Balmoral Stormwater Pollution Control Project - Stage 2 · PDF fileBALMORAL STORMWATER POLLUTION CONTROL PROJECT ... WORK ... Excavation of 85 cubic meters of topsoil and 185 cubic

BALMORALSTORMWATER

POLLUTION CONTROLPROJECT —

STAGE 2

FINAL REPORT

THIS PROJECT HAS BEEN ASSISTED BY THE NSW GOVERNMENTTHROUGHITS STORMWATER TRUST

Draft Final Report: Balmoral Catchment Stormwater Management Project - Stage 2

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TABLE OF CONTENTS

1 PROJECT SUMMARY ..................................................................................................... 2

2 INTRODUCTION .............................................................................................................. 3

3 COUNCIL OFFICERS & CONTRACTORS INVOLVED ........................................... 4

4 DESCRIPTION OF THE PROJECT ............................................................................... 5

5 DIFFICULTIES AND/OR DELAYS ENCOUNTERED ................................................ 9

6 MODIFICATIONS TO DEAL WITH PROBLEMS OR TO IMPROVE OUTCOMEOF PROJECT ..................................................................................................................... 9

7 EVALUATION OF PROJECT COMPARED WITH PROPOSAL ........................... 10

8 EVALUATION OF PROJECT TIMETABLE.............................................................. 10

9 EVALUATION OF THE PROJECT ............................................................................. 12

10 FUTURE LONG-TERM IMPACTS STATEMENT AND ANY FOLLOW UPWORK ............................................................................................................................... 13

11 VISUAL DOCUMENTATION ....................................................................................... 14

12 PROMOTIONAL ACTIVITIES AND PUBLICITY.................................................... 29

13 COPIES OF MEDIA COVERAGE ................................................................................ 30

14 COPIES OF ALL PROMOTIONAL MATERIAL ...................................................... 33

15 RESULTS OF MONITORING THE PROJECT’S EFFECTIVENESS .................... 37


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1 PROJECT SUMMARY

This project is Stage 2 of the Balmoral Catchment Stormwater Management Project (BCSMP). TheBCSMP is a five-stage holistic catchment management approach to mitigate the effects of urbanstormwater pollution from the 157ha Balmoral Catchment, which drains into Hunters Bay, MiddleHarbour. The BCSMP incorporates a range of structural and non-structural measures to achieve itsobjectives.

The Stage 2 project involved the following four components (see Figure 3 to view the Stage 2 projectcomponents within the BCSMP context):

1. Installation of two Stormwater Quality Improvement Devices (SQIDs)2. Creek rehabilitation3. Erosion control4. Community education

1. Installation of two SQIDs

� Installation of HB4b beside the Esplanade opposite Mandalong RdThe first SQID installed was a Continuous Deflective Separation (CDS) P3024 device to treat51% or 25 hectares of the Balmoral Beach North Sub Catchment (see Figure 2 for zoningwithin the Balmoral Beach North Sub Catchment).

� Installation of HB3 beside the Esplanade opposite Raglan StreetThe second SQID installed was a prototype CDS F0912 fibreglass device to treat 100% or 4.5hectares of the Esther Road Catchment (see Figure 2 for zoning within the Esther RoadCatchment).

2. Creek rehabilitation and erosion control

Bank stabilisation and creek rehabilitation was undertaken in Balmoral Park Creek to reducestormwater-induced erosion. The bed slopes of the creek channels were reduced to minimise flowvelocity and energy to prevent further erosion. The creek and banks were stabilised using acombination of rock armouring and locally indigenous vegetation.

A small weed eradication program in bushland adjacent to the creek rehabilitation works of BalmoralPark Creek was undertaken.

3. Erosion control in bushland areas

Upstream of the main creek rehabilitation site, scour protection work was undertaken (using locallysourced sandstone) to prevent stormwater-induced soil erosion in a bushland area managed by bushcarevolunteers. In addition, stormwater currently discharging through the bushland was redirected througha pipe directly into the creek.

At Wyargine Point, in the north of the project site, a stormwater channel was widened and deepened toredirect stormwater currently flowing through a bushland area.

4. Community education

A community education program was undertaken to inform residents and visitors about stormwaterpollution, the details of the project, progress and the results. This was started prior to the projectcommencing and will run for the duration of the project.


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2 INTRODUCTION

2.1 BACKGROUND

The Balmoral area is significant both to locals and the large number of visitors attracted to MosmanSee Figure 1 to view the Mosman municipality in a regional context and Figure 3 to view an aerialphotograph of the Balmoral area. Balmoral Beach and Hunters Bay form a recreational area used for avariety of contact water sports, picnics and scenic walks. Balmoral’s popularity is expected to riseduring the 2000 Olympics due to the area’s close proximity to Olympic sailing events taking place onSydney Harbour. Balmoral also has historic significance due to associations with early Europeansettlement and the presence of Aboriginal heritage sites.

The Mosman Heritage Review (Godden Mackay 1996) notes that Balmoral Beach is “the finest andmost extensive beach in Sydney, and has State significance due to its historic, social, aesthetic andtopographic significance”.

� Historic – due to associations with early settlement and with improvements instituted duringthe Great Depression (e.g. the Promenade and the Rotunda) and the presence of Aboriginalheritage sites;

� Social – due to its importance as a recreational area for a wide range of activities;� Aesthetic – due to a combination of natural features and human elements;� Topographic – due to the expansive, curvilinear and enclosed nature of the beach.� The periphery and slopes of Balmoral Park and Wyargine Point are remnant bushland areas of

Tall Open Forest/Woodland Hawkesbury sandstone communities. They form both wildlifehabitat and a corridor for flora and fauna, particularly due to their close proximity to SydneyHarbour National Park. Such areas are an important representation of the native bushlandfound in the area prior to urban developments

Building on previous work undertaken in the Mosman Bay area, the Balmoral Catchment StormwaterManagement Project (BCSMP) aims to significantly reduce pollution and sediments in stormwaterdischarged into Hunters Bay, Middle Harbour, through a combination of stormwater treatmentmeasures and community awareness raising. It is hoped that these actions will in turn reduceecological impacts including the death of marine organisms such as seagrass beds and kelp.

The foreshores and rocky platforms of Hunters Bay provide habitat for a range of marine and intertidalspecies including seadragons, bartailed goatfish, and anchovies. Large portions of the litter carried instormwater are plastics and cigarette butts, which are major causes of mortality in marine creatures.Sediment carried by stormwater can smother sessile organisms. Since litter travels great distances ontides, reducing litter loads will reduce impacts on both local and regional marine life.

2.2 OBJECTIVES

The objectives of the project were to:

� Reduce the total load of pollutants in stormwater discharged to Hunters Bay; therebyimproving water quality, recreational amenity, aesthetic value, and reducing adverseecological impacts.

� Reduce stormwater-induced soil erosion in key bushland areas.

� Restore Balmoral Park Creek and enhance its habitat value.

� To educate and raise community awareness of stormwater pollution issues.


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3 COUNCIL OFFICERS & CONTRACTORS INVOLVED

3.1 Mosman Council Project Team

� Project Management: Warren Rowlands, Manager Environment & ServicesPaul Davis, Senior Design Engineer

� Project Engineers: Edwin Ho, Project EngineerFrank Panetta, Project Engineer

� Environment Officers: Kane Glanville, Senior Environment OfficerRebecca Craze, Environmental Project OfficerJulia Porter, Environment Officer

� Technical Review: Scott Turner, Manager Assets & Services

3.2 Contractors

3.2.1 HB4b Site (Beside the Esplanade opposite Mandalong Road)

� CDS Pty Ltd: Supply and Installation of CDS P3024

3.2.2 HB3 Site (Beside the Esplanade opposite Raglan Street)

� CDS Pty Ltd: Supply and Installation of CDS F0912

3.2.3 HB1 Site (Balmoral Park Creek)

� Gannon Consulting: Survey of creek and bushland� Australian Museum Business Services Ecological survey� HLA Envirosciences Initial site contamination investigation� GM Laboratories Analysis of soil samples from excavated spoil� Landscape 2000: Civil and Landscaping works

3.2.4 Erosion control in bushland areas

� Trackline Civil Pty Ltd: Stormwater diversion and scour protection works

3.2.5 Community education

� Taverner Research Company Mosman stormwater knowledge benchmarkingsurvey.Mosman stormwater knowledge post survey.

� Zion Graphics Design and printing of “Mosman FoodBusiness- Environmental Management Booklet.

� Municipal Contracting Drain labellingConstruction and installation of public displayboard (Balmoral Beach) and project signs

� Public Art Squad Embellishment of CDS lids (HB4b Site) withpublic art.


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4 DESCRIPTION OF THE PROJECT

4.1 PROJECT METHODOLOGY

All contractors working on the project were engaged under State Government Contract (SGC) 019 or inaccordance with Mosman Council’s Contract Management Tendering Policy.


A CDS P3024 was installed under the footpath adjacent to The Esplanade, opposite Mandalong Road.The device’s location was chosen to enable efficient and accessible maintenance. The CDS 3024 isone of the larger CDS devices available with a 3m-diameter screen and 11.3m3 pollutant holdingcapacity. The device effectively treats gross pollutants (material greater than 5mm), a large proportionof sediments, and some oils and greases, and serves a 25 hectare portion of the Balmoral Beach NorthSub Catchment. It was the first of three SQIDs planned to treat 100% of the 48-hectare BalmoralBeach North Sub Catchment.

The two additional SQIDs that were originally planned to be installed as part of this project did notattract funding and have subsequently been installed as part of a Coasts and Clean Seas Project.

Council commissioned CDS Pty Ltd on 23 August 1999, to undertake the design, supply, andinstallation of the device. CDS Pty Ltd were also required to submit site management plans(Environmental Management Plan, Traffic Management Plan) to the satisfaction of Council. Councilproject staff played an active role in the supervision of construction and adherence to the sitemanagement plans. CDS Pty Ltd took possession of the site in early September 1999 and completedthe installation of the device by the end of October 1999, which involved the following:

� Excavation of 85 cubic meters of topsoil and 185 cubic meters of rock to a depth of over 7metres

� Installation of pre-cast sump and diversion chamber� Installation of screen� Connection to the stormwater main� Backfilling to surface level� Restoration of roads and footpaths


A CDS F0912 was installed in the footpath beside The Esplanade, opposite Raglan Street. Thedevice’s location was chosen to enable efficient and accessible maintenance. The CDS F0912 is asmall (1m diameter, 0.5m3 pollutant holding capacity) prototype fibreglass unit, ideal to treat 100% ofthe relatively small 4.5 hectare Esther Road Sub-Catchment. The device was chosen to effectively treatgross pollutants (material larger than 5mm), a large proportion of sediments, and some oils and greases.The device was also capable of handling the tidal effects subjected to the catchment.

Council commissioned CDS Pty Ltd on 28 March 2000, to undertake the design, supply, andinstallation of the device. CDS Pty Ltd were also required to submit site management plans(Environmental Management Plan, Traffic Management Plan) to the satisfaction of Council. Councilproject staff played an active role in the supervision of construction and adherence to the sitemanagement plans. CDS Pty Ltd took possession of the site in late June 2000 and completed theinstallation of the device in mid July 2000 which involved the following:

� Excavation of 30 cubic meters of topsoil and 3 cubic meters of rock to a depth of over 4metres

� Installation of fibreglass sump and diversion chamber� Installation of screen


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� Connection to the stormwater main� Backfilling to surface level� Restoration of footpaths, turf, and garden beds


Balmoral Park Creek underwent rehabilitation works to reduce stormwater-induced erosion andsedimentation of Hunters Bay. The creek is positioned at the southern end of Balmoral Park, upstreamof an existing SQID (3m diameter CDS device installed as part of Stage 1 of the BSMP) before itoutlets on the southern end of Balmoral Beach.

The design process for this site involved:� Survey of creek and bushland� Services Search� Ecological Survey� Engineering design of the creek rehabilitation works by Council engineers� Planting scheme of the creek by Council landscape designers

Preliminary works at the site involved a site contamination investigation due to concerns regarding thehistory of the site; in particular the possible existence of soil contamination as a result of previouslandfilling practices, which occurred at Balmoral Park.

An HLA environmental engineer attended the site on 2 March 2000. Soil samples were collected fromtwo hand auger boreholes and from a test pit. Sample locations were situated in and adjacent toBalmoral Creek. Soil profile logs were recorded for each location.

A total of 3 soil samples were analysed for total petroleum hydrocarbons (TPH), benzene, toluene,ethyl benzene, xylenes (BTEX), polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides(OCPs), polychlorinated biphenyl’s (PCBs) and heavy metals (arsenic, cadmium, chromium, copper,lead, mercury, nickel and zinc). All samples were analysed at Australian Laboratory Services; a NATAcertified laboratory.

Laboratory results were compared to relevant NSW EPA guidelines. These results are summarisedbelow:

� Concentrations of TPH were reported at less than sensitive landuse guidelines in allsamples analysed.

� Concentrations of BTEX were reported at less than laboratory practical quantitation limits(PQL) in all samples analysed.

� Concentrations of total PAHs exceeded guidelines for residential landuse with gardensand accessible soil in one sample.

� Concentrations of benzo(a)pyrene exceeded guidelines for residential landuse withgardens and accessible soil in all three samples analysed.

� Concentrations of OCPs were reported at less than guidelines for residential landuse withgardens and accessible soil in all samples analysed.

� Concentrations of PCBs were reported at less than laboratory practical quantitation limits(PQL) in all samples analysed.

� Concentrations of heavy metals were reported at less than guidelines for residentiallanduse with gardens and accessible soil in all samples analysed.

� Concentrations of zinc in all three samples exceeded phytotoxicity guidelines.


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HLA recommended that excavated material be stockpiled on site, sampled and characterised inaccordance with EPA guidelines: Assessment, Classification and Management of Liquid and Non-Liquid Wastes prior to the removal from the site. Subsequently, spoil that was excavated from the sitewas sampled and analysed and found to comply with all relevant guidelines.

The creek rehabilitation works were undertaken under two separate contracts, civil and landscaping.Landscape 2000 was commissioned on 11 February 2000, to undertake the civil works and alsocommissioned on 24 March 2000, to undertake the landscaping works. Landscape 2000 tookpossession of the site in late March 2000 and completed both the civil and landscaping works by theend of April 2000 which involved the following:

� Removal of weeds and noxious plants, both within the creek and adjacent bushland areas� Reconstruction of existing headwall and weir� Widening and re-alignment of the creek channel, and reduction of the bed slope, by

excavating a total of 175m3 of soil (all of which was reused on site for stabilisation of banksand landscaping)

� Installation of sandstone weirs and drop structures� Stabilisation of the creek and banks using a combination of rock armouring and plantings of

locally indigenous vegetation� Formation of a planting mound adjacent to the creek from soil used from excavations, thus

avoiding substantial amounts of tipping, and providing extra capacity to the creek and anattractive landscaping feature

Once all engineering works were completed Council bush care volunteers weeded and planted certainareas. Council has also engaged a contractor to carry out long-term maintenance of the creek.

4.1.4 Erosion control in bushland areas

Upstream of the main creek rehabilitation site, scour protection work was undertaken (using locallysourced sandstone) to prevent stormwater-induced soil erosion in a bushland area managed by bushcarevolunteers. In addition, stormwater currently discharging through the bushland was redirected througha pipe directly into the creek.

At Wyargine Point, in the north of the project site, a stormwater channel was widened and deepened toredirect stormwater currently flowing through a bushland area.


A community education program was undertaken throughout the project to inform residents andvisitors about stormwater pollution and the details of the projects including, progress and results are asfollows:

� An education booklet for retail food businesses was produced and distributed to localfood businesses. The Food Businesses Environmental Management Booklet containedpractical information on minimising stormwater pollution and useful industry contacts.

� A permanent, continually updated information display at Hunters Park (Balmoral Beach)including information on stormwater pollution issues, the objectives and details of theproject and its progress and, upon completion, data on the pollution trapped.

� Pages on Council’s website dedicated to the project including the type of informationused in the display.

� Mosman Municipal Council commissioned a two-stage survey to monitor the success oftheir community education program regarding stormwater pollution issues. Prior tocommencing the community education program, a benchmarking survey was conducted


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in August 1999. A post program survey was conducted in August 2000. Each stage ofthe study of had a sample of approximately:

� 250 Mosman residents

� 150 Balmoral residents

� 40 Balmoral area retail food outlet owners or managers.

In addition, 50 Mosman area retail food outlet owners or managers where interviewed forthe Stage 2 survey.

� A drain-labelling program was undertaken within the Balmoral catchment area. Lintelson street stormwater drains were labelled with the slogan “This drains to BalmoralBeach” in blue print on a white background. Approximately half of all stormwater drainswere labelled within the catchment, a total of 124 drains.

� Mosman Council undertook a media campaign utilising local newspapers. This campaignconsisted of press releases highlighting the installation of the water quality improvementdevices, advertisements addressing the effects of littering, illegal disposal of garden wasteand uncollected dog faeces on Balmoral’s stormwater quality. Notifications of structuralworks were also included in the Council column.

� An official launch promoting the Food Business Stormwater Education & Awarenesscampaign was held on 20 October 1999. Guest speakers included the Mayor of Mosman,Councilor Patricia Harvey, and Chairman of Clean Up Australia, Ian Kiernan. Local foodbusiness proprietors and members of the general community also attended the launch.Promotional material was also distributed at the launch.

� A stormwater education presentation was held for local school children that attended theafter school care program located at Mosman Cultural Centre. The presentation coincidedwith Water Week organised by the Department of Land & Water Conservation heldbetween 17 and 23 October 1999. After the presentation the participants were asked tosubmit artwork to the Council relating to the topic of stormwater. The artwork wassubsequently exhibited as a temporary display exhibited at Bridgepoint Shopping Centre.

� Temporary displays were constructed and exhibited at various locations within the localgovernment area (e.g. Civic Centre, local library). Each display contained relevantinformation pertaining to local water quality, stormwater pollution issues and practicalsolutions preventing pollution. Information relating specifically to the BalmoralStormwater Management Project was also included.

� Artwork embellishing the cover of the stormwater quality improvement device located atThe Esplanade, Balmoral Beach (HB4b Site) was commissioned by Mosman Council.The artwork, a mosaic, was constructed by The Public Art Squad from ceramic tiles. Theartwork had a water/marine theme.

� A series of stormwater awareness fact sheets are being developed. The fact sheets focuson a number of issues including, stormwater quality and the effects of poor water quality,stormwater pollution prevention, and water cycle analysis. The fact sheets will be kept inthe library for reference material and as part of the local studies collection.

� An environmental auditing program, which targeted local food retail businesses, wasconducted. The purpose of the audit was to assess how local food businesses wereperforming in the area of environmental management, in particular stormwatermanagement, and secondly as an educational awareness campaign in relation tostormwater management issues. Results of the food premises audit were used in thedevelopment of the Food Business Environmental Management Booklet.

� Bus tours, for residents and Councilors were conducted of all the stormwater qualityimprovement devices in the Balmoral Catchment area.


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5 DIFFICULTIES AND/OR DELAYS ENCOUNTEREDCouncil experienced the following difficulties and delays during management of the project;

� Delays in the appointment of project officers� Delays in selecting a device for the Esther Road Sub Catchment (HB3), due to site constraints

including; tidal influences within the stormwater system and stormwater pits not having sufficientdepth to allow implementation of the original proposal.

� Delays in the printing of the Food Businesses Booklet.� Delays in the development of the stormwater fact sheets.

6 MODIFICATIONS TO DEAL WITH PROBLEMS OR TOIMPROVE OUTCOME OF PROJECT

6.1 HB3 Modification from five in pit devices to a single “end-of-pipe”device for the Esther Road Sub-Catchment

It was initially proposed to install five in pit devices for the Esther Road Sub-Catchment (HB3).However in pit devices were discounted for the following reasons:

� Some existing stormwater pits were too shallow to incorporate an in pit device� In pit devices do not capture sediments and smaller particles� A single device would be cheaper to maintain due to a lower frequency of clean outs being

required.� General concern over the efficiency of in pit devices.

As this issue had not been addressed by the due date of the Scoping Report it was agreed with the EPAthat, Council’s Scoping Report would be approved except for the treatment of the Esther Road Sub-Catchment, and that Council would explore options to install a single “end-of-pipe” device.

Council then requested Rocla, Ecosol, and CDS to provide proposals and quotes for the installation of asuitable device. Following an evaluation of these proposals a CDS F0912 at a cost of approximately$35,000 was found to best meet the requirements.

The initial estimate for the installation of the in pit devices was $12,000 Council subsequently reviewedthe project budget. Savings were made in various areas allowing the device to be installed.

Council subsequently sought approval in a letter to the EPA dated 6 March 2000, to vary the projectfrom installing five in pit devices to installing a single CDS device to treat the Esther Road Sub-Catchment. Council received approval from the EPA for this variation in a letter to Council dated 13March 2000.

6.2 Embellishment of HB4b access lids with public art

The installation of the CDS device required four ‘Gatic’ style access lids for maintenance andmonitoring. These lids were positioned in the footpath beside The Esplanade for efficient access. Inconsideration of the visual amenity and in keeping with the requirements of the Balmoral ReservesPlan of Management for high quality finishes, an opportunity existed to embellish the lids with publicart. The embellishment of the lids was considered to be important to create community awareness andcontributed to the education campaign. This variation was included in the Scoping Report submitted tothe EPA.


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7 EVALUATION OF PROJECT COMPARED WITH PROPOSALCouncil’s original grant application was for an amount of $851,925. The proposals structuralcomponents included the installation of SQIDs to treat stormwater from the following sub-catchmentsof the Balmoral area; Esther Road, Balmoral Beach South and all of Balmoral Beach North. This wouldhave resulted in treatment of 81% of the Balmoral Catchment. Completion for these works was the endof August 2000.

Council’s application was approved subject to the following conditions:

� Stormwater Trust funding was limited $270,000, which allowed the treatment of only aportion of the Balmoral Beach North sub-Catchment and the Esther Road Sub-Catchment, the community education program, and the creek rehabilitation and erosioncontrol of Balmoral Park Creek.

� Completion date being brought forward to 17 December 1999

The project achieved all tasks, milestones, and objectives that were agreed upon in the approvedscoping report.

The project was completed by the completion date as applied for in the grant, however it was notcompleted by the agreed completion date as set out in the Scoping Report.

The project was completed with a $10,095.50 or 2.3 % deficit which has been funded by MosmanCouncil(see Financial Report).

8 EVALUATION OF PROJECT TIMETABLEMosman Municipal Council set out a project timetable for this project as follows in its application forthe grant (baseline is shaded grey and actual is denoted by black line):Description of projectelement

Jul99

Aug Sep Oct Nov Dec Jan00

Feb Mar Apr May Jun Jul Aug Sep

Project commenced

Relocation of services*

Design - filtration devices

Construction of devices

Design – erosion control/creekrehabilitation

Tender process for creek andbushland works

Erosion control/creekrehabilitation

Information to residents

Retail food education program

Information/education display(permanent)

Project commissioning

Table 1 Project Timetable (December 1998, Application for Stormwater Trust Stage 2Stormwater Project Grant Scheme, pg. 9)


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9 EVALUATION OF THE PROJECT

9.1 Balmoral Beach North Sub-Catchment SQID

The Balmoral Beach North Sub Catchment SQID (CDS P3024 ) was installed and commissioned bythe end of October 1999 and has operated as designed. On 3 February 1999 the device was cleaned outfor the first time and in just over 3 months from the date of commissioning 4.5 tonnes of grosspollutants, debris and sediment was removed). Another two cleanouts have been performed to date,removing a total of 10.1 tonnes of pollutants from this device that would have otherwise ended up inreceiving waters and in particular Hunters Bay, Middle Harbour (see photographs 1-4).

9.2 Esther Road Sub-Catchment

The Esther Road SQID (CDS F0912) was installed and commissioned by the end of July 2000. Nocleanouts have been performed to date, however it has been inspected on 20 August 2000, and wasfound to be operating well and 88% full with pollutants. It is anticipated that this device will requirecleaning out within the next two months, indicating that the device is performing as designed. (seephotographs 5-7).

9.3 Creek Rehabilitation and Erosion Control of Balmoral Park Creek

The rehabilitation works at Balmoral Park Creek was completed by the end of April 2000.Maintenance data for the CDS device located downstream of the these works show that there was noincrease in capture of sediment during the creek rehabilitation period.

The creek rehabilitation works have been a complete success in achieving all of its objectives. Visualassessment of the creek during high flow periods show that the aim of flow velocity to sub criticallevels has been successful. This reduction along with the rock armouring, weir construction and re-establishment of endemic riparian vegetation has minimised rates of sedimentation and erosion of thebed and banks.

Weed invasion from adjacent areas and residual seed within the soil has been a problem. A high levelof maintenance has been required to combat this especially in areas where mulch was not used such asthe creek bed and banks. To combat this Council engaged Contractors to clear weeds in adjacentbushland areas to prevent weed invasion of the creek. (see photographs 8-16)

Erosion control in bushland areas

9.4 Community education

In general, the education campaign appears to have had a greater effect on Mosman residents than onretail food outlets. There were some significant shifts in the level of knowledge and concern aboutstormwater issues among residents. However there was little difference in the results of the surveys ofretail food outlets. It should be noted that even though some percentage shifts in the retail food outletsurvey were quite large, they are not generally statistically significant due the small number of businessin the sample (see photographs 17-22).


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10 FUTURE LONG-TERM IMPACTS STATEMENT AND ANYFOLLOW UP WORK

Stage 2 of the Balmoral Catchment Stormwater Project will see many long-term environmentalbenefits being:

� The reduction of the total load of pollutants in stormwater discharged into HuntersBay; improving water quality, recreational amenity, aesthetic value, and reducingadverse ecological effects.

� The reduction of soil erosion in bushland areas.

� The restoration of Balmoral Park Creek leading to reduced erosion and theenhancement of its ecological value.

� The raising of community awareness of stormwater pollution issues.

10.1 Routine Monitoring of Balmoral Beach North and Esther RoadSQIDs

Regular visual inspections of both SQIDs will be performed to ensure emptying and cleaning isundertaken at an optimum frequency.

All material removed will be weighed and characterised into different types of pollutants. Records willbe collated, documented and made publicly available via a number of media including Council’s Stateof the Environment Report, permanent display and internet facilities.


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11 VISUAL DOCUMENTATION

11.1 MAPS

�

Sydney

Harbo

ur

Oce

an

0

Paci

fic

1.5

Kilometres

3

MosmanNorth

Sydney

Canterbury

Marrickville

Concord Drummoyne

Leichhardt

Warringah

Randwick

SouthSydney

Ku-ring-gai

Waverley

Woollahra

HuntersHill

LaneCove

Willoughby

Sydney

Manly

AshfieldBurwood

Ryde

Figure 1 Mosman municipality in a regional context

Figure 2 Zoning within the Balmoral Beach North Sub Catchment (HB4b) and the Esther RoadCatchments (HB3)


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Figure 3 Balmoral Catchment Stormwater Management Project


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11.2 PHOTOGRAPHS


� Photograph 1 HB4b 7SEP2000 start of construction

� Photograph 2 HB4b 16SEP2000


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� Photograph 3 HB4b 21SEP2000

� Photograph 4 HB4b at completion and lids embellished with public art


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� Figure 4 HB4b 3FEB2000 CDS P3024 during first clean out

Figure 5 HB4b 3FEB2000 CDS P3024 during first clean out. Pictured on-lookers are twoprominent locals Dr John Yu and Professor Bruce Thom (also present were membersof Council staff, Mosman Daily, CDS, and local residents).


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� Photograph 5 HB3 26JUN2000 start of construction

� Photograph 6 HB3 27JUN2000


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� Photograph 7 HB3 19JUL2000 works completed


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� Photograph 8 HB1 creek running prior to rehabilitation (at headwall, eastern end)

� Photograph 9 HB1 creek running prior to rehabilitation (facing upstream at midway)


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� Photograph 10 HB1 creek dry prior to rehabilitation (facing upstream at midway)

� Photograph 11 HB1 creek dry prior to rehabilitation (facing upstream at midway)


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� Photograph 12 HB1 creek dry prior to rehabilitation (facing upstream at western end)

� Photograph 13 HB1 31MAR2000 creek during construction (facing downstream at midway)


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� Photograph 14 HB1 4APR2000 creek during construction (facing upstream at midway)

� Photograph 15 HB1 20APR2000 creek nearing completion (facing downstream at midway)


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� Photograph 16 HB1 5MAY2000 creek after rehabilitation and running (facing downstream atmidway)


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� Photograph 17 Official launch of the Food business Stormwater Education Program

� Photograph 18 Example of drain labeling, which occurred within the Balmoral Catchment area


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� Photograph 19 Stormwater presentation to the participants of the After School Care Programheld at Mosman's Cultural Community Centre during "Water Week" inOctober 1999.

� Photograph 20 Stormwater presentation to the participants of the After School Care Programheld at Mosman's Cultural Community Centre during "Water Week" inOctober 1999.


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� Photograph 21 Public display at Bridgepoint Shopping Centre Mosman, part of the stormwaterEducation Campaign undertaken in Stage 2 of the Balmoral StormwaterManagement Program

� Photograph 22 Children’s artwork from the After School Care Stormwater EducationProgram exhibited at Bridgepoint Shopping Centre Mosman


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12 PROMOTIONAL ACTIVITIES AND PUBLICITY

12.1 Publicity� Article Mosman Daily 26 August 1999� Article Mosman Daily 28 October 1999� Article Mosman Daily 1 June 1999� Article Mosman Daily 10 February 1999

See section 13 for copies of all media coverage that Council is aware of.

12.2 Promotional Activities� Advertisement Mosman Daily 28 October 1999� Advertisement Mosman Daily 4 November 2000� Advertisement Mosman Daily 11 November 2000� Advertisement Mosman Daily 18 November 2000� Advertisement Mosman Daily 21 October 2000� Advertisement Mosman Daily 18 May 2000 and every Thursday thereafter until 20 July

2000

See section 14 for copies of promotional material.


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13 COPIES OF MEDIA COVERAGE

� Figure 6 Mosman Daily article 26AUG1999

� Figure 7 Mosman Daily article 28OCT1999


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� Figure 8 Mosman Daily article 1JUN2000


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� Figure 9 Mosman Daily article 10FEB2000


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14 COPIES OF ALL PROMOTIONAL MATERIAL

� Figure 10 Mosman Daily advertisement 28OCT1999

� Figure 11 Mosman Daily advertisement 4NOV2000

� Figure 12 Mosman Daily advertisement 11NOV2000


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Figure 13 Mosman Daily advertisement 18NOV2000

� Figure 14 Mosman Daily advertisement 21OCT2000

� Figure 15 Mosman Daily advertisement 18MAY2000 and every Thursday thereafter until20JUL2000


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14.1 PROJECT SIGNAGE

Stage 2 of this project is being jointly funded by Mosman Council and the New South Wales State Government through the EPA’s Stormwater Trust.

This device will lead to a cleanerbeach and less pollution andsedimentation of Hunters Bay andMiddle Harbour. It is designed with amaximum treatable flow rate of?????? Litres / second, and can holdbetween ??? And ??? Tonnes ofpollutants before requiring cleaning.

As part of Stage 2 of the BalmoralPollution Control Project, MosmanCouncil is installing this innovativecontinuous deflective separation (CDS)stormwater pollution filtration device atthis site.

The device will trap a range ofpollutants including up to 95% of allgross pollutants such as plastic bags,bottles, cigarette buttsand vegetative matter. It will alsocapture sediments and some oil, greaseand nutrients.

The work is being carried out byCDS Technologies Pty Ltd who holdthe rights to the design of thedevice. The work is expected to becompleted and the device fullyoperational by mid October thisyear. If you have any questionsregarding the installation of thisdevice please call Council’s SeniorDesign Engineer Paul Davis on99784023

Photograph showing the insideof a CDS unit prior to cleaning

Schematic of a CDS device

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Rocky Point

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Stage 3- Instal 2 stormwaterfiltration devices

Stage 2- Instal 5 in pit devices

Stage 4 - Instal stormwaterfiltration device

Creek

Stage 2- Creek rehabilitationerosion control and bushregeneration work

Stage 1- Existing CDSStormwaterfiltration device

Stage 2- Instal filtration device

CDS POLLUTION FILTRATION DEVICE FOR BALMORALBEACH

Stage 4 (Currently unfunded)Installation of a stormwater pollution filtration device adjacent toBotanic Road to treat stormwater from the Balmoral Beach Southsubcatchment.

PROJECT OVERVIEW

Stage 3 (Grant application to the Federal Governments National HeritageTrust pending)Installation of stormwater pollution filtration devices on the two remaininguntreated pipes draining the Balmoral Beach North subcatchment.

The Balmoral stormwater pollution project is a Mosman Council initiative,and aims to improve water quality in Hunters Bay and Middle Harbour,reduce sedimentation in Hunters Bay and Middle Harbour, restoreBalmoral Park Creek and enhance its habitat value, and to educate andraise community awareness of stormwater pollution issues.

These broad aims are to be achieved by:� Installation of stormwater pollution filtration devices.� Installation of in pit gross pollutant traps.� Creek rehabilitation, erosion control works and bush regeneration

works in the vicinity of Balmoral Park.� Comprehensive education program.

Stage 1 (complete)Installation of a Continuous Deflective Separation (CDS) stormwaterpollution filtration device on the outlet of the Balmoral Park subcatchment.This was commissioned on November 1995.

Stage 2 (jointly funded by Mosman Council and the NSW StateGovernments Stormwater Trust, with a total cost of $420,000)

� Installation of a CDS stormwater pollution filtration device on one ofthe 3 pipes draining to the outlet of the Balmoral Beach Northsubcatchment.

� Creek rehabilitation works to the Balmoral Park creek includingregrading, bank stabilisation and revegetation.

� Erosion control and bush regeneration works to bushland within theBalmoral Park subcatchment.

� Installation of 5 in pit stormwater filtration devices on The Esplanadenear the Raglan Street intersection.

� Comprehensive education campaign.

Balmoral Stormwater Pollution Control Project

Figure 16 HB4b and HB3 site project sign


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14.2 Food booklet

� Figure 17 Food booklet cover


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15 RESULTS OF MONITORING THE PROJECT’SEFFECTIVENESS

15.1 HB4b Site (Beside the Esplanade opposite Mandalong Road)

Cost of Collection

Cost of Cartage & Disposal

Composition

% Silt % litter % organic

3-Feb-00 4.5 1,198$ 900$ 298$ 10% 10% 80% first clean out

11-May-00 4.3 1,094$ 900$ 194$ 10% 10% 80%

15-Jun-00 1.25 956$ 900$ 56$ 5% 5% 90%

Total/average 10.05 3,248$ 2,700$ 548$ 8% 8% 83% to date

Date Tonnes Removed Total Cost Remarks

Table 2 Stormwater pollution control data for HB4b

The HB4b SQID was monitored on 20 August 2000 and was found to be 53% full.

15.2 HB3 Site (Beside the Esplanade opposite Raglan Street)

The HB3 SQID has had not clean outs to date. However, the SQID was monitored as part of routinemonitoring on 20 August 2000, and was found to be 88% full. This indicates that the SQID willrequire a clean out soon and careful monitoring until the capacity of the pollutant sump is reached.

15.3 Results of the monitoring of the Stormwater Education campaign.

In summary, the residential survey results of the residential surveys show that:

� The level of concern regarding stormwater pollution among Mosman residents has risensignificantly over the course of the education and prevention campaign. In Stage 1, 74%of residents said they were concerned ‘a great deal’ or ‘a fair amount’ about stormwaterpollution increasing to 82% in Stage 2. Significantly fewer residents said they were ‘notat all concerned’ about stormwater pollution (11% in Stage 1 and 4% in Stage 2) andsignificantly more residents said they were concerned about stormwater pollution ‘a fairamount’ (26% in Stage 1 compared to 37% in Stage 2).

� The education campaign appears to have increased the basic knowledge of Mosmanresidents regarding stormwater. Most residents could give a general definition ofstormwater in both Stage 1 (91%) and Stage 2 (94%). However the percentage of ‘don’tknow’ responses significantly decreased when residents were asked in Stage 2 wherestormwater goes (decreasing from 19% in Stage 1 to 11 % in Stage 2) and if stormwaterwas treated the same or differently than sewage (decreasing from 18% in Stage 1 to 9% inStage 2.

� When asked what day-to-day activities contribute to stormwater pollution in Stage 2 halfof residents mentioned litter. Significantly more residents mentioned detergent from carwashing and pouring things such as oil, detergent, soil or chemicals down stormwaterdrains as contributing to stormwater pollution in Stage 2 than did so in Stage 1.

� Significantly more residents said that foreign items entering the stormwater drains had ahigh contribution to stormwater pollution in Stage 2 than did so in Stage 1, including:

- Pouring things such as oil, milk, detergent, soil & chemicals into stormwaterdrains

- Dropping cigarette butts- Hosing driveways and footpaths- Hosing areas around businesses- Dumping garden waste in bushlands.


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� After the education program residents were more likely to associate stormwater pollutionwith pollution of the waterways. Significantly more residents said that stormwaterpollution impacts the environment by polluting the harbour or ocean and polluting creeksor bushland in Stage 2 compared to Stage 1. However fewer residents tended to mentionthe specific visual and health impacts of stormwater pollution in Stage 2 compared toStage 1.

� In Stage 2, nearly 9 in 10 people felt allowing detergent, chemicals or paint into astormwater drain, littering, not cleaning up dog droppings and dropping cigarette buttsshould each be punishable be law with a significant increase in the percentage of residentssaying that not cleaning up dog droppings and dropping cigarette butts should bepunishable be law in Stage 2 compared to Stage 1.

� Significantly fewer residents said that Mosman Council was responsible for stormwatermanagement in Stage 2 (55%) than did so in Stage 1 (62%) with more residents sayingSydney Water and the EPA were responsible for stormwater management, reflecting thehigher profile of these organisations and television media campaigns.

In summary, the retail food outlet survey results show that:

� The level of concern about stormwater pollution among retail food outlets was relativelyhigh compared to other environmental issues. The main issues that retail food outlets inStage 2, were most concerned were littering, sewage overflow, development of bushlandand stormwater pollution. However a significantly higher percentage said they were ‘notat all’ concerned about stormwater pollution in Stage 2 (20% overall) compared to Stage1 (3%).

� Food outlets were slightly less likely than residents to be able to accurately definestormwater in both stages of the survey, with approximately the same percentage (73% to85%) of retail food outlets correctly defining stormwater in both stages of the study.

� 3 in 4 retail food outlets knew that stormwater is treated differently than sewage in bothstages of the survey.

� Retail food outlets were less likely than residents to know where stormwater in their areagoes. In Stage 2, 11% of residents did not know were stormwater goes compared to 38%for Balmoral and Mosman food outlets.

� In terms of the day-to-day activities that contribute to stormwater pollution, the majority(3 in 5) of retail food outlets said that litter contributed to stormwater pollution. The othermain activities mentioned were detergent from car washing and oil or grease fromvehicles on the road.

� Retail food outlets were somewhat more likely to say that each of the various activitieshave a ‘high contribution’ to stormwater pollution in Stage 2 compared to Stage 1. Inparticular, they felt that dropping cigarette butts, pouring things into stormwater drains,dropping litter and oil, grease or chemicals from vehicles on the road have a highcontribution to stormwater pollution in the Mosman area.

� Half of Mosman retail food outlets (48%) in Stage 2 did not know of any impact ofstormwater pollution. The retail food outlets were most likely to be aware thatstormwater affects the harbour or ocean with 43% of all retail food outlets in Stage 2saying the impact of stormwater pollution is that it pollutes the harbour or ocean.

� Retail food outlets were somewhat more likely to say that polluting activities should bepunishable by law in Stage 2 compared to Stage 1. In particular the percentage ofBalmoral retail food outlets saying dropping cigarette butts should be punishable by lawincreased from 70% in Stage 1 to 95% in Stage 2.


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� In Stage 2, 45% of Balmoral and 53% of Mosman retail food outlets knew that theCouncil was responsible for stormwater management compared to 40% in Stage 1.

In terms of the stormwater pollution reduction campaign:

� Significantly more residents were aware of Mosman Council’s activities to reducestormwater pollution in Stage 2 (57%) compared to Stage 1 (34%). However the level ofawareness was unchanged among retail food outlets.

� The main activities that residents were aware of were the Balmoral Beach filtrationdevice, drain labelling and the education campaign. Retail food outlets were most likelyto be aware of the Balmoral Beach filtration device and the education campaign.

� Overall 47% of residents, including 60% of Balmoral residents, recalled advertisementsor information about preventing stormwater pollution, as did 40% of retail food outlets.

Of the people that recalled seeing advertising, 50% of retail food outlets and 32% of residentsmentioned newspaper advertisements, including Mosman Daily advertising. Television commercialswere recalled by one-third of residents (31%) and one-fifth (22%) of retail food outlets who recallseeing advertising about preventing stormwater pollution. Retail food outlets were more likely thanresidents to recall seeing Council flyers and newsletter.

Documents

Balmoral Stormwater Pollution Control Project - Stage 2 · PDF fileBALMORAL STORMWATER POLLUTION CONTROL PROJECT ... WORK ... Excavation of 85 cubic meters of topsoil and 185 cubic