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Third party inspection of erosion and sedimentation control during construction activities is essential for a project's ability to achieve and maintain compliance with the Maine Department of Environmental Protection (MDEP) and municipalities regulations. For a typical project, Acorn Engineering will provide the following services:

  • Attend pre-construction meeting with agency, contractor, and developer.
  • Conduct site visits to review erosion controls per a project's individual permit requirements
  • Develop inspection reports and site observation log
  • Verify completion of permanent erosion control measures
  • Prepare condition compliance submission for the MDEP and/or municipality.


The Maine Department of Environmental Protection and municipalities require Third Party inspections of stormwater facilities after construction to be sure they are being maintained. Our personnel are recognized by the Maine DEP as Qualified Post - Construction Stormwater Inspectors in addition to industry leading stormwater certifications.


Acorn Engineering may perform the following services for a typical project:

  • Assess the existing condition of a parcel's stormwater infrastructure to determine existing water quality measures and cost effective retrofits to maximize stormwater credits.
  • Perform site observations in conformance with the approved project's Operation and Maintenance (O&M) Plan such as:
    • Detention Basins
    • Vegetated Buffers
    • Bioretention Cells
    • Catch Basins
    • Permanent erosion control measures
    • Subsurface Detention Basins
  • Prepare observations report suitable for the municipality and MDEP
  • Coordinate necessary maintenance activities.
  • File individual observation reports
  • Compile 5 year report for submission to the MDEP



  • Baseline Documentation
  • Field Inspections & Reports
  • Sub-Centimeter GPS Mapping
  • GIS Analysis
  • Aerial Reconnaissance
  • Property Management Plans & Training
  • Stakeholder Meetings and Outreach
  • Design, Repair and Retrofit Services