GEA Engineering PC

Site Remediation


GEA Engineering P.C. (GEA) offers clients complete investigation, design, feasibility testing, permitting, installation, and operation of in-situ and ex-situ site remediation systems. Previous design and full-scale implementation has included: Groundwater collection and treatment including physical, chemical & biological advanced treatment techniques. Soil vapor extraction (SVE) bioventing, air sparging, nutrient sparging & vacuum extraction. Bioremediation of soils, soil stabilization and in-situ bioremediation of groundwater. Vapor treatment through thermal processing, catalytic oxidation, and adsorption.

GEA begins the design process of each project with a detailed analysis of field and assessment data to determine contaminant source mass and distribution. GEA's Engineering Group then investigates remediation alternatives based on client objectives, contaminant risk, site-specific subsurface conditions, long-term cleanup goals, regulatory compliance, and cost-effectiveness. The key design consideration typically is the rapid removal of subsurface source contaminants that pose an environmental risk and health hazard. GEA's extensive remediation experience engenders professional decision-making in an atmosphere that fosters innovative ideas and bold solutions that mitigate project cost, ameliorate liability and save valuable time.

Prior to finalizing the system design for site scale-up, the Engineering Group will devise and conduct field testing to verify the effectiveness of selected remediation technologies. Feasibility data is input into computer simulation models to determine actual removal rates and treatment efficiencies. Whether proven or innovative technologies have been specified, GEA has demonstrated success in obtaining necessary permits and regulatory approvals often requiring negotiated cleanup and/or discharge standards. Once design and permitting functions are completed, GEA's Field Services Group and Engineering Group review the design plans together to develop a construction and implementation schedule. The Field Services Group utilizes experienced and licensed professionals in the construction disciplines required for the project. All work is performed in a manner that minimizes potential disturbance to any site operations and the surrounding area.

Remediation systems are operated and maintained by skilled field personnel in strict adherence to permit standards. Working closely with clients over regional areas, GEA has significantly reduced operational costs for many treatment systems by standardizing operational routines and reorganizing operational scheduling to allow for multiple site visitations.

GEA Assessment

The GEA Assessment by GEA Engineering P.C. is an innovative sampling and analytical process which significantly improves the quantity and quality of data generated during subsurface environmental investigations, in a time-compressed format. The essential basis of the technology lies in two unique systems modified by GEA to provide accessibility, rapid deployment, and accuracy in on-site analysis of gases, soils and groundwater.

Unlike traditional assessments which rely on costly and slow drilling equipment and weeks-long off-site lab analysis, the GEA Assessment uses rapid narrow-diameter sampling, and real time on-site analysis. With this approach, up to five times as many samples may be collected in all matrices, with the results from each sample reported immediately in the field to efficiently guide sampling activities. With the GEA Assessment, instead of concluding 'more wells, more lab costs, more study' when the data are presented, the client will see comprehensive answers, and begin considering solutions developed by the GEA Project Team.

Experience, Diversity & Adaptability

GEA Engineering P.C. can produce a comprehensive GEA Assessment in virtually any physical setting including urban and rural areas, tank fields or in buildings because of the mobility of equipment used, with sampling depth capabilities to over 100-feet, in most cases. The range of analytical diversity allows immediate characterization and distribution analysis for VOC'S, HVOC'S, PCB'S, and inorganic pollutants in all matrices, and if warranted, the GEA Project Team can produce computer generated graphics to illustrate findings mid-process for client review and solution planning. By emphasizing vertical contaminant distribution, the process provides the critical three-dimensional view often neglected with traditional approaches. Viewing contaminant mass in a clear, multi-dimensional perspective provides the necessary basis for accurate and predictable remediation cost projections.

Specialized sample acquisition techniques and sophisticated laboratory processes, are handled by senior level scientists who make decisions based on actual experience with proven strategies.

Effectiveness and Innovative Solutions

As well as providing accurate and timely contaminant identification for site groundwater and soils, GEA often incorporates specific analysis into petroleum hydrocarbon studies to support findings and reduce overall analytical expenses. Immiscible, adsorbed, and dissolved phases are further delineated by measuring O2, CO2 and redox potentials in a mobile laboratory, and interpreting relative abundance characteristics immediately onsite. Key sampling locations are often quickly targeted in the field using these techniques, minimizing the exploration effort and associated costs.

The GEA Assessment is an integral component of GEA's ASCA program, used in a wide range of projects for general industry and in goverranent sponsored site investigations. In place of conventional Phase II assessment techniques, GEA Assessment refines real estate risk analysis to a highly efficient screening process which will identify suspected contaminants and provide enough data to plan, implement, or budget solutions... in a matter of days as opposed to weeks or months.

GEA Assessent by GEA Engineering P.C. provides accurate answers in less time, at less cost, in a single event.

Risk Assessment Services

GEA Engineering P.C. (GEA) provides risk assessment services including: environmental receptor studies, fate and transport modeling, data interpretation and closure negotiation services on a site-specific basis. Risk analyses are conducted in accordance with ultimate site cleanup criteria and long-term project goals using practice standards and regulatory accepted protocol. In a regulatory climate increasingly receptive to risk-based environmental solutions, GEA is positioned in the vanguard of environmental risk assessment and quantification. Key principal Engineers & Scientist serve on statewide and city risk assessment panels and task forces.

The environmental receptor study involves at least one site visitation and often extensive records searches to establish the location of sensitive receptors in the area of the project site and potential exposure pathways. This study may also involve additional subsurface investigation if specific data are required to satisfy parameters of the selected computer mode.

After acceptable physical setting and contaminant specific data have been established, the site data are input into the most appropriate of several advanced fate and transport modeling packages. GEA's approach is to collect actual site data to satisfy model assumptions in an effort to more fully validate the contaminant fate and transport conclusions. GEA has often obtained regulatory acceptance to cleanup requirements based on technically sound scientific data, as opposed to commonly applied arbitrary standards such as 'background' or non-detectable concentrations.

Model output is then analyzed by GEA scientists sensitive receptors and future contaminant migration. In addition, GEA evaluates the human health risk associated with the toxicity and concentration of contaminants identified on the site. The final risk assessment conclusions are formulated for presentation in a report stating the relevance of findings to the long-term environmental risk represented by the site. Recently, GEA has been successful in presenting risk assessment findings to regulatory agencies to negotiate site closure or site-specific, achievable cleanup standards.

For many clients, GEA's professional experience and persistence in negotiation of riskbased remediation standards has resulted in significant cost savings. Risk evaluation has been equally valuable to many clients in prioritizing work steps on multiple jobs or tasks within large projects.


Accelerated Site Closure Approach (ASCA) was developed by GEA Engineering P.C. as an effective alternative to the prolonged and traditional unsuccessful groundwater cleanup processes used for subsurface petrochemical spills over the past 25 years. The ASCA approach recognizes that conventional assessment methods provide insufficient, if not misleading data upon which remedial strategy decisions are often based, and avoids costly traditional 'multiple phase' evaluations.

Towards a New Approach. . .

Businesses and owners engaged in groundwater cleanups soon realize that once started, assessment and remediation activities can drag on for years, primarily because the consulting industry has focused on measuring, mapping, and treating the dissolved phase plumes associated with most petrochemical discharges. In fact, the dissolved phase so often scrutinized by consultants and regulators alike typically represents only about 25% of the total spilled mass. And in terms of recovery and long term monitoring, this 2-5% is often the misdirected focus of expensive and redundant site activities. Compounding the problem, the widely used 'pump and treat' process often dislodges small fragments of the total mass below the water table surface, where in a soil adsorbed state, it could become a long term leachate source which ftirther extends the monitoring and treatment life of the project.

ASCA is based on scientifically sound geochemical, hydrogeological and environmental engineering principles using innovative physical technologies to accelerate reaching the critical objective of every remediation project ... CLOSURE. The principal features of ASCA are summarized as follows:

  • Target objectives of each project are established up front (typically, accelerated closure), with the client, regulator and GEA Project Team.
  • Comprehensive site evaluations are completed (see GEA ASSESSMENT) in three days or less, fully defining the vertical and lateral distribution of adsorbed-phase contaminants above and below the water table.
  • Using GEA ASSESSMENT data, develop aggressive mass recovery solutions which may include a combination of targeted small excavations, sparging to liberate trapped volatiles, and vapor extraction to capture residual mass in the vapor phase. Vertically selective, precision-controlled capture pumping may be used in combination in the presence of buoyant LNAPL'S.
  • GEA ASSESSMENT data may indicate a 'no action' remedial course, or, risk modeling may be employed following limited corrective actions to demonstrate the natural attenuation potential of minor residual concentrations.

The main advantage of the ASCA process is more meaningful data in a fraction of time, a focused remedial strategy with immediate, goal reaching results, and significantly reduced assessment and overall project costs.

GEA Engineering P.C. can break through the current pattern of wasting valuable resources on ineffective and redundant remedial programs, with ASCA.

Environmental and Construction Management Services

The Environmental and Construction Management Services Group (ECM Group) of GEA Engineering P.C. (GEA) specializes in large scale construction, excavation, materials decontamination, waste disposal, facility envirom-nental management, tank management, and rapid containment and response. The ECM Group has been involved in projects ranging in complexity from closure and removal of a single underground storage tank to multi-stage decontamination, demolition, disposal, and remediation of hazardous waste sites and manufacturing facilities

The Environmental and Construction Management Services Group relies on experienced and proven GEA site supervisors. Each site supervisor is versed in management of diverse resources required for completion of large-scale industrial projects. Work progression and scheduling is agreed upon with the client to maximize efficiency in light of project goals and any on-going sit operations.

The Environmental and Construction Management Service Group provides full construction management contracting authority while managing all environmental issues from one source. CM responsibilities include: Bidding, Procurement Services, Contract Formation, Onsite Monitoring and Supervision, Testing, Shop Drawing Approvals, Field Engineering, Inspection, Performance Testing, Scheduling, Budget Tracking, Permitting, Payment & Claims Review, Reporting and Closeout. Construction activities are conducted in coordination with involved governmental agencies and in compliance with all applicable safety standards.

The range of services offered by the ECM Group compliment the diversity of engineering and solution design capabilities provided by GEA, including the following:

  • Wastewater Treatment Plants
  • Water & Sewer Systems
  • Single or multiple underground storage tank removal projects
  • Solid Waste Landfills
  • Landfill Gas Collection and Recovery Systems
  • Contaminated soil excavations, staging, and characterization
  • Designed or engineered earthwork projects
  • Facility decontamination, demolition, or closure preparation
  • Groundwater or wastewater treatment plant construction
  • Waste characterization, consolidation, and disposal in Lagoon and impoundment closure

As part of facility compliance, GEA has implemented tank management programs for both underground and aboveground installations. Tank management services involve permitting, closures, removals, and upgrades in compliance with evolving regulatory standards.

With the ECM Group, solutions engineered by GEA Engineering, P.C. are implemented and constructed on schedule and within budget.

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