23616 DA - Change a Development Approval [As Published] · 132003.221132.4

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conjunction with a Development Permit for Operational Works. Such calculations shall
include any remedial measures necessary to rectify the defects in the existing system.
Where proposed site drainage is to be connected to the existing system, the
calculations shalt clearly demonstrate the adequacy of the existing drainage network to
accept the additional stormwater flows.

The design plans detailing surface levels, which shall be controlled across the site of
the development to create a major storm event overland flow path system to cater for
the 1:100 year design storm, shall be submitted in conjunction with a Development
Permit for Operational Works. Any overland flow from external catchments shall be
accepted and incorporated in the major event surface flow drainage system through the
site. Overland flows shail be discharged in a safe manner and the product of velocity
time depth shall not exceed 0.4m?/sec.

The design plans are to show how stormwater runoff within and from the site is to be
controlled both during construction and permanently. The plans are to indicate
measures to be taken to prevent erosion and the export of sediment from the site and
will embrace the principles set out in the Institution of Engineers Australia Engineering
Guidelines for Queensland Soil Erosion and Sediment Control, June 1996. Designs
shall also incorporate the principle of “no net increase" in nutrients and other pollutants
from the developed site. This may require the provision of a drainage system that
allows first flush (first 12mm of rainfall) to be collected and treated prior to release into
the downstream drainage system.

All site drainage shall be by means of gravity systems.

A minimum floor level freeboard of 0.5m shall be provided for habitable and storage
areas above the top water level of the stormwater overland flows.

The following steps shall be undertaken prior to commencement of any construction:-

28.1 The Principat Contractor shall given Council's Inspector seven (7) days' notice of
intention to commencement works.

28.2 The Principal Contractor or any of his subcontractors shall not undertake any
works unless each contractor has public liability in the sum of $10,000,000 and
copies of current public liability insurance policies are submitted to Council's
inspector.

28.3 The Principal Contractor shall nominate a site representative and give a
telephone number that can reach the site representative at any time during a 24-
hour day.

28.4 The site representative shall arrange to meet on-site with Council's inspector to
obtain Council's requirements for construction access.

28.5 All signage, including that for safety during construction, shall be in accordance
with the Manual of Uniform Traffic Control Devices and Department of Transport
(Main Roads Division) Roadworks Signing Guide.

Prior to excavating any material to be used for fill on this site, a Development Permit for
Operational Works shall have been obtained for the site from which the excavated
material is taken. A soil report shall be submitted with the application certifying that the
material is free of acid sulphate soils and other deleterious materials.

The transportation of all materials to and from the site shall be undertaken in a manner
such that no particulate matter scapes onto a public road. All vehicles carrying

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