About Us - Key Personnel

John M. Twomey

Technical Specialties

Technical Specialties - Environmental Contracting, Site Remediation, AST / UST Services, Transformer Removal / Retrofilling, MGP Remediation, Capping and Related Storm Water Management, Waste Characterization, Packaging, Transportation and Recycling/Reuse/Disposal, and Regulatory Compliance.

Experience Summary

26 years experience; Responsible for evaluation of projects bid by Panther Technologies and the development of remedial approaches. Assist with the project costing with Panther's Project Managers and Estimators to determine economical solutions to address the client's environmental liabilities. Work closely with Operations Manager to meet regulatory and contractual time constraints, manpower efficiency and equipment utilization. Provide technical advice and transition management team member on multiple discipline projects performed by Panther.


  • B.S. Industrial Engineering, Pennsylvania State University, State College, PA
  • NJDEP UST Subsurface Evaluator, Closure and Installation Cert (1992), Recertification (95, 98, 01, 04, 07)
  • Delaware Association of Professional Engineers - Engineering Intern Certificate (1995)
  • Environmental Regulations Course, Executive Enterprises (1993,1997)
  • USACE Partnering Seminars (McGuire, Dover, Philadelphia)
  • 40 hour OSHA Training (1988) and annual 8 hour refreshers including Confined Space Entry Training
  • Federal Acquisitions Regulations Training, George Washington University
  • 29 CFR, 40 CFR, 49 CFR Training, Lion Technology (1987, 1992)

Professional Affiliations

  • Delaware Association of Professional Engineers
  • Member of Society of American Military Engineers (Philadelphia & Baltimore Posts)

Key Projects

  • Project Manager for a $1.8M Manufactured Gas Plant (MGP) source removal project for a coalition of New Jersey public utilities. Services included development and implementation of sedimentation and erosion control plan, air permit for the materials processing, detailed soil management plan, and a health and safety plan (HASP). The project required the dewatering of three (3) gas holders, the treatment of 150,000 gallons of water through a separation chamber and infiltration trench, the surgical excavation and segregation of clean overburden for on-site reuse. Once completed, the source MGP waste was excavated, staged and rendered non-hazardous. Six thousand (6,000) cubic yards of benzene and PAH impacted material was managed and recycled during the course of the six-month operation. Upon completion, the material was tested for waste characterization, loaded and recycled offsite via thermal desorption. The site was backfilled, graded to promote proper drainage and capped with fill and topsoil.
  • Project Manager for three (3) MGP source removal project located in Brooklyn, New York. All work was conducted for Brooklyn Union Gas in accordance with the New York Department of Environmental Conservation approved work plan. The services included the implementation of the DEC approved work plans which included the removal of over five thousand (5,000) tons of RCRA hazardous waste including benzene and lead waste classifications, the removal of free product and the restoration of the sites. The site restoration included capping with a geotextile material, a liner and a light, thin, stable organic layer to restrict rain infiltration, minimize waste generation and blend the area due to the public exposure issues. The next sites included the removal of hot spots within active sites. The services required select closure of the active services areas, expedited removal and restoration services including re-asphalting of the site and the immediate off-site disposal of all waste materials generated.
  • Project Director for a $1.5M MGP source removal project in central New Jersey, which involved the excavation and disposal of 9,000 tons of benzene and PAH impacted MGP soils. All work was conducted in accordance with the New Jersey Department of Environmental Protection technical guidance regulations. Panther won the project based on its innovative approach of leap-frogging trench boxes to maintain excavation integrity without the use of sheeting. The services included the construction of an access road, installation of sedimentation and erosion control measures, 200 gpm well-point type dewatering system with onsite treatment and subsurface recharge gallery, excavation using trench boxes and load out of contaminated soil and transportation to an approved thermal treatment facility. In all, the project included the removal of over nine-thousand (9,000) tons of MGP impacted soils and treatment of over 1 million gallons of ground water, the installation of a geotextile barrier to minimize recontamination of the remediated area and restoration of the site with a geotextile, 18 inches of clean stone and topsoil and vegetated cap over the area.
  • Project Manager for a Northrop Grumman decommissioning project. Panther performed equipment decontamination services on over $50M of highly sensitive gallium arsenide semiconductor manufacturing equipment at the Airtron Division located in Morris Plains, New Jersey. Prior to initiating work, Panther performed treatability studies to determine the optimal chemical agent to remove the contamination while preserving the integrity of the equipment. Our goal was to create an efficient process, which minimized the project time, waste generation and total project cost. Through thorough communication, safe execution and our ability to build in flexibility, Panther has been awarded ongoing projects at the site including additional equipment decontamination, building interior and HVAC system decontamination, PCB decontamination services, encapsulation of select areas of the facility, tank cleaning and other related work totaling over 1,000 man-days of service. Further, the effectiveness of our cleaning efforts on the initial equipment tasks enabled our client to auction portions of their manufacturing equipment lots to an Asian based firm at 60% more than had been estimated.
  • Project Director for EPA Region III Superfund MGP Cleanup located in Dover, Delaware. This highly sensitive site included oversight from the EPA, USACE, DNREC, the Engineer of Record, and Chesapeake Utilities, the lead PRP. The project goal was the removal of 2,200 tons of MGP source waste, including coal pitch volatiles and benzene. The material was treated and rendered non-hazardous on-site and then shipped off-site for recycling via thermal desorption. The project tasks included locating and sampling the holders, bench scale treatability study to optimize reagents, the segregation of overburden from MGP impacted materials, the implementation and mixing of waste materials within the holders, and the load out, transportation and disposal of the waste. Upon completion of the operation, the holders were backfilled with flowable fill material, the site was rough graded to promote proper drainage and the entire site capped.
  • Project Director for a fast-tracked, high profile surgical excavation and site remediation project at a private residence in Gloucester, NJ completed for a large utility company adjacent to their former MGP operation. The project involved the air monitoring for volatiles and inorganic particulate contaminates, excavation, transportation and disposal of lead contaminated soils at a residential location with limited working space. The project was completed under the companies MGP remediation program, as Panther is one of a few pre-approved and qualified contractors selected for this program. The project included removal and replacement of concrete sidewalks and curbing, as well as property restorations required for resale of residence. Real-time onsite vibration monitoring and extensive pre-and post-condition reports were produced as deliverables on demand for the client. The work was completed on-time, accident free and under budget prior to December 2004.
  • Project Director for an MGP source removal project in Central New Jersey, which involved extensive planning with site personnel to ensure the ongoing site operations were not obstructed and personnel were properly protected. All work was conducted for the utility in accordance with the New Jersey Department of Environmental Protection technical guidance regulations. The services included the construction of an access road, installation of sedimentation and erosion control measures, excavation and direct load out of contaminated soil and transportation to the utility company's approved thermal treatment vendor. In all, the project included the removal of over two thousand (2,000) tons of non-RCRA hazardous waste, the installation of a geotextile barrier to minimize recontamination of the remediated area and restoration of the site with clean fill. The site restoration included capping with a geotextile and 3" clean stone cap over the area.
  • Project Director for an extensive test pitting project for MACTEC at an MGP site located in Edison, New Jersey. The service included the testing pitting of over 1,200 linear feet of trench to a depth of up to 32' deep. The work was performed to locate existing utilities, former gas work structures including holders, tar wells, separation chambers, piping and building foundation, as well as, to ascertain the location and concentration of MGP impacted soil. In all, over 4,000 yards of waste material was handled and multiple crews managed the project to fast track the investigation. Panther worked closely with the owner and the operations group at the site to ensure all active services were located and protected, the access to the facility was managed and work being conducted was completed in a fashion that minimized disruption to the owners operation.
  • Project Director for a $1,000,000 turnkey decommissioning of a former sulfuric acid manufacturing plant (Superfund Site) located at a former chemical plant located in Front Royal, Virginia. Panther mobilized in June 2001 and began a site wide asbestos abatement project including over 5,000 linear feet of piping and 22,000 square feet of asbestos siding, flooring and insulation. Concurrent with this operation, our team performed waste sampling, characterization and lab packing services to eliminate all incidental hazardous materials prior to full-scale decontamination and demolition activities of the plant. Panther performed the decontamination and demolition of the entire plant over a 20-week period with full time oversight of the Owner's Site Engineer and USEPA. The closure included fifty-five (55) process vessels and tanks, over 5 miles of piping, 110,000 square feet of site buildings and structures, towers and railcars, rail car loading and unloading stations. The work was completed on budget, on schedule and without an injury. In addition to this work, Panther developed a plan to treat and dispose of over 2000 tons of acid impacted soil. Through onsite treatment (elementary neutralization) our group was able to offer our client a $100,000 in savings on the project.
  • Project Director for an esters plant formerly owned by Bayer Corporation in Carteret, New Jersey - Panther mobilized and completed the 5-acre facility closure and site remediation of a former esters plant which included the cleaning of sixty (60) process vessels and reactors, 20,000 linear feet of piping, ventilation equipment, trenches, wall and floors of the entire manufacturing operation. Site remediation activities including the excavation of listed hazardous wastes, installation of new piping and vaults, as well as the asphalt capping of remediated areas. We earned the opportunity to provide a proposal by recently completing two (2) other projects at the site on which we received exceptional safety, communication and performance marks, while implementing cost reduction strategies.
  • Sun Chemical Facility, Carteret, New Jersey - Panther was contracted to decommission a solvent and ink manufacturing operation which included the cleaning of fifty (50) aboveground tanks, 5,000 linear feet of process piping and the collection and disposal of all waste materials. We also removed ten (10) underground storage tanks containing various highly flammable solvent which included product removal and recycling, tank entry and cleanout, tank extractions and backfilling of the area, followed by paving of the entire area. The work was completed under a specific time frame, on budget and accident free.
  • Project Director for an 18 month, $65M Army Corps of Engineers project at McGuire Air Force Base which included the construction of an underwing fuel supply line installation. Responsible for the $2.5M environmental component involving the excavation of 1M cys of soil and the dewatering of 15M gallons of ground water. The field screening process reduced the total quantity of jet fuel contaminated soil requiring transportation and disposal to 150,000 cubic yards. In addition, a well point dewatering system was installed to allow the excavation to commence and successfully allowed for the on-site discharge of 13M gallons of water. The water generated was collected and staged in the ten (10) frac tanks for onsite testing prior to disposition on-site or off-site per the USACE approved work plan.
  • Project Manager for multiple aboveground and underground storage tank projects in Pennsylvania, New Jersey and Delaware valued aggregately at over $2M. Services included utility disconnects, demarcation of OSHA zones, line purging, line pigging, tank desludging and cleaning, confined space entry, waste removal, transportation and disposal. Generally, the tanks were extracted, soil samples obtained, and areas backfilled or over-excavated due to contamination. Imported certified clean fill was used to fill the void created by the extraction and the areas were restored to original condition. Example clients include Handy and Harmon, SmithKline Beechem, General Electric, Rockland, Allied Signal, Rutgers University, Armstrong World, Alcoa, IMO Industries and NJ Dept. of Military Affairs.
  • Extensive experience with the management, characterization and disposal, recycling or reuse of various waste materials including universal waste, PCBs, aqueous waste waters, oil contaminated water and soil, metal and volatile contaminated soil and others. Service value over $30M.
  • Project Manager for a CERCLA remediation project located in Modena, New York. The work included the clean out of a twelve-acre lagoon/sedimentation basin. The project was broken into three phases to assist in the management of the removal of 1,000,000 gallons of water, which required treatment for metals prior to re-introduction into the area lagoon. The services involved the construction of a 20,000 square foot staging and processing pad, the construction of a truck decontamination pad, the installation of cofferdams, and the installation of a crane mat road system to preserve wetlands. The project required the removal and treatment of water, and the removal and stabilization of 8,000 tons of lagoon sediment, and the transportation and reclamation of the material as landfill cover soil. Once completed, the lagoon was restored with a mixture of shale and organic fill and the wetlands replenished.
  • Estimator and Project Manager of a non-hazardous soil excavation and disposal project in Pennsylvania. Project involved the removal of over 5,000 tons of petroleum-contaminated soil from an active industrial property that included a checker board excavation technique to eliminate the need to sheet or shore the site. Post excavation soils were field screened on-site using TPH immunoassay kits to minimize delays and the project site was backfilled on a daily basis due to the highly traveled region of the plant and the depth of the excavation.
  • Project Manager of a 12,000 cubic yard excavation, on-site screening and restoration project designed to segregate and dispose buried construction debris on a former golf course in Philadelphia. During the excavation activity, the engineer detected the presence of TPH contamination in post-excavation soil samples. A total of 5,000 tons of soil was recycled off-site at a thermal desorption facility. Remaining stockpiled soil was reused on-site as backfill material and the concrete crushed and reused for installation of new access roads.
  • Project Manager for the closure of three (3) lagoons for the City of Lancaster at the direction of Buchart Horne Engineers. The services included the installation of a dewatering system and excavation, transportation and disposal of 23,000 tons of septic sludge from 3 lagoons in Lancaster, Pennsylvania. Site set-up included decontamination pad installation, waste management pad installation, set-up, clearing, grubbing, grade control, materials handling, trouble shooting and final closure of services.
  • Project Manager for a remediation project at the Philadelphia Navy Yard, which included site surveying, excavation, waste sampling plan development and implementation, waste characterization, transportation and disposal of 600 tons of PCB contaminated waste. Services additionally included the backfilling, compaction and restoration of all disturbed areas, preparation of as-built drawings, coordination with base personnel, compliance with responsible Federal, State and local laws related to TSCA regulated substances.
  • Project Manager for decommissioning of a New Jersey permitted Trichloroethane System in Cinnaminson, New Jersey. The work was performed in accordance with an NJDEP closure plan, which allowed the client to decontaminate a TCE reclamation system. The sludge and rinse water was collected in 55-gallon drums from various the tanks, pipes, drying columns, etc. The system was match marked and packaged for relocation and assembly at a new reclamation facility. Additionally, all floors were pressure washed to remove residual TCE. Samples of the used wash waters and the clean unused wash water was sent to a NJ certified lab to verify effectiveness of the process. Per the NJDEP review of the sample results, the work was deemed successful and a final closure report was submitted and approved.
  • Project Manager for the cleaning and removal of 13 underground storage tanks containing various petroleum products ranging in size from 500 to 25,000 gallons belonging to the former IMO Industries located in Trenton, NJ. Services were conducted in accordance with API Recommendation for proper closure of UST's and NJDEP regulations pertaining to the same. Services were performed over an eighteen-month period and included all aspects of the removal, including concrete recycling, tank carcass scrapping, excavation and staging of contaminated soils. Development and implementation of the waste pile sampling and analysis plan and other related activities included disposal, backfilling and final restoration.
  • Project Manager for Superfund action that required the removal of RCRA hazardous waste adjacent to an active runway at the Plattsburgh Air Force Base located in Plattsburgh, New York. Our team was responsible for pre-excavation activities including surveying site delineation of work zones and constructing temporary fencing. A site work plan was developed and implemented, which included the demolition of a 600 square foot concrete pad, the surgical excavation of 200 cubic yards of pesticide contaminated soil, and the direct loading of all waste onto the transportation vehicles. The hazardous waste was transported via sealed dump trailer to an off-base RCRA incineration facility for final disposal. Restored site with certified clean fill graded areas to restore general drainage patterns, and installed clean topsoil. The site was seeded, the area cleared of any potential debris and the site demobilized.
  • Project Manager for the collection, staging, sampling and characterization of 4,000 drums at a former farm located in Western Pennsylvania. The site was one of the first Brownsfield projects completed in Pennsylvania. The project included access road construction, select clearing, drum staging and processing pad construction, waste sampling and field testing, compositing of waste samples and analysis of the same. Once completed, the disposition of each container was determined and packaging of each container commenced. The final step was the excavation of areas contaminated by the drums that leaked. In all, 5,500 tons of soil required removal and disposal at a local subtitle D landfill.

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