of the Division's Mooresville Regional Office at telephone number [phone] shall
be contacted immediately for r further instructions regarding any additional follow-up
samplinglanalysis required. The results of all initial and follow-up samplinglanalysis
shall be submitted simultaneously.

c. If total organic carbon (TOC) concentrations greater than 10 milligrams per liter are detected in
any downgradient groundwater monitoring well, additional sampling and analysis shall be
conducted to identify the individual constituents comprising this TOC concentration. if the
TOC concentration as measured in the background well exceeds 10 milligrams per liter, this
concentration shall be taken to represent the naturally -occurring TOC concentration. Any
exceedances of this naturally -occurring TOC concentration in downgradient wells shall be
subject to the additional sampling and analysis as described in this permit.
d. Any laboratory selected to analyze parameters shall be Division -certified for those
parameters required.
2. Reporting/Documentation Requirements:
a. The results of the sampling and analysis shall be received on the most -recent version of
"Groundwater Quality Monitoring: Compliance Report Form" (i.e_, GW 59 Form) with
copies of the laboratory analyses attached by the Division's Groundwater Section on or
before the last working day of the month following the sampling month.
b. All reports shall be mailed to the following address:
NCDENR-DWQ
Groundwater Section
Permits and Compliance Unit
1636 Mail Service Center
Raleigh, NC 27699-1636
Updated blank reporting forms may be downloaded from the web site for the Division's
Groundwater Section at http://gw.ehnr.state.nc.us/ or requested from the address listed
above.
3. Applicable Boundaries:
a. The COMPLIANCE BOUNDARY for the surface disposal unit is specified by
regulations in 15A NCAC 2L (i.e., Groundwater Classifications and Standards). The
Compliance Boundary for surface disposal units individually permitted after December
31, 1983, shall be is established at either (1) 250 feet from the surface disposal unit or
(2) 50 feet within the property boundary, whichever is closest to the surface disposal unit.
An exceedance of Groundwater Quality Standards at or 'beyond the Compliance
Boundary is subject to immediate remediation action according to 15A NCAC 2L .0106
(d)(2).
b. The REVIEW BOUNDARY shall be established around the surface disposal unit
midway between the Compliance Boundary and the perimeter of the surface disposal
unit. Any exceedance of Groundwater Quality Standards at the Review Boundary shall
require action in accordance with 15A NCAC 2L .0106 (d)(1).
4. Other R uirements:
a. Any additional groundwater quality monitoring, as deemed necessary by the Division,
shall be provided.

V. INSPECTIONS
The Permittee or his designee shall inspect the surface disposal unit to prevent malfunctions
and deterioration, operator errors and discharges which may cause or lead to the release of
wastes to the environment, a threat to human health, or a nuisance. The Permittee shall
maintain an inspection log or summary including at least the date and time of inspection;
observations made; and any maintenance, repairs, or corrective actions taken by the
Permittee. This log of inspections shall be maintained by the Permittee for a period of five
years from the date of the inspection and shall be made available to the Division or other
permitting authority, upon request.
2. Any duly authorized officer, employee, or representative of the Division may, upon
presentation of credentials, enter and inspect any property, premises, or place on or related to
the surface disposal unit at any reasonable time for the purpose of determining compliance
with this permit; inspect or copy any records that must be kept under the terms and conditions
of this permit; and obtain samples of groundwater, surface water, or leachate.
VI. GENERAL CONDITIONS
This permit shall become voidable unless the surface disposal unit activities are carried out in
accordance with the conditions of this permit, the supporting materials, and in the manner
approved by this Division.
2. This permit shall be effective only with respect to the nature and volume of wastes described
in the application and other supporting data.
3. This permit shall not be automatically transferable. In the event that there is a desire for the
surface disposal unit to change ownership or a name change of the Permittee, a formal permit
request shall be submitted to the Division accompanied by documentation from the parties
involved and other supporting materials as may be appropriate. The approval of this request
shall be considered on its merits and may or may not be approved_
4. Failure to abide by the conditions and Iimitations contained in this permit may subject the
Permiittee to an enforcement action by the Division in accordance with North Carolina
General Statutes § 143-215.6A through § 143-215.6C.
5. The annual administering and compliance fee shall be paid by the Permittee within 30 days
after being billed by the Division. Failure to pay the fee accordingly may cause the Division
to initiate action to revoke this permit as specified by 15 NCAC 2H .0205 (c)(4).
5. The issuance of this permit does not preclude the Permittee from complying with any and all
statutes, rules, regulations, or ordinances which may be imposed by other government
agencies (i.e., local, state, and federal) which have jurisdiction, including, but not limited to,
applicable river buffer rules in 15A NCAC 2B .0200, erosion and sedimentation control
requirements in 15A NCAC Chapter 4 and under the Division's General Permit NCG010000,
and any requirements pertaining to wetlands under 15A NCAC 2B .0200 and 15A NCAC 2H
.0500.

6. The Pernuttee, at least six months prior to the expiration of this permit, shall request its
extension. Upon receipt of the request, the Division shall review the adequacy of the surface
disposal unit described therein and, if warranted, shall extend the permit for such period of
time and under such conditions and limitations as it may deem appropriate.
7. This permit may be modified, or revoked and/or reissued to incorporate any conditions,
limitations, and monitoring requirements the Division deems necessary in order to protect the
environment and public health adequately.
Permit issued this the twenty-first day of March, 2003.
NORTH C OLINA ENVIRONMENTAL MANAGEMENT COMMISSION
for Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number WQ0001759

Permit No. WQ0001759
March 21, 2003
ENGINEER'S CERTIFICATION
Partial Final
I, , as a duly registered Professional Engineer in the State
of North Carolina, having been authorized to observe (periodically, weekly, full time) the construction of
the project,
Project Name
Location and County
for the Perrnittee, do hereby state that, to the best of my abilities, due care and diligence was used in the
observation of the construction such that the construction was observed to be built within substantial
compliance and intent of this permit, the approved plans and specifications, and other supporting
materials.
Signature
Date
Registration No.

ATTACHMENT A - Approved Closure Plan and Post -Closure Care Plan

Owner: City of Statesville NIl i I +fli
�H EAR p f.
Contact: Mr. Jerry Byerly �0•`••�i
Assistant Director of Water Resources
r' 2615e Imo d
Mailing Address: P.O. Box 1111 a ;
Statesville, NC 28687-111 I 4;
Telephone Number: 704-878-3438 Phone
fi��►iii RO,���
704-878-8655 (Fax)
Address of Monofill: Fourth Creek Wastewater Treatment Plant
693 Bell Farm Rd
Statesville, NC 28625
INTRODUCTION AND PURPOSE
Permit No. WQ0001759 (Permit) issued by the North Carolina Department of Environment and
Natural Resources (NCDENR) requires the City of Statesville (City) to submit a formal closure and
post -closure plan to the Division of Water Quality (DWQ) within 360 days (October 11, 2001) of
Permit issuance. The Permit refers to the Process Design Manual: Surface Disposal of Sewage and
Domestic Septage (EPA/635/R-95/002), published by the United States Environmental Protection
Agency's Office of Research and Development, as a guidance for closure and post -closure of the
Monofill. The design manual suggests a cover thickness of 2 feet (18 inches of compacted soil,
achieving a hydraulic conductivity of 1 x 10-5 cm/sec, and an erosion layer of 6 inches to establish a
stand of grass over the cap). On behalf of the City, HDR Engineering, Inc. of the Carolinas (HDR)
has developed this closure and post -closure plan. The format for the plan has been adapted from the
outline in the Process Design Manual. Certain sections of the Process Design Manual outline do not
apply to this project.
HDR investigated the eight areas and discovered that three areas did not meet cover thickness or
hydraulic conductivity requirements. This PIan is submitted to meet the requirements of NCDENR. It
provides closure requirements for Areas 3, 5, and 7 and post -closure care for all of the areas.
LO ACTIVE SEWAGE SLUDGE UNIT CONDITIONS
The following sections provide general information about the Fourth Creek Wastewater Treatment
Plant (WWTP) Monofill Facility (Monofill) and a schedule for final closure.
1.1 General Information
The Monofill consists of eight areas (designated Areas 1 through 8) comprising 9.4 acres total. The
areas were filled by trench placement of wastewater residuals and utilized from 1983 through 1996.
The site drawing is shown on Figure 1. Discussions with City of Statesville (City) staff followed by
ID
field verification shows that the trenches were capped with on -site soils.
The areas where sludge was placed are well vegetated with grass, brush, and trees. HDR and City
staff excavated soil test pits in all eight areas on April 3, 2001. Numerous pits were excavated but

only 11 test pits uncovered sludge. Depths of cover were measured at these test pits. Approximate
locations of the 11 test pits are shown on the site map provided by the City (see Figure 1). For each
area, when possible, Shelby tubes were pushed to collect undisturbed samples for hydraulic
conductivity analysis as described by ASTM D5084. Samples were analyzed by Geo-Environmental
Consultants in Charlotte, NC. Seven samples were collected to determine hydraulic conductivity.
The majority of the Monofill cover passed or exceeded the suggested guidelines for cover depth and
hydraulic conductivity. They are Areas 1, 2, 4, and 6. Based on several excavations and discussion
with the City, Area 8 apparently does not contain sludge. However, Areas 3, 5, and 7 require cover
rehabilitation. Laboratory results on samples obtained from the test pits, as well as measured cover
thickness, are summarized in Table 1.
Table 1. Summary of Field and Laboratory Test Results
Test Pit
No. Area
Requirements
Cover Soil
Thickness
(FT)
> 2.0
Dry Density
(PCF)
None
Moisture
Content
(%)
None
Hydraulic
Conductivity
(cm/sec)
< 1.0E-5
Pass/Fail
1
2
2.0
86.4
31.9
2.7E-06
Pass
2
6
4.0
97.7
21.3
3.4E-06
Pass
3
6
4.5
83-8
38.1
8.9E-06
Pass
4
5
< 1.0
-
-
_
Fail
5
5
1.5
-
-
-
Fail
6
5
3.5
82.3
30.4
99E-07
Pass
7
7
0.1-1.5
-
-
Fail
8
7
Exposed - 2.0
-
-
-
Fail
9
4
2.0 - 3.5
89.6
27.6
8.6E-06
Pass
10
1
3.5 -- 4.5
90.2
29.8
7.8E-06
Pass
11
3
4.5
85.2
31.1
2.7E-04
Fail
Note: Parameters marked in bold indicate failure.
Size of Active Sewage Unit - No part of the Monofill is actively receiving sludge. HDR and the
City staff delineated and surveyed Areas 3, 5, and 7 on August 1 and 15, 2001. Construction
boundaries are shown on the Construction Drawings (Drawing C-1). The total area requiring cover
rehabilitation is approximately 2.0 acres.
Description of Liner - The Monofill does not contain a liner.
Description of Leachate Collection System - The Monofill does not have a leachate collection
system. A review of groundwater results and visual inspection of the sludge suggests it is not
necessary because the sludge appears stable. -
Copy of NPDES permit - The Monofill does not discharge to U.S. waters. Therefore, a NPDES
permit is not required.
2

1
1.2 Schedule of Final Closure
The Monofill has not received sludge since 1996, and the City is prepared to close the Monofill once
funding is in place. Upon DWQ approval, the City will begin rehabilitation activities within 12
months, and it is anticipated that those activities will take no longer than 120 days.
2.0 DISPOSING OF SEWAGE SLUDGE
The following sections provide information on sludge volume and the procedures that were used for
sludge disposal.
2.1 Sludge Volume
Based on conversations with City staff, we estimate that between 40,000 and 75,000 cubic yards
(CY) of sludge have been placed in the Monofill during the period of operation.
2.2 Sludge Disposal Procedures
Sludge was disposed in trenches that were 80 to 100 feet in length and approximately 10 feet in
depth. The exact boundaries and the number of trenches are unknown because it was not
documented during the placement of sludge. Based on interviews with the operator, about 25 to 50
percent of the surface area contains sludge trenches.
3.0 COVER AND VEGETATION
3.1 Final Cover, Characteristics, and Design
Final Cover Area — The total area requiring cover rehabilitation (Areas 3, 5 and 7) is approximately
9,700 square yards (SY) (2.0 acres). See Table 2 for the individual areas.
Table 2. Cover Area and Volume
Area I.D. Cover Area (SY) Vegetation Area .additional Cover Erosion Control
(SY) Volume (CY) Silt Fence (LF)
1. 11 1
Characteristics of Final Cover — On -site soil will be used for the cover. The USCS visual
description of the soil from random grab samples is red silty clay to clayey silt with some to a trace
of sand. The final cover will consist of 2 feet (18 inches of compacted soil, achieving a hydraulic
conductivity of Ix10"5 cm/sec, and an erosion Iayer of 6 inches to establish a stand of grass over the
cap). The minimum permeability will be achieved by compacting the soil in 6-inch lifts. Tests will
be conducted on site to assure permeability will not exceed 1x10-5 cm/sec. Additional soil needed to
complete the closure is approximately 5,000 CY (see Table 2).
3

_ Test pits show that Area 3 has adequate cover
cleared and grubbed to uproot existing vegetation
in a careful manner so that sludge is not exposed.
and compacted to meet permeability requirements
(4.5 feet), but fails permeability. Area 3 will be
At least 2 feet of existing cover will be removed
The removed soil will be reapplied in 6-inch lifts
Additional soil will be applied if necessary.
Areas 5 and 7 will also be cleared and grubbed to uproot existing vegetation. Two feet of soil will be
placed on top of the existing cover. The soil will be placed in 6-inch lifts and compacted to meet
permeability requirements.
Final Cover Design — A minimum slope of 2 percent will be provided to the final cover to allow
drainage. The maximum length of run of slope will be 300 feet. Contouring will be such to allow
drainage to the existing channels.
3.2 Vegetation.
Depending on the season, temporary or permanent grass and shallow root vegetation will be placed.
It is expected that the total area requiring vegetation will be 10,700 SY (2.2 acres). This area is 10
percent more than the covered area to account for the construction and on -site soil disturbance.
Native plants of low maintenance and shallow roots will be planted. Grass seed mixtures may
consist of Kentucky No. 31 Fescue, Nurse Grass Seed, Browntop Millet, and Winter Rye. The
seeding schedule is shown on the Construction Drawings.
3.3 Erosion Control
The Process Design Manual states that the vegetation layer serves as the permanent erosion control
for water and wind. Therefore, vegetation will be planted immediately after the compacted soil and
erosion layers are in place_ Temporary erosion control will consist of approximately 1,500 LF of silt
fence placed downgradient of the areas. The location of the silt fence is shown on the Construction
Drawings, and the length of each area is shown on Table 2. Gravel (No. 57) will be placed at all
construction entrances/exits.
4.0 GROUNDWATER MONITORING
The following sections provide information about analytical requirements and maintenance of
groundwater monitoring equipment.
4.1 Analytical Requirements
The site has three groundwater monitoring wells: MW-1, MW-2, and MW-3. As required by the
Permit, samples are tested every December for cadmium, copper, chlorides, fecal coliform, nitrate -
nitrogen, pH, total dissolved solids, total organic carbon, water level, and volatile organic
compounds. Results are compiled on the Groundwater Quality Monitoring Compliance Report Form
(i.e., Form GW-59) and submitted to DWQ.
4.2 Maintenance of Groundwater Monitoring Equipment
The monitoring wells are in good condition. Under the post -closure plan, the City will inspect the
equipment whenever the wells are sampled.
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5.0 COLLECTION, REMOVAL, AND TREATMENT OF LEA CHATE
This section is not applicable because there is no leachate collection system. A review of
groundwater results and visual inspection of the sludge suggests it is not necessary because the
sludge appears stable.
6.0 METHANE MONITORING
This section is not applicable because there is no methane -monitoring program. The Permit does not
require such a program to be in place.
7.0 MAINTENANCE ACTIVITIES
7.1 Site Inspections
As part of the post -closure plan, structures, areas, and monitoring equipment will be inspected for
three years. The following will be inspected quarterly, semi-annually or annually: security control
devices; cover drainage system functioning; groundwater monitoring equipment; erosion damage;
cover settlement, subsidence, and displacement; vegetative cover condition; stormwater control
system; and the benchmark integrity. In addition to the inspection frequency, certain inspection
activities will occur within 5 days of a major storm (i.e., 1 inch or greater in any 24-hour period).
The inspection frequency and post -storm inspections are shown in Table 3.
Table 3. Post -Closure Inspection Frequencies
Inspection Activity
Security Control Devices
Frequency
Quarterly
Cover Drainage System Functioning
Quarterly`
Groundwater Monitoring Equipment
When Sampled
Erosion Damage
Quarterly'
Cover Settlement, Subsidence, and Displacement
Quarterly
Vegetative Cover Condition
Quarterly
Stormwater Control System
Quarterly'
Benchmark Integrity
Annually
Note: 1. These items will also be inspected within 5 days of each
major storm event_
7.2 Planned Responses
The following are planned responses should a problem occur:
Repair of Security Control Devices — All security control devices will be inspected and maintained
as necessary to ensure access to the site is controlled. Locks, vehicular gates, and fencing will be
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replaced if functioning improperly. Warning signs will be kept legible at all times and will be
replaced if damaged by inclement weather or vandalism.
Erosion Damage Repair — if erosion of the final cover occurs during post -closure, the affected area
will be repaired and reseeded as necessary. Excessive slopes will be flattened, if possible, by adding
clean fill material. If necessary, erosion control fabrics will be used to expedite rapid revegetation of
slopes and to secure topsoil in place. Rough surfaces that cause isolated erosion areas will be graded
and reseeded as necessary.
Groundwater Monitoring Equipment -- Groundwater wells will be inspected each time they are
- sampled to ensure integrity. Persons inspecting a well should Iook for signs of well tampering,
cracking, or degradation, and determine whether the well needs to be replaced. If the decision is
made to replace and abandon a well, the replacement well should be installed 5 to 10 feet from the
abandoned well in accordance with previous well specifications. Well abandonment should be
accomplished by pulling the casing out and grouting the hole. Annual sampling and analysis will
continually be submitted to DWQ. Any groundwater quality concentrations above the Permit limits
shall be immediately reported to the Mooresville Regional Office Groundwater Supervisor, as stated
by the Permit.
Repair of Run-On/Run-Off Control Structures — All side slope terraces, ditches, and perimeter
channels will be repaired, cleaned, or realigned in order to maintain original condition.
7.3 Maintenance of Cover and Vegetation
The vegetation layer shall be mowed or bush -hogged twice per year. The following activities will
occur as recommended from a landscaper or the USDA Soil Conservation Services: reseeding of
areas, reconditioning (supplemental fertilization and aeration) or the addition of topsoil, and the
irrigation schedule.
7.4 Control of Erosion
The cover will be inspected quarterly and after major storm events. If additional vegetation is not
adequate to control erosion, sedimentation ponds will be constructed. Existing drainage channels will
be cleared as needed. On -site soil will be used if additional soil is needed. If the volume of on -site
soil is inadequate, the Monofill will transport soil from an off -site location, subject to approval.
8.0 INSTALLATION AND MAINTENANCE OF THE FENCE
8.1 Existing Fence
The existing chain -link fence is secure and in good condition for the exception that it does not
encompass Area 3. The fence is approximately 6 feet high with barbwire strands above.
8.2 New Fence
Approximately 800 LF of new fence will be added to enclose Area 3 with a 50-foot buffer around the
cover. Approximately 300 LF of existing fence may be relocated for the new installation. The
additional area enclosed area by the new fence is less than 2 acres. The location of the new fence is
shown on the Construction Drawings.
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1
8.3 Security and Public Access for Post -Closure Period
Locks at all gate entrances will be replaced prior to construction to ensure security. During
construction and throughout the post -closure period, the fence, gates, and locks will be inspected
quarterly.
9.0 CLOSURE SCHEDULE
The frequency of the inspections is shown on Table 3, and the Post -Closure Inspection Checklist is
shown on Figure 2. The Post -Closure inspection period will be 3 years unless otherwise notified by
NCDENR or other authoritative agency. After the end of the Post -Closure period, the City will
request an Engineering Certification of compliance to be submitted to NCDENR.
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FIGURE 2
POST -CLOSURE INSPECTION CHECKLIST
Location:
Date: Time:
Weather: Completed By:
Yes No
I. Security Control Devices:
Are security control devices in place and functioning? ❑ ❑
Are all warning signs prominent and legible? ❑ ❑
Are there any signs of unauthorized entry on the site? ❑ ❑
Are there signs of illegal dumping on site? ❑ ❑
II. Final Cover System:
Is the final cover free of erosion and depressions? ❑ ❑
Is the vegetative cover continuous and in good condition, ❑ ❑
free of bare spots?
Does the site require mowing? (If yes, mow grass and note ❑ ❑
in comment section below.)
Is there ponding of water on final cover system? ❑ ❑
III. Groundwater Monitoring Wells:
Is the casing upright and unobstructed? ❑ ❑
Is the outer casing secure and locked? ❑ ❑
Is the ID tag present and legible? ❑ ❑
IV. Miscellaneous:
Are all benchmarks visible and intact? ❑ ❑
Are all ditches free of debris and litter? ❑ ❑
Are any odors present which may indicate landfill gas migration? ❑ ❑
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Comments
Please use the section below to comment on any area not covered above and also note any areas of
concern or needing immediate attention.
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