Environmental Services


Gibson-Thomas Engineering Co., Inc. environmental services are provided by a specialized professional staff of Environmental Engineers, Environmental Scientists and Environmental Specialists. The collective knowledge and experience of our environmental staff allows us to provide environmental services in virtually every aspect of a project from preliminary planning, design, construction, mitigation, restoration, monitoring and documentation.

We have provided our expertise and services to clients including the Pennsylvania Turnpike Commission, Pennsylvania Department of Transportation , Pennsylvania Department of Environmental Protection, Pennsylvania County Conservation Districts, Counties, Municipalities, Authorities, Private Developers and Individuals. We pride ourselves on providing services to our clients that are of most benefit to their specific interests and the well-being of the environment as whole. The types of environmental services we provide are:


  • PADEP Chapter 102 & 105 Permitting
  • Erosion & Sedimentation Control Plan Design & Permitting
  • National Pollution Discharge Elimination System (NPDES) Permitting
  • Joint State & Federal Encroachment Permitting
  • Wetland Identification & Delineation Reports/Wetland & Stream Mitigation Plans/Function Assessments
  • Phase I Environmental Site Assessments (ESAs)
  • EPA Risk Management Plans
  • Threatened & Endangered Species Coordination & Surveys
  • Stormwater Management Plans & Reports/Post-Construction Stormwater Plans & Reports
  • Hydraulic & Hydrologic Reports (H&H)
  • PNDI Searches & Clearances /Threatened & Endangered Species Coordination & Surveys
  • Pennsylvania Historical & Museum Commission (PHMC) Coordination
  • Preparedness, Prevention & Contingency Plans/Pollution, Prevention & Countermeasure Plans
  • Perc & Infiltration Testing and Coordination
  • Acid Mine Drainage Remediation


  • Asbestos Building & Structure Inspections
  • Noise Monitoring & Analysis/TNM (Traffic Noise Model)
  • Federal Highway Administration Section 4(f) Evaluations
  • National Environmental Policy Act (NEPA) Documentations
  • Categorical Exclusion Coordination (Levels I, II, III)
  • Environmental Impact Statements
  • Farmland Assessments

Gibson-Thomas Engineering Co., Inc. is a multi-discipline consulting engineering firm established in 1916 in Latrobe, Pennsylvania. Our past experience, key staff and commitment to total client satisfaction are the major factors that our clients consider when contracting with Gibson-Thomas Engineering.

Corporate Office
  • Corporate Office
    • 1004 Ligonier Street
      Latrobe, PA 15650
    • P: 724-539-8562
Pennsylvania Offices
  • Clarion Area Regional Office
    • East Brady, PA
    • P: 724-526-2190
  • Harrisburg Area Regional Office
    • Camp Hill, PA
    • P: 717-612-9880
  • Indiana Area Regional Office
    • Indiana, PA
    • P: 724-471-2246
  • Pittsburgh Area Regional Office
    • Wexford, PA
    • P: 724-935-8188
Florida Office
  • Fort Myers Area Regional Office
    • Ft. Myers, FL
    • P: 239-776-2908
Virginia Office
  • Virginia Office
    • Richmond, VA
    • P: 804-672-4221