NCC 2016 Volume Three
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Section F On-Site Wastewater Systems

Section F On-Site Wastewater Systems

Part F1 On-Site Wastewater Management Systems

After F1.2(f) insert Tas F1.2(g) and (h) as follows:

Tas F1.2 General requirements

(g)

An on-site wastewater management system must be designed and constructed in accordance with a Certificate of Accreditation issued under .

(h)

The installation of an on-site wastewater management system must comply with the additional installation requirements set out in .

Tas Part F101 On-Site Wastewater Management Systems Additional Requirements

Tas F101.1 Scope

This Part is an addition to Part F1 and sets out the requirements for the connection of water flushed sanitary fixtures and sanitary appliances to an on-site wastewater management system other than a sewerage system. It also sets out the installation requirements for on-site wastewater management systems.

Tas F101.2 Installation requirements

(a)

Installation must be in accordance with Tas Figure F101.2 and in accordance with Parts C1 and C2 for pipework and venting arrangements.

(b)

An overflow relief gully must be installed and positioned so as to provide protection against surcharge of waste into a building.

(c)

An alternative to the ground vent may be used by extending a vent to terminate as if an upstream vent, with the vent connection between the last sanitary fixture or sanitary appliance and the on-site wastewater management system.

(d)

Inspection openings must be located at the inlet to an on-site wastewater management system treatment unit and the point of connection to the land application system and must terminate as close as practicable to the underside of an approved inspection opening cover installed at the finished surface level.

(e)

Access openings providing access for desludging or maintenance of on-site wastewater management system treatment units must terminate at or above finished surface level.

Tas Figure F101.2 Alternative venting arrangements

v3_Tas_Fig_F1012_2014.svg

Part F2 On-Site Liquid Trade Waste Systems

Delete F2.2(c) and insert Tas F2.2(c), (d) and (e) as follows:

Tas F2.2 General requirements

(c)

Where pre-treatment facilities are not required by the Network Utility Operator or the permit authority, FP2.3 or must comply with AS/NZS 3500.2 and and as appropriate.

(d)

If a Network Utility Operator accepts the discharge of a liquid trade waste to their sewerage system after pre-treatment—

(i)

the pre-treatment equipment or system is deemed to satisfy the Performance Requirements of , if the equipment or system is capable of discharging liquid trade waste at a quality set under a Consent to Discharge issued for that equipment or system by the Network Utility Operator; and

(ii)

that part of the installation used to convey the liquid trade waste after treatment must comply with AS/NZS 3500.2, , , and the Network Utility Operator's Guidelines, insofar as the provisions relate to the system.

(e)

The use of a product or system must comply with the details described in and insofar as they relate to the product or system installed in systems not connected to the Network Utility Operator's infrastructure.

(f)

The use of a product or system must comply with the details described in , and the Network Utility Operator's Guidelines, insofar as they relate to the product or system installed in systems connected to the Network Utility Operator's infrastructure.

Tas Part F201 Roofing of Liquid Trade Waste Generation Areas

Tas F201.1 Scope

(a)

This Part is an addition to Part F2 and sets out the requirements for the roofing of liquid trade waste generation areas to prevent ingress of stormwater to an approved disposal system other than a sewerage system.

(b)

Roofing requirements for systems connected to the Network Utility Operator's sewerage system must as a minimum comply with Tas Figure F201.2.

Tas F201.2 Installation requirements

(a)

When a liquid trade waste generating process does not fully occur within a building, suitable roofing must be installed to prevent the ingress of stormwater to the disposal system. For a structure where one or more sides are open to the weather, not less than 10 degrees from the vertical overhang of the roofing must be provided.

(b)

To ensure that surface water cannot flow onto the liquid trade waste generating process area a bund or other feature (speed hump) at least 150 mm high around the area must be installed. On the upper side of the area, stormwater drains alone are not adequate as stormwater flows will often bridge over the grate and enter the process area. The overall surface water flow across the site is to be considered and the height of the bund or other feature must be increased where the calculated stormwater flow will enter the process area.

(c)

This design is likely to allow wind driven rainwater to enter under the roof in extreme storm conditions. The roof must overhang by an amount not less than that shown in Tas Figure F201.2

Tas Figure F201.2 Roofing of liquid trade waste generation areas

v3_Tas_Fig_F2012_2014.svg

Tas Part F202 Liquid Trade Waste Products

Tas F202.1 Scope

This Part is an addition to Part F2 and depicts low risk trade waste products and installations connected to an approved disposal system other than a sewerage system.

Tas F202.2 Application

(a)

This Part applies to trade waste installations not connected to a Network Utility Operator's system.

(b)

Trade waste products or installations depicted in Tas Section F are considered low risk and may be used if they are installed in accordance with the details shown therein and the following.

(c)

Low risk liquid trade wastes can be described as those water-borne discharges other than sewage that are classified by the permit authority, as being low risk from causing harm to the environment and on-site wastewater management systems. These discharges must be trapped and partially treated before being permitted to enter the on-site wastewater management system.

Explanatory information

Explanatory information:

Examples of low risk liquid trade wastes are discharges from—

  1. food preparation in take-away shops, restaurants, hotels, motels and the like;
  2. laboratories in education institutions such as schools and universities; or
  3. service stations, vehicle detailing and washing.

It is the role of the permit authority to determine whether the trade waste discharge is high risk or low risk when installed in areas outside the jurisdiction of the Network Utility Operator.

Tas F202.3 General installation requirements

(a)

Location

Low risk trade waste appliances must be located as close as practicable to the fixtures and floor waste gullies served whether installed internally or externally and may be above or below ground. Portable appliances may only be installed above ground.

(b)

Covers

Trade waste appliances must be fitted with covers which can withstand vehicular or pedestrian traffic or other loads likely to be imposed on them and be readily removable by one person.

(c)

Materials

Trade waste appliances must be constructed of materials suitable for the nature of the liquid wastes likely to be discharged through the appliance.

(d)

Ventilation

Where airtight covers are fitted, trade waste appliances must be vented with either a DN 50 or DN 80 vent (refer to relevant figure). Outlet ventilation is to be provided by either a—

(i)

DN 100 riser from a disconnector gully outside a building (refer clause 4.6.2 AS/NZS 3500.2); or

(ii)

DN 50 vent from a disconnector gully at the outlet of a non-portable appliance inside a building (refer clause 4.6.5 AS/NZS 3500.2); or

(iii)

DN 50 vent from a DN 80 trap riser at the outlet of a portable appliance, inside a building (refer clause 4.6.5 AS/NZS 3500.2).

Trade waste appliance vents and outlet vents may be combined inside a building (refer clause 6.8.3 AS/NZS 3500.2).

(e)

Connections

Unless otherwise permitted by the permit authority, the plumbing and drainage installation upstream of the low risk trade waste appliance must comply with AS/NZS 3500.2 and be compatible to the nature of the waste.

A trap must be fitted to the outlet pipe of every appliance and sized as follows:

(i)

DN 50 minimum for a portable appliance with hydraulic loading up to 5 fixture units.

(ii)

DN 80 minimum for a portable appliance with hydraulic loading greater than 5 fixture units

(iii)

DN 100 minimum for all other appliances.

Tas F202.4 Installation diagrams and notes

The low risk trade waste products and installations depicted below may be used if they are installed in accordance with the diagrams and notes shown.

Tas Figure F202.4a Typical silt pit

v3_Tas_Fig_F2024a_2015.svg

Notes:

  1. The silt pit is to be connected as specified by the designer and authorised by the Permit Authority.
  2. The bucket is to be constructed of 3 mm min. thick mild steel plate with 4 rows of 10 mm diameter holes at 25 mm centres. The bucket must be hot dip galvanised after fabrication.
  3. Sizes shown are minimum permissible dimensions.
  4. All dimensions shown are in millimetres.

Tas Figure F202.4b Typical silt trap

v3_Tas_Fig_F2024b_2015.svg

Notes:

  1. The silt trap is to be connected as specified by the designer and authorised by the .
  2. The bucket is to be constructed of 3 mm min. thick mild steel plate with 5 rows of 10 mm diameter holes at 25 mm centres. The bucket must be hot dip galvanised after fabrication.
  3. Sizes shown are minimum permissible dimensions.
  4. All dimensions shown are in millimetres.

Tas Figure F202.4c Typical straining pit

v3_Tas_Fig_F2024c_2015.svg

Notes:

  1. The straining pit is to be connected as specified by the designer and authorised by the .
  2. The basket is to be constructed of 2.5 mm min. diameter mild steel wire woven to give 7 mm aperture widths on a 32 x 32 x 3 mm angle iron frame with mitred corners. The top is to be welded from angle iron frame. The basket is to be hot dip galvanised after manufacture. Alternatively the basket may be constructed from 3 mm min. mild steel plate with 6 mm diameter holes at 12 mm centres over the entire area of the basket. The basket is to be hot dip galvanised after manufacture.
  3. All dimensions shown are in millimetres.

Tas Figure F202.4d Typical straining trap

v3_Tas_Fig_F2024d_2015.svg

Notes:

  1. The straining trap is to be connected as specified by the designer and authorised by the .
  2. The basket is to be constructed of 2.5 mm min. diameter mild steel wire woven to give 7 mm aperture widths on a 32 x 32 x 3 mm angle iron frame with mitred corners. The top is to be welded from angle iron frame.
  3. The basket is to be hot dip galvanised after manufacture. Alternatively the basket may be constructed from 3 mm min. mild steel plate with 6 mm diameter holes at 12 mm centres over the entire area of the basket. The basket is to be hot dip galvanised after manufacture.
  4. Straining traps to be used in installations connected to the Network Utility Operator's sewerage system must comply with the requirements of the Network Utility Operator's Guidelines for pre-treatment device requirements.
  5. All dimensions shown are in millimetres.

Tas Figure F202.4e Typical grease interceptor appliance (for above or below ground installation)

v3_Tas_Fig_F2024e_2015.svg

Notes:

  1. The capacity of the grease interceptor appliance below the outlet is to be as specified in the design and authorised by the . The capacity of the interceptor shown is 1080 litres.
  2. Where not specified, the capacity below the outlet is to be equivalent to the maximum hourly discharge provided that the minimum capacity below the outlet is not less than 250 litres.
  3. As the contents of the unit may become slightly acidic, it is recommended that the internal concrete surfaces below outlet level be provided with an acidic resistant lining.
  4. If installed above ground the grease interceptor appliance may be constructed using other authorised materials provided adequate structural support for the grease interceptor appliance is provided.
  5. The grease interceptor appliance is to be located in a position so as to provide ready access for maintenance and inspection purposes.
  6. Where a grease interceptor appliance is to be installed outside a building, consideration should be given to fitting airtight covers, venting the chamber and providing a screwed cap and DN 50 vent to the disconnector gully.
  7. All dimensions shown are in millimetres.

Tas Figure F202.4f Typical portable grease interceptor appliance (for above ground installation)

v3_Tas_Fig_F2024f_2015.svg

Notes:

  1. The capacity of the grease interceptor appliance below the outlet is to be as specified in the design and authorised by the . The capacity of the interceptor shown is 162 litres.
  2. Where not specified, the capacity below the outlet is to be equivalent to the maximum hourly discharge provided that the minimum capacity below the outlet is not less than 100 litres.
  3. The interceptor and baffle is to be constructed of 6 mm unplasticised polyvinyl chloride (PVC-U); 0.79 mm min. galvanised sheet steel; 0.63 mm min. sheet copper or 316 grade stainless steel, all welded construction, or other authorised material.
  4. Airtight cover(s) (using lever clips) to be provided to the grease interceptor appliance and the vent is to be extended to open air in accordance with clause 6.8.3 of AS/NZS 3500.2.
  5. The grease interceptor appliance is to be located in a position so as to provide ready access for maintenance and inspection purposes.
  6. If the grease interceptor appliance is to be installed externally it is to be protected from direct sunlight.
  7. All dimensions shown are in millimetres.

Tas Figure F202.4g Venting of grease trap chambers

v3_Tas_Fig_F2024g_2015.svg

Tas Figure F202.4h Alternative (mechanical) venting of grease trap chambers

v3_Tas_Fig_F2024h_2015.svg

Tas Figure F202.4i Grease trap installation within multi-storey building

v3_Tas_Fig_F2024i_2015.svg

Tas Figure F202.4j Typical oil and petrol interceptor

v3_Tas_Fig_F2024j_2015.svg

Notes:

  1. The capacity of the interceptor appliance below the outlet is to be as specified in the design and authorised by the . The capacity of the interceptor shown is 1140 litres.
  2. Where not specified the capacity below the outlet is to be not less than 1140 litres.
  3. Airtight covers are required and are to be of a suitable size and be readily removable by one person. A 600 mm x 600 mm or 600 mm diameter cover is required over the inlet and outlet of the pit.
  4. Where subject to traffic loadings, suitable covers capable of withstanding such loads are to be provided.
  5. The vent is to be extended to the open air in accordance with clause 6.8.3 of AS/NZS 3500.2.
  6. The DN 100 cast iron pipe outlet fitting is to be manufactured in one piece.
  7. PVC-U shall not be used for the construction, connecting or venting of this unit.
  8. This interceptor may accumulate quantities of explosive and/or flammable materials and therefore care is to be exercised in the maintenance and general use of the interceptor.
  9. The interceptor is to be located in a position so as to provide ready access for maintenance and inspection purposes.
  10. Oil and petrol interceptors and/or treatment devices connected to the Network Utility Operator's sewerage system must comply with the requirements of the Network Utility Operator's Guidelines for pre-treatment device requirements.
  11. All dimensions shown are in millimetres.

Tas Figure F202.4k Typical acid neutralising tank

v3_Tas_Fig_F2024k_2015.svg

Notes:

  1. The capacity of the tank below the invert level of the outlet pipe is to be as specified by the designer and authorised by the . The capacity of the tank shown above is the minimum requirement of 27 litres between the marble chip level and the outlet level.
  2. The tank and fixed baffles are to be constructed of 6 mm min. unplasticised polyvinyl chloride (PVC-U) sheet; 0.63 mm min. acid resistant stainless steel all welded construction; or other authorised acid and alkali resistant material and construction methods.
  3. The diameter of the outlet pipe is to be at least one size larger than the inlet pipe (i.e. DN 65 inlet – DN 80 outlet). Where the diameter of the inlet pipe is DN 100, the diameter of the outlet may be DN 100.
  4. The three baffles are to be equally spaced through the tank length.
  5. The 32 x 32 x 25 mm deep PVC-U test block bracket is to be fitted as close as practicable to the outlet.
  6. The 150 x 25 x 25 mm cement mortar test block is to be supplied and fitted to the satisfaction of the .
  7. The size of the marble chips are to be within the range of 40 mm to 60 mm.
  8. The tank is to be located in a position so as to provide ready access for the fitting of the cement mortar test block, obtaining samples from the sampling valve, replacement of the marble chips and for ongoing maintenance purposes.
  9. Where the unit is to be located below ground level:
    1. The unit is to be surrounded with 100 mm min. thick concrete walls and base.
    2. The DN 25 sampling valve is to be omitted.
    3. The outlet level is to be no greater than 600 mm below surface level.
    4. The outlet pipe diameter is to be not less than DN 100.
    5. The outlet is to be connected to a disconnector gully fitted with a loose fitting grate or screwed cap.
  10. All dimensions shown are in millimetres.

Tas Figure F202.4l Typical mixing tank

v3_Tas_Fig_F2024l_2015.svg

Notes:

  1. The capacity of the tank below the invert level of the outlet pipe is to be as specified by the designer and authorised by the . The capacity of the tank shown above is the minimum requirement of 100 litres.
  2. The tank and baffles are to be constructed of 6 mm min. unplasticised polyvinyl chloride (PVC-U) sheet; 0.63 mm min. acid resistant stainless steel all welded construction; or other authorised acid and alkali resistant material and construction methods.
  3. The diameter of the outlet pipe is to be at least one size larger than the inlet pipe (i.e. DN 65 inlet – DN 80 outlet). Where the diameter of the inlet pipe is DN 100, the diameter of the outlet may be DN 100.
  4. The three baffles are to be equally spaced through the tank length.
  5. The 32 x 32 x 25 mm deep PVC-U test block bracket is to be fitted as close as practicable to the outlet.
  6. The 150 x 25 x 25 mm cement mortar test block is to be supplied and fitted by the water authority's authorised officer.
  7. Consideration should be given to the provision of adequate structural support for the tank.
  8. The tank is to be located in a position so as to provide ready access for the fitting of the cement mortar test block, obtaining samples from the sampling valve, replacement of the marble chips and for ongoing maintenance purposes.
  9. Where the unit is to be located below ground level:
    1. The unit is to be surrounded with 100 mm min. thick concrete walls and base.
    2. The DN 25 sampling valve is to be omitted.
    3. The outlet level is to be no greater than 600 mm below surface level.
    4. The outlet pipe diameter is to be not less than DN 100.
    5. The outlet is to be connected to a disconnector gully fitted with a loose fitting grate or screwed cap.
  10. All dimensions shown are in millimetres.

Tas Figure F202.4m Typical settling tank

v3_Tas_Fig_F2024m_2015.svg

Notes:

  1. The capacity of the tank below the invert level of the outlet pipe is to be as specified by the designer and authorised by the . The capacity of the tank shown above is the minimum requirement of 72 litres.
  2. The tank and baffles are to be constructed of 6 mm min. unplasticised polyvinyl chloride (PVC-U) sheet; 0.79 mm min. galvanised steel sheet; 0.63 mm min. or 316 grade stainless steel all welded construction; or other authorised acid and alkali resistant material and construction methods.
  3. The diameter of the outlet pipe is to be at least one size larger than the inlet pipe (i.e. DN 65 inlet – DN 80 outlet). Where the diameter of the inlet pipe is DN 100, the diameter of the outlet may be DN 100.
  4. The tank is to be located in a position so as to provide ready access for obtaining samples from the sampling valve and for ongoing maintenance purposes.
  5. Where the unit is to located below ground level:
    1. The unit is to be surrounded with 100 mm min. thick concrete walls and base.
    2. The DN 25 sampling valve is to be omitted.
    3. The outlet level is to be no greater than 600 mm below surface level.
    4. The outlet pipe diameter is to be not less than DN 100.
    5. The outlet is to be connected to a disconnector gully fitted with a loose fitting grate or screwed cap.
  6. All dimensions shown are in millimetres.
Permit Authority
Permit Authority