Avanti Corporation provides engineering and environmental regulatory support services. Its services include ecological and human health benefits assessments/environmental assessments; evaluation of qualitative, quantitative, monetized, and non-monetized endpoints of contaminants, fate and transport processes, water quality and non-water quality, endangered species impacts, and commercial and recreational fisheries impacts; and NPDES program regulations, individual and general permits, and implementation programs, including pollution control technology assessments, permit conditions and limitations development, permit streamlining analyses, water quality analyses, waste load allocations, receiving water and compliance monitoring, ocean discharge criteria evaluations, endangered species and coastal zone management plan consistency assessments, and litigation support and testimony, as well as public hearing logistics, materials, and comment responses. The company’s services also include engineering support to environmental management solutions, such as national technology-based effluent limitation guidelines, professional judgement permit limitations for NPDES general permits, and analyses of regulatory options, including underground injection, landfilling, and on-site discharge; and regulatory development support, including industry and effluent characterizations, field and facility inspections, pollution control technology assessments and engineering analyses, cost analyses, public comment issues analysis and technical comment responses, administrative record compilation, litigation support, and guidance and public hearing support. Avanti Corporation is based in Annandale, Virginia.