Approved Plans and Documents - OPW22/0303

                  9 February 2023




                 1 INTRODUCTION
                 The following Maintenance Plan addresses the inspection and maintenance procedures to be
                 undertaken for the on-site stormwater quality improvement devices and rainwater tanks 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 basins and rainwater tanks 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 and rainwater tank
                 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.

                 It is anticipated that the rainwater harvesting tank will not be connected to the roof of the
                 development until such time as the site has been largely completed. This will ensure minimal
                 maintenance is required for the rainwater harvesting tank during the construction phase. Prior to
                 connection the tank should be flushed in accordance with the manufacturers specifications and
                 guidelines.




                  Excellence with Economy in Engineering                                                                  3
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Document Set ID: 22315062
Version: 1, Version Date: 20/02/2023