AF OSSA Page 1 of 8
Last Updated: 24/05/2018
Onsite Wastewater Disposal Site & Soils
The objective of this form is to collate the required site and soil information that will support QLDC with
evaluating the risks associated with installing any proposed Onsite Wastewater Disposal systems on a
new subdivision or greenfield site.
This form can be used in conjunction with AF OSW which is designed to cover both the site assessment
as well as the system design review.
The design standard for waste water treatment and effluent disposal systems is AS/NZS 1547:2012. All
references within this form relate to this standard.
RISK BASED APPROACH
QLDC has adopted a risk based approach which involves evaluating key factors relating to the site and
soil features to ensure that any risk to environment or public health is fully mitigated. The key potential
risks that QLDC will consider include, but are not limited to, the following:
Loss of amenity service due to technology failure, power outage
High capital and/or operating costs
Slope instability on the steeper sites
Risk to cultural values
Nutrients (nitrogen and phosphorus) and emerging contaminants
HIGH RISK APPLICATIONS
Throughout this application form there are a number of information fields that are highlighted in red.
These relate to key risk factors that the system designer must consider during their design process. If
these risks are present then an explanation of what design mitigations have been taken is required.
For systems that breach the requirements of Section 3, you will be required to raise an application with
the Otago Regional Council for a Resource Consent. Once the ORC Resource Consent has been granted
it can be referenced as part of the QLDC Building Consent Application.
QLDC reserves the right to engage expert peer review of applications that are either very high risk, or
system designs which appear to have inadequate design mitigations in place. The cost of this will be on-
charged to the applicant as part of their building consent fees.