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25-11-22 Operational Management and Maintenance Plan_Issue A
Plans and drawings: the text below has words only, no drawings.
OPERATIONAL MANAGEMENT
AND MAINTENANCE PLAN
Noosa Medihub
Eenie Creek Road Noosaville
Prepared By:
MPN CONSULTING PTY LTD
Level 5
39 Sherwood Road
Toowong
Queensland
4066 • Australia
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REVISION STATUS
MPN Reference No: 8662
Client: Stockwell Developments Pty Ltd
Site Address: 28 Eenie Creek Road Noosaville
Report Title: Operational Management & Maintenance Plan
DOCUMENT CONTROL
Version Date Author Reviewer Approved RPEQ
Issue A 25/11/2022 Lachlan Lachlan Stephenson 16903
Stephenson
Excellence with Economy in Engineering 1
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Table of Contents
1 INTRODUCTION 3
2 CONSTRUCTION PHASE 3
3 OPERATIONAL PHASE 3
3.1.1 General ............................................................................................................................................................ 3
3.1.2 Maintenance Program ............................................................................................................................... 4
3.1.3 Watering ......................................................................................................................................................... 5
Table of Tables
Table 1 - General recommended program of inspection and maintenance – Bioretention Basin 5
Table of Appendices
Appendix 1 MPN Plans 6
Appendix 2 Bioretention Basin Construction Checklists and Forms 7
Appendix 3 Bioretention Basin Maintenance Checklist 8
Excellence with Economy in Engineering 2
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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 https://mpncnetau.sharepoint.com/sites/administration/shared documents/8000-8999/8600- 8699/8662/reports/25-11-22 operational management and maintenance plan_issue a.docx`
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Overflow pits require careful monitoring, as these are prone to scour and a build-up of sediment,
debris and gross pollutants. Debris can block outlets and can be unsightly. Inspection and removal
of debris should be undertaken regularly and debris should be removed whenever it is observed
on-site.
3.1.2 Maintenance Program
Maintenance of the bioretention basin would involve the following activities:
• Removal of sediment where it is smothering the bioretention basin vegetation;
• Manual removal and management of invasive seeds. Note herbicides should not be used as
they would contaminate the downstream receiving waters;
• Debris removal in the bioretention basin and adjoining areas;
• Repair any damage to the profile as a result of scour, rill erosion or vehicle damage by
replacement of appropriate fill (to match onsite soil) and revegetation;
• Till the bioretention basin surface, or remove the surface layer, if there is evidence of
clogging;
• Regularly water the basin vegetation until plants are established and actively growing;
• Fertilising of plants with environmentally friendly products;
• Removal of plants that have died and replacement with plants of equivalent size and
species as detailed in the Landscape Architect’s planting schedule;
• Pruning to remove dead or diseased vegetation material and to stimulate growth;
• Vegetation pest monitoring and control; and
• Inspection and repair of the subsoil drainage system.
Table 1 below sets out the recommended frequency for inspections and maintenance of
bioretention basins during the Operational Phase. Note the Schedule is a guideline only. Routine
clean out and maintenance should be scheduled based on the outcome of routine inspections.
Excellence with Economy in Engineering 4
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Schedule of Site Visits
Purpose of Visit Frequency J F M A M J J A S O N D
Routine Inspection Monthly √ √ √ √ √ √ √ √ √ √ √ √
Annual Inspection Yearly √
Routine Maintenance Twice Yearly √ √
Routine Clean-Out of
Every Two Years √
Sediment
Table 1 - General recommended program of inspection and maintenance – Bioretention Basin
For additional information and guidance on how to undertake maintenance activities, refer to the
Healthy Waterways: Maintaining Vegetated Stormwater Assets Version 1 February 2012.
A bioretention basin inspection and maintenance checklist from the Maintaining Vegetated Assets
Guideline is attached in Appendix 3.
3.1.3 Watering
Time of year and the climate will determine the frequency of watering. However, during
establishment, regular watering is essential for plants. Successfully establishing plants is
dependent on the frequency of watering, which in turn is dependent on rainfall, the maturity of the
plant stock and the water-holding capacity of the soil. The following watering program is generally
adequate but should be adjusted to suit site conditions:
• Week 1 – 6 5 visits per week
• Week 7 – 10 3 visits per week
• Week 11 – 12 2 visits per week
In the absence of rain, it is recommended that each plant receives 2.5 – 5.0 litres of water per week
during the first six weeks (40mm of watering per week during establishment).
After the initial four-month period, watering may still be required, particularly during the first
winter or dry period. Watering requirements for healthy vegetation can be determined by ongoing
inspections.
Excellence with Economy in Engineering 5
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Appendix 1
MPN Plans
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Appendix 2
Bioretention Basin Construction Checklists and Forms
Excellence with Economy in Engineering 7
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BIORETENTION SYSTEM CONSTRUCTION & ESTABLISHMENT SIGN-OFF FORMS Asset |.D. System location: DANo. ee Civil drawing no. Landscape drawing no. Area: Catchment Area (ha): Bioretention Area (ha): ROLE/STAKEHOLDER COMPANY CONTACT NAME CONTACT DETAILS Developer Site superintendent (civil) Site superintendent (landscape) Bioretention designer Civil engineer Landscape architect Civil contractor Landscape contractor Council compliance officer CHECKLIST OF SIGN-OFF FORMS SIGN-OFF FORM DATE COMPLETED NAME OF SIGNATORY & ROLE SIGNATURE (E.G. SUPERINTENDENT) Pre-Start Meeting Form A — Earthworks & Functional Structures Form B — Under-Drainage Form C — Bioretention Media Form D — Finished Levels Form E — Coarse Sediment Forebay Form F — Protective Measures Form G — Landscape Installation Form H — Landscape Establishment elines € Walel bygesign 109
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PRE-START MEETING List pre-start meeting attendees who are to sign indicating they have attended the meeting and understand the design intent, construction and establishment process. Location Date ROLE/STAKEHOLDER COMPANY CONTACT NAME CONTACT DETAILS Developer Site superintendent (civil) Site superintendent(landscape) Bioretention designer Civil engineer Landscape architect Civil contractor Landscape contractor Other Other Other Comments (attach and refer to additional pages if necessary) Actions (attach and refer to additional pages if necessary) io woterbyd ON Construction and Establishment Guidelines
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FORM A — EARTHWORKS AND FUNCTIONAL (HYDRAULIC) STRUCTURES Purpose: To ensure earthworks bulking out, trimming and profiling and the key levels of functional (hydraulic) structures are in accordance with design drawings and specifications. The earthworks and structures dictate the movement of stormwater through the bioretention system and are a critical element in the function of the system. ITEMS CHECKED As constructed survey completed and | attached to this form Photos taken and attached to this form | Set-out of system is correct Base levels are at correct elevation (£50 mm) Base at correct grading (0.5%) fe SATISFACTORY es ACTION (IF UNSATISFACTORY) INITIAL Punch out holes in overflow pit are correct size, correct level and above invert level of outlet pipe (+25 mm) Overflow pit is correct size and crest and invert is at correct level (25 mm) Outlet pipe invert levels are correct (upstream and downstream) (£25 mm) Outlet pipe is free dra Overflow weir (if required) is correct length and at correct level +25 mm) | Overflow weir (if required) is keyed | into bund Bunds/embankments surrounding the system are at correct levels or above | HOLD POINT: Superintendent and bioretention designer inspection and sign-off before proceeding. Comments (attach and refer to additional pages if necessary) NB: As constructed survey and drawings and photos attached. Signed by superintendent: Print name: Date: Signed by bioretention designer: Print name: Date:
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FORM B — UNDER-DRAINAGE Purpose: To ensure under-drainage is installed correctly before the bioretention media is installed. ITEMS Base of system free from debris Liner (typically filter cloth) correctly installed There is no fabric ‘sock’ around the under- drainage Correct under-drainage has been supplied and slotted at 2 mm or smaller Under-drainage pipes are laid at the correct spacing (small bioretention system 1.5 m, large system 2 m) Required grade (verified using level or string line) Under-drainage pipes laid at required grade (verified using level or string line to achieve design level 25 mm and 0.5% grade) CHECKED SATISFACTORY Alljunctions and connections have been appropriately sealed Top of clean out points at design level (i.e. approximately 50-150 mm above filter media surface ) ACTION (IF UNSATISFACTORY) HOLD POINT: Superintendent and bioretention designer inspection and sign-off before proceeding. Comments (attach and refer to additional pages if necessary) NB; As constructed survey and drawings and photos attached Signed by superintendent: Print name: Date: Signed by bioretention designer: Print name: Date: INITIAL
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FORM C — BIORETENTION MEDIA Purpose: To ensure that the media placed in the system meets the required specifications and that there is a record of the media being delivered to site. To ensure media layers are installed correctly and meet the design and specification requirements. SOURCING, TESTING AND SUPPLYING BIORETENTION MEDIA ACTION (IF DRAINAGE LAYER CHECKED SATISFACTORY, UNSATISFACTORY) INITIAL Meets the specifications | Meets the required hydraulic conductivity (4,000 mm/hr) Delivery supply docket certifies that the material delivered is the material tested (delivery docket attached) TRANSITION LAYER SUPPLY Meets the specifications Supplier certification provided (certification attached) Delivery supply docket certifies that the material delivered is the material tested | (delivery docket attached) | FILTER MEDIA SUPPLY Meets the FAWB's Guideline Specifications for Soil Media in Bioretention Systems (2008) Meets the required hydraulic conductivity (100-500 mm/hr, 750 mm/hr maximum) Frequency of laboratory testing completed in accordance with Section 3.5 (results of testing attached) Supplier certification provided (certification attached) Delivery supply docket certifies that the material delivered is the material tested (delivery docket attached) HOLD POINT: Superintendent or bioretention designer inspection and review of test results and certifications before proceeding. Comments (attach and refer to additional pages if necessary)
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FORM C — BIORETENTION MEDIA (CONT.) INSTALLATION OF BIORETENTION MEDIA Base of system free from debris Drainage layer (fine gravel) installed to correct depth (+25 mm) Transition layer (coarse sand) installed to correct depth (+25 mm) Placement of filter media completed to avoid compaction of media and using at least two lifts Filter media installed to correct depth ACTION (IF SATISERCTORY, UNSATISFACTORY) INITIAL Light, even compaction applied to remove air gaps (e.g. light roller or single pass with a ‘pozitrack’ bobcat) Spreader bar used to flatten surface of filter media Sediment fences in place INSPECTION: Superintendent and bioretention designer inspection and sign-off to occur while installation of media is occurring. Photos must be taken by the superintendent, the bioretention designer or the contractor. Comments (attach and refer to additional pages if necessary) NB: Laboratory test results, certification, delivery dockets and photos attached Signed by superintendent: Print name: Date: Signed by bioretention designer: Print name: Date:
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FORM D — FINISHED LEVELS Purpose: To ensure finished levels of system surface and bunds are correct and meet the design. ACTION (IF ITEMS CHECKED SATISFACTORY UNSATISFACTORY) INITIAL | Landscaping topsoil applied to | surrounding bunds to achieve design levels As-constructed survey of system surface | and surrounding bunds completed Final constructed levels are consistent with design levels Under-drainage clean-outs extended 50- 150 mm above filter media Under-drainage pipes flushed to remove initial ingress of material HOLD POINT: Superintendent and bioretention designer inspection and sign-off before proceeding. Comments (attach and refer to additional pages if necessary) NB: As constructed survey and drawings and photos attached Signed by superintendent: Signed by bioretention designer: Print name: Print name: Date: Date:
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FORM E — COARSE SEDIMENT FOREBAY Purpose: To ensure the coarse sediment forebay is constructed correctly. ACTION (IF ITEMS CHECKED SATISFACTORY UNSATISFACTORY) INITIAL Extent of coarse sediment forebay correctly set out Rocks to be used to line base of forebay are correct size and shape | | Base of constructed forebayisflatand | | set at the correct level below the surface | of the filter media Rocks placed for energy dissipation are location Interface between forebay and filter media is structurally sound and not prone | | | of appropriate size and are in correct | | to collapse HOLD POINT: Superintendent or bioretention designer inspection and sign-off before proceeding. Comments (attach and refer to additional pages if necessary) NB: As constructed survey and drawings and photos attached Signed by superintendent: Signed by bioretention designer: Print name: Print name: Date: Date:
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FORM F — PROTECTIVE MEASURES Purpose: To ensure protective measures are correctly installed to protect the bioretention system while building is occurring in the catchment Protection option adopted (Option 1, 2 or 3) OPTION 1 — SURFACE PROTECTION DURING BUILDING PHASE Continuous sediment fences installed around perimeter of filter media and top of batter. Where landscape works are not to commence immediately then cover batters with filter cloth. Protective covering (filter cloth + 25 mm topsoil + turf) installed across entire filter media area of system. OPTION 2 — BYPASS AND EARLY ESTABLISHMENT Continuous sediment fences installed around perimeter of filter media and top of batter. CHECKED CHECKED SATISFACTORY SATISFACTORY ACTION (IF UNSATISFACTORY) ACTION (IF UNSATISFACTORY) INITIAL INITIAL Where landscape works are not to commence immediately then cover batters with filter cloth. Temporary bund installed (where required) to prevent stormwater runoff from entering bulk of system. Bund keyed into batters of bioretention and crest level higher than pits and weirs. Temporary protective covering (filter cloth + 25 mm topsoil + turf) installed within bunded area. OPTION 3 - SEDIMENT BASIN AND BIORETENTION FUNCTION Continuous sediment fences installed around perimeter of filter media and top of batter Sediment basin installed upstream of bioretention in accordance with either (including hydraulic structures): * WSUD Technical Design Guidelines for SEQ (SEQHWP) + Local erosion and sediment control guidelines or Best Practice Erosion and Sediment Control (IECA, 2008) Suitable access provided to sediment basin for clean out Bioretention system installed downstream of sediment basin Protective covering (filter cloth + 25mm topsoil + | turf) installed across entire filter media areaof =| basin. CHECKED SATISFACTORY HOLD POINT: Superintendent and bioretention designer inspection and sign-off before proceeding. Comments (attach and refer to additional pages if necessary) NB: Photos attached. Signed by superintendent: Print name: Date: ACTION (IF UNSATISFACTORY) Signed by bioretention designer: Print name: Date: INITIAL
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FORM G — LANDSCAPE INSTALLATION Purpose: To ensure the correct plants are supplied, installed and established. ITEMS Correct mulch has been supplied Mulch applied to correct depth and secured Supplied plants are correct species Supplied plants are in correct pot sizes and maturity (300 mm min) Plants have been installed at correct planting density (min 6 plants/m?) As constructed drawings marked up with final plant species and densities CHECKED SATISFACTORY ACTION (IF UNSATISFACTORY) INITIAL Mulch is clear of plant stems by approximately 50 mm HOLD POINT: Superintendent AND bioretention designer inspection and sign-off before proceeding. Comments (attach and refer to additional pages if necessary) NB: As constructed drawings and photos attached Signed by superintendent: Print name: Date: Signed by bioretention designer: Print name: Date:
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FORM H — LANDSCAPE ESTABLISHMENT Purpose: To ensure the correct plants are supplied, installed and established. ITEMS CHECKED PLANT ESTABLISHMENT Weeds being removed as required | — —t—_ - - Watering occurring as required Replanting occurred as required to replace failed plants Plants successfully established plants propagation is occurring. Measure of successful establishment 1. Survivorship greater than 90% 2.80% coverage of system 3. Preferably more than one species per macrophyte zone 4. At least 5 plants/m2 (preferably 6-10 plants/m2) 5. Plant height of at least 50%. This can be measures through the use of marker or stakes through the bioretention 6. Propagation is occurring (more than 2-3 stems, seeding) 7.No weeds. Growth and maturity should be recorded through three-monthly photo logs every 500 m2. ACTION (IF BAST ACTORY. UNSATISFACTORY) HOLD POINT: Superintendent AND bioretention designer inspection and sign-off. Comments (attach and refer to additional pages if necessary) NB: As constructed drawings and photos attached. Signed by superintendent: Print name: Date: Signed by bioretention designer: Print name: Date: INITIAL
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4.3 Inspection and maintenance checklist for bioretention systems ASSET TYPE Bioretention ASSET ID Location Date Date of last rainfall Weather Officer's name Bioretention plan Insert diagram or plan of the asset showing key features e.g. locations of inlet, outlet, and overflow Additional information Time taken to complete inspection or maintenance Photos of site 1. (explanatory notes) General comments and sketches Officer's signature Maintaining Vegetated Stormwater Assets Vers on | waterbudesign 41
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Appendix 3
Bioretention Basin Maintenance Checklist
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BIORETENTION BASIN MAINTENANCE CHECKLIST
Inspection Frequency 1 to 6 Monthly Date of Inspection
Location
Description
Asset ID
Site Visit by
Inspection Items Y N Actions Required (Details)
Sediment accumulation at inflow points?
Litter within basin?
Erosion at inlet or other key structures?
Traffic damage present?
Evidence of waste dumping?
Vegetation condition satisfactory (health,
weeds etc)?
Watering of vegetation required?
Replanting required?
Mowing required?
Clogging of drainage points (sediment or
debris)?
Evidence of ponding?
Damage/Vandalism to structures present?
Surface clogging visible?
Filling of surface required?
Drainage System inspected?
Resetting of system required?
Excellence with Economy in Engineering 9
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