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Groundwater Control Since 1934

Coal Ash Dewatering Solutions

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Groundwater Control Since 1934

WE ARE GRIFFINDewatering Griffin has provided service andequipment 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 TreatmentGriffin offers treatment systems for any

application using the appropriate

technologies to best treat the water on

our client’s jobsite.

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Griffin Dewatering has the engineering capabilities, the experienced personnel and

the wide range of equipment and services needed to handle complex dewatering

challenges. 3

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Mission Statement

Founded in 1934, Griffin Dewatering is the leader in dewatering andgroundwater control. We are guided by an unwaveringcommitment to our core values and we aim to lead the dewateringand groundwater control industry through a continual improvementprocess, leading to our profitable growth.

We diligently cultivate relationships with clients to help determinetheir dewatering, groundwater control and pumping relatedneeds, tailor an engineered cost–effective, first–class solution tomeet the needs and deliver the solution in a safe, timely,

courteous and professional manner.  We recognize that our pastand 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 clientsand stakeholders through integrity, respect and performanceproviding a solid foundation for all of our projects.

Your Partner in Groundwater Control

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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 andrespect.

•

Empowered We are diligent leaders who encourage people to reach their potential. We attract, develop andretain the best talent for our business. We create exciting opportunities for ourselves and ourclients by growing intellectually.

• Safety We strive to be accident free. We will not compromise our health and safety. We will provide a safework environment through proactive training, focus, and recognition. Our health and welfare iscritical 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. Wepromote accountability through honest, open and professional communication, resulting in greatrelationships and teamwork.

• QualityWe provide outstanding products and unsurpassed service that, together, deliver premium value toour customers. Our actions and personal standards reflect our mission of being the best dewateringand groundwater control company. We focus on delivering desired results within establishedtimeframes.

Your Partner in Groundwater Control

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Coal Combustible Residuals: Challenges andSolutions 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 andexpected drawdown

• High intensity of dewatering by using closely spaced wickpoints thatoperate without disruption

• Preventing recharge from aquifers or runoff

• Effective filtration/treatment of discharged water

Ash Pond Dewatering

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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 ponddewatering are:

• Wickpoints

• Deep Wells

• Well Points

• Eductors

• Sumping

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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.

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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  9

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SEEP 2DGriffin utilizes two dimensional

seepage analysis in order to

calculate the flow lines, constant

head lines and water table for

specific projects like dam seepageand 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

10Modeling is used to develop a cost–effective plan to manage the 3 water sources

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• 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 SpecificationsSoil 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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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.

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SilterMops for freewater pumping

Dewatering Systems

• Geotextile filter assembly

• Tailored to site conditions

• Suspended solids control

•Coupled with reliableGriffin pumps

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Pumps and Equipment

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Full Line of Dewatering and Treatment

Systems

Dewatering Systems

• Deep Well Systems

•

Wellpoint/WickpointSystems

• Eductor Systems

• Open Pumping/

Sumping

• Filtration and

Treatment

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Wellpoints Deep Wells

Eductors Wickpoints

Dewatering Systems

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• 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 filterfabric

• The core provides an uninterrupted

path for water to flow

Wickpoint System

Dewatering Systems

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The right equipment for the job

Dewatering Systems

• Griffin trained crews

• Men, materials, methods

and machines tailored to

the project

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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 trainedto operate, maintain, and repair a wide

range of dewatering and treatment

systems and equipment.

Griffin’s coredewatering business,

includes construction,

dewatering, systems

integration, operation

and maintenance.

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Kingston Fossil PlantAsh 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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Please visit our website for more details at:

www.griffindewatering.com 

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