Site and Soil Evaluation

Sighting of the Land Application Area:

The current Code of Practice for On-site Sewerage Facilities (Queensland Plumbing and Wastewater Code) provides
minimum horizontal/vertical separation distances for Land Application Areas. They are as follows;


             Sub-Surface Land Application Areas (ADVANCED SECONDARY)
             Property Boundaries Upslope from the Area      -     2.0m
             Property Boundaries Downslope from the Area    -     4.0m
             Dwellings or buildings                         -     4.0m
             In ground swimming Pools                       -     6.0m
             In-ground potable Water Tanks                  -     6.0m
             Dams, Watercourses or Bores                    -    10.0m
             Vertical distance to water table               -     0.6m
             Driveway                                       -     2.0m                     (Upslope);
                                                                  4.0m                     (Downslope)
             Footpath                                       -     1.0m                     (Upslope);
                                                                  2.0m                     (Downslope)


NOTE:- REFER TO QUEENSLAND PLUMBING AND WASTEWATER CODE FOR SITING OF ON
       SITE SEWERAGE FACILITY FOR LOCATION OF TREATMENT PLANT. TREATMENT
       PLANT MUST BE 150mm ABOVE Q100 FLOOD LEVEL.

In no instance shall Effluent be used for irrigation of fruit or vegetables.
No Vehicle loading or children’s recreational areas to be applied or constructed within the Land
Application Area.


System Maintenance:

The owner of the property shall ensure that all manufacturers maintenance procedures are undertaken in
accordance with the local authority and the manufacturers recommendations for what ever system is installed.
The system must be inspected/tested on a regular basis in accordance with the manufacturers requirements and
all Statutory requirements from relevant local and state government agencies.

NOTE: No Antibacterial products or disinfectant to be used in the system. Refer to manufacturers
guidelines on safe products to be used in the system.


System Installation:

Installation of the system must be undertaken by a qualified plumber in accordance with local authority
requirements and in accordance with the relevant Australian Standards and Australian Building Code.


Definitions:

Design Loading Rate (DLR)
The long term acceptance rate (LTAR), reduced by a factor of safety, expressed in L/m2/day or mm/day as applied
to the horizontal design area of a land application system.
Design Irrigation Rate (DIR)
The loading rate that applies to the irrigation of a land application area with effluent of a secondary quality. It is
expressed in L/m2/day or mm/week. If a spray irrigation system is used, the secondary effluent is subject to
continuous disinfection.
Durable Aggregate
An aggregate with the grading requirements specified in AS 2758.1 for single-size course aggregate for nominal
sizes from 20mm - 40mm.



   AUSTRALIAN SOIL INVESTIGATIONS                              7                               ASI Ref: 220144(A)