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David M. Brown, P.E., CGWP
Treasurer / Principal Engineer

David Brown is a project manager with over 25 years of experience in environmental engineering and remediation. He applies his expertise in civil engineering and design, groundwater hydrology, modeling, chemistry, laws and regulations, and management to help clients achieve a rational reconciliation between their regulatory and financial objectives.

Face: dmb


Intermodal Hazardous Waste Transfer Station: Mr. Brown designed a truck-to-rail transfer station for hazardous waste. The project included a truck ramp, platform, and hopper spanning a rail spur. A pre-engineered fabric-covered frame building covers the entire operation. Other design aspects included deep pile foundations due to subsurface peat deposits, concrete foundations and pile caps, site grading, electrical, ventilation, and operations.

Fast-Track Remediation: Mr. Brown performed fast-track remediation of a spill of styrene and phenol from an AST at a chemical manufacturing facility where the secondary containment system also failed. The project involved removal of concrete slabs, contaminated subbase, and contaminated underlying clay. The clay prevented the contaminants from impacting groundwater. Post-excavation samples showed that the remaining soils meet Pennsylvania Act 2 statewide health standards. However, the subbase below the ASTs contained some compounds in concentrations exceeding groundwater protection standards. Mr. Brown designed and supervised installation of a concrete and compacted clay cap system to eliminate the soil to groundwater exposure pathway.

In-Situ Bioremediation: Mr. Brown designed and managed an in-situ groundwater bioremediation system to treat soil and groundwater from a UST release. The system used bioaugmentation and time-release oxygen socks to remove gasoline constituents from impacted soil and groundwater.

UST Corrective Action: Mr. Brown manages and performs technical, financial, and regulatory aspects of UST corrective action at several service stations and industrial sites. Mr. Brown has designed and implemented pathways to closure on numerous sites. Site characterization tasks include surface geophysical surveys, Geoprobe soil and groundwater sampling, monitoring well installation and groundwater sampling, and surveying. Interim remedial action tasks include soil excavation and disposal and product removal by hand bailing, automated product removal system design and installation, and regular high vacuum enhanced fluid recovery events. Remedial technologies employed at the sites include bioremediation, soil vapor extraction, bioslurping, air sparging, excavation and disposal, groundwater extraction, air stripping, and activated carbon adsorption.

Gasoline Pipeline Spill: Mr. Brown headed engineering aspects of the emergency response to a 250,000 gallon gasoline spill at a pipe line terminal. This included excavation of numerous test pits and Geoprobe boreholes to track the subsurface migration of the gasoline, installation of nested soil and bedrock monitoring wells to identify groundwater impacts, creation of a hydrogeologic conceptual model to explain the observed product migration patterns, preparations to pump accumulated rainwater from a contaminated sedimentation pond , and construction of an active vapor recovery barrier on the ground surface to prevent migration of carcinogenic and explosive vapors from the site to a nearby community.

Compressor Station Remediation: Mr. Brown designed and managed a turnkey remedial action at a natural gas compressor station to remove and dispose of soils impacted with hydraulic and lubricating oils. The project was completed on time and within the budget.

Aviation Fuel Farm Design/Build: Mr. Brown designed a fuel farm and containment dike for a business aviation center at an international airport. The design included laying out four 40,000-gallon Jet-A tanks, a 12,000-gallon aviation gasoline tank, a 2,000-gallon motor gasoline tank, a 2,000-gallon diesel fuel tank, and a 550-gallon waste tank. A recessed concrete containment dike was designed to contain spills. Bulk loading and unloading pads were included to drain into the containment area. A pumping pad was designed to move bulk Jet-A fuel at 400 gpm. Mr. Brown prepared all required state, county, and local plans and permits and prepared complete plans and specifications for construction. Mr. Brown managed the installation of the concrete system and the AST installation and piping.

Facility Decommissioning: Mr. Brown designed and managed the decontamination and closure of an electrical conduit manufacturing facility. Activities included asbestos removal; testing, removal, and disposal of miscellaneous liquids discovered in pits and vaults; cleaning and decommissioning of ASTs, USTs, and miscellaneous structures; soil and groundwater sampling; removal and disposal of acid-contaminated concrete and subsurface soil below a zinc plating line; analysis of United States Nuclear Regulatory Commission regulations pertaining to handling of minor amount of nuclear source material; negotiations with the West Virginia Department of Environmental Protection (WVDEP); and preparation of a closure report. The project was completed to the satisfaction of the buyer, seller, and WVDEP.

Cooling Pond Design: Mr. Brown designed and managed the construction of an oil/water separator and cooling pond at a plastics manufacturer in Southeastern Ohio. The discharge included non-contact cooling water and stormwater from roof drains. As such, the separator design was dominated by the high flows and the cooling pond design was dominated by the low flows. The system is operating successfully.

Chemical Plant Acquisition: Mr. Brown managed a Phase II environmental site assessment for the purchaser of a chemical plant in Western Pennsylvania. This included installation and sampling of monitoring wells in a former waste burning area, construction oversight of the removal of a former UST that was being used as an SPCC containment structure, and technical assistance in indemnity negotiations with the seller.

Airport Remediation: Mr. Brown managed and performed the final phase of remediation at the site of a fuel farm spill. The project included dewatering a groundwater interceptor trench that had been used to contain and separate a jet fuel release. The dewatering effluent was treated and pumped to the sanitary sewer under a permit. In addition, the sludge remaining in the trench was transported to a solidification facility, where it was mixed with cement kiln dust and landfilled.

Slurry Wall Investigation: For a confidential coke manufacturer, Mr. Brown managed geotechnical and geochemical subsurface investigations for a proposed slurry wall installation around a coal tar lagoon. The information was used to design the depth and location of the slurry wall so as to contain the majority of the coal tar deposits and to key into weathered bedrock. Samples were collected from slag and lime sludge deposits to evaluate the geochemical compatibility of those materials with the proposed monosodium bentonite slurry and soil/bentonite wall materials.

Innovative Pumping Test: For a confidential electronics manufacturer, Mr. Brown designed, implemented, and analyzed an innovative aquifer pumping test at an operating municipal wellfield potentially threatened by a plume of dissolved trichloroethylene in groundwater. The test was analyzed using computer-assisted superposition techniques.

Hazardous Waste AST Replacement: Mr. Brown managed and implemented the replacement of a 25,000-gallon AST used to store spent activated carbon. The old tank was cleaned and the sludge contained in a sludge box and transported to a TSDF. Then, the tank appurtenances were removed and the tank was demolished in place. Finally, the new tank was placed and reconnected to pumps, piping, and gauges and a new ladder and catwalk were installed. The entire project was performed within a 7-day plant shutdown period without impacting plant operations.

Groundwater Pumping and Treatment: Mr. Brown created a three-dimensional model of groundwater flow model at a confidential solid waste landfill in Maryland where trichloroethylene had impacted groundwater. The model was used to design a groundwater extraction, treatment, and reinjection system. Mr. Brown managed the preparation of plans and specifications and assisted the client in bidding and construction management.

Landfill Permitting: Mr. Brown created a three-dimensional model of groundwater flow at a municipal landfill in Eastern Ohio constructed in a former limestone strip mine. The model was used to predict the maximum water table elevation that would occur if headwall dewatering pumps were turned off. This information, in turn, was used to design expansion phases of the landfill so that the required 15-foot buffer distance between the water table and recompacted soil base would always be maintained. The client stated that the model was instrumental in allowing them to obtain their permit to install the expansion phases.

Risk Management Plans: Two perishables warehouses both used more than 10,000 pounds of ammonia in their refrigeration systems, causing them to be regulated under the USEPA's new risk management regulations. Mr. Brown worked with facility safety and engineering to identify process hazards for the process safety management programs; calculated potential off-site consequences of an ammonia release and prepared emergency response plans for both facilities detailing procedures for minimizing the effects of an ammonia release; and helped plan and conduct public meetings to convey the contents of the plans to interested parties.

Expert Testimony: For a citizens' lawsuit opposing the permitting of a project to spray municipal sewage onto agricultural field, Mr. Brown provided expert testimony regarding a ground water flow model that the permittees' consultant had constructed. Their model purported to show that the additional ground water recharge due to the irrigation would not cause significant water table mounding. Mr. Brown used simple "back of the envelope" calculations to demonstrate fatal flaws in the ground water model. If the project had been constructed, Mr. Brown showed, the water table would have risen to the point that springs would form and the sprayed irrigation would run off directly into the nearby surface waters.

Air Pollution Controls: For a confidential manufacturer of rubber gaskets and seals for the automotive industry, Mr. Brown designed air pollution control equipment consisting of cooling coils and an electrostatic precipitator to reduce visible opacity emissions from curing ovens. Construction drawings were prepared, including structural steel specifications and details.

UST Upgrades and Change-in-Service: Mr. Brown designed and prepared plans and specifications for the upgrade to two 10,000-gallon fiberglass USTs. The upgrades included spill/overfill protection, double-walled plastic piping, new dispensers and islands, electronic leak detection and inventory control, and a card reader fuel management system. One of the tanks was also changed from gasoline to diesel fuel service.

Superfund Remedial Investigation: Mr. Brown was the remedial investigation field operations leader at the Norwood PCB Superfund Site, in Norwood, Massachusetts. The investigation included drilling, sampling, surveying, and on-site PCB analyses using a mobile laboratory. OSHA performed a site inspection, which was passed without citation. Mr. Brown wrote the work plan, quality assurance project plan, the remedial investigation report, and the feasibility study report. The USEPA Region I later used the remedial investigation report as a model for subsequent projects to emulate.

Superfund Feasibility Study: Mr. Brown co-wrote the feasibility study report for the Pinette's Salvage Yard Superfund Site, in Presque Isle, Maine. For this project, Mr. Brown calculated allowable maximum soil contaminant levels for protection of groundwater. This method was subsequently incorporated by the USEPA in a compendium of examples of such calculations.

Trichloroethylene UST: Mr. Brown designed and implemented an investigation to determine the rate and extent of migration of trichloroethylene from a UST at a confidential computer manufacturer in Massachusetts.

Slurry Wall Optimization Modeling: Mr. Brown created a three-dimensional ground-water flow model for the Gilson Road Superfund Site, in Nashua, New Hampshire. In addition, he designed, implemented, and analyzed an aquifer pumping test in highly fractured bedrock. The test and model were used to evaluate the in-place bulk hydraulic conductivity of a soil/bentonite cutoff wall that had been constructed to contain highly contaminated groundwater. In addition, the model was used to optimize pumping and recharge rates inside the containment system so that hydraulic gradients across the cutoff wall would always remain inward while minimizing the average flow rate of groundwater requiring treatment.


  • M.S. Civil Engineering, Massachusetts Institute of Technology, 1984
  • B.S. Civil Engineering, Massachusetts Institute of Technology, 1981


  • Dale Carnegie Leadership Training Institute
  • 40-Hour Hazardous Waste Operations and Emergency Response
  • 8-Hour Annual Refreshers Hazardous Waste Operations and Emergency Response
  • DOT 4-Hour Supervisory Substance Abuse Training
  • MSHA Mine Site Operations and Safety
  • American Red Cross First Aid and CPR
  • Air Dispersion Modeling Short Course
  • Petroleum Hydrocarbon LNAPL Short Course


  • American Society of Testing and Materials
  • American Geophysical Union
  • National Ground Water Association


  • Brown, D. M., Stochastic Analysis of Flow and Solute Transport in a Variable-Aperture Rock Fracture, M.S. Thesis, Massachusetts Institute of Technology, 1984.
  • Brown, D. M., and L. W. Gelhar, The Hydrology of Fractured Rocks: A Literature Review, Ralph M. Parsons Laboratory, Report No. 304, 1984.
  • Barvenik, M. J., D. M. Brown, T. J. Kern, and M. A. Sills, Evaluation of Cutoff Wall Containment Efficiency Using Aquifer Stress Analyses - Gilson Road NPL Site - Nashua, New Hampshire, in Land Disposal, Remedial Action, Incineration, and Treatment of Hazardous Waste, Proceedings of the Twelfth Annual Research Symposium, Cincinnati, Ohio, 1986.
  • Brown, D. M., The Fidelity Fallacy, Groundwater, 30(4), pp. 482-483, 1992.
  • Brown, D. M., R. A. Stanley, and D. A. Edmonds, Groundwater Modeling in Support of Siting a Municipal Solid Waste Landfill in a Former Limestone Quarry, in Proceedings of the Sixteenth International Madison Waste Conference, Madison, Wisconsin, 1993.
  • Brown, D. M., Reducing Modeling Uncertainty Using ASTM Ground-Water Modeling Standards in Subsurface Fluid-Flow (Ground-Water and Vadose Zone) Modeling, ASTM STP 1288, J. D. Ritchey and J. O. Rumbaugh, eds., American Society for Testing and Materials, Philadelphia, 1996.

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