BL Companies provides integrated services including — architecture, engineering, environmental sciences, land surveying, landscape architecture, planning, transportation engineering, structural engineering, MEP engineering and subsurface utility engineering — to clients in Connecticut, New York, Maryland, Pennsylvania and throughout New England. The diversity of our services, projects, corporate atmosphere and seven locations help us offer and maintain a high quality degree of service and passion for our projects.

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Environmental issues, whether contamination or resource assessments, often shape a project’s schedule or budget. They may even control the feasibility of the project. BL Companies offers a complete range of environmental science resources, combined with technical knowledge and expertise, to develop creative, cost-effective, responsible solutions that bring a client’s project to completion. Our diverse expertise in transaction-based problem solving, assessing and securing environmental permits, and navigating the myriad of environmental resource assessment and permitting issues provides our clients with a single resource for environmental needs typically not found under one roof.

BL Companies offers a complete range of environmental services. We specialize in:

  • ASTM 1527–05 Phase I environmental site assessments
  • Phase II and III site assessments
  • Site remediation and closure
  • UST/AST compliance
  • Geophysical surveys
  • Hazardous building materials inspections
  • Wastewater discharge permits
  • Stormwater, coastal and marine permits
  • Water supply development; aquifer testing
  • Water quality testing and monitoring
  • Water diversion permits
  • Brownfield redevelopment
  • NEPA and state program compliance
  • Wetland delineations and mitigations
  • Watershed inspections and hydrologic budgets
  • Fish, wildlife and endangered species studies
  • Environmental restorations
  • Archaeological and historic architecture surveys
  • National Historic Preservation Act Compliance


The Environmental Sciences Group at BL Companies have substantial experience performing single-site to multi-site assessments for a wide array of public and private clients. Based on the needs of each project, we bring together a group of professionals from various environmental disciplines to address the needs of the client and the project. We understand the complexity and time sensitivity issues and can grasp a client’s objectives, identify problems, solve critical site issues and provide solutions.

Contact: Mark Koellner, PG, Principal, Environmental Sciences

“To declare a national policy which will encourage productive and enjoyable harmony between man and his environment; to promote efforts which will prevent or eliminate damage to the environment and biosphere and stimulate the health and welfare of man; to enrich the understanding of the ecological systems and natural resources important to the Nation...”
— Richard M. Nixon, US President, preamble to the National Environmental Policy Act he signed into law in 1970