Environmental

Our clients have countless environmental, regulatory and engineering needs that demand not only experience but also the application of innovative and cost effective problem solving. To address these needs, Dynamic Solutions LLC can provide our clients with a broad spectrum of environmental science and engineering services. Our staff has extensive experience designing and implementing soil and groundwater environmental investigations and characterizing the nature and extent of contaminant releases. We have delineated and characterized dense non-aqueous phase liquids (DNAPLs) sources in soils and fractured bedrock aquifers and evaluated the feasibility of potential remedial alternatives. In 1999, we authored one of the first Evaluations of Technical Impracticability of Groundwater Restoration ever approved by USEPA Region 1. Dynamic Solutions has directed large-scale solvent, fuel and PCB-related CERCLA investigations in soil, sediment and groundwater and conducted contaminant characterization studies for USDOD, USDOE, USEPA and private clients in over 30 States and on several National Priority List sites across the United States.

The primary scope of our environmental services includes:

• Phase 1 and Phase 2 Environmental Assessments
  
• RCRA/CERCLA site investigation/characterization studies including delineations of hazardous and radioactive wastes
  
• Karst surveys and groundwater investigations
  
• Groundwater Technical Impracticability evaluations
  
• Groundwater monitoring well and monitoring system installation.
  
• Preparation of long-term groundwater monitoring plans
  
• 3-Dimensional groundwater modeling
  
• Evaluations of remedial alternatives
  
• Groundwater remediation studies
  
• Feasibility studies
  
• Site Closure Plans
  
• Clean Water Act NPDES effluent discharge permits
  
• Environmental data management, analysis and statistical analysis
  
• Clean Water Act TMDLs and waste load allocation water quality management studies
• Natural Resource Damage Assessments (NRDA)
  

Selected examples of our environmental projects are described below:

Groundwater Interface Study, Loring Air Force Base, Limestone ME
Dynamic Solutions, LLC staff directed a large, multidisciplinary team in a study to assess the magnitude of potential impacts resulting from projected future discharge of contaminated groundwater to surface water bodies at the former Loring Air Force Base in Limestone, Maine. A specific goal of this evaluation was to determine if recontamination of remediated areas of the Flightline Drainage Ditch and East Branch of Greenlaw Brook would occur as a result of long-term discharge of contaminated groundwater to the streams. Site specific sediment, groundwater and biological sample data were used to estimate potential future ecological impacts.

The study indicated that the mobilized groundwater contaminants in the source areas would discharge to the areas of concern in 3 to 12 years. Since the plumes have been discharging to the Flightline Drainage Ditch and East Branch of Greenlaw Brook for many years and contaminant levels in the source areas are expected to decrease, conditions in the discharge areas are not expected to degrade further. Inorganic contaminant levels presently observed are likely the worst-case scenario. Mobilized inorganic concentrations are a function of the redox conditions in the aquifer. Comparison of the available groundwater data from upgradient, source area, downgradient and discharge area locations revealed that near the discharge areas the redox potentials in the groundwater increase causing mobilized inorganics to return to a solid form. As a result, it was demonstrated that inorganic concentrations return to background concentrations in the aquifer as migrating groundwater approaches the discharge areas and will not impact future ecological receptors.

TVA Fish Passage Study
TVA supplies electrical power to a seven state area in the southeast. As a necessary part of its business, the company continually projects power demands into the future to ensure that it can meet those demands. Since modifying capacity is a time consuming and expensive activity, the analysis of generating capacity must be as accurate as possible. Dynamic Solutions, LLC was selected to conduct a fish passage study based on its experience in compliance evaluations and numerical modeling.

Dynamic Solutions, LLC developed an advanced 3-dimensional hydrodynamic and water quality model of the thermal discharge and cooling system of the Brown’s Ferry Nuclear Plant. The facility is located on the Tennessee River west of Huntsville in northern Alabama. The model was capable of simulating both near-field and far-field effects on river flow past the plant. The model results indicated that no negative impacts to migrating fish or other species were predicted. This effort showed that the results obtained using previous, less sophisticated models were too conservative. The advanced model results generated by Dynamic Solutions led to plans to increase the power production and start designs for the first new nuclear reactor to be designed in twenty years.

Mine Closure Plans
Dynamic Solutions was contracted to prepare mine closure plans for the last two US zinc mines operating east of the Mississippi River. Preparation of closure plans for the mines, located in east and middle Tennessee, required an extensive understanding of former industrial operations and potential environmental liabilities. Both mines were located adjacent to high-quality surface water water bodies situated in areas characterized by extensive karst topography. Dynamic Solutions staff prepared the documents in coordination with Tennessee Department of Environment and Conservation, Mining Section NPDES Program and Safe Dams Division.

Massachusetts Military Reservation Groundwater Modeling Study, Cape Cod
Dynamic Solutions staff developed an extensive 3-dimensional groundwater model of western Cape Cod, Massachusetts as part of an evaluation of potential remedial alternatives to treat existing groundwater contaminated with industrial solvents. Using the model, Dynamic Solutions evaluated several well field designs and various extraction strategies. Based on this work, an extensive extraction system was designed and built. Post-installation system monitoring confirmed the results of the model since contaminant plume capture was achieved and extracted contaminant concentrations in the plume were within ranges predicted by the model.

Thorium Sand Volume Survey
An industrial client previously extracted and processed rare earths from monzonite sands to remove desired radioactive materials. The process waste was discharged to several on-site tailings ponds on an area of approximately ten acres. Dynamic Solutions was contracted to conduct a site characterization study to estimate the quantity of thorium sands and contaminated sediments in order to evaluate disposal options.