DSHW-2024-006744

Attachment 1 – Plan of Operations
3111v TE •
REGIONAL LANDFILL
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Div of Waste Management
and Radiation Control
MAR 0 2 2021
r75HW-2021-00 3596
PLAN OF OPERATIONS
(HAL Project No.: 373.02.101)
February 2021
INTERMOUNTAIN REGIONAL LANDFILL
PLAN OF OPERATIONS
(HAL Project No.: 373.02.101)
afinsER SILLER LUCEmc
ENGINEERS
February 2021
TABLE OF CONTENTS
TABLE OF CONTENTS
CHAPTER 1 - INTRODUCTION 1-1
CHAPTER 2 — EMERGENCY RESPONSE INFORMATION 2-1
CHAPTER 3 — BACKGROUND INFORMATION 3-1
3.1 FIXED LANDFILL FEATURES 3-1
3.2 LANDFILL EQUIPMENT 3-1
CHAPTER 4 — SCHEDULE OF CONSTRUCTION 4-1
CHAPTER 5 — SOLID WASTE HANDLING 5-1
5.1 WASTE DISPOSAL 5-1
5.2 PLACEMENT OF COVER SOILS 5-1
CHAPTER 6 — INSPECTIONS, MONITORING, AND REPORTING 6-1
6.1 INSPECTIONS 6-1
6.2 GROUNDWATER MONITORING 6-1
6.3 LANDFILL GAS MONITORING 6-3
CHAPTER 7 — CONTINGENCY AND CORRECTIVE ACTION PLANS 7-1
7.1 FIRE 7-1
7.1.1 FIRE IN A LOADED VEHICLE 7-1
7.1.2 FIRE ON THE WORKING FACE OR BELOW COVER 7-1
7.2 EXPLOSION 7-2
7.3 FAILURE OF RON-OFF/RUN-ON STRUCTURES 7-2
7.3.1 FAILURE OF RUN-OFF STRUCTURES 7-2
7.3.2 FAILURE OF RUN-ON STRUCTURES 7-2
7.4 RELEASE OF EXPLOSIVE GASES 7-3
7.5 GROUNDWATER CONTAMINATION 7-3
CHAPTER 8 — CONTROL OF NUISANCE CONDITIONS 8-1
8.1 FUGITIVE DUST 8-1
8.2 LITTER 8-1
8.3 RODENT CONTROL 8-1
8.4 BIRD CONTROL 8-2
CHAPTER 9 — ALTERNATIVE WASTE-HANDLING PROCEDURES 9-1
CHAPTER 10 — MONITORING PROCEDURES 10-1
10.1 GENERAL 10-1
10.2 GROUNDWATER MONITORING WELLS 10-1
10.3 GAS MONITORING LOCATIONS 10-1
CHAPTER 11 — WASTE-SCREENING PROCEDURES 11-1
CHAPTER 12 — TRAINING PROGRAM 12-1
Intermountain Regional Landfill Plan of Operations
APPENDIX A
Inspection Form
LIST OF TABLES
Table 2-1 Emergency Phone Numbers 2-1
Table 2-2 Landfill Contact Information 2-1
Table 2-3 Landfill Equipment 3-1
Table 6-1 Inspections 6-1
LIST OF FIGURES
Table 6-1 Utah Requirements for Groundwater Monitoring 6-2
Intermountain Regional Landfill ii Plan of Operations
CHAPTER 1 - INTRODUCTION
The purpose of this Plan of Operations is to assist the Landfill Operations Manager and operating
personnel in conducting day-to-day operations in a manner that is consistent with the various
permit requirements and with the design of the Intermountain Regional Landfill. The Plan
describes the following: emergency response procedures, permit conditions, designed facilities
at the landfill, equipment, personnel requirements for proper operation, procedures for waste
handling, requirements for inspections, monitoring, and reporting, contingency plans and
corrective action programs, alternative waste handling, maintenance of landfill monitoring
equipment, vector control, waste screening to exclude hazardous wastes and a general training
program for landfill operators.
Intermountain Regional Landfill 1-1 Plan of Operations
CHAPTER 2 - EMERGENCY RESPONSE INFORMATION
Landfill emergencies include injury, dismemberment, or death of personnel, and fire, explosion,
or other catastrophic events. Because of its remote location, the landfill maintains its own fire
protection equipment for building and equipment, and personnel are trained in the operation of
this equipment. Landfill fires at the surface will be controlled by using soil to smother any fires. A
water truck will also be available to supplement fire suppression activities. Because of the landfill's
remote location, injured personnel will be transported to medical facilities in landfill vehicles if their
condition allows movement. The Operations Manager or his designee may request that
ambulance and paramedical personnel meet the transporting vehicle en route to the medical
facility.
Table 2-1 below lists the phone numbers to access emergency services for other emergencies.
This list is posted directly adjacent to each phone on the facility site in a colorless, protective
plastic cover.
TABLE 2-1
EMERGENCY PHONE NUMBERS
Emergency
Service
Provider
Emergency Phone
Number
Direct Phone Number
Fire and Rescue 911
Hospital 911
Utah Valley
Regional
Medical Center
[phone]
Mountain View
Hospital
[phone]
Utah County Fire
Marshal
[phone]
Sheriff [phone]
Office [phone]
In the event of any emergency, the personnel in Table 2-2 will also be notified. Landfill personnel
will also be provided with 2-way radios for communicating while on site.
TABLE 2-2
LANDFILL CONTACT INFORMATION
Name Title Phone
Rob Richards President [phone]
Brian Alba Operations Manager [phone]
Mason Lyman Scale Attendant [phone]
Mike Vano Operator [phone]
Gibby McDougal Operator [phone]
Intermountain Regional Landfill 2-1 Plan of Operations
CHAPTER 3 - BACKGROUND INFORMATION
3.1 FIXED LANDFILL FEATURES
The overall site plan consists of three main cells with each containing its own leachate collection
system, sump and leachate withdrawal system. Cells 2 and 3 are both similar in design which
drain down the center of the cell to a sump located on the far east end of the cell floor. Cell 1
differs because it included the 20-acre area that has already been developed. The design of Cell
1 was altered in 2016 with a sump located on the north side because the previous design placed
the floor trajectory toward the east which would have made the excavation much deeper.
The landfill includes a scale house and administrative office. An all-weather access road exists
from the entrance to the area of the first landfill cell. Temporary internal access roads are
constructed and rerouted as waste is placed and fill grades change. Other ancillary features
include perimeter access control fencing and environmental monitoring equipment.
3.2 LANDFILL EQUIPMENT
Table 3-1 presents the equipment currently in use for landfill operations. Compactors and dozers
are used to move and compact waste disposed at the landfill and for placing daily and
intermediate cover. Dozers and loaders are used for general site operating activities such as road
maintenance, embankment construction, and snow removal. The track excavator will be used to
excavate landfill units, maintain runoff and run-on controls, and load the haul truck, which will haul
materials within the site. The water truck will be used for dust control and the recycling of leachate,
if needed. There are several generators on site to provide power to support facilities.
TABLE 3-1
LANDFILL EQUIPMENT
Type Model
Compactor CAT 836K (4)
Dozer CAT D8T
Track Excavator CAT 349E, Volvo 330B
Haul Truck CAT 740B (2), CAT 735
Motor Grader CAT 140M
Loader CAT 950H
Vibratory Compactor CAT
Allmand Light Plants (3)
Whisper Watt Generator (2)
Water Truck (2)
Portable Landfill Tipper (2)
Service Truck/Mechanic Truck -
intermountain Regional Landfill 3-1 Plan of Operations
CHAPTER 4 SCHEDULE OF CONSTRUCTION
The Intermountain Regional Landfill consists of a single municipal landfill divided into 3 cells that
are constructed in phases. The final phases of Cell 1 will be constructed in the coming years with
a shift to phased construction of Cell 2 thereafter. Construction of Cell 3 is not expected to occur
for some time.
A Gas Collection and Control System (GCCS) is currently in design and is set to be installed and
operational by February 28, 2022. Expansion of the GCCS will occur in phases as waste is placed.
Intermountain Regional Landfill 4-1 Plan of Operations
CHAPTER 5 - SOLID WASTE HANDLING
5.1 WASTE DISPOSAL
All waste entering the site will be weighed and weights recorded. Customers will be directed to
the working face where the driver will be instructed to discharge the load. Landfill operations
personnel will push the solid waste down the working face using a compactor. The waste will be
placed in lifts with a loose thickness of 2 to 3 feet. After the waste has been placed in loose lifts,
the operator will run the compactor over all parts of the lift at least two times parallel with the
slope. These general procedures may change depending on site conditions, current lift height,
weather, waste type, etc. Equipment operators will also maintain the working face so that it is as
small as practical to allow efficient unloading of transfer trucks and placing and compacting of
solid wastes.
5.2 PLACEMENT OF COVER SOILS
Cover soils will be placed over solid wastes to minimize the potential for nuisance conditions, fire,
and contact between disease vectors and solid wastes. Nuisance conditions include odor
generation and air discharges, blowing of plastic and paper wastes, and other conditions that
impair the use of adjoining properties.
At the end of each working day, the landfill operations personnel will cover all solid wastes
received during that day with daily cover. The daily cover will consist of a minimum of 6 inches of
soil excavated from other parts of the landfill site. Daily cover will be placed to minimize the
nuisance, fire, and disease vector potential attributable to each day's waste placement.
Whenever part of the landfill cell will be inactive for an extended period, landfill operations
personnel will place an intermediate cover over the inactive part. The intermediate cover will
reduce the potential for wind- and water-induced erosion of the cover and will reduce the
production of leachate and contact stormwater within the landfill cell. The intermediate cover will
consist of 6 additional inches of soil on the daily cover.
intermountain Regional Landfill 5-1 Plan of Operations
CHAPTER 6 - INSPECTIONS, MONITORING, AND
REPORTING
6.1 INSPECTIONS
The Operations Manager is responsible for conducting and recording routine inspections of landfill
facilities. The schedule for conducting routine inspections is provided in Table 6-1. Forms for
recording routine inspections are presented in Attachment A. The Operations Manager is
responsible for verifying the completeness of the inspection records on a quarterly basis.
TABLE 6-1
INSPECTIONS
Landfill Facility Inspection Frequency
Landfill Cell Daily and intermediate cover integrity
Stormwater and leachate collection (surface ponding)
Daily
Daily
Leachate Pond
(not constructed
yet as of 2021)
Perimeter fence integrity
Water depth
Liner system integrity
Water volume
Daily
Weekly
Weekly
Quarterly
Other
Appurtenances
Entrance/main gate integrity
Perimeter fence integrity
Monitoring well integrity
Equipment maintenance
Site road integrity
Berm integrity
Daily
Weekly
Monthly
Monthly
Quarterly
Quarterly
6.2 GROUNDWATER MONITORING
The Groundwater Monitoring Plan is included in the Permit Application as Appendix G. As
specified in the Utah Department of Environmental Quality (UDEQ) regulations (R315-308-
2(4)(a)) and Subtitle D (40 Code of Federal Regulations [CFR] 258 53) regulations, background
data for the detection monitoring constituents were established on all monitoring wells.
Background data was generated by sampling the monitoring wells on a monthly basis after
construction. To provide an acceptable level of confidence in the data, a minimum of eight
samples were collected and analyzed to establish background concentrations. The groundwater
data will be maintained in a database and used as the foundation for determining statistically
significant increases during assessment monitoring, described below.
During assessment monitoring, groundwater samples will be collected semiannually. The results
will be entered into a database and the data reviewed to determine if a statistically significant
increased has occurred. If a statistically significant increase in groundwater contaminants is
detected as part of the Detection Monitoring Program, the Intermountain Regional Landfill will
initiate the following actions.
• Notify UDEQ in writing within 14 days of obtaining laboratory results. The notification will
include identification of the constituents that have shown a statistically significant increase.
Intermountain Regional Landfill 6-1 Design Engineering Report
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• Enter the laboratory results into the operating record for the landfill.
• Immediately resample the groundwater in all wells, or a subset of the wells as specified
by the Director, for all constituents listed in R315-308-4. Determine whether a statistically
significant change has occurred such that the groundwater protection has been
compromised.
• If a statistically significant change has occurred, notify UDEQ within 7 days of receipt of
the results of the resampling.
Figure 6-1 below summarizes the requirements imposed on the Intermountain Regional Landfill
by UDEQ regulations to define the nature and extent of groundwater contamination and to take
corrective action if the source of the groundwater contamination is the landfill.
FIGURE 6-1
UTAH REQUIREMENTS FOR GROUNDWATER MONITORING
Intermountain Regional Landfill 6-2 Design Engineering Report
6.3 LANDFILL GAS MONITORING
Explosive gas monitoring is completed on a quarterly basis. A handheld multi-gas monitor device
is used to monitor explosive gases. Monitoring locations include the entire waste mound with
particular attention to the working face and the bottom toe as well as enclosed structures such as
the scale house, offices and maintenance shop. If concentrations of explosive gas exceed either
the 25% of the lower explosive limit standard for facility structures or the lower explosive limit at
the property boundary and beyond, IRL will implement mitigation measures so that levels do not
exceed allowable limits.
A Gas Collection and Control System (GCCS) is currently in design and is set to be installed and
operational by February 28, 2022. Expansion of the GCCS will occur in phases as waste is placed.
The operation, inspection and monitoring of the GCCS will comply with the Title V permit and
Utah Division of Air Quality requirements.
Intermountain Regional Landfill 6-3 Design Engineering Report
CHAPTER 7 - CONTINGENCY AND CORRECTIVE ACTION
PLANS
The following sections describe the contingency and corrective action plans that will be
implemented if fire, explosion, failure of run-off/run-on structures, release of explosive gases, or
contamination of groundwater occurs.
7.1 FIRE
No burning of wastes is planned in the active landfill cell area. Limited burning may be planned,
permitted, and accomplished when the construction area for a new landfill cell is cleared and
when perimeter fences and drainage channels are maintained. No other burning activities are
planned at the Intermountain Regional Landfill.
Two other types of fires - fires in loaded vehicles and fires in disposed wastes — must be
anticipated and response activities planned. Each of these is discussed below. The preferred
method of fighting fires in the Intermountain Regional Landfill will be smothering the fire with soil.
Water will contribute to the formation of leachate and should be used only as a last resort if the
fire cannot be smothered.
7.1.1 FIRE IN A LOADED VEHICLE
If a transport vehicle enters the landfill site carrying a burning or smoldering load of waste, landfill
operations personnel will take the following actions.
• Direct the vehicle to a designated section of the landfill away from the working face. Direct
the driver to deposit his load and to clear the area as quickly as possible.
• Immediately cover the burning waste with enough soil to completely smother the fire. Allow
the waste to cool for several days, or longer if necessary.
9

If necessary, spray equipment and the transfer vehicle with water to cool the equipment
while working the fire. This will not be necessary if the equipment is pushing or dumping
soil on the burning wastes in front of the advancing equipment.
• If landfill operations personnel cannot control the fire, contact the County Fire Marshal.
• Notify UDEQ immediately and provide written documentation within 14 days of the fire.
7.1.2 FIRE ON THE WORKING FACE OR BELOW COVER
In the event of a working face fire or a fire below cover, landfill operations personnel will take the
following actions.
• Evacuate all nonessential personnel from the area of the fire. Nonessential personnel
include transfer truck drivers, laborers/spotters, and visitors.
• To the extent possible, isolate the burning material from other wastes. Use compactor
blades and dozers to move the burning materials away from other wastes, this might not
be possible if the fire is below cover soil.
• Immediately cover the burning waste with enough soil or water to completely smother the
fire. Allow the waste to cool for several days, or longer if necessary.
Intermountain Regional Landfill 7-1 Design Engineering Report
• If necessary, spray equipment and the transfer vehicle with water to cool the equipment
while working the fire. This will not be necessary if the equipment is pushing or dumping
soil on the burning wastes in front of the advancing equipment.
• If landfill operations personnel cannot control the fire, contact the County Fire Marshal.
• Notify UDEQ immediately and provide written documentation within 14 days of the fire.
7.2 EXPLOSION
If an explosion occurs at the landfill or in any structure associated with the landfill, landfill
operations personnel will take the following actions:
• Immediately evacuate the area surrounding the explosion, including any adjacent
buildings. Shut down and abandon any equipment near the explosion that is hot and that
could provide an ignition source for additional explosions.
• Account for all personnel Contact the County Fire Marshal and the emergency dispatcher
(911). Contact the General Manager
• Keep people from entering the explosion area until emergency response personnel clear
the area
• Notify UDEQ immediately and provide written documentation within 14 days of the
explosion
7.3 FAILURE OF RON-OFF/RUN-ON STRUCTURES
Failure of run-off structures can allow contaminated water to be released into the environment.
Failure of run-on structures can allow stormwater to mingle with waste and become leachate.
Neither of these conditions is desirable.
7.3.1 FAILURE OF RUN-OFF STRUCTURES
If a failure of run-off structures is discovered during routine or non-routine inspections, landfill
operations personnel will take the following actions.
• As soon as practical, suspend acceptance of wastes at the landfill, if necessary, and inform
customers of this suspension
• Use landfill compactor and dozer equipment to construct temporary berms to contain the
run-off. Divert the flow of run-off water away from surface water drainage ditches.
• Resume landfilling operations as soon as possible after the run-off is contained. Inspect
the temporary berms at least once every 2 hours.
• Assess the impact of the release of run-off as soon as practicable following the event.
Assess the need for permanent improvements in temporary berms, or other run-off control
structures, as soon as practicable after the run-off is controlled.
• Notify UDEQ immediately and provide written documentation within 14 days of the failure.
7.3.2 FAILURE OF RUN-ON STRUCTURES
Failure of run-on control structures can temporarily overload the leachate collection system but is
generally less serious than failure of run-off control structures. If failure of run-on control structures
is discovered during routine or non-routine inspections, landfill operations personnel will take the
following actions.
Intermountain Regional Landfill 7-2 Design Engineering Report
• Immediately mobilize landfill compactor or dozer equipment to construct temporary
berms, swales, or other structures to temporarily divert surface.
• Water run-on from the active landfill cell. Assess the need to suspend acceptance of
waste.
• As soon as practicable, assess the need for permanent run-on control structures
• Notify UDEQ immediately and provide written documentation within 14 days of the
failure.
7.4 RELEASE OF EXPLOSIVE GASES
It is unlikely that explosive gas will be released from the Intermountain Region Landfill. However,
it is possible that landfill gas concentrations will exceed the regulatory requirements in one or
more gas-monitoring locations during the life of the landfill. For the purpose of this contingency
plan, a release is defined as the detection of more than 25% of the lower explosive limit (LEL) in
a landfill building, or more than 100% LEL at the property boundary. The LEL is 5% by volume of
methane in the air. If a release of explosive gases is detected, landfill operations personnel will
take the following actions.
• Immediately suspend landfilling operations and determine if landfill personnel or structures
are threatened. If so, evacuate personnel immediately and open building doors to allow
gases to escape.
• As soon as possible, determine if off-site buildings or other structures are threatened. If
so, immediately notify the County Fire Marshal.
• Monitor the release area, and all other landfill gas monitoring locations, until the
emergency condition has been eliminated.
• Determine temporary corrective actions as soon as possible, and permanent corrective
actions as soon as practicable, after detection of the release.
• Notify UDEQ immediately and provide written documentation within 14 days of the release
event.
7.5 GROUNDWATER CONTAMINATION
Contingency and corrective actions plans will be developed after groundwater contamination
is detected. Refer to Figure 6-1 for the required workflow.
Intermountain Regional Landfill 7-3 Design Engineering Report
CHAPTER 8 - CONTROL OF NUISANCE CONDITIONS
8.1 FUGITIVE DUST
Fugitive dust from the working area will be controlled by timely placement of daily,
intermediate, or final cover. Haul roads will be maintained by maintaining positive drainage
and removing excessive trackout on paved roads within the property boundary and on
entrance roads. Sprayed water or a dust palliative will be applied if operators notice that dust
is migrating off-site. Disturbed areas not immediately needed for landfill operations will be
revegetated if they are causing excessive dust.
8.2 LITTER
The methods to reduce litter in and near the Intermountain Regional Landfill include the
following:
. Intermountain Regional Landfill will encourage customers to deliver in covered loads.
Potential methods include placing signs along the main road to the landfill, a scaled
pricing structure for self-haul customers (uncovered loads will be charged more), and
educational campaigns, if needed due to complaints. Commercial vehicles will be
required to deliver only covered loads.
4,

Operators will minimize the working face. This will reduce the waste surface are that
is exposed to wind and reduce the potential for winds to transport of the active Cell.
• Operators will placement of daily cover as soon as practical
. Mobile litter control fencing will be placed near the working face to capture as much
windblown litter as possible.
. Active cleanup of windblown litter will be conducted within the property boundary as
part of the daily operation. Periodically, Intermountain Regional landfill operators will
inspect adjacent properties for litter that has migrated offsite.
• Intermountain Regional Landfill will maintain the 6-foot perimeter fencing in good
repair and pick-up trash that has collected on the fence.
8.3 RODENT CONTROL
The primary method of rodent control is to eliminate conditions favorable for the reproduction
of rodents through properly compacting wastes and placing daily cover. If landfill personnel
see signs of rodents, more-frequent application of soils will be considered.
If the primary method of rodent control does not produce satisfactory results, the landfill
operators might use poisoning. A poison control program must include the following
conditions:
• Poison traps must be set by experienced, professional exterminators.
• Poison traps may be set only within areas of controlled access. This means the
trapped area must be within the site's security fencing, and the security gates must be
locked for the duration of the poisoning program whenever landfill personnel are not
on-site.
• The Occupational Health and Safety Administration (OSHA) requires warning signs of
acceptable color and size to be permanently fixed to the outside of the access gate
Intermountain Regional Landfill 8-1 Design Engineering Report
and fencing, at spacings not to exceed 150 feet, for the duration of the poisoning
program. A minimum of one sign per side of the fence is required.
• Landfill personnel must conduct a daily inspection of each poison trap and must notify
the professional exterminator if disruptions of any traps are noted.
• The professional exterminator must conduct periodic inspections of the poison traps.
• Written documentation of the poisoning program must be maintained at the
maintenance building. The documentation must include the number and exact
location(s) of the poison traps, the name of the poison(s) (including both chemical and
brand name and a list of ingredients), the quantity of poison contained in each trap,
and the medically accepted antidotes or treatments for the poison(s).
• The professional exterminator must submit monthly reports to the Operations Manager
documenting the status of the poisoning program. The reports shall include the number
and location of traps, the quantities of poison(s) used during the past month, and any
changes in the program instituted during the past month.
• Poison supplies shall be stored on-site in a separate, locked, and properly labeled
enclosure. Access to the poison shall be restricted to the professional exterminator,
the general manager, or his designee.
8.4 BIRD CONTROL
As with rodent control, the primary method of controlling birds is to control the conditions
favorable to their existence. The following methods will be used as needed:
• Minimize the size of the working face. This is the most effective method of controlling
birds, since it reduces the area available for feeding. More-frequent cover and greater
compaction of the waste can also minimize the opportunities for feeding.
• Minimize the accumulation of water in depressions, ponds, or other features near the
active working face. The lack of water makes a landfill a less attractive feeding area
for birds.
• Use noise or other frightening techniques. These techniques cause a short-term
reduction in the number of birds feeding at a landfill.
lf the primary methods do not produce satisfactory results, a destructive method of control
might need to be implemented. Destructive methods could cause harm or death to some birds,
and authorization must be obtained from local officials before implementing a destructive
program.
intermountain Regional Landfill 8-2 Design Engineering Report
CHAPTER 9 ALTERNATIVE WASTE-HANDLING
PROCEDURES
An all-weather road exists from the site entrance to the active cell. In the semi-arid climate of the
Intermountain Regional Landfill site, experience has shown that precipitation has only a minor
effect on the operation of the landfill. The owner does not believe that alternate waste-handling
plans are necessary for the site to handle wet weather operations.
All reasonable caution and prudence will be exercised to not dispose of wastes during any
unreasonable weather conditions. If unforeseen weather conditions occur, the Operations
Manager, or his designee, will be informed and will coordinate any changes in operations. The
Operations Manager will consider the system-wide requirements in determining what changes, if
any, need to be made to operations at the landfill.
Intermountain Regional Landfill 9-1 Design Engineering Report
CHAPTER 10 MONITORING PROCEDURES
10.1 GENERAL
The inspection schedule for groundwater monitoring wells and landfill gas monitoring stations
is presented in Chapter 6, Inspections, Monitoring, and Reporting. The following section
describes the more-detailed inspection and maintenance of these proposed landfill monitoring
features.
10.2 GROUNDWATER MONITORING WELLS
All groundwater monitoring wells will be thoroughly inspected during each sampling event.
The detailed inspections will note signs of deterioration or failure of the protective steel casing,
the concrete pad and bollards, and the polyvinyl chloride (PVC) well casing and screen. lf
damage is discovered, the nature of the problem will be recorded and reported to the
Operations Manager, who will make a decision to repair, replace, or abandon the well. This
decision will be documented in the operating record for the landfill, and the required actions
will be completed before the next scheduled monitoring event.
The monitoring well locations will be maintained on a routine basis. Weeds will be removed
at least every 6 months, about 2 weeks before each scheduled sampling event. During the
weed removal, landfill personnel will note any obvious indications that the well has been
damaged in order to allow the Operations Manager to assess the situation.
10.3 GAS MONITORING LOCATIONS
Explosive gas monitoring locations generally include strategic areas around the waste mound,
including the working face and bottom toe, as well as all structures on the property. The
exterior access road around the facility is also monitored.
Gas monitoring locations for the GCCS are not yet established but will be determined once
the system is operational. Monitoring locations will also be modified to meet site specific
conditions as the landfill and GCCS expands. Regularly scheduled monitoring will occur as
well as additional monitoring at installation and start-up of each phase of the GCCS to meet
air quality requirements.
intermountain Regional Landfill 10-1 Design Engineering Report
CHAPTER 11 - WASTE-SCREENING PROCEDURES
All vehicles entering the site will be stopped at the scale house. Scale attendants will inquire about
the contents of the waste entering the site. lf a customer is suspected to be carrying unacceptable
materials, they will be turned away and directed to an appropriate facility that is permitted to
receive the waste materials. After a vehicle leaves the scale, they are directed to the working
face. Wastes unloaded at the tipping face will be inspected regularly by landfill operators trained
to identify unacceptable materials. All personnel will receive periodic training in detecting wastes
that are prohibited for disposal at the landfill. This training will consist of an initial training and
annual refresher training. These personnel will conduct routine inspections and random load
inspections.
Loads will be selected randomly for a more detailed inspection to detect illegal or inadvertently
deposited materials. A location for waste screening will be designated on the active landfill cell.
For more detailed random inspections, an unsuspecting collection or transfer vehicle will be
directed to a waste screening area near the working face to unload. After being unloaded, waste
will be spread with a dozer or compactor, or a 1-to-2-foot thickness, so that the majority of the
load can be visually inspected. Information will be recorded on the general contents of the load
as well as customer.
The Operations Manager will notify the Director of the Division of Waste Managernent and
Radiation Control with the material type and quantity and the remedial actions taken for
unacceptable waste. The Conditional Use Permit (Permit Application Appendix B) specified the
following 11 categories of Unacceptable Waste.
• 'Hazardous waste' as defined in 40 CFR part 261, as such part may be amended and
expanded from time to time, and in Utah Code Section 19-6-102(9) and the regulations
promulgated there under as they may be amended and expanded from time to time,
• Any material that is now or hereafter defined by applicable Federal, State or Local
Laws, regulation, or ordinance as radioactive, toxic, hazardous or extremely
hazardous waste, excluding household hazardous waste and small quantity generator
hazardous waste,
• Vehicle tires in excess of the amount of such tires permitted to be disposed of by
applicable Federal, State or Local law, regulation, or ordinance,
• Lead acid batteries,
• Soils contaminated with hazardous, radioactive, or toxic wastes, or hazardous or toxic
substances as such terms are defined by applicable Federal or State law or
regulations,
• Asbestos, including the asbestiform varieties of serpentine (chrysolite), riebeckite
(crocidolite), cummingtonite-grunerite, anthophyllite and actinolite-tremolite,
• Any material which contains asbestos ("ACM"), including asbestos waste from control
devices, contaminated clothing, asbestos-waste material, materials used to enclose
the work area during asbestos project, or bags or containers that previously contained
asbestos,
• Dead animal carcasses in excessive amounts that will attract disease vectors,
• Any soils from coal mine sites, power plants, rail yards, and other industrial
development sites and projects which may be removed as part of any voluntary or
governmentally mandated environmental remediation plan or program,
• Infectious waste, medical waste, or sharps, and
Intermountain Regional Landfill 11-1 Design Engineering Report
• Any material whatsoever that the Permit or any Federal, State, or Local law, regulation,
or ordinance may prohibit for disposal at the Landfill now or in the future. Any future
prohibition shall not operate retroactively, however, as any material previously
determined to be Acceptable Waste and disposed of at the Landfill shall not be a
breach of updated regulations.
intermountain Regional Landfill 11-2 Design Engineering Report
.
CHAPTER 12 - TRAINING PROGRAM
Landfill personnel will be trained according to the duties required by certain job categories.
Training records will be submitted with annual landfill reports. In general personnel will receive
one or more of the following:
• 'Hazardous Waste Operations and Emergency Response, pursuant to requirements
of the Occupational Safety & Health Administration (OSHA)
• OSHA Safety Training
• First Aid Training
• Solid Waste Association of North America (SWANA) Manager of Landfill Operations
(MOLO), which includes waste screening, leachate and gas management, and general
information on landfill regulations.
Intermountain Regional Landfill 12-1 Design Engineering Report
APPENDIX A
Inspection Form
INSPECTION REPORT
Type of Inspection Daily / Weekly / Monthly / Quarterly / Semiannually (circle one)
Performed by Date
Overall Condition
Satisfactory Comments or Corrective Action Needed
Yes / No
Structures & Roads
Fences & Gates'
Signagel
Access Roads'
Run-on Control'
Dust Control'
Landfill Operations
Litter Control'
Protective Cover'
Daily Cover'
Intermediate Cover2
Final Cover"
Equipment'
Runoff Control'
Active Working Face'
Vector Control'
Leachate System'
Weed Control'
Monitoring Wells"
Leachate Pond2
* Specify the work needed and the timeframe for completion
Key 1 = daily, 2 = weekly, 3 = monthly, 4 = quarterly, 5 = semiannually
Additional Comments
Material Present?Comment
Hazardous Waste/Materials Y / N
PCB Materials Y / N
Liquid Wastes Y / N
Batteries Y / N
Flourescent Bulbs Y / N
Tires Y / N
Aerosal Cans Y / N
Oily Rags, Used Sorbent Materials Y / N
Appliances, Computer Components Y / N
Pesticides Y / N
Asbestos Containing Materials Y / N
Shingles/Asphalt Y / N
Other Y / N
Hauler:_________________________TK#__________
Origin:_________________________
Inspector:______________________________________________Date:_____________________________
Signature:______________________________________________
Comments: ________________________________________________________________________________________
___________________________________________________________________________________________________
___________________________________________________________________________________________________
___________________________________________________________________________________________________
Intermountain Regional Landfill
Load Inspection Form
Date Commercial MSW Residential Loads Total Tonnage Yes No Deviations from Operational Plan?Initial
0.00
0.00
0.00
0.00
0.00
0.00
Total 0 0 0.00
Notes:_________________________________________________________________________________________________________
_________________________________________________________________________________________________________
Signature:________________________________________
Alternate Daily Cover?
Daily Operational Record
Attachment 2 - Closure and Post-Closure
Cost Estimates
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Item Unit Unit Cost
Quantity
For Total
C&D Site
Total Cost
(2023 dollars)
Topo Survey Initial (Drone)LS $6,069 1 $6,069
Topo Survey Final (Drone)LS $3,423 1 $3,423
Site Reconnaissance hr $163 18 $2,934
Boundary Survey hr $175 24 $4,200
Construction Plans/Specs LS $57,200 1 $57,200
Bidding and Award LS $6,600 1 $6,600
Quality Control Testing LS $10,000 1 $10,000
Construction Management/QA/QC LS $154,171 1 $154,171
Closure Report/As-Builts LS $30,000 1 $30,000
Obtain UPDES and other permits LS $16,000 1 $16,000
$290,597
Final Waste Grading SY $1.70 197,472 $335,702
Placement of Initial Cover CY $5.00 98,736 $493,680
Placement of Final Cover CY $5.00 98,736 $493,680
Seeding Acre $1,600 41 $65,280
Dust Control (water)Loads $100 79 $7,899
Storm Drainage (Pipes, Concrete Structures)LS $50,000 1 $50,000
$1,446,241
Post Closure Plan LS $15,000 1 $15,000
Site Insepction and Recordkeeping quarterly yr $2,500 120 $300,000
Correctional Plans and Specs annual yr $2,000 30 $60,000
Site Monitoring Semiannually yr $2,500 60 $150,000
Maintenance Costs yr $15,000 30 $450,000
$72,649
$361,560
$243,750
$363,246
$1,807,802
$1,218,750
$169,490
$3,559,288
Closure costs were based on closing the complete site. Financial Assurance is only required for that
portion of the area that is open and operating (without final cover). Therefore, the totals provided
can be adjusted by applying a multiplier of the area that is open and operating divided by the total
Post Closure Contingency - 25%
Financial Assurace Cost Estimate Total for C&D Cell
Construction Total
Post Closure Total
Legal/Oversight Contingency - 5%
Engineering Total
Intermountain Regional Landfill
Worst Case Closure and Post-Closure Maintenance and Care
Financial Assurance Cost Estimate - Construction and Demolition Cell
Engineering Contingency - 25%
Construction Contingency - 25%
Post Closure Total $975,000
Engineering
Construction
Post Closure
Engineering Total
Construction Total
Attachment 3
Groundwater Monitoring

Intermountain Regional Landfill 4-1 IRL Permit Modifications
CHAPTER 4 - GROUNDWATER MONITORING WELL
NETWORK

BACKGROUND
The current groundwater monitoring well network, as laid out under the groundwater monitoring
plan (GMP), consists of upgradient well DMW-1, and downgradient wells DMW-2, DMW-3, DMW-
5, DMW-6, DMW-7, and DMW-8 as shown in Attachment 4. A temporary monitoring well, TMW-
1, was present in early monitoring reports but has since been abandoned as landfill Cell 1 has
grown. The current GMP is the HDR Groundwater Monitoring Plan, dated August 2010 (HDR
Engineering, Inc., 2010a).

DMW-2 was intended to be the compliance well for the leachate pond (not constructed yet); DMW-
3 was intended to be the downgradient well for Cell 1; DMW-4 was to be for Cell 2; DMW-5 was
to be for Cell 3 and part of Cell 4; DMW-6 was to be for Cell 5 and part of Cell 4; and DMW-7 was
to be for Cell 6. Since 2010, the number of designed cells has been consolidated from six to three
and DMW-4 through DMW-7 were instead numbered DMW-5 through DMW-8. DMW-3 now
corresponds to Cell 1; DMW-5 and 6 now correspond to Cell 2; and DMW-7 and DMW-8 now
correspond to Cell 3. In recent monitoring events, only DMW-1 through DMW-3 and DMW-5 have
been sampled and statistically analyzed.

The groundwater flow vector is believed to be south southeast at 0.0039 ft/ft (Hansen, Allen, &
Luce, Inc., 2023). However, most of the wells are in a straight north/south line (Attachment 4)
which makes determining the true groundwater direction difficult (i.e., measuring movement in a
three-dimensional plane with only a two-dimensional observation). Groundwater contours back to
2020 are shown in Attachment 4 and have been very stable.

PROPOSED GROUNDWATER MONITORING WELL NETWORK
The proposed groundwater monitoring well network is shown in Attachment 4. The replacement
DMW-1 upgradient well will be moved north to the other side of the road and slightly west about
80 feet. According to UARC R315-311-2(1)(a), replacement of a well is considered a minor
modification if the location is not changed. In the scale of the landfill area, HAL’s professional
opinion does not consider the 80-foot shift to be significantly different. HAL proposes to collect
four independent samples at the replacement DMW-1 well in the next semi-annual monitoring
event in accordance with 40 CFR 258.54(b) and one sample at the existing DMW-1 and check the
relative difference in the constituents. If the relative comparison shows significant differences,
the first monitoring will be followed by quarterly monitoring until eight total background samples
are achieved. Unless proven to have signficant differences, HAL proposes to include the existing
DMW-1 background samples in the replacement DMW-1 historical background.

DMW-2 was to be the compliance well for a future leachate pond, but the C&D cell proposed in
Attachment 3 eliminate the leachate pond. Therefore, it is proposed that DMW-2 be removed and
not replaced. This change represents a major modification subject to public comment.

The new wells on the west and south sides would be monitored only for water level to more
effectively determine the groundwater direction of flow and head gradient. If the new wells reveal
a change in the direction of flow and head gradient from the previous understanding of the
hydrogeology, IRL may need to submit a permit modification to designate one of the new wells

Intermountain Regional Landfill 4-2 IRL Permit Modifications
as the new upgradient well, rather than the new DMW-1 well. In this case, the monitoring scheme
described herein would transfer to the new upgradient well and restart if necessary. If a change
in the compliance wells is thought to be necessary owing to new understanding of hydrogeology,
then a separate permit modification will be submitted.

GROUNDWATER MONITORING PLAN
The sampling and analysis procedures in the current GMP written by HDR Engineering, Inc.,
(2010) would continue to be used as written for sampling and analysis of all compliance and
upgradient wells. The only changes to the GMP are those required to show the updated well
network.

#*
")
")
")")")
DMW-7, no data DMW-8, 4769.81DMW-5, 4788.53DMW-3, 4791.32
DMW-2, 4794.72
DMW-1, 4799.88
DMW-6, 4785.16
4
7
9
5
4790
4
7
8
5 4
7
7
5
4
7
8
0
4
7
7
0
DMW-1
DMW-9
DMW-13 DMW-11DMW-12
DMW-10
DMW-14
Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community
Intermountain Regional Landfill Existing and Proposed Groundwater Monitoring Wells
0 500 1,000250 Feet
¦
Document Path: H:\Projects\373 - Intermountain Regional Landfill\02.200 - C&D Cell, ET Cover and Mound Redesign Permit Modification\GIS\Base Monitoring Well Map.mxd
Date: 12/5/2023
Legend
Monitoring WellsHead ContoursProperty BoundaryProposed Wells
")Potential Piezometer
#*Proposed Piezometer
Proposed Replacement
Remove withoutreplacement
0.0039 f
t
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DMW-1
SITE ENTRANCE
PROPERTY LINE
CELL 3
PHASE 1F PHASE 1E
PHASE 1B
PHASE
1DPHASE
1CPHASE 1A
CELL 1
SOIL
STOCKPILE
AREA
DMW-3 DMW-5 DMW-6 DMW-7
DMW-8
CELL 2
DMW-2
DMW-1
PHASE 1G
PHASE 1H
4
,
7
9
2
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4,
7
8
4
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4,
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8
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4,
7
7
6
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4,7
7
2
'
4
,
7
9
6
'
4,7
6
8
'
4,796.86'
4,791.70'
4790.98'4786.06'4,782.61'
4,767.43'
4,
7
8
8
'
136 Pecan Street, Keller, TX 76248
FIGURE:
DATE DRAFTED:
FILENAME:I:\UTAH\Intermountain\Contour Maps\2022\2022 2nd SA CONTOUR MAPS.dwg
1
December 7, 2022 REV. NO.:
DESIGNED BY:
APPROVED BY:
DRAWN BY:
CHECKED BY:
GROUNDWATER CONTOUR MAP
NOVEMBER 2022
INTERMOUNTAIN REGIONAL LANDFILL
UTAH COUNTY, UTAH
N
0 500250
FEET
SCALE:
LEGEND:
NOTE:
1. BASE MAP WITH TOPOGRAPHIC CONTOURS AND LANDFILL CELL FEATURES PROVIDED BY
HANSEN, ALLEN & LUCE INC., SOUTH JORDAN, UTAH.
2. GROUNDWATER MONITORING WELL LOCATIONS PROVIDED BY HANSEN, ALLEN, & LUCE INC.,
SOUTH JORDAN, UTAH.
3. TOP OF CASING ELEVATIONS WERE SURVEYED MARCH 2015.
4. WATER LEVELS MEASURED NOVEMBER 16-17, 2022.
5. N/A - WATER LEVEL NOT MEASURED.
PROPERTY LINE
MONITOR WELL
WDS
WDS
KTC
FENCE
GROUNDWATER CONTOUR
WDS
01/19/2023
DMW-1
SITE ENTRANCE
PROPERTY LINE
CELL 3
PHASE 1F PHASE 1E
PHASE 1B
PHASE
1DPHASE
1CPHASE 1A
CELL 1
SOIL
STOCKPILE
AREA
DMW-3 DMW-5 DMW-6 DMW-7
DMW-8
CELL 2
DMW-2
DMW-1
PHASE 1G
PHASE 1H
4
,
7
9
2
'
4,
7
8
8
'
4,
7
8
4
'
4,
7
8
0
'
4,
7
7
6
'
4,7
7
2
'
4
,
7
9
6
'
4,7
6
8
'
4,797.15'
4,791.97'
4791.24'4786.33'4,782.88'
4,767.73'
136 Pecan Street, Keller, TX 76248
FIGURE:
DATE DRAFTED:
FILENAME:I:\UTAH\Intermountain\Contour Maps\2022\2022 CONTOUR MAPS.dwg
1
September 27, 2022 REV. NO.:
DESIGNED BY:
APPROVED BY:
DRAWN BY:
CHECKED BY:
GROUNDWATER CONTOUR MAP
MAY 2022
INTERMOUNTAIN REGIONAL LANDFILL
UTAH COUNTY, UTAH
N
0 500250
FEET
SCALE:
LEGEND:
NOTE:
1. BASE MAP WITH TOPOGRAPHIC CONTOURS AND LANDFILL CELL FEATURES PROVIDED BY
HANSEN, ALLEN & LUCE INC., SOUTH JORDAN, UTAH.
2. GROUNDWATER MONITORING WELL LOCATIONS PROVIDED BY HANSEN, ALLEN, & LUCE INC.,
SOUTH JORDAN, UTAH.
3. TOP OF CASING ELEVATIONS WERE SURVEYED MARCH 2015.
4. WATER LEVELS MEASURED MAY 17-18, 2022.
5. N/A - WATER LEVEL NOT MEASURED.
PROPERTY LINE
MONITOR WELL
CMT
CMT
WDS
FENCE
GROUNDWATER CONTOUR
09/30/2022 WDS
DMW-1
SITE ENTRANCE
PROPERTY LINE
CELL 3
PHASE 1F PHASE 1E
PHASE 1B
PHASE
1DPHASE
1CPHASE 1A
CELL 1
SOIL
STOCKPILE
AREA
DMW-3 DMW-5 DMW-6 DMW-7
DMW-8
CELL 2
DMW-2
DMW-1
PHASE 1G
PHASE 1H
4,797.88'
4,792.35'
4791.51'4786.53'4,783.08'
4,767.91'
4
,
7
9
2
'
4,
7
8
8
'
4,
7
8
4
'
4,
7
8
0
'
4,
7
7
6
'
4,7
7
2
'
4
,
7
9
6
'
4,7
6
8
'
136 Pecan Street, Keller, TX 76248
FIGURE:
DATE DRAFTED:
FILENAME:I:\UTAH\Intermountain\Contour Maps\2021\2021 CONTOUR MAPS.dwg
1
July 1, 2021 REV. NO.:
DESIGNED BY:
APPROVED BY:
DRAWN BY:
CHECKED BY:
GROUNDWATER CONTOUR MAP
MAY 2021
INTERMOUNTAIN REGIONAL LANDFILL
UTAH COUNTY, UTAH
N
0 500250
FEET
SCALE:
LEGEND:
NOTE:
1.BASE MAP WITH TOPOGRAPHIC CONTOURS AND LANDFILL CELL FEATURES PROVIDED BY
HANSEN, ALLEN & LUCE INC., SOUTH JORDAN, UTAH.
2.GROUNDWATER MONITORING WELL LOCATIONS PROVIDED BY HANSEN, ALLEN, & LUCE INC.,
SOUTH JORDAN, UTAH.
3.TOP OF CASING ELEVATIONS WERE SURVEYED MARCH 2015.
4.WATER LEVELS MEASURED MAY 11-12, 2021.
5.N/A - WATER LEVEL NOT MEASURED.
PROPERTY LINE
MONITOR WELL
WDS
CMT
KTC
FENCE
GROUNDWATER CONTOUR
Attachment 4
Construction and
Final Cover Design
INTERMOUNTAIN REGIONAL LANDFILL
2023 PERMIT MODIFICATION DRAWINGS
NIG SREENE
DECEMBER 2023
CEDAR

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Intermountain Regional Landfill 2-1 ET Cover Design Engineering Report
CHAPTER 2 – ET COVER DESIGN

This chapter presents the general layout and design concept of the increased mound height and
ET cover. References to the permit drawings in Attachment 1, geotechnical report in Attachment
6, the original geotechnical report completed by EarthTec in Appendix A, the original slope
stability and settlement analysis completed by HDR in Appendix B, and calculations provided in
Appendices C, D, and E should be noted throughout this chapter.

GENERAL LAYOUT AND DESIGN
The original design of the landfill was completed by HDR, Inc. and presented in a design
engineering report dated November 2010 that was included in the permit application as Part 3.
The original capacity of the facility was listed as 27 million cubic yards. This design was modified
by HAL in 2016 and is included in the current permit, which increased the overall capacity to 28.9
million cubic yards. The currently permitted waste mound design reaches a maximum height of
roughly 100 feet above existing topography (Jones, 2020).

This permit modifications proposes an increase to the overall height and capacity of the facility.
This design change resulted following approval from Fairfield City to allow for an additional 100
feet above existing topography within the facility's conditional use permit as shown in the drawings
in Attachment 1. The design modification increases the maximum height to roughly 200 feet above
existing topography but maintains the previous horizontal footprint. The overall capacity above
the protective soil cover material placed above the lining system is about 46.8 million cubic yards,
more than the previous design. Therefore, changes to the hydrology and stormwater design in
addition to the change in cover system are needed.

The current design for the final cover calls for installation of HDPE 60 mil liner after soil grading
of the intermediate cover, a 1.5 feet final cover, 0.5 feet topsoil, and temporary watering to
establish vegetative cover. This design is accepted as the “standard design” (R315-303-3(4)(a)).

The final waste mound with the overlying layers of daily cover material provides the subgrade for
the final closure system. To implement the ET cover, it is proposed that the intermediate cover,
synthetic liner, 1.5 feet final cover, and 0.5 feet topsoil and revegetation be replaced with 2.7 feet
final cover and revegetation. The sub-surface perforated drainage pipe system would also be
removed. The 2.7 feet of cover material includes soil fill and an erosion protection layer consisting
of native vegetation. Further discussion of the erosion protection measures is provided below.

The new overall shape and design consists of waste mounding and the overlying closure cap
extending up on a 4H:1V slope from the top of the floor embankment slopes around the perimeter
of the landfill area. An intermediate bench (25 feet wide) is designed into the 4H:1V slopes to
provide intermediate stormwater collection and conveyance necessary for erosion protection on
the slopes around the facility. The waste mound and closure cap rise to an elevation of about 200
feet above the top of the west cut slope. The north, south and east slopes extend upward on
4H:1V slopes from the top of the incised embankments to intersect with the top surface as it
extends east on the 2 percent slope. Attachment 1 shows the new shape of the final waste mound
and cover.