NWW Biofilter 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 OF BIOFILTER 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

• 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

• Outlet freely draining

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Maintenance undertaken

• Further action required

OTHER STRUCTURES (pits, pipes, access ramps, walls, rock protection)

• Name the structure(s)

• 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

• Maintenance undertaken

• Further action required

BATTERS & BUNDS

• Evidence of erosion

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Maintenance undertaken

• Further action required

SEDIMENT ACCUMULATION

• Sediment forebay less than 75% full

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Major sediment accumulation on surface of biofilter

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Maintenance undertaken

• Further action required

FILTER MEDIA 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

• 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

• Surface scour

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Depressions

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Major algal growth (less than 10% of biofilter area is permissible)

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Moss growth present

  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

• Sediment accumulation in underdrain system

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Maintenance undertaken

• Further action required

LANDSCAPE COMPONENTS

MULCH LAYER (where applicable)

• 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 inlet and outlet.

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Mulch is not touching the plant stems.

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Maintenance undertaken

• Further action required

VEGETATION

• Greater than 90% vegetation cover on filter media

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Greater than 90% vegetation cover

  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

• Less than 10% of batters covered in weeds.

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Plants healthy, free from disease and vigorously growing

  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

LITTER

• 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 (e.g. building waste)

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Maintenance undertaken

• Further action required

OIL SPILLS/INFLOWS

• Evidence of oil spills/flows

  Select Yes No Actioned

  • Yes
  • No
  • Actioned

• Maintenance undertaken

• Further action required

OVERVIEW

• Overall inspection observations

• Actions to be undertaken

• Further comments

• Time spent at site.