NWW Tree Pit Maintenance

• Document No.

• Audit Title

• Client / Site

• Conducted on

  Date

• Prepared by

• Location
  Address

• Personnel

• Weather conditions: temperature, rainfall, etc.

• Date of last rainfall (approx)

  Date

• Images of site (attach)

  Media

CIVIL COMPONENTS TO INSPECT

INLET

• Evidence of erosion

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Blockage

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Damage

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Standing water

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Maintenance undertaken

• Further action required

OUTLET

• Name the structure(s)

• Evidence of erosion

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Damage

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Maintenance undertaken

• Further action required

BIOFILTER SURFACE

• Filter media is draining freely

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

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

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Surface scour

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Major sediment accumulation on surface of tree pit

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Depressions

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Impermeable or clayey surface on the filter media

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

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

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Even depth and distribution of mulch layer

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

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

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Mulch is touching the plant stems.

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Maintenance undertaken

• Further action required

INSPECTION OPENINGS

• Water level is below filter media level

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Visible surface clogging

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Sediment accumulation in underdrain system

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• System needs to be reset

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Maintenance undertaken

• Further action required

• Plants healthy, free from disease and vigorously growing

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Need for replanting

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

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

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

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

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Evidence of dumping

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Damage by pest animals

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Damage by insects

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Maintenance undertaken

• Further action required

• Damage by vandalism

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

OVERVIEW

• Overall inspection observations

• Actions to be undertaken

• Further comments

• Time spent at site.