Attachment 1 - Op Works Negotiated Decision Notice · OPW11/0335

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OPW 11/0335

 

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contain respectively, in Section 3.15 of the Construction and Establishment Guidelines:
Swales, Bioretention Systems and Wetlands (Water by Design, 2009) are completed and
the supporting information and data required by the forms attached. These forms must be
submitted to Council prior to issuing of a final compliance certificate in conjunction with
certification from the RPEQ that the device has been constructed in accordance with the
Construction and Establishment Guidelines: Swales, Bioretention Systems and Wetlands
(Water by Design, 2009), all conditions of approval, and the approved engineering
drawings.

A construction hold point must be established once the biofiltration device nearest the
designated carpark underdrainage pipe work is installed. At this time an inspection must
be arranged with Council’s delegate. At the time of inspection, a sample of the drainage
layer, transition layer, and filtration media materials for both biofiltration devices must be
stockpiled on-site. Laboratory results must be provided for the filter media which
demonstrate that the media complies with the specifications contained in the latest version
of the “Guidelines for Soil Filter Media in Bioretention Systems” (produced by the Facility
for Advancing Water Biofiltration) and that the minimum hydraulic conductivity specified on
the approved engineering plans will be achieved. The drainage layer, transition layer, and
filtration media materials must not be installed until the catchment draining to the
bioretention device has 70% groundcover as determined by Council’s delegate.

Prior to issuing of a final compliance certificate, the results of in-situ hydraulic conductivity
testing conducted in accordance with FAWB PRACTICE NOTE 17: In Situ Measurement of
Hydraulic Conductivity Belinda Hatt, Sebastien Le Coustumer April 2008 are to be
provided for the bioretention filter media. The filter media is to achieve the design hydraulic
conductivity prior to issuing of a final compliance certificate, unless it can be demonstrated
that the resulting hydraulic conductivity will not result in a significant reduction in the basins
performance.

The rainwater collection tanks associated with Stage 1 to be installed onsite must have a
total volume of 100 kL to service 100% of the total roof catchment area as described in
the approved SWMP (Simmonds and Bristow Pty Ltd, Essence of Peregian SWMP,
S&ECP, March 2012). Rainwater harvested in the tank(s) must be re-used for internal non
potable uses and outdoor uses.

Prior to commencement of use, the applicant must provide a certificate from a suitably
qualified person (plumber, engineer etc) to certify that the rainwater collection tank(s) and
associated reticulation has been installed in accordance with approved plans and
conditions of approval.

Prior to issuing of a final compliance certificate, the applicant must provide a detailed
maintenance plan for the stormwater system which is to outline requirements for both the
construction and operational phases and specify the regular maintenance of the
stormwater system along with the long-term management such as the replacement of the
bio-retention filter. Records of inspection, monitoring and maintenance shall be
maintained by the building owner / operator and made available to Council on a regular
basis (timing to be detailed in the plan). The maintenance plan shall comply with the
requirements of the Development Design Planning Scheme Policy and the maintenance
plan provisions of the WSUD Technical Design Guidelines for South East Queensland
(Healthy Waterways, 2006).

The development must be provided with approved Permanent signage, in relation to water
quality, which shall be erected educating the public of the function of the bioretention
basins. Suggested wording for the water quality signage for each bioretention basin is as
follows: “BIORETENTION BASIN - This bioretention basin reduces the pollution of our
waterways by reducing the amount of heavy metals, litter, suspended solids, and nutrients
discharged to Lake Kawana”. At the pre-start meeting submit and have endorsed by
Council’s delegate detailed drawings showing the design of the signage. The dimensions,
standard and presentation of construction, and locations of such signage shall be detailed
on the drawings.

FM1509s/2-13/04/2011 Page 5 of 24