This document discusses Griffin's expertise in dewatering and groundwater control since 1934. It provides information on Griffin's pumps and equipment, filtration and treatment systems, engineering capabilities, and approach to ash pond dewatering projects. Griffin offers customized solutions including modeling, design, installation of dewatering systems, pumps, filtration and operation/maintenance to lower water levels and allow for safe excavation of coal ash.

1. Groundwater Control Since 1934
Coal Ash Dewatering Solutions
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2. Groundwater Control Since 1934
WE ARE GRIFFINDewatering
Griffin has provided service and
equipment to the construction
dewatering and groundwater pumping
market since 1934 gaining the respect of
Griffin’s clients by solving their
groundwater problems.
Pumps & Equipment
Griffin Pump has over 80 years
experience in manufacturing innovative
equipment that is a direct result of field
experience.
Filtration and Treatment
Griffin offers treatment systems for any
application using the appropriate
technologies to best treat the water on
our client’s jobsite.
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3. Griffin Dewatering has the engineering capabilities, the experienced personnel and
the wide range of equipment and services needed to handle complex dewatering
challenges. 3

4. Mission Statement
Founded in 1934, Griffin Dewatering is the leader in dewatering and
groundwater control. We are guided by an unwavering
commitment to our core values and we aim to lead the dewatering
and groundwater control industry through a continual improvement
process, leading to our profitable growth.
We diligently cultivate relationships with clients to help determine
their dewatering, groundwater control and pumping related
needs, tailor an engineered cost–effective, first–class solution to
meet the needs and deliver the solution in a safe, timely,
courteous and professional manner. We recognize that our past
and future success heavily relies on the efforts of our empowered,
knowledgeable, experienced, dedicated and valued employees.
We constantly strive to build lasting relationships with our clients
and stakeholders through integrity, respect and performance
providing a solid foundation for all of our projects.
Your Partner in Groundwater Control
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5. Core Values
• Integrity
We know and do what is right. We follow rules and procedures, are honest, keep our commitments,
and continually give our best effort, while treating each other and our clients with dignity and
respect.
• Empowered
We are diligent leaders who encourage people to reach their potential. We attract, develop and
retain the best talent for our business. We create exciting opportunities for ourselves and our
clients by growing intellectually.
• Safety
We strive to be accident free. We will not compromise our health and safety. We will provide a safe
work environment through proactive training, focus, and recognition. Our health and welfare is
critical to our success. We look out for ourselves and others.
• Accountability
We take responsibility for our own actions and measure our success by our clients' success. We
promote accountability through honest, open and professional communication, resulting in great
relationships and teamwork.
• Quality
We provide outstanding products and unsurpassed service that, together, deliver premium value to
our customers. Our actions and personal standards reflect our mission of being the best dewatering
and groundwater control company. We focus on delivering desired results within established
timeframes.
Your Partner in Groundwater Control
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6. Coal Combustible Residuals: Challenges and
Solutions to Dewatering and Disposal
• Fly ash has low/no compressibility
• Stabilization of fly ash for dry excavation results from
reduction of pore water pressure, thus increasing cohesion
• Key success factors for excavation dewatering:
• Field permeability testing of fly ash in situ
• Proper engineering analysis of permeability, flow conditions and
expected drawdown
• High intensity of dewatering by using closely spaced wickpoints that
operate without disruption
• Preventing recharge from aquifers or runoff
• Effective filtration/treatment of discharged water
Ash Pond Dewatering
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7. Lowering the water content of ash
pond materials by pre-drainage
increases coal ash cohesion and
stability.
This allows for vertical cuts to be made
for large scale excavation with
conventional excavation equipment.
The primary methods of ash pond
dewatering are:
• Wickpoints
• Deep Wells
• Well Points
• Eductors
• Sumping
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8. Three Distinct Sources of Water
Ash Pond Dewatering
• Impounded/free water which lies on top of the ash and comes from precipitation and/or sluicing.
• Groundwater which may intrude into the bottom of the ash.
• Interstitial water which lies in the pore spaces of the ash.
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Staging between the 3 pumping systems is a key factor in preventing the potential for leachate
entering the groundwater.

9. Groundwater Control Since 1934
Kingston Fossil Plant Ash Pond, Kingston NC
Coal Combustible Residuals: Griffin’s Approach to
Engineered Dewatering Solutions for Ash Pond Excavations
• Groundwater Modeling
• Engineering and Design
• Dewatering Systems
• Pumps and Equipment
• Filtration and Treatment
• Maintenance and
Operation
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10. SEEP 2D
Griffin utilizes two dimensional
seepage analysis in order to
calculate the flow lines, constant
head lines and water table for
specific projects like dam seepage
and cutoff wall dewatering.
Using MODFLOW helps analyze the 3D models
for the dewatering system. The cone of
depression resulting from dewatering can be
simulated and shown in 3D view. The flowrate
required for drawdown at each jobsite can be
estimated for each well location.
MODFLOW
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Modeling is used to develop a cost–effective plan to manage the 3 water sources

11. • Dewatering Systems Design (Permanent
and Temporary)
• Aquifer Testing (Pumping Tests and
Slug Tests)
• Uplift Pressure Calculation / Relief Well
Design
• Recharge Well Design
• Dewatering Submittals
• Developing Dewatering Specifications
Soil stratigraphy, using GMS Borehole
Module, based on the available borehole
data. Case study: Treatment Facility in
Norfolk, VA
Engineering and Design
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12. Ash Pond Dewatering
Three Part Solution
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Staging between the 3 pumping systems is a key factor in preventing the potential for
leachate entering the groundwater. Treatment of all water sources is part of the
Griffin solution.

13. SilterMops for free
water pumping
Dewatering Systems
• Geotextile filter assembly
• Tailored to site conditions
• Suspended solids control
• Coupled with reliable
Griffin pumps
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Pumps and Equipment

15. Full Line of Dewatering and Treatment
Systems
Dewatering Systems
• Deep Well Systems
• Wellpoint/Wickpoint
Systems
• Eductor Systems
• Open Pumping/
Sumping
• Filtration and
Treatment
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16. Wellpoints Deep Wells
Eductors Wickpoints
Dewatering Systems
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17. • Installed in the ash to remove the
interstitial water
• Grid pattern due to low
permeability of ash
• Results in stable ash
• Griffin wickpoints are constructed
using formed polystyrene core with
a nonwoven spun bonded filter
fabric
• The core provides an uninterrupted
path for water to flow
Wickpoint System
Dewatering Systems
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18. The right equipment for the job
Dewatering Systems
• Griffin trained crews
• Men, materials, methods
and machines tailored to
the project
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19. Filtration and Treatment
Griffin has extensive experience treating groundwater and offers field tested
solutions and equipment for our client’s water treatment requirements.
Griffin offers systems to address
standard groundwater issues
such as:
• Total suspended solids
• Nuisance mineral removal
(Iron, manganese, etc.)
• Hardness
• pH
• Hydrogen sulfide
• Heavy metal removal
• Radium
• Radon
• VOC contamination 19

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Maintenance and Operation
Griffin has available specialists trained
to operate, maintain, and repair a wide
range of dewatering and treatment
systems and equipment.
Griffin’s core
dewatering business,
includes construction,
dewatering, systems
integration, operation
and maintenance.

21. Kingston Fossil Plant
Ash Recovery Project
Tennessee Valley
Authority
2012
Case Study
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Griffin was
contracted to lower
water in ash more
than 10’, creating a
stable working
platform and
allowing a barrier
wall to be
constructed.

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23. Please visit our website for more details at:
www.griffindewatering.com
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