• Document No.

  • Audit Title

  • Client / Site

  • Conducted on

  • Prepared by

  • Location
  • Personnel

  • Weather conditions: temperature, rainfall, etc.

  • Date of last rainfall (approx)

  • Images of site (attach)



  • Evidence of erosion

  • Blockage

  • Damage

  • Standing water

  • Maintenance undertaken

  • Further action required


  • Name the structure(s)

  • Evidence of erosion

  • Damage

  • Maintenance undertaken

  • Further action required


  • Filter media is draining freely

  • Water ponding on surface of biofilter for more than 12 hours after rainfall

  • Surface scour

  • Major sediment accumulation on surface of tree pit

  • Depressions

  • Impermeable or clayey surface on the filter media

  • Major surface crusting (<3mm depth across less than 10% of the filter area is permissible)

  • Even depth and distribution of mulch layer

  • Surface of mulch layer is at least 100 mm below the top of the outflow pit.

  • Mulch is touching the plant stems.

  • Maintenance undertaken

  • Further action required


  • Water level is below filter media level

  • Visible surface clogging

  • Sediment accumulation in underdrain system

  • System needs to be reset

  • Maintenance undertaken

  • Further action required

  • Plants healthy, free from disease and vigorously growing

  • Need for replanting

  • Less than 10% of the filter media surface covered in weeds.

  • Filter media and batters free of litter (i.e. less than 1 piece per 4 sqm)

  • Evidence of dumping

  • Damage by pest animals

  • Damage by insects

  • Maintenance undertaken

  • Further action required

  • Damage by vandalism


  • Overall inspection observations

  • Actions to be undertaken

  • Further comments

  • Time spent at site.

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