coal ash dewatering solution

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  • 8/19/2019 Coal Ash Dewatering Solution


    Groundwater Control Since 1934

    Coal Ash Dewatering Solutions


  • 8/19/2019 Coal Ash Dewatering Solution


    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


    Filtration and TreatmentGriffin offers treatment systems for any

    application using the appropriate

    technologies to best treat the water on

    our client’s jobsite.


  • 8/19/2019 Coal Ash Dewatering Solution


    Griffin Dewatering has the engineering capabilities, the experienced personnel and

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

    challenges. 3

  • 8/19/2019 Coal Ash Dewatering Solution


    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


  • 8/19/2019 Coal Ash Dewatering Solution


    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


  • 8/19/2019 Coal Ash Dewatering Solution


    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


  • 8/19/2019 Coal Ash Dewatering Solution


    Lowering the water content of ash

    pond materials by pre-drainage

    increases coal ash cohesion and


    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


  • 8/19/2019 Coal Ash Dewatering Solution


    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.


    Staging between the 3 pumping systems is a key factor in preventing the potential for leachate

    entering the groundwater.

  • 8/19/2019 Coal Ash Dewatering Solution


    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

  • 8/19/2019 Coal Ash Dewatering Solution


    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.


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

  • 8/19/2019 Coal Ash Dewatering Solution


    • Dewatering Systems Design (Permanent

    and Temporary)

    • Aquifer Testing (Pumping Tests and

    Slug Tests)

    • Uplift Pressure Calculation / Relief Well


    • 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


  • 8/19/2019 Coal Ash Dewatering Solution


    Ash Pond Dewatering

    Three Part Solution


    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.

  • 8/19/2019 Coal Ash Dewatering Solution


    SilterMops for freewater pumping

    Dewatering Systems

    • Geotextile filter assembly

    • Tailored to site conditions

    • Suspended solids control

    •Coupled with reliableGriffin pumps


  • 8/19/2019 Coal Ash Dewatering Solution



    Pumps and Equipment

  • 8/19/2019 Coal Ash Dewatering Solution


    Full Line of Dewatering and Treatment


    Dewatering Systems

    • Deep Well Systems


    • Eductor Systems

    • Open Pumping/


    • Filtration and



  • 8/19/2019 Coal Ash Dewatering Solution


    Wellpoints Deep Wells

    Eductors Wickpoints

    Dewatering Systems


  • 8/19/2019 Coal Ash Dewatering Solution


    • 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


  • 8/19/2019 Coal Ash Dewatering Solution


    The right equipment for the job

    Dewatering Systems

    • Griffin trained crews

    • Men, materials, methods

    and machines tailored to

    the project


  • 8/19/2019 Coal Ash Dewatering Solution


    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

  • 8/19/2019 Coal Ash Dewatering Solution



    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.

  • 8/19/2019 Coal Ash Dewatering Solution


    Kingston Fossil PlantAsh Recovery Project

    Tennessee Valley



    Case Study


    Griffin was

    contracted to lower

    water in ash more

    than 10’, creating a

    stable working

     platform and

    allowing a barrier

    wall to be


  • 8/19/2019 Coal Ash Dewatering Solution



  • 8/19/2019 Coal Ash Dewatering Solution


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