25-11-22 Operational Management and Maintenance Plan_Issue A

 25 November 2022



1 INTRODUCTION
The following Maintenance Plan addresses the inspection and maintenance procedures to be
undertaken for the on-site stormwater quality improvement devices during the construction and
operational phases of the project. During the construction phase and maintenance period, the
Developer shall be responsible for the monitoring and maintenance of the bioretention basin on
site. Thereafter, the site manager shall be responsible for ongoing monitoring and maintenance.

All maintenance and amendments necessary to achieve and/or maintain the required treatment
performance must be recorded and appropriate steps taken to inform those responsible of any
required actions.

Layout plans and details of the proposed stormwater quality treatment devices are attached in
Appendix 1.

For further details of the development’s stormwater quality treatment devices, refer to the
Stormwater Management Plan prepared by MPN Consulting.

2 CONSTRUCTION PHASE
Bioretention basin construction shall be undertaken in accordance with the Healthy Waterways
Construction and Establishment Guidelines: Swales, Bioretention Systems and Wetlands Version
1.1 April 2010.

Filter media in the bioretention basin is only to be installed once the “Construction” Stage involving
the Civil Works required to create the land forms associated with the development and installation
of the services. Once this has been completed, the construction of the functional elements of the
bioretention basin can be commenced as part of the early landscaping works prior to the “Building
Phase” of the development.

During the “Building Phase” of the development, a protective layer shall be placed over the filter
media. This protective layer consists of a geofabric layer with 25mm topsoil and a turf layer, with
silt fences around the boundary of the basin. After completion of the “Building Phase”, the
geofabric and turf are to be removed with the filter media reprofiled and planted in accordance
with the proposed landscape design. The above protection method is consistent with Option 1
detailed in the Construction and Establishment Guidelines.

Bioretention basin construction inspection checklists and sign off forms from the Construction and
Establishment Guidelines are attached in Appendix 2.



3 OPERATIONAL PHASE
3.1.1 General

Vegetation in the bioretention basin plays a key role in maintaining the porosity of the filter media
and a strong healthy growth of vegetation is critical to its performance. The establishment of
plants after the construction phase and ongoing maintenance is therefore a fundamental part of
the operation of the entire device.


 Excellence with Economy in Engineering                                                                  3
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