greater bunbury region scheme amendment no. … · corporation greater bunbury region scheme...

CORPORATION

GREATER BUNBURY REGION SCHEME

AMENDMENT NO. 10XXlXX

Special Control Area No.4

Wastewater Treatment Plant Odour Buffer

Amendment Report

Shire of Capell City of Bunbury

GBRS Amt No.1 OXX/XX - SCA No.4 - WWTP Odour Buffer Area Amendment Report - Version 1

Document Control

Version Date Author

31 Mar 2010 Wayne Burns

30 March 2010 Water Corporation

ABN 28 003 434 917

629 Newcastle Street

Leederville 6007

Western Australia

PO Box 100

Leederville 6902

Perth Western Australia

Tel (+61 8) 9420 2420

www.watercorporation.com.au

Reviewer

Steve Hiller

ii

GBRS Amt No.1 OXXIXX - SCA No.4 - WWTP Odour Buffer Area Amendment Report - Version 1

30 March 2010 Water Corporation iii

GBRS Amt No.1 Oxx/XX - SCA No.4 - WWTP Odour Buffer Area Amendment Report - Version 1

Executive Summary

Purpose

This report seeks to implement an amendment to the Greater Bunbury Region Scheme (GBRS) by:-

o Establishing the Oalyellup Wastewater Treatment Plant (WWTP) Odour Buffer Area; and

o Introducing provisions in the GBRS scheme text for SeA No.4 - Wastewater Treatment Plant Odour Buffer Areas, to give effect to the Oalyellup Wastewater Treatment Plant (WWTP) Odour Buffer Area.

WWTP and Serviced Catchment

The Oalyellup WWTP is located on Reserve 37116, Lot 5262 Minninup Road, Oalyellup (the site), a 45.7 Ha lot abutting the coastline approximately 6.5kms south of the Bunbury City Centre.

Population forecasting by the WAPC, ABS and City of Bunbury expects Bunbury's growth to continue at and about current annual rates of 5%, into the foreseeable future with an expected population of approximately 100,000, by 2031.

The Corporation has identified the Oalyellup WWTP, as the primary facility suitable for treating the expected wastewater flows generated by this increasing population. To this end, upgrades to the plant have recently been completed at a cost of $20 million, increasing its treatment capacity to allow it to service a population of approximately 75,000 people.

Future staged upgrades to the facility are also planned, to ultimately see its capacity further increased to cater for a population of 170,000 by 2060, representing the further investment of approximately $65 million (current value).

The Oalyellup Odour Buffer Area

Land uses such as residential, retail or entertainment uses, require higher levels of amenity for their successful operation than others. A buffer zone surrounding a WWTP ensures that these sensitive uses are not impacted upon by odour emitted from it. Ensuring that sensitive uses do not encroach to within the expected odour footprint of a WWTP ensures that its operations are safeguarded.

'Even with best practice odour control technologies and well managed plants, there will be a base level of odour emissions and at times higher odour emissions' (Wallis, 2007 Pg 11). Buffer zones surrounding WWTPs, allow residual odour generated from them to dissipate to acceptable levels without imposing adverse impacts on nearby sensitive uses.

30 March 2010 Water Corporation iv

GBRS Amt No.1 OXX/XX - SCA No.4 - I/IMITP Odour Buffer Area Amendment Report - Version 1

To determine the appropriate extent of the proposed odour buffer from the Dalyellup WWTP, the Corporation undertook scientific odour modelling from the current and future planned stages. This modelling incorporated the use of local meteorological data, sourced via an onsite weather station, erected in 2003.

The proposed odour buffer reflects the area the modelling indicates to likely be affected by odour nuisance. In this regard, the 5 odour unit level has been determined by the Corporation to be the level at which odour impacts upon the amenity of odour sensitive uses.

Sustainable Approach

The proposed amendment is considered to represent a sustainable approach towards managing odour from the Dalyellup WWTP, both in terms of protecting a sustainable treatment process and sustainable land planning practices. Specifically the proposal:-

o Protects a centralized wastewater treatment system, which presents a more efficient treatment system and reduced per capita power usage;

o Reduces impacts on land, through preventing the need for additional WWTPs to service the Bunbury catchment area;

o Protects a centralized wastewater treatment system, which offers increased future opportunities for the reuse of treated effluent;

o Safeguards the continued collection and treatment of toxic waste;

o Prevents the need for additional odour control technologies which are significantly costly, have limited effectiveness and are high consumers of power; and

o Safeguards the amenity of future landowners and users of land within proximity of the Dalyellup WWTP.

Wayne Burns Senior Town Planner J Manager, Development Services

30 March 2010 Water Corporation v


Table of Contents Executive Summary ............................................................................................................................. iv

Glossary ................................................................................................................................................. 9

1 Purpose ......................................................................................................................................... 10

2 Background .......................................................... , ....................................................................... 11

2.1 Dalyellup Wastewater Treatment Plant... ................... .. ..... .. ...... ... ..... .. .... ...... .. ..... .. ...... ........ 11

2.1.1 Location & Siting .............................................................................................................. 11

2.1.2 Plant Operations ....................................... .. ..................................................................... 12

2.1.3 Future Plant Upgrades ........... .. ...... .. ................................................................................ 13

2.2 Statutory Planning Framework ........................ .. ..... .. ..... .. ..... .. ....... .. .... .. .... .. ...... .. ..... ............ 13

2.2.1 Greater Bunbury Region Scheme .......................................................... .. ....................... 13

2.2.2 Statement of Planning Policy No.4.1 - State Industrial Buffer Policy ............................. 14

2.2.3 Shire of Capel Town Planning Scheme NO.7 .................................. .. .............................. 16

2.2.4 City of Bunbury Town Planning Scheme NO.7 ..... .. ...... .. ..... ..... ... .. ... .. ..... .. ...... .. ..... ... ...... 17

2.3 Strategic Planning Framework ............................................................................................. 17

2.3.1 State Planning Strategy ................................................................................................... 17

2.3.2 WAPC South West Growth Framework ..... ...................................................................... 18

2.3.3 Shire of Capel Land Use Strategy .............. .. .... ... .... .. ...... .. ...... ... ......... .. ..... ... .... ... ..... ...... 19

2.3.4 Dalyellup Beach Estate Local Structure Plan .................................................................. 20

2.4 Odour Modelling ................................................................................................................... 20

2.4.1 Collection of Local Meteorological Data ...... .. ..... ... ............................................. : ............ 20

2.4.2 Scientific Odour Modelling .................................. .. ...... .. ..... .. ...... .. .... .. .... .. ..... .. ..... .. .......... 21

3 Scope and Content of the Amendment ..................................................................................... 22

3.1 GBRS Maps .......... .. ............................................................................................................. 22

3.2 GBRS Text ............. ................................ ....... ....... ....... ...... .. ................................................. 22

4 Discussion .................................................................................................................................... 24

4.1 The Function of Wastewater Treatment Plants ......................... .. ......................................... 24

4.2 On-site Odour Controls ............ .. .......................................................................................... 24

4.3 Odour Sensitive Uses and Odour Compatible Uses .... .. ...... .. ..... .. ..... .. .... .. ..... .. ..... .. ..... .. ..... 25

30 March 2010 Water Corporation vi


4.4 Odour Buffer ... ........ .. ... .. ...... .. ................. ...................... ..... ....... .. ................... .... .. ... ... .. ......... 25

5 Environmental Protection Authority Advice ............................................................................. 26

6 Sustainability Appraisal .............................................................................................................. 27

6.1 Protection of an Efficient Treatment System ........................ .... ...... .. ............. ....................... 27

6.2 Reduction of Greenhouse Emissions & Costs to the Community ............................. .... ...... 27

6.3 Prevention of Odour Nuisance ................. ...... .. ........ ............................ .... .. ............. ............ . 27

6.4 Facilitate for Wastewater Servicing of the Region ......................... ........ ..................... .. ....... 28

7 Substantiality ............................................................................................................................... 29

7.1 Relationship of the Land to the Region .......... ................. ................................................ .... . 29

7.2 Purpose of the Land ...................... .... ................................................... ............... ... .... .......... 30

7.3 Scale and Purpose of the Proposal ..................................................................................... 31

7.4 Impact on the Environment .... ................... ...... ............... .. ..... .. ...... ...... ................................. 31

7.5 History of the Land ........................................ ..... .............................................. .................... 32

7.6 Future Planning Needs .................. ... .. ...... ........ .... ............. ..... ............. ................................ 32

7.7 Other proposals ......... ..... .......... ......... ............................ ... ........ ...... ............. ......................... 33

7.8 Affected Landholdings and Landowners ..... .... ...... ... .... .. ..... ........... .......... .... ....... ... .. ... ......... 33

7.9 Complexity .. ... .. .. ....... ..... ............ .... ..... .... .... .. .. ......................... .. .. .... .... ... ...... .... ... ...... ... ....... 34

7.10 Regional Planning Strategy ........ ........................... .... ....... .. ........ ................... ...... .. .............. 35

7.11 Strategic Planning ............................ ..... .. .......... .... .. ............................ .... .... ... ...................... 36

7.11.1 Statement of Planning Policy No.4.1 - State Industrial Buffer Policy ................. .. .... .. 36

7.11 .2 South West Growth Framework ............ .... ...... ... ...... .. ...... ........ .. ....... .......................... 36

7.12 Operation of the Scheme ..... ............ ..... ........... ..... ...... ...... .. ... .... ... .... ........ ......... .... ... ..... ...... 36

8 The Amendment Process ............................................................................................................ 37

9 Submissions on the Amendment ............................................................................................... 38

1 0 Hearings ........................................................................................................................................ 38

11 Modifications to the Amendment ............................................................................................... 38

12 Final Outcome .............................................................................................................................. 38

30 March 2010 Water Corporation vii


List of Tables Table 1: WAPC South West Growth Framework - Relevant Themes, Issues and Strategies ............. 19

Table 2: Schedule of Affected Landholdings and Landowners ............................................................. 34

List of Figures Figure 1: Dalyellup WWTP Location Plan ............................................................................................. 11

Figure 2: Dalyellup WWTP Aerial Photograph with LGA boundaries ................................................... 12

Figure 3: Greater Bunbury Region Scheme Zoning Map ......... .. ...... .. ...... ........ ...... ....... ....... ...... .. ......... 14

Figure 4: Shire of Capel Town Planning Scheme NO.7 Zoning Map ....... .. ................................. .. ........ 16

Figure 5: City of Bunbury Town Planning Scheme NO.7 Zoning Map ................................................... 17

Figure 6: WWTP Odour Buffer & WTP Chlorine Buffer. ........................................................................ 30

Figure 7: Cadastral Plan of Affected Properties .... .. ............. .. ...... .. ....................................................... 35

Appendices

Appendix 1 Dalyellup Beach Estate Local Structure Plan

Appendix 2 CEE Report - Odour Modelling for Bunbury WWTP and Recommended Buffer Zone

Appendix 3 Proposed Dalyellup WWTP Odour Buffer Area

Appendix 4 Proposed Zoning Map

Appendix 5 Odour Sensitive / Odour Compatible Land Uses

Appendix 6 Millennium Inorganic Chemicals - Dalyellup Waste Facility Information Sheet

30 March 2010 Water Corporation viii

GBRS Amt No.1 OXXlXX - SCA No.4 - Vl/VllTP Odour Buffer Area Amendment Report - Version 1

Glossary

ABS Australian Bureau of Statistics

DBELSP Dalyellup Beach Estate Local Structure Plan

EPA Environmental Protection Authority

GBRS Greater Bunbury Region Scheme

MLld Mega-litres (million litres) per day

OU Odour Units

PP (PU) Public Purposes (Public Utilities)

ROS Regional Open Space

SCA Special Control Area

SCH State Housing Commission

SPP 4.1. Draft Statement of Planning Policy No.4.1 (July 2009)

SWGF South West Growth Framework

SWRPC South West Regional Planning Committee

The Site Reserve 37116 Lot 5262 Minninup Road, Dalyellup

TPS Town Planning Scheme

WAPC Western Australian Planning Commission

WTP Water Treatment Plant

WWTP Wastewater Treatment Plant

30 March 2010 Water Corporation 9

GBRS Amt No.1 OXXlXX - SCA No.4 - WWTP Odour Buffer Area Amendment Report - Version 1

1 Purpose The purpose of the amendment is to:-

o implement the recommendations of State Planning Policy NO.4. 1.' State Industrial Buffers Policy;

o establish the Oalyellup Wastewater Treatment Plant (WWTP) Odour Buffer Area;

o insert provisions for SeA NO.4 - Wastewater Treatment Plant Odour Buffer Areas into the GBRS text, to give effect to the Oalyellup Wastewater Treatment Plant (WWTP) Odour Buffer Area; and

o prevent the introduction and intensification of land uses or development that would be incompatible with the ongoing operation of wastewater treatment works, or would be incompatible with expansion of the capacity of the treatment plant to the extent possible within the identified odour buffer.



2 Background

2.1 Oalyellup Wastewater Treatment Plant

2.1.1 Location & Siting

The Oalyellup WWTP is located on Reserve 37116, Lot 5262 Minninup Road, Oalyellup (the site), a 45.7 Ha site abutting the coast approximately 6.5kms south of the Sunbury City Centre, as shown on the location plan in figure 1. Located at the Shire of Capel's most northwestern extremity, the sites northern boundary abuts the Shire of Capel's boundary which adjoins the City of Sunbury.

Figure 1: Oalyellup WWTP Location Plan

The plant is sited within a natural depression of the coastal dunes, which obstructs sightlines to the north, south and east, and its western boundary abuts the Indian Ocean coastline. The adjacent lot to the east (Lot 2 Minninup Road, Oalyellup), is also owned by the Corporation and accommodates the Oalyellup Water Treatment Plant (WTP).

An aerial photograph of the site is provided under figure 2.


GBRS Amt No.1 OXx/XX - SCA No.4 - 'NVVTP Odour Buffer Area Amendment Report - Version 1

Figure 2: Oalyellup WWTP Aerial Photograph with LGA boundaries

2.1.2 Plant Operations

The Dalyellup WWTP was commissioned in 1972 and has undergone numerous upgrades since, to increase its treatment capacity in line with increasing demand and improvements to the treatment process. The most recent of these upgrades was completed in November 2008, which increased the facility's capacity from 9ML/d (megalitres per day), to its current capacity of 15 MUd. The work represented a $20 million investment by the Corporation in Sunbury's wastewater treatment infrastructure and enables the plant to service an estimated population of 75,000 people, which the ASS forecasts will be reached by 2017.

In serving the City's wastewater treatment needs, the plant performs a number of functions, including:-

o Removing detritus and other solid and gritty objects from wastewater;

o Removing organic solids and converting them into useful bi-products for reuse;

o Removing dissolved constituents to meet water quality standards;

o Removing nitrogen and phosphorus to meet environmental objectives;

o Removing pathogens to protect public health;

o Producing a reclaimed water stream for subsequent reuse; and

o Controlling odours and noise, to minimise adverse impacts on surrounding land.

The plant treats wastewater to a high standard capable of indirect reuse by groundwater recharge. Currently however, treated wastewater is disposed of through an ocean outfall which discharges 1.7km from the coast via a 120m long diffuser at a 10m depth.



2.1.3 Future Plant Upgrades

Between the 2001 and 2006 census years, Bunbury's population increased from 46,913 to 54,964, representing annual growth of approx 5%. Population forecasting undertaken by the ABS, WAPC, City of Bunbury and the Water Corporation, predicts this growth to continue into the foreseeable future with an expected population of around 100,000, by 2031 (www.bunbury.wa.gov.au. 2009).1

The Corporation has identified the Dalyellup WWTP, as the facility which is to be responsible for treating the increased amounts wastewater generated by this growing population.

Based on this forecast growth, the plants current treatment capacity is expected to be reached by approximately 2017, at which time further capacity upgrades will be required. The Corporation has planned staged upgrades to the plant beyond this time to ultimately see its capacity increased to 35MLld, catering for a population of 170,000 by 2060. In current dollars these upgrades represent a further investment in the community's wastewater treatment infrastructure of approximately $65 million.

Beyond this, investigations are being undertaken to determine the conceptual form of further capacity upgrades to the plant, should they be required. Should this analysis determine that these are necessary, the security of the odour buffer area will be critical in ensuring capacity upgrades are possible.

2.2 Statutory Planning Framework

2.2.1 Greater Bunbury Region Scheme

The Greater Bunbury Region Scheme (GBRS) is a regional planning scheme for land use in the Greater Bunbury area. The area covered by the GBRS stretches from Lake Preston in the north, Peppermint Grove Beach in the south, the Darling Scarp to the east, and covers the City of Bunbury and the Shires of Capel, Dardanup and Harvey.

The GBRS defines broad land uses within this area, dividing it into zones and reservations. Local governments for their part are required to ensure that their respective local TPS is consistent with the GBRS.

Currently the GBRS reserves the majority of land affected by the proposal, as Region Open Space and Public Purposes (Public Utilities). A 10 Ha portion of land is zoned Urban, which is further discussed in sections 2.3.4 and 7.8. A copy of the relevant portion of the GBRS zoning plan is set out in figure 3.

These population statistics relate to the Bunbury Statistical District which is the population of the urban centre of Bunbury and ignores local government boundaries. It is made up of all of the City of Bunbury and includes the adjacent urban and rural residential parts of the Shires of Dardanup (Eaton), Harvey (Australind) and Capel (Dalyellup)



Figure 3: Greater Bunbury Region Scheme Zoning Map

2.2.2 Statement of Planning Policy No.4.1 - State Industrial Buffer Policy

The WAPC's Draft Statement of Planning Policy NO.4.1 - State Industrial Buffers Policy applies to all proposals for new industrial areas, uses and essential infrastructure throughout the state, and sensitive uses (uses which are dependent upon a high level of amenity, attract large numbers of people or operate predominantly in the evening or at night) in proximity to industrial areas and essential infrastructure.

A key requirement of the policy is the use of offsite buffers and special control areas within planning schemes, to provide adequate separation between infrastructure and sensitive uses.

Annexure A of the policy deals specifically with wastewater infrastructure and stipulates that where odour emissions cannot be contained on-site, the infrastructure provider will provide a buffer in accordance with EPA guidelines. Once established odour sensitive uses should not be located within WWTP Odour Buffer Areas

In accordance with the policy, the proposal seeks to apply an odour buffer from the Dalyellup WWTP as an SCA in the GBRS.



2.2.2.1 EPA Guidance Statement No.3

In 2005, the EPA released Guidance Statement No.3 - Separation Distances between Industrial and Sensitive Land Uses, replacing the previous version dated 1997. The guidance statement addresses generic separation distances between industrial and sensitive land uses, to avoid or minimise conflict between these land use types. The guidance statement focuses on protecting the amenity of sensitive land uses from unacceptable impacts resulting from industrial activities and infrastructure.

The guidance statement is intended to complement and assist the implementation of SPP No.4. 1, via the provision of generic separation distances from different industrial land uses and infrastructure types, within Table 1: Separation Distances between Industrial and Sensitive Land Uses. An unfortunate amendment from the previous 1997 version has been the deletion of generic separation distances for sensitive land uses from WWTPs. In this regard, the guidance statement states 'that buffer studies are in progress to determine appropriate separation distances'. The Corporation considers that such studies have now been completed and is liaising with the EPA and WAPC to reflect these within either SPP No.4.1 or EPA Guidance Statement No.3.

2.2.2.2 EPA Guidance Statement No.47

In 2002, the EPA released Guidance Statement No. 47- Assessment of Odour Impacts from New Proposals. This Guidance Statement is currently under review, however interim guidance is provided, which sets out a three-step process for assessing the odour impact of new proposals or significant expansions of infrastructure, in the following terms:

i) If generic buffer distances are met and the proposed facility is designed for 'best practice' emission control then no further assessment of odour is required.

ii) If a generic separation distance is not met, it may nevertheless be possible for the proponent to demonstrate acceptability by undertaking a conservative but relatively simple screening procedure which assesses odour impact against a two-part "green light" criterion, as follows:

• Computer modelling must be undertaken using either a measurement or reliable estimate of odour emission rate (in odour units per second, ou/s) in order to demonstrate that the ambient odour concentration does not exceed the following two-part "green-light" criterion at existing or proposed sensitive premises:

Part 1

Part 2

2 OU at 99.5 percentile at 3 minute averaging period; and

4 OU at 99.9 percentile at 3 minute averaging period.

• If the above two part criterion is met, no further assessment of odours is needed.

iii) Proposals which do not meet the two-part "green-light" criterion above will be assessed on a case-by-case basis, including a determination of the form of odour impact study required.

The Corporation favours using a distinct level of odour, considered for this type of wastewater treatment plant to be 5 OU, and the 99.9 percentile at a 1 hour level of



achievement. The 99.9 percentile odour criteria provides a high level of protection to the community against odour nuisance, as this percentile limit allows exceedence of the odour criterion for only 8 hours per year. In contrast, a 99.5 percentile limit would permit exceedence of the odour criteria at each site in the area around the plant for 44 hours per year.

Based on correlation of odour complaints, perception survey results, and odour modelling around the existing Subiaco, Broome, Mandurah, Woodman Point and Beenyup WWTPs, the Corporation has confirmed that the distinct level of odour corresponds to the predicted 5 OU level, at a 99.9 percentile frequency for a 1 hour averaging period. Further explanation of the scientific odour modelling process is provided under section 2.4.

2.2.3 Shire of Capel Town Planning Scheme No.7

The Dalyellup WWTP site is located at the north-western extremity of the Shire of Capel. Accordingly, the southern portion of the proposed odour buffer area is covered by the Shire's current Town Planning Scheme No.7, for which the relevant Zoning Map, is shown in figure 4.

The proposed odour buffer largely comprises land which is reserved under the GBRS for Public Purposes (Public Uses) and as Regional Open Space, however, a 10Ha triangular portion of land is zoned Urban Development under the scheme. This portion of land is owned by Homeswest and comprises a portion of its Dalyellup Beach Estate which is further discussed in section 3.1.7.

Figure 4: Shire of Capel Town Planning Scheme No.7 Zoning Map


GBRS Amt No.10XX/XX - SCA No.4 - WWTP Odour Buffer Area Amendment Report - Version 1

2.2.4 City of Sunbury Town Planning Scheme No.7

Although the Dalyellup WWTP site is located within the Shire of Capel, the proposed odour buffer area extends into the south-western corner of the City of Sunbury. In this regard, the City's current Town Planning Scheme No.7 covers this area, which is entirely reserved under the GSRS for Regional Open Space.

A copy of the relevant portion of the City of Sunbury's TPS No.7 - Zoning Map, is provided under figure 5.

INDIAN

OCEAN

Figure 5: City of Bunbury Town Planning Scheme No.7 Zoning Map

2.3 Strategic Planning Framework

2.3.1 State Planning Strategy

First published in 1997, the State Planning Strategy provides the basis for long-term state and regional land use planning and coordinates a whole-of-government approach to land use planning. Eight discussion papers covering a range of issues beyond the scope of the strategy were prepared (including one addressing public utilities and servicing issues), and from these, strategies and actions are provided to various regions within the state.

With regard to the south west region, the strategy focuses on protecting environmental and cultural features, planning for tourism, recognising opportunities for economic growth and adopting a strategic approach to service infrastructure within the region.


GBRS Amt No.1 OXXJXX - SCA No.4 - WWTP Odour Buffer Area Amendment Report - Version 1

2.3.2 WAPC South West Growth Framework

The South West Growth Framework (SWGF) is a broad strategic planning document, which provides guidance to the future development of Western Australia's South West region over the next 20 years, and includes the area covered by the GBRS.

The framework was endorsed by the WAPC in October 2009, and addresses planning issues expected to be encountered as a result of forecast population growth and development. The framework identifies issues the WAPC considers to be crucial in the regions development and details its position in regards to preferred strategies to address these.

A selection of these issues and their associated strategies, which are considered to relate to the proposed amendment are provided in Table 1.

The SWGF also identifies a preferred settlement hierarchy of urban centres within the region. Within this hierarchy, the City of Bunbury (including the urban areas of Eaton, Australind, Oalyellup & Gelorup) is identified as the Regional Centre for the South West region. The framework identifies that expected growth rates within the City are likely to remain high, and that the City should plan to consolidate its position as the focus for retail, commercial and industrial activity, and accommodate a significant portion of the expected population growth within the region.

The growth forecast by the SWGF, supports the Corporation's infrastructure planning for the region, particularly in relation to the recent upgrades to the Oalyellup WWTP. In seeking to protect infrastructure considered vital to service the future of Bunbury, the proposed amendment is considered to be consistent with the strategic direction detailed within the SWGF.


GBRS Amt No.1 OXX/XX - SCA No.4 - WNTP Odour Buffer Area Amendment Report - Version 1

Themes Key Issues 1 I I

Striiltegies --suiidi"ng---'---" -.Buiia-so-claTcapitiii.iii ...... ··-.. ··· .. ---- --~Proviae·ior-eariy-estiibiishment-ofsoCiai---------------.. -. Inclus;ive Communities infrastructure in developing communities. Communltfes ·Ensure that essential services are readily

, ___ ._. ___ .. _ __ . ____ ._. __ ... _ ... __ ._._ ... _ .. ___ .~cce~~!~~~_!~_~)J.~~!!I.~~.r:~.~f.~Q~_g_~!!.l_JI!~!2i.~: ___ .. ____ _ 1 Coordinate efforts between 1 O{dentify appropriate locations for essential j Commonwealth, State & Local I services and set aside land during p.lanning 1 government and communities to I stages of development. 1 identify and fiU gaps in social I ·Include planning for socia,. services in land use U!!f[~~~!.~~!~~~:._ ... __ ...... _ ................... lp.!~!}~!,!}.9 .. P.r-~2~~_~_~_~:. __ ._._._ .. _. __ . ____________________ .. _ ..... __ ... ___ .. _. 1 Maximise the use of eXisting I ·Use and manage existing infrastructure efficiently I infrastructure I and effectively to maximise community benefit I I ·Protect infrastructure corridors and sites from 11 incompatible development.

._ •• _--------••• __ •• _..j._ •••• __ ••• __ •••••••••••••••••• - •••••• _ ._ .... _ •••• ..j •••• _._ •••••••••• _ ••••.•. _--_.-----------_._._-----------------------••• _ ._ •••••••• -Building 1 Support strategies and plans 1 ·Promote Sunbury as the regional centre for the Sustainable l that encoltfage sustainable I South-West and expand this role to ensure a Communities I growth in centres that provide a I greater range of services.

1 high level of amenity and I ·Provide for a range of housing, industry and I employment opportunities to i employment sectors, supported by appropriate

1··E~~~i~fn~ql~~~<?~~~ity··urban···· :··~~~~~~ik~a~!-~-~~~~~~!~~f~if~~--cent-res·thrOUgh·· I sprawL increasing densities in centres to prevent urban , .... _ .. _ ............................ _ ....... _ ... _ ... _ ........ ~P.I~~!:_ ... __ .. __________________________ .. __ ____ ._. ___________ ............ _ ....... . i Build on eXisting communities ! ·Concentrate retail , employment, recreational and i with established infrastructure j other activities which attract large numbers of j and services. ' I people in and around existing well serviced

c,imaie-li·-coriiribliie·to-mlt1gatfo·o·or········· .. i·~~*~--i~~~j~-pme-nt-th-at-ls--ene-rgy--efficrenTiind··· Change climate change in the South- reduces the amount of household waste.

West. Economic-Tsup·porfstrengthenirig·onhe········l··~·Ensure··su-p·piy-offndu-strlaT"ancfbusln-ess······-······· .. ·-Growth and I existing economic base and i development land, serviced with an adequate Industry ! encourage diversification in !Ievel of infrastructure.

i industrial and commercial i ·Identify industry precincts that facilitate I sectors in order to promote I establishment of industry clusters and j growth in traditional as well as I partnerships. i suitable knowledge based, i ·Promote the role of Sunbury as the regional j high-value and specialised j centre for the South-West to provide a focus for i industries. 1 services and investment.

Table 1: WAPC South West Growth Framework - Relevant Themes, Issues and Strategies

2.3.3 . Shire of Capel Land Use Strategy

The Shire of Capel's Land Use Strategy was adopted by the Council in April 1999, as a

strategic planning document which identifies the broad land planning issues, objectives and preferred uses within the Shire, on a precinct by precinct basis.

The proposed odour buffer sits within the BU6 - Ge/orup/Oalyel/up precinct, for which the

stated objective is to provide for urban expansion, whilst conserving areas of natural environmental value. The strategy identifies urban expansion as being appropriate in the

existing eastern Gelorup and Dalyellup urban areas, with conservation of natural

environmental features intended to maintain the coastal dune areas (including those within



the proposed SCA surrounding the Dalyellup WWTP site). No mention is made of protecting the Dalyellup WWTP from encroachment by incompatible uses.

2.3.4 Dalyellup Beach Estate Local Structure Plan

The original Dalyellup Beach Estate Local Structure Plan (DBELSP) is dated 29th April 1998, and was endorsed by the WAPC in May 1999. In June 2003 the Shire of Capel resolved to adopt the first review of the DBELSP, subject to a number of minor modifications, which was subsequently endorsed by the WAPC on the 30th December 2003. The current version of the plan is dated 29th May 2008 and a copy is contained in Appendix 1.

A southern portion of the proposed WWTP Odour Buffer Area extends over a western portion of the DBELSP, referred to as the Greenpatch precinct. In this regard, all versions of the DBELSP have identified this as an 'area for further investigation for urban land use options', with further denotations on the plan identifying 'future urban land use options are to have regard to odour buffer requirements '.

The scientific odour modelling undertaken by the Corporation (section 2.4), indicates that the expected odour footprint from the plant will extend over approximately 50% of this area, which is reflected by the proposed odour buffer.

The Corporation has liaised with the developers of the Dalyellup Beach Estate (Satterley) with respect to the scientifically modelled odour footprint in this vicinity. Conceptual planning for the Greenpatch precinct involving the Corporation has demonstrated that development of the precinct is possible, in a manner which respects the proposed Odour Buffer Area. It is understood that future versions of the DBELSP will reflect the proposed odour buffer area.

2.4 Odour Modelling

2.4.1 Collection of Local Meteorological Data

To determine an appropriate odour buffer area the Corporation undertook scientific odour modelling of the anticipated odour footprints from the current and future stages of the Dalyellup WWTP.

In order to run the required models, local meteorological data was inserted into a computer generated program in order for accurate odour level contours to be generated. To obtain this data, a weather station was erected on the site in 2003, which collected data for a three year period at 10 minute intervals, including:-

o Wind speed and wind direction at 10m above ground level;

o Air temperature at 2m and 10m above ground level;

o Solar radiation levels; and

o Sigma theta of wind direction variations.

From the sourced data, meteorological files were produced for use in the modelling process.


GBRS Amt No.1 OXx/XX - SCA No.4 - WNTP Odour Buffer Area Amendment Report - Version 1

2.4.2 Scientific Odour Modelling

The Corporation engaged Consulting Environmental Engineers (CEE), who are nationally recognised leaders within the odour modelling field, to undertake the scientific odour modelling of the Oalyellup WWTP.

In effecting the required model, CEE established odour emission rates from the current and future stages of the plant, based on actual readings taken from the plant and comparable examples such as the Woodman Point WWTP.

These odour emission rates were then run against the data contained within the local meteorological files via the Ausplume Model Version 6. a software package, which is issued by the Victorian EPA. CEE ran models for odour levels from the facility in its current form as well as for future scenarios of the plant following various planned upgrades, to ascertain an appropriate buffer for the medium and long-term life of the plant.

CEE's report titled Odour Modelling for Bunbury WWTP and Recommended Buffer Zone, is contained under Appendix 2 and provides a detailed and comprehensive discussion of the above process, its results and justification for the recommended odour buffer.


GBRS Amt No.1 OXX/XX - SCA No.4 - WWfP Odour Buffer Area Amendment Report - Version 1

3 Scope and Content of the Amendment In seeking to amend the GBRS, the proposal seeks to insert provIsions relating to an additional Special Control Area (Special Control Area No.4 - Wastewater Treatment Plant Odour Buffer Areas) into the scheme text. Currently these provisions are proposed to relate to a single identified WWTP Odour Buffer Area, which covers the scientifically modelled odour footprint from the Oalyellup WWTP. Moving forward, however, the Corporation intends to seek additional WWTP Odour Buffer Areas from its various other WWTPs operating within the GBRS area. The reasons for this approach are discussed in section 7.7.

The modifications and additions proposed to the GBRS are as follows.

3.1 GBRS Maps To establish Special Control Area No.4 - Wastewater Treatment Plant Odour Buffer on the GBRS Map, as depicted on the proposed zoning map provided under Appendix 4.

3.2 GBRS Text To insert the following provisions in the GBRS text:-

Division 5 - Wastewater Treatment Plant Odour Buffer Areas

24. Purposes - SCA No.4

The purposes of SCA No.4 are to:-

(a) implement State Planning Policy No.4. I : State Industrial Buffers PoliCy;

(b) identify land likely to be subject to offsite odour impacts from Wastewater

Treatment Plants; and

(c) to ensure that the use and development of the land is compatible with the

ongoing operation and expansion of the capacity ofthe treatment plant to the

extent possible within the identified odour buffer.

25. Planning requirements - SCA No.4

(1) The following uses are not permitted in SCA No. 4:-

30 March 2010

(a) residential accommodation uses including single, grouped or multiple

residential dwellings, caravan parks or temporary, short stay or holiday

aGcommodation;

(b) Commercial uses including shops, showrooms, any other retail uses, betting

agencies, markets and offices;

(c) Entertainment or service uses including restaurants, eateries, taverns, night

clubs, consulting rooms cinemas and theatres, amusement parlours or fast

food outlets;

Water Corporation 22


(d) Health, education and civic uses including schools, child care facilities, educational establishments, medical centres, corrective institutions or places

of worship.

(2) In considering an application for planning approval in SCA No. 4, the Commission is to have regard to:-

(a) whether the proposal will suffer adverse impacts from possible odour

emissions, or may, by its nature potentially jeopardize the continued operation

of the Wastewater Treatment Plant, or limit the Wastewater Treatment Plant from operating at its planned ultimate capacity;

(b) any other relevant planning and environmental considerations including, but

not limited to, provisions of the State Planning Framework, and policies of the Department of Environment and Conservation;

26. Consultation

In considering an application for subdivision or development approval with respect to land

wholly or partly within SCA No.4, the Commission is to consult with the Water Corporation

for comment and due regard is to be given to the recommendations and comments provided

by the Corporation, prior to detennining the application.

Indexation of all following clauses within the scheme text should then be amended accordingly.


GBRS Amt No.1 O-XX/XX - SCA No.4 - I/IfINTp Odour Buffer Area Amendment Report - Version 1

4 Discussion

4.1 The Function of Wastewater Treatment Plants Wastewater Treatment Plants receive and treat all of the liquid and associated suspended solids generated from within their catchment areas, by the network of gravity and pressure mains which convey wastewater to it. In facilitating this task, a modern plant is required to perform several functions, including:-

o Removing detritus and other solid and gritty objects from wastewater;

o Removing organic solids and convert them into useful products for reuse;

o Removing dissolved constituents to meet water quality standards;

o Removing nitrogen and phosphorus to meet environmental objectives;

o Removing pathogens to protect public health;

o Producing a reclaimed water stream for subsequent reuse; and

o Controlling odours and noise, to minimise adverse environmental effects on nearby surrounding areas.

Due to the substantial establishment costs and of the WWTP and the associated conveyance network, which is designed and constructed to suit its location, it is not feasible to relocate a plant.

4.2 On-site Odour Controls Due to the nature of the functions performed by a WWPT, 'even with best practice odour control technologies and well managed plants, there will be a base level of odour emissions and at times higher odour emissions' (Wallis, 2007 Pg 11).

In the design and construction of WWTPs, a range of technologies and design considerations are afforded to the control of odour emissions from the plant. The nature and extent of technologies available are largely determined by the specific design and size of the plant and its conveyance network.

The costs of odour control technologies are also a determining factor. In this regard, the cost of mechanical improvements to reduce the level of odour emissions emanating from a plant often constitutes a significant portion of the total cost of the plant. Using the example of the 8eenyup WWTP, staged retrospective odour control technologies, required due to significant encroachment by odour sensitive uses, have cost the Corporation in the order of $60 million since 2004 and further significant expenditure will still be required to resolve this situation. Furthermore, onsite odour control technologies are heavy consumers of power, increasing the operational costs of the plant and producing a greater amount of greenhouses gases.

In balancing the capital, operational and environmental costs of odour control technologies, a point is reached, where the level of odour reduction possible cannot be justified when conSidering the associated costs to the community. Accordingly it is an approach that the Corporation is keen to avoid in the interests of the wider community and the State Governments sustainability objectives.


GBRS Amt No.1 OXX/XX - SCA No.4 - VWVTP Odour Buffer Area Amendment Report - Version 1

4.3 Odour Sensitive Uses and Odour Compatible Uses Land use planning within Western Australia and abroad, accepts that particular land uses require a higher level of amenity in order to function than others. Amenity in a land use planning sense refers to the liveability of a locality, created by the physical, social and environmental features of an area, including, but not limited to, its comfort, convenience, cleanliness, aesthetics, natural features and cultural attributes.

Land uses such as residential, tourism, restaurants, retailing and the like, depend upon a high level of amenity as their primary purpose involves accommodating people in an enjoyable setting. Conversely, land uses such as manufacturing, agriculture, warehouses, public utilities or materials processing are less dependent upon amenity factors due to their operational requirements.

Offensive odours emitted from public infrastructure such as WWTPs or industrial uses may impact upon the amenity of a locality and certain land uses, referred to as odour sensitive uses. Ensuring that uses that require a high level of amenity are not affected by odour is therefore consistent with orderly and proper planning. In order to ensure that odour sensitive uses are not affected by its infrastructure, the Corporation (and WAPC) recommends land use controls, which ensure that only uses which are not affected by odour nuisance (odour compatible uses) locate within identified odour buffer areas.

The table provided under Appendix 4, provides clarity as to which uses the Corporation considers to be odour sensitive uses and those considered odour compatible uses.

4.4 Odour Buffer An odour buffer area from a WWTP, allows residual odour generated by its operation, to dissipate to acceptable levels without imposing adverse effects on surrounding odour sensitive land uses, located outside of the buffer area.

The odour buffer area ensures that odour sensitive uses are not compromised by a plants operations and conversely, prevents encroachment of sensitive uses to the facility, safeguarding its operations.

In the event that an odour buffer is compromised by odour sensitive uses, the ramifications to the community can be severe. Additional odour control technologies involve extremely high capital costs and financial and environmental operating costs are imposed on the community as a result.

Encroachment of odour sensitive uses within an odour buffer can also mean that the level of service a WWTP is able to provide is reduced, or the ultimate planned capacity of it cannot be achieved. This outcome can be a limiting factor to the development potential of the catchment area.



5 Environmental Protection Authority Advice

{to be inserted following the receipt of advice from the EPA}


GBRS Amt No.1 OXX/XX - seA No.4 - VVWTP Odour Buffer Area Amendment Report - Version 1

6 Sustainability Appraisal

6.1 Protection of an Efficient Treatment System The Corporation has in its infrastructure planning sought to develop a centralised wastewater solution for the Bunbury Wastewater Scheme, with the Dalyellup WWTP representing the key piece of infrastructure within this system. Such a system presents greater efficiencies by way of the schemes economy of scale, resulting in:-

o reduced per capita power usage;

o reduced impacts on land; and

o increased opportunities for the reuse of treated effluent.

In establishing a network on these principles it is essential that the operations of the Dalyellup WWTP be protected from constraints including encroachment by sensitive land uses, which could potentially compromise its operations.

6.2 Reduction of Greenhouse Emissions & Costs to the Community Whilst the provision of an adequate odour buffer does not substitute good onsite odour control practices, the encroachment of odour sensitive uses to within close proximity to the plant, may necessitate additional odour control technologies to be retrospectively implemented. This is undesirable.

Current technologies for onsite odour control are heavy consumers of power and their adoption would see the facility's carbon footprint significantly increased.

Further, such measures are extremely expensive and funds to implement, would be required to be sourced from Treasury. These funds are for the wider community's needs and its diversion for preventable WWTP upgrades is not considered to represent its highest and best use.

6.3 Prevention of Odour Nuisance The proposed amendment seeks recognition of the potential of odour nuisance from the Dalyellup WWTP within regional and local planning schemes. In doing so, the proposal will assist appropriate decision making with respect to land use proposals within vicinity of the plant. This improved planning and development framework will have associated societal benefits by safeguarding the amenity of future landowners and users of land.


GBRS Amt No.1 OXX/XX - SCA No.4 - WVVTP Odour Buffer Area Amendment Report - Version 1

6.4 Facilitate for Wastewater Servicing of the Region Population forecasting and strategic planning clearly establish that the Sunbury region is expected to continue experiencing high levels of population growth and subsequent development into the long term. This growth translates into increased volumes of wastewater to be collected and treated, in order to prevent pollution and damage to the environment.

The Dalyellup WWTP has been identified as the facility which will primarily facilitate the treatment of the increasing amounts of wastewater produced by the region. In order to allow for the facility's expansion, an adequate buffer is required to ensure residual odour emissions, are able to dissipate to acceptable levels without affecting sensitive uses.

In protecting the plants expansion and operation, the proposed amendment is directly safeguarding the ability for the Corporation to collect and treat toxic waste in an environmentally sustainable manner.

The Corporation owns and operates the Dalyellup WWTP on behalf of the residents and industries in the Sunbury region, and by virtue of this the plant belongs to the community it serves. Therefore, it is in essence the responsibility of the relevant planning authorities representing the Sunbury region to ensure that the WWTP is protected in order to achieve the future land use plans. Should the plants capability and capacity be constrained by encroachment of odour sensitive uses, there is a risk that the ultimate planned capacity of the plant will not be achieved and thereby limit the ability of land use planning for the future of Sunbury to reach fruition.



7 Substantiality The Planning and Development Act, 2005 allows for amendments to a region scheme to be processed as either "minor" or "major" amendments depending on · whether they are considered to constitute a substantial alteration to the scheme or not.

WAPC "Development Control Policy 1.9 - Matters to be Taken Into Account When Deciding Substantiality for the Purpose of the Act", sets out the criteria for determining whether the major or minor process should be followed. The criteria relate to a variety of matters, not all of which relate to every amendment. A discussion of the various relevant criteria is provided below, which indicates that the proposal should be considered as a minor amendment to the GBRS.

7.1 Relationship of the Land to the Region

Present land use and character of the land and its relationship to its immediate setting, to the surrounding district, to the sub-region and to the region as a whole as a prelude to evaluation of the impact of new proposals.

The land affected by the proposed Oalyellup WWTP Odour Buffer Area is largely undeveloped and reserved under the GBRS for ROS (for conservation purposes) or PP (for use by public utilities) .

Land reserved for ROS, represents the majority of the affected land and is in place to preserve the natural coastal dune environment, surrounding the site. These conservation uses represent an ideal land use synergy with the proposed odour buffer, as restricting development of the land, will aid in the preservation of the areas natural environment.

The proposed SCA also represents a mutual land use relationship to the adjacent Oalyellup WTP, from which the Corporation recommends a 100m safety buffer be maintained. The proposed WWTP Odour Buffer Area encompasses the WTP chlorine buffer, as demonstrated in figure 6, and its adoption will assist in maintaining development a safe distance from the storage of potentially harmful chlorine gases.

From a regional perspective the Oalyellup WWTP is vital to the City of Bunbury and its surrounding suburbs. The plant currently serves the majority of the City's wastewater treatment needs and moving forward, is expected to cater for much of its expected growth.


GBRS Amt No.1 OXXlXX - SCA No.4 - INWTP Odour Buffer Area Amendment Report - Version 1

Figure 6: WWTP Odour Buffer & WTP Chlorine Buffer

7.2 Purpose of the Land

The particular purposes for which the land is to be set aside and the proposal for changes to the zoning and/or reservation of land and the impact upon present land use and existing land classifications in the Scheme.

The sites reservation for Public Purposes (PU) , within the GBRS demonstrates that the intended purpose of the site is to accommodate the Dalyellup WWTP. Accordingly, the proposed amendment, which seeks to ensure land use planning and development surrounding the facility is compatible, is considered to be largely consistent with the existing land uses and land classifications of the scheme.


GBRS Amt No.1 OXX/XX - SCA No.4 - VVVVTP Odour Buffer Area Amendment Report - Version 1

Given the status of existing land use classifications within the scheme, the impact of the proposed amendment is considered to be minor. The undeveloped nature of the land also ensures that no non-conforming uses will result from the adoption of the amendment, with the main effect of the proposal to:-

o Direct any future development or land planning proposals within the ROS reserves to be compatibility with the Dalyellup WWTP; and

o Define the extent of residential development associated with a minor portion of the Dalyellup Beach Estate, whose LSP already recognises the need for the odour buffer to be defined (see section 2.3.4).

7.3 Scale and Purpose of the Proposal

The area of land involved in the rezoning and the scale and purpose of the proposal and its impact on the Scheme.

The proposed amendment affects approximately 205Ha of land, however, it is worthy to note that this area is largely comprised of the following land ownerships, which are not considered to be significantly affected by the proposal:-

o 106.6 Ha, owned by the Corporation for the purposes of operating and expanding the Dalyellup WWTP and WTP;

o 47.8 Ha, reserved for ROS for conservation purposes and owned by the City of Bunbury;

o 31.6 Ha reserved as ROS and owned by the State Housing Commission and;

o 21.7 Ha reserved as ROS and owned by Landcorp. The site is currently let to Millennium Inorganic Chemicals for use as a landfill facility storing an inert nonhazardous clay-like material, comprised mainly of iron hydroxides. The material is generated from its titanium dioxide manufacturing plant in Kemerton. An information brochure is attached in Appendix 5, which provides further information on this operation.

The area considered to be most affected by the proposal is 9.3 Ha of land zoned Urban under the GBRS, owned by the Department of Housing (Housing Authority).This land is discussed under section 2.3.4.

Table 2 (section 7.8) provides full details of all lands affected by the proposal.

7.4 Impact on the Environment

The likely impact of the proposal on the environment of the affected land and its surroundings.

Adoption of the amendment is considered to be beneficial to the environment, as it will aid in the preservation of the existing natural environment and protect the amenity of future surrounding land uses.


GBRS Amt No.1 OXX/XX - SCA No.4 - IMNTP Odour Buffer Area Amendment Report - Version 1

7.5 History of the Land

The history of the land within its setting, the factors which determined the present zoning or reservation of the land and its environs and the reasons justifying the proposed change to be made.

The Dalyellup WWTP has been in operation since 1972, although numerous upgrades and improvements since have modified its size, form and operations. These upgrades have been effected primarily to ensure the capacity of the plant keeps pace with the increasing population of Bunbury and to refine the treatment process to provide a higher quality effluent. The plant site was initially chosen for its isolated location and proximity to the coast to dispose of treated wastewater via the 1.7km ocean outfall.

Current zonings and reservations within the GBRS reflect the sites existence. These reservations were implemented at the time the GBRS was first established in 2007 and have largely been implemented for environmental conservation purposes. In this regard, the EPA's assessment of the scheme in this vicinity supported the reservation of the land, as it was considered to represent an outstanding regionally significant natural area, which displayed the following values:-

o Landscape diversity;

o Geomorphological diversity;

o Vegetation structural unit diversity;

o Part of the Dalyellup/Gelorup/Crooked Brook Ecological Linkage;

o Species diversity; and

o Outstanding habitat values.

Notwithstanding the current status of the affected land, reflects compatibility of land uses with the plant, adopting the SCA will ensure any future development or land planning proposals consider the plant and its operations.

7.6 Future Planning Needs

The future planning needs of the region and the factors justifying changes in the use of land generally and the subject land in particular.

The WAPC's publication South West Growth Framework, identifies that the south west region and City of Bunbury in particular, are expected to experience high levels of population growth and development in the immediate to long-term. Accordingly, protecting the regions service infrastructure assets is vitally important in ensuring service capabilities are in place to support this growth.

The proposed amendment seeks to insert land use controls into the GBRS, over land surrounding the regions most significant wastewater servicing asset. Encroachment of odour sensitive land uses to WWTPs can potentially limit their service capacity, and therefore, the adoption of the proposal aids in safeguarding a key piece of infrastructure, which is essential to support the planned development of the region.



7.7 Other proposals

Any other proposals in the same general locality promoted or likely to be promoted for changes to existing land classifications and their combined impact on the Scheme as a whole..

In accordance with the recommendations of SPP 4.1, the Corporation intends to seek recognition of all of its \l'NllTP odour buffers via regional or local planning schemes. The Corporation currently considers protection of the Oalyellup \l'NllTP to be its highest priority, due to its significance to the growing regions current and future wastewater treatment needs.

In due course, the Corporation expects to pursue the adoption of similar controls to its various other \l'NllTPs and for this reason the proposed amendment avoids specific reference to the Oalyellup \l'NllTP, with the intention that its provisions will be effective for future additional \l'NllTP Odour Buffer Areas.

The Corporation does not consider it to be an appropriate course of action, to seek the adoption of all of its odour buffer areas at once, for the following reasons:-

o The Corporation has not had the opportunity to model the odour footprints from all of its \l'NllTPs, due largely to a lack of site specific meteorological data.

o The infrastructure planning associated with many of its assets can be dynamic and the role, size and type of a treatment plant can change in response to specific needs, changes in technology, or changes in demographic patterns or forecasting .

o In order to minimize the complexity of its land planning proposals the Corporation prefers to address each of its \l'NllTP odour buffers individually. In this regard, the Corporation recognises the need for the community to be engaged in relation to the role of its infrastructure assets.

7.8 Affected Landholdings and Landowners

The number of land holdings and land owners likely to be directly affected by the proposals contained in the amendment.

Whilst reducing the current level of risk to the Oalyellup WWTP, the proposed amendment does not impose any significant impacts to affected landholdings or landowners.

Lots 9041 & 9076, which are currently zoned Urban under the GBRS, are considered to be the most affected landholdings by the proposal. In this regard, the proposal affects 9.41 Ha (43%) of these lots and the Corporation has worked with the landowner's representatives to ensure that the future development of the land is compatible with the proposed odour buffer area.

Table 2, identifies all landholdings and landowners affected by the prop~sal including the areas of each which are affected by the proposal.


GBRS Amt No.1 OXX/XX - SCA No.4 - VVWTP Odour Buffer Area Amendment Report - Version 1

Loti Owner Lot Area Affected Reserve (Ha) Area (Ha)

626 (P188497) City of Bunbury 54.1 35.9

1 (094794) Water Corporation 11 .8 11.8

2 (089772) Water Corporation 49.1 49.1

5262 (P183035) Water Corporation (The Site) 45.7 45.7

9077 (P60716) Landcorp (Let to MHlennium) 21 .7 21 .7

9041 (P50649) Homeswest 12.0 6.96

9076 (P55511) I Homeswest 9.7 2.45

452 (P302624) I State Housing Commission 13.3 5.1

451 (P302624) State Housing Commission 13.7 13.1

450 (P302624) State Housing Commission 13.6 13.6

Total 244.7 205.41

Table 2: Schedule of Affected Landholdings and Landowners

The location of the affected landholdings detailed above, are shown on the cadastral plan in figure 7.

7.9 Complexity

The complexity of the proposal.

The proposed amendment is considered to be straightforward an uncontentious. The proposal seeks the following modifications to the GBRS:-

o The insertion of additional SCA provisions (SeA No.4 - WWTP Odour Buffer Areas) , within the scheme text.

o The depiction of a WWTP Odour Buffer Area on the GBRS Maps in accordance with the alignment of the scientifically modelled Oalyellup WWTP Odour Buffer Area.

I n accordance with section 124 of the Planning & Development Act 2005, a corresponding action will then be required to be resolved by the respective local governments, to ensure consistency of the affected TPS with the GBRS.



.... :/

• I

,

'j" •

I ,

;

1/

; , I l 1/

/ / I .I .

( ( I f.

// .f //

:: / J

...... Mn

IU .~,

. ...,."

...... u, ..

Figure 7: Cadastral Plan of Affected Properties

7.10 Regional Planning Strategy

• I~ ..

.........

U.S".

tl~· ..

' .. IIJ\I .. . ) .

The degree to which the proposal reflects any significant changes to the planning strategy for the region.

The proposed amendment seeks to implement land use controls, which will aid in safeguarding infrastructure that is essential in supporting the development patterns and hierarchy recommended within the Commission's South West Growth Framework.



7.11 Strategic Planning

The relationship of the proposal to any current or proposed strategic plans or policies for the region or sub-regions within that region.

The proposal is consistent with the objectives and recommendations of the WAPCs strategic planning framework, specifically in regards to the following publications.

7.11.1 Statement of Planning Policy No.4.1 - State Industrial Buffer Policy

In accordance with the recommendations of the Draft SPP No.4.1, the proposal seeks to implement a SCA surrounding the Dalyellup WWTP, to prevent the encroachment of uses, which might be affected by odour nuisance.

7.11.2 South West Growth Framework

The SWGF identifies the City of Sunbury as the regional centre for the South West region forecasting high rates of population growth and urban development for the city, and recommending it consolidate its position within the region as the focus of retail, commercial and industrial activity.

7.12 Operation of the Scheme

The impact of proposals for changes to the scheme text in terms of their effect upon procedures and the operation of the Scheme as a whole.

Adoption of the proposed SCA would require development proposals within the SCA to be referred to the Commission for determination, until such time that the relevant local authority amends its TPS for a corresponding SCA or equivalent mechanism.



8 The Amendment Process The Planning and Development Act 2005,allows for amendments to be processed as either "major" or "minor" amendments to the GBRS. It is recommended that this amendment be processed as a minor amendment for which the procedures set out in Section 57 of the Act:-

o formulation of the amendment by the WAPC;

o referral to the EPA for environmental assessment;

o completion of an Environmental Review (if required) in accordance with EPA instructions;

o public submissions being sought on the proposed amendment (including Environmental Review if required);

o consideration of submissions;

o approval, with or without any modifications in response to submissions, or refusal to approve, by the Minister; and

o the amendment takes legal effect with GazeUal of the Minister's approval.


GBRS Amt No.1 OXX/XX - seA No.4 - WWTP Odour Buffer Area Amendment Report - Version 1

9 Submissions on the Amendment {to be inserted following the completion of advertising the proposed amendment}

10 Hearings {to be inserted following the hearing of deputations}

11 Modifications to the Amendment {subject to modifications being made to the proposed amendment}

12 Final Outcome {to be inserted following the receipt of advice from the EPA}


consoCiJateJ Da[~e[[up Beacb Estate Loca[ Structure P [an Incorporating MopteJ MoJi~cations from Marcb 2003 to Ma~ 2008

S~VlCTVlR6 PLAN AR6A

N6ICjI-fSOVlRHOOD CONN6C roR.

DV\.Al. VlS6 PATH

D6V61.0PM6NTPLAN AR6A

~ DISPLAY VIl.LACj6

.- - - - AR6AS FOR FVlRTH6R • __ .;.1 INV6snCjAnON FOR 'VlR~AN'

LAND VlS6 opnONS

-CIF

l.OCAl. OP6N SPAC6

R6Cj10NAl. OP6N SPAC6

6XIsnNCj OR POSSI~1.6 FVlTVlR6 COMMVlNITY PVlRPOS6 R6S6RV6

WASTe WATeR

FIA.T1A.R.e 'tA,R.'&AN' LAND ~E" OPTIONS TO t-tAve 'IIO!.E"c;ARf> TO Dt:>Ol,.{R. '!.IA.FFE'R 'R.EQJ..t~'Mt"NTS

INDVlS~IAl.

WASTe

DISPOSAl.

nit: FOJU'SHOR.E.l?6S{;~VE; '&D1A.-..Jf')A"!y "tAS '!oEeN l'LACEt> IN ACCOlUlANce WITH THE ~6COMMeNt:lATIOt-l,c;~c;.~OIA.TON F(<::;L(R.E.S 3(") ANP3(b) OF Tl-lE: t:>.AI...YELL:.J,P 'f,6ACH 65iATE COASTAL. 'FC>R('S H OR'E MAN.A£1t"Mt'NT 'PL.ANPR.6'PAR.~ B-YATA ~NVIRONMeNTAL t)ATeD OCTO~6R.. .:(01)00.

CAR PARJU ---- + - ...; REiCR6AnON

MI""IML{M FOReSHOIi:\!.E S~ACK I... • ...,e --- -+--:

CAR PARK ----1----1

t...OCATlON OF COASTAL PA T1-t TO 'P-e t>6TCRMI Nfl'>-f----1 IN PETAII.. Eb COASTAL MANACo;EME"IT PLAN.

CAR PARK -----t-----1

t)EVGL-DPMENT Se-T1',ACK.ANt!> I.(.SE OF SFl'''PoACK. !I AIO:.E'A TO 'E.E n6T'6'R/"'INE'D IN ACCDfU)ANCE 'NIrH THe: SeCTION "" ..... 1 OF TH6 t:>A LY6ll tA,'P1t..!5.4C'-t ESTATe COASTAL. f"ORCSI+O'R£ MANAC;e:M'6NT Pt.A"" ANDo AS 'PAR.T OF TH6l"R.E'PAR.Ano~ OF AI-J OIA.TL 'I'l(; nrVI:LOPM6NTf1....AN FO~ THE" TOI.{R.LSM PREC.NCI .

I. U,..,n r...J ..... i ... wl within ""!I Resiaenrial De"';'!> eoJe it i • ..ruci,....J Catul NSlllrilC Le appro'CJcJ in a manncy Consistl"Ht wit& the lISt.! pentrittd in !6eResil •• ti.1 ZoIIe .J"",r.p_ will 6e su.ject '" tve a""rira.le R Col. ~Nirnmru 45 c:mttaiJwl witbi" the Residelftia l Design Codes "fwestent Awstra(i ...

2. . w;tbin the lanJ HcmriuttAasTOWfl CcntTc, Mixed Use FrcciHct, TouristPndna Qtul Loc4l Cmtres it is IUlticipawl tb4t 4K OwtiiHe D"""r..",...u pr... wirr ~ pr.lueeJ ID ~"tber re~ .. the laJ .... ,,,,,...,.!. anJ Ibat the audin, Deveropment l' r... ",ilr specif;g aHticipat.L>A CaJ NSe5 I1Ji..Jicale appropria te Jctn! lopment stankrJs.

3· NotwnbstanJingan)) otb .. provisions olrhe S<b<-ur!6e shire of ca".1 SiB'" JlNrli"8l' aJ Bifl Postin8' Locah.aws COIU!ciC ItIa)} ""prove. co .. prebensive ~ of siB'" .tsignd f., the .. IDle for the """""" of:

• Atlvertisingrh .. ale af"..".rt». • Jnforn,i. g the ""Mie ot",..".,eJ,.,.. furtf, •• ""r.".. •• '

'ntenJeJ lor particular sites. • To providc aircr.tion to 5O'tIices lid (lleilities. • I."""" ...... r.C featu ... of!6e site.

Om:e t1 com pre&ensivc system ofs;gnage is llJ'r1'f'fJul lIer sigtUl8'!s6aC£ COlt(o,.,... to tksign gu;JcHnes ami pnis&es set aut tbr.rehf.

4- Friar to approvar of any aemdopmeHt within areas i/errt;fjeJ liS tAlus For Purtber InvestigatiOH Por Urban Land Use Options', II: WlJ assess",'nt of th, laJ aJ ..... eiateJ pCans sbarr.e .. 6 .. itteJ (0, .pprov.1 b)J ~ of the sbi,. oIca".c anJ Wo.sterK AIIs!?Ci •• Pfmm;ngCmot .. issi ... sucb proposals shall 6e CONSil.,.J ... ,,,,,,jur,.,Jj~cati .. ' ID ax aNtli ... Develop""ntplanaJ.e su.ject to the reqtti ...... 1IIS afsuc,..cLnae 5.10.9 .fthe sbiro of capel To"", pr.nningsehe .... N O.7

s· Etrrth",orks a&sodll:teJ wit{, urban JctJcropment are II: penn.irwI NSe5ubject to

""""ri"""" with tf,e (o1lm.inglD the satisfa"ion af rhe sbi,. of capec: • p,.,..,rati ••• f aJ coml11ialt(' wirh. cf""ring aJ ti .. ~,Ji."...1

WIIU81J tnul site stabWS4ltioH and rwcgetatimt strateg:'IJ. • CoItIp4<ti .. Certi{icatim, shall ~ eo.{in,ICt{ b)J.,.".,....,., geoteeh.i",1 engin .... for .11 ,.arth",orkeJ ...... .

• A .uilJing Cicense shall .. 0614i'" (or .rr .... i.i.g ... r!.. .. Areas tD bc subiect to public open s1'ace kt'efopltttlftli"'1"f'OOnffe"t p'>.lf CI1 .. pC~ orith.,. overall program for the _le ",.i," ".,...nl .. f.rraJn.sisTtJle~ of(rH.i.Jh~ and ~ustlliHA {,re ttlA iH teHaffl:C.

6. Dtsig. pia., "ltiHgoKlfi";,6a .b.rr ..•• 6..ituJ IDgotJ,..with.n ...."la .. ti ... of u,< pla" "".t ofij" .re. 0' ..".I"""".t witl,i. th • ..,.,.11 ,.61;c.".. space Je.rJl!lopntr"tJimi6IJrtoQ ad maintenance strate&').

• PreparaoOft ,,'NIl cniorscmcnt of a detailed' forcs~ore rtUlna.gl"ftttHt works pla.1D ~ itn,I.....we",;tf, ~ aJj.urrt.tAg< .f ,.6Jivi.i ••• pri.,to unJertahiHg works that J"e4'Nin efttl'J iNto the proposeJ fOJ'('!.hore reserve to to (.reatc sustainablc (ew(a ... em-sire lHeetingwitb the sl,ire m({ t4ke p!ace to CO'N~nrt dea ring fines.

• stages of ", rt"",orks .JCeve!. wiCC .. ,.CateJ to •• """.rr r.v.r..J drainage , " aleg)1 far the " tate ID ~ co.~ ... eJ witf, tf,. sbire ,,"ur ID

COJtfttrel1celtJcnt of worf{S.

• Nt owralro"""",,,rlD .. >1h...,.ksi, .. tID ~CDJUtnleJas""!l(o .... f .. (,Jivi'; .. """",,,C ~at "",st~.6",;.eJ {nmt the WAPC.

7· s.6Jivisi ..• bo[[ .'ge"".rc" in awn'a..nce",;tf, tl,e ...Ja .... Dof»-CC.p lI""C~ Estate I.oc4C Structure plan.

11l0MPSON McROBERT EDGELOE 26 Wittenoom Str.eI, Bunbury WA 6230 Telephone: (08)97914411 Email: [email protected]

RSCj IO N A l. PA R K. (T,,~rt FQyest)

FVlTVlR6 VlR~AN

8. wit!iin !6e ..... oflaJ ..... i ... wlasR5 th.set6.cks{nmt 1ot&""..Jari .. for.CC , uilJinll' sb.rr~: Prmrt: ,,""i_wm 9'" wit(, .vi 4ver~ of 1.2,," Rear "m,i,"w," 9'" Sia. ".;,.; ..... 3" I~is wi[[ .CI"", .,.bicf .. <uss ID tl,e reA, of!6e ",..",rt»

..bi!., "",illt4ining ..... -cOlII& .. ti61e ..... f.r~,. protecti .. l. seconJar~ m.iNi ... "". 6 ... street

9· wit!,in the area aflaJ nOllli""wl RIO tf,.set6acks fro .. Cot lxt • ..Jario.s for.rr ' uilJin8' ,balC ~;" occm.1DtU witf, the Resiaential Design Col .. afWes"", Austra(ia. A Mt""JtfJfm (ptsjze o{l 300111 I. .,.,jfla""r"to (ou wleJR.lo attiND (.>1h ..... 6Jivi.i .. of ,.ci, em. • .;I! .e ""rrNittLJ.

10. A WatcrMaMgcHICl1t P~Uf to irrugrau approval of t.he KSt ofwRter witbnt public ."...,..,U de",lo",,,,.! shal! ~ preparea to the satisfaction of the sbi .. of caper prior to the JeVidopmcnt of aJJitirmar areas o(puf,(ic open spacc.

I I. Tbe "",";,.,. .. ,.all beisht (o, • .u..illi.gsi ....... cod,. lUo i, ~.7'"

PLAN OF MODIFICATION No. 1 Adopted pursuant to Delegation 210

CM Burwood Manager Planning and Development Services

Date: _____________ _

R.~SE1'!vt;

FIA.TV.;"!.E: LIA.Tl"f'e~N

c.OLLeqe

D"!AINACtE ~6SF.R.VE'

''' '£OI-t SCI-tOOL

f'IA.T:.{R.6 R6CR.eA TlON' SPORTS fACILmES

FICATlON No. 1 -Relocation of South Eastem Community purpose Site to Sherwood Drive

SCALE DATE

Al - I : 5000 29/07/08 A3 - I : 10000

~ay08-00277P-OI ~ PLAN No.

FIGURE 6

GBRS Amt No.1 OXXIXX - SCA No.4 - VWVTP Odour Buffer Area Amendment Report - Version 1


Water Corporation

Odour Modelling for

Bunbury WWTP and

Recommended Buffer Zone

September 2007

- ~EE

~ Consulting Environmental Engineers

Beenyup WWTP - Odour Monitoring and Modelling Table of Contents

1.

2.

3.

4.

5.

6.

7.

8.

Odour Modelling for Bunbury WWTP and Recommended Buffer Zone

Table of Contents

Scope of Work

Sunbury Wastewater Treatment Plant

Odour Emission Rates

Odour Objective

Wind Conditions

Odour Modelling

Odour Predictions

Recommended Suffer Zone

9. Conclusion

Appendix A EPA Green-light Criteria

Table of Figures

TOC-1

2

3

5

7

8

9

11

12

29

Figure 1 Existing Suffer Zone .................................................................................................... 13

Figure 2 Site Plan - Existing Sunbury WWTP .......................................................................... 14

Figure 3 Site Plan - Long term Plant ........................................................................................ 14

Figure 4 Wind Rose for Sunbury - 2003 to 2005 ................................................. ...... .............. 15

Figure 5 Wind Speed Frequency Distribution for Sunbury ...................................... ........ ......... 16

Figure 6 Wind Direction Frequency Distribution for Sunbury .......................................... ... ...... 16

Figure 7 Wind Rose for Sunbury - 2003 to 2005 - Day Hours ...................... ........... .............. 17

Figure 8 Wind Rose for Sunbury - 2003 to 2005 - Night Hours .............. ............................... 18

Figure 9 Wind Rose for Sunbury - Year 2003 .......................................................................... 19



Figure 12 Predicted Odour Contours for 9 MUd Sunbury WWTP with complaints ................. 22

Figure 13 Predicted Odour Contours for Existing Sunbury WWTP with Diffuser Failure and Survey Results ............................................................................................................ 23

Figure 14 Predicted Odour Contours for 15 MUd Sunbury WWTP ........................................... 24

Figure 15 Predicted Odour Contours for 35 MUd Sunbury WWTP (Low Odour from Aeration )25

Figure 16 Predicted Odour Contours for 35 MUd Sunbury WWTP (Measured Odour from Aeration) ...................................................... ................................................. ............... 26

Figure 17 Predicted Odour Contours for 35 MUd Sunbury WWTP with 15 % Odour Variation27

Figure 18 Recommended Suffer Zone for the Sunbury WWTP ................................................ 28

Figure A1 Predicted Odour Contours for Long term Plant 99.5 percentile 3 minute averaging30

Figure A2 Predicted Odour Contours for Long term Plant 99.9 percentile 3 minute averaging31

Consulting Environmental Engineers Version: 07-September 2007

Beenyup WWTP - Odour Monitoring and Modelling Table of Contents

Prepared by: CEE pty Ltd PO Box 201, First Floor, 90 Bridge Road, Richmond, Victoria

Version Prepared by Date Reviewed by

01 Ian Wallis 31 March 2007 Lisa Russ 02 Ian Wallis 30 April 2007 Lisa Russ 03 Ian Wallis 23 May 2007 Lisa Russ 04 Ian Wallis 22 June 2007 Lisa Russ 05 Ian Wallis 30 June 2007 Lisa Russ 06 Ian Wallis 20 August 2007 Lisa Russ 07 Ian Wallis 30 Sept 2007 Lisa Russ

Issued to: Water Corporation

Newcastle Street, Leederville, Perth, WA

TOC-2

Date

31 March 2007 30 April 2007 23 May 2007 22 June 2007 30 June 2007 20 August 2007 30 Sept 2007

This report constitutes the professional opinion and judgement of Consulting Environmental Engineers


Odour Modelling for Bunbury WWTP and Recommended Buffer Zone Page 1

1. Scope of Work

The Bunbury wastewater treatment plant (WWTP) is on the coast to the south of Bunbury and provides wastewater treatment for the City of Bunbury, as well as residential developments to the south (eg, Dalyellup). The plant is located in a depression in the sand dunes within an extensive area of land reserved for utilities, recreation and conservation. There is an existing buffer zone that extends for 1,000 m from the plant in most directions (shown in Figure 1), and 750 m to the south-east.

The Water Corporation installed a wind and meteorological monitoring station at the plant to measure onsite wind and dispersion patterns. Monitoring commenced in 2003 and three years of data are available to provide a good basis for modelling odour transport and dispersion. .

The existing treatment plant has a capacity of 9 MUd, and is now approaching capacity. The current treatment processes involve screening, primary sedimentation, secondary treatment (in trickling filters and sequential reactors) with polishing of the effluent in two large lagoons (surface area of 1.2 ha). The solids removed in treatment are digested, and either dried in sludge drying beds or dewatered directly using a belt press. The stabilised and dried sludge (biosolids) is available for use as a soil conditioner.

The plant is being expanded to a projected capacity of 15 MUd over the next two years. The long term capacity of the plant is expected to be 35 MUd (sufficient to treat wastewater from an estimated 170,000 persons), but the development plans and wastewater strategy for the Bunbury region are currently being reviewed.

A high quality effluent is produced, which is available for reuse. At present, the effluent is released to the ocean through an outfall that discharges 1.7 km from shore through a 120 m long diffuser on the seabed at 10 m depth. The outfall has a capacity of 24 MUd with the low level lagoons or 35 MUd without the lagoons.

The Water Corporation requested Consulting Environmental Engineers (CEE) to carry out odour modelling for the present and future wastewater treatment plant (WWTP) at Bunbury to assess the potential impact of odours from the plant and to define the buffer zone necessary to protect sensitive land uses from odour impacts.

The scope of work for this assignment was set out by the Water Corporation and involved the following tasks:

1. Develop estimates of odour emissions for the existing and future plant layouts as provided by the Water Corporation;

2. Review wind and dispersion conditions and develop files for modelling purposes to represent meteorological conditions at the site;

3. Establish an appropriate odour objective for the proposed WWTP, taking into account EPA odour impact assessment procedure (Guidance Statement No. 47);

4. Undertake Ausplume modelling of odour from the plant to predict odour contours; and

5. Advise on the location and size of the buffer zone based on this odour study and appropriate odour management measures.


~O~d~ou~r_M~o~d~el~lin~g~fu~r~B~un~b~u~~~~~~P~an~d~R~e~co~m~m~e~n~d~ed~B~u~ffi~er~Z~o~ne~ ________________ P~age2

2. Bunbury Wastewater Treatment Plant

The layout of the existing Bunbury WWTP, which forms the basis of the odour modelling, is shown in Figure 2. The existing plant comprises the following:

• Inlet channel; • Submerged drum screen; • Two primary sedimentation tanks (pre-treatment for the trickling filters); • Flow splitting tank; • Two trickling filters; • Two humus tanks (to remove solids from the trickling filters); • Sequencing batch reactor {divided into two by partitions, with each side having

an anoxic tank (bioselector) at the front followed, by intermittently aerated tanks; • Two anaerobic sludge digestion tanks; • One open secondary sludge digestion tank; • Sludge dewatering building containing a belt press; • Associated dewatered sludge storage building (mostly open); • Seventeen sludge drying beds with a total area of 0.6 ha; • Sludge and effluent pumping stations; and • Two large effluent polishing lagoons with an area of 1.2 ha.

Screened wastewater is divided into two parallel treatment processes - (1) primary treatment followed by trickling filtration and (2) intermittently decanted aeration. The existing treatment plant has a capacity of 9 MUd, and is now approaching capacity.

It is proposed to upgrade the Bunbury WWTP in several stages - the next stage is to upgrade to a 15 MUd plant. The long term plant capacity is expected to be 35 MUd which will be reached in about 2060. However, in response to the rapid growth in the region, the Water Corporation has commenced a review of wastewater requirements in the greater Bunbury region. The outcome may mean that an even larger plant will be needed in the long term.

The upgrade of the Bunbury WWTP to 15 MUd will involve the construction of a further sequencing batch reactor (divided into two by partitions, as with the existing sequencing batch reactor), to process the extra flow. The primary tanks and trickling filters will be decommissioned, as the stringent nitrogen limit for ocean discharge requires nutrient removal as part of the secondary treatment process.

There will be additional sludge thickening tanks and digesters to stabilise the sludge. The stabilised sludge will be dewatered by the belt filter press in the new solids handling building. The sludge drying beds will be decommissioned (with only one retained for emergency use). As the existing sludge beds are a large odour source, their decommissioning will mean that odour emissions from the 15 MUd plant wiil be less than from the current plant.

It is assumed that the long term 35 MUd plant will involve expansion of the treatment processes used in the 15 MUd upgrade, with provision of additional screens, grit tanks, more and larger bioselectors, sequencing batch reactors, sludge thickener, sludge digesters, and additional odour control works. Figure 3 shows the indicative layout for the long term 35 MUd plant.


--=O~d,-=-ou=.:.r...:.:M.:..:o,-=-de=.:.I...:.:lin:£g...:.:fo:..:...r-=-B-=-un-=-b-=-u~ry~WWT~-=-P--=an.:.:d--=-R.:.:e-=-co=.:.m:..:.:.m--=-e:..:..n:.::.de.:..:d:....:B.:..:u:..:.:.ff-=-er--=Z::..::o.:..:.ne=-----_______ ---=-P=age 3

The odour control works for the future expanded plants should include the following reasonable and practical measures:

• Covering the additional inlet area and channels; • Covering the additional screens, grit tanks; • Covering the additional bioselectors; • Covering and collecting odours from the sludge storage bins; • Collecting and scrubbing the odorous air from the covered areas, with discharge

through a 15 m high stack; and • Extracting and if necessary scrubbing the odorous air from the sludge

dewatering building before discharge to the atmosphere through a tall stack.

Should it be necessary to expand the plant above a capacity of 35 MUd, further odour control is expected to be required.

3. Odour Emission Rates

Odour emission rates were estimated for the existing 9 MUd plant, the future 15 MUd plant and the long term 35 MUd plant. The odour emission rates were based on odour emission measurements made at the existing Bunbury plant in 1997 and Woodman Point plant in 2003. The estimates of odour emissions from the Bunbury WWTP are summarised in Table 1. In addition, an estimate of odour emissions during the period of diffuser replacement in 2005-06 was made. Under these upset conditions, the odour emissions are estimated to be 124,200 Outs

Table 1. Odour Emission Rates from Existing and Proposed Treatment Plant

Bunbury WWTP 9 MUd 15MUd 35 MUd 35 MUd

Odour Inventory #1 #2

Preliminary treatment 2,650 6,240 800 800

Tanker receival 800 800 150 150

Primary sedimentation 7,920 - - -Trickling filters/humus tanks 4,510 - - -Bioselector tanks 5,720 11,440 4,000 4,000

Aeration tanks 7,510 15,050 28,750 39,780

Sludge digesters 5,770 12,100 15,650 15,650

DAF - - 1,350 1,350

Sludge drying beds 23,220 7,800 - -Supernatant pond - - 2,500 2,500

Sludge dewatering/biosolids 11,700 8,900 4,850 4,850

Total ground level sources 69,800 62,330 58,050 69,080

aUls per MUd of flow 7,800 4,100 1,600 2,000

Scrubber discharge from stack - - 12,000 12,000

TOTAL PLANT 69,800 62,330 70,050 81,080


Odour Modelling for Sunbury WWTP and Recommended Buffer Zone Page 4

As there is some uncertainty about the future design concepts and hence odour emission rates from the SBR tanks for the long term 35 MUd plant, an odour inventory for the odour long term 35 MUd plant has been developed for two sets of odour emission rates.

The lower emission rates (shown as #1 in Table 1) are based on 24 odour samples collected at the Woodman Point SBR by TOU in 2003, and analysed in a NATAaccredited laboratory. They showed odour emission rates, averaging 4.2 OU/m2/s. However, the Bunbury SBR tanks are more highly loaded than the Woodman Point plant, which has primary treatment before the SBR tanks.

The higher emission rates (shown as #2 in Table 1) are based on two odour samples from the aeration tank of the Bunbury WWTP collected in 1997 and analysed by the University of NSW. They showed relatively high odour emission rates, averaging 60U/m2/s.

As shown in Table 1, the total odour emissions at ground level from the future Bunbury plant at 35 MUd capacity are estimated to range from 58,050 OU/s, based on the lower odour emission rate, to 69,080 OU/s based on the higher odour emission rate.

The current odour emissions from the plant are estimated to be 69,080 OU/s. Thus, despite the almost four-fold increase in the plant capacity (from 9 MUd for the existing plant to 35 MUd for the long term plant) there will not be an increase in ground level odour emissions. This is because of the odour controls on the inlet area, preliminary treatment area, bioselectors and sludge processing area of the plant, and decommissioning of the more odorous processes (such as trickling filters and the sludge drying beds), which will offset the increase in odour from the larger number of aerated treatment units.

As a basis for comparison, with the projected lower odour emission rate, the total odour emissions from the 35 MUd Bunbury plant (with odour control) will be approximately 1,600 OU/s per MUd of flow, or 2,000 OU/s per MUd of flow with the higher emission rate. The unit emission rate of 1,600 to 2,000 OU/s per mL of flow from the future plant is comparable to other similar plants and is considered to represent a reasonable and cost effective level of odour control.


~O~d~ou_r_M_o_de_"_in~g_fu_r~B~un~b~u~~~~~P_a~n~d~R~~~o~. m~m~e~n~de~d~B~u~ffe~r~Z~o~ne~ ________________ P~age5

4. Odour Objective

In March 2002, the WA EPA issued a Guidance Statement on the Assessment of Odour Impacts (Guidance Statement No 47) to define odour objectives. This Guidance Statement was withdrawn for review in November 2005 and, in the interim, the EPA advises that the procedure noted below should be followed.

When assessing new proposals or expansions with the potential to cause odour impacts on existing sensitive land uses or when assessing new developments near existing odour sources, the EPA will use the following process: i) If generic buffer distances are met (as set out in EPA Guidance Statement No.

3 or in appropriate Codes of Practice or Statements of Planning Policy developed by the WA Planning Commission) and the proposed facility is designed for "best practice" emission control (EPA Guidance Statement No. 55), then no further assessment of odour is required.

ii) If a generic separation distance is not met, it may nevertheless be possible for the proponent to demonstrate acceptability by undertaking a conservative but relatively simple screening procedure which assesses odour impact against a two-part "green light" criterion, as follows: Computer modelling must be undertaken using either a measurement or reliable estimate of odour emission rate (in odour units per second, OUls) in order to demonstrate that the ambient odour concentration does not exceed the following two-part "green-light" criterion at existing or proposed odour sensitive premises:

A) 2 OU, 3 minute average, 99.5th percentile and B) 4 OU, 3 minute average, 99.9th percentile

If the above two-part criterion is met, no further assessment of odour is needed.

iii) Proposals which do not meet the two-part "green-light" criterion above will be assessed on a case-by-case basis, including a determination of the form of odour impact study required.

In 2005, the EPA issued Environmental Protection Guidance Statement No 3: Separation Distances Between Industrial and Sensitive Land Uses which recognises that wastewater treatment plants are a class of industry that require separation between the treatment plant and sensitive land uses, such as residential housing. Buffer distances are specified for sewage pumping stations, but EPA Guidance Statement No.3 does not specify separation distances for wastewater treatment plants. This report provides the buffer zone assessment for the Bunbury WWTP.

Based on the correlation of odour complaints and odour modelling around the existing Subiaco, Mandurah, Woodman Point and Beenyup WWTPs, the Water Corporation has ascertained that the 5 OU level of odour encompasses odour complaints from the urban community and also the zone in which odour can be perceived as a nuisance, when the 5 OU contour is calculated using the Ausplume model at 99.9 percentile frequency over a 60 minute averaging period.


~O~d~ou~r_M~o~d~el~lin~g~ro~r~B~u~n~bu~~~~~~P~a~n~d~R~e~co~m~m~e~n~d~ed~Bu~~~e~rZ~o~n~e ________________ ~P~age6

Thus the Corporation generally uses the 5 au contour and the 99.9 percentile odour frequency level for the assessment of the buffer zone needed to protect residents in urban zones from odour nuisance. The 99.9 percentile frequency is adopted by the Corporation (rather than 99.5 percentile frequency) as it provides a high level of protection to the urban community against odour nuisance. This percentile limit allows an exceedence of the odour limit for only 8 hours per year.

In summary, in this report, the extent of possible odour risk, and the recommended buffer zone for the Bunbury WWTP, are based on the 5 au contour at 99.9 percentile over a 60 minute averaging period.


_O_d_ou_r_M_o_de_lI_in=g_fu_r_B_un_b_u~~~ ___ P_a_n_d_R_e_co_m_m_e_n_de_d_B_u_ffe_r_Z_on_e __________________ P~age7

5. Wind Conditions

Wind and dispersion conditions for predicting odour levels in the area surrounding the Sunbury WWTP were based on wind and meteorological measurements at the site. The Water Corporation installed a wind and meteorological monitoring station at the Sunbury WWTP site and monitoring commenced in 2003. The monitoring site was selected to measure winds and air movement at and near the treatment plant site, while best meeting the Australian Standard for the location of wind monitoring stations.

The monitoring station is located on the east of the treatment plant site at the following location:

Grid Datum: Grid Reference:

Latitude: Longitude: Elevation:

GDA94 Zone - 50 Easting - 371,086 Northing - 6,305,076

33:23:09 South 115:36:50 East 25 m above sea level

The equipment installed at the monitoring station measures: • Wind speed and wind direction at 10m above the ground; • Air temperature at 2 m and 10 m above the ground; • Solar radiation; and • Sigma theta of wind direction variations.

Wind direction, wind speed and air temperature are recorded at 10 minute intervals.

The meteorological files were prepared from the wind, temperature and solar radiation measurements using the stability classification criteria published by the Victorian EPA (Plume Calculation Procedure, 1985).

Figure 4 shows the wind rose for the 3 year period, 1 September 2003 to 21 August 2006. The narrow bars (shown as black) near the centre of the wind rose represent the low speed winds (less than 1 m/s). The wider bars represent stronger winds, for example the wide red bars represent wind speeds from 3 to 6 m/s.

Longer bars on the wind rose indicate there is a high proportion of winds from that direction. It can be seen from the wind rose in Figure 4 that the dominant wind directions at Sunbury are from the south-east to east sector, and from the west sector.

Figures 5 and 6 show the cumUlative frequency distribution of wind speeds, and the frequency distribution of wind directions, respectively, over the three year monitoring period. The 10 percentile wind speed is 1.3 m/s; the 50 percentile wind speed is 2.9 m/s and the 90 percentile wind speed is 6.0 m/s. Sased on these results, wind speeds at Sunbury are slightly stronger than wind conditions experienced in Perth, perhaps reflecting conditions at an exposed site adjacent to the coast. The frequency distribution of wind directions confirms that winds at Sunbury come predominantly from the east and west.


Odour Modelling for Bunbury WWTP and Recommended Buffer Zone Page 8 ---------=------~----------------------------------------~

Figures 7 and 8 show the wind roses for the three year monitoring period for daylight hours and night time hours, respectively.

Figure 7 shows that during the day a high proportion of winds come from the west. Most wind speeds are in the range of 2 to 6 mIs, with few very light winds (less than 1 m/s) during the day.

At night, there is a higher proportion of light winds. More of the winds come the south-south-east, south-east or east. Strong winds at night mostly come from the west.

Figures 9, 10 and 11 show the wind roses for the years 2003, 2004 and 2005. The wind roses for the three years show a similar pattern, with the dominant winds coming from the west and east directions. Light winds come from all directions of the compass; however there are more light winds from the easterly sectors than from the west.

The wind roses for the period show a very small frequency of winds from the north, northeast and southwest. There are large sand dunes in these directions (relative to the location of the anemometer) and these may shelter the anemometer from winds from those directions. The effect of shadowing must be kept in mind in evaluating the predicted odour contours and determining the size of the buffer zone.

6. Odour Modelling

Odour modelling for this assessment has been carried out using the following procedure:

• Ausplume Model version 6.0 as issued by the Victorian EPA; • Odour emission rates as listed in Table 1; • Ground-following winds; • 60-minute averaging times and CEN odours, as defined by the WA EPA; • Three year meteorological file from measurements at the Bunbury plant; • WWTP geometry from plans of the site; and • Other model parameters (eg, roughness of 0.6 m) to best suit the Bunbury

WWTParea.

The odour model has been used to predict 99.9 percentile odour contours in the vicinity of the Bunbury WWTP. As explained above, the 99.9 percentile predictions represent the odour level that occurs or is exceeded 8 hours per year at each location.

In interpreting the results of odour modelling, it should be noted that the plumes from each source are assumed to travel in straight lines following the direction of the wind. In practice, winds will be influenced by the local topography of the dunes, with a slightly larger flow of air through valleys and saddles in the dunes, and a slightly smaller flow of air across the top of the larger dunes.


Odour Modelling for Sunbury WWTP and Recommended Buffer Zone Page 9 ---------=------~----------------------------------------~

7. Odour Predictions

Existing 9 MUd Plant

Figure 12 shows the predicted odour contours for the existing (9 MUd) Bunbury treatment plant under normal operations. The 5 OU contour extends out to existing residential areas south and south-east of the plant, and almost to the residential areas to the north-east of the plant.

As can be seen in Figure 12, under normal operating conditions, the 5 OU contour (and hence the expected extent of noticeable odour) is predicted to extend 1,200 m to the . north, 900 m to the east and 1,000 m to the south of the treatment plant boundary. The predicted 5 OU contour for the existing plant is close to the boundary of the existing buffer zone (shown in Figure 1). .

Only six odour complaints have been recorded from residential areas near to the Bunbury plant over the last six years. The coloured dots in Figure 12 show the location of odour complaints, some of which seem well away from the treatment plant. Complaints may result from several factors, including treatment plant operations, related events (such as carting biosolids from the plant), the operations of nearby pumping stations or the use of groundwater (which can produce a sulphide smell at times). Odour complaints are scattered widely across Bunbury with no concentration or increased frequency of complaints in the vicinity of the plant. Thus, although the plant (and particularly the sludge drying beds) are known to be odorous, it is difficult to correlate the complaints with typical operating conditions at the plant.

Upset Events

Each summer, the sludge drying beds are emptied and cleaned, and this event can create high odour emissions for short periods. The plant experienced a prolonged upset in the period from September 2005 to March 2006. During this period, one half of the sequencing batch reactor was out of operation and, as a result, there was additional load on the remaining reactor and the trickling filter. As a consequence, there was additional odour released from these processes. In addition, the sludge was not as well stabilised as normal, and there was additional odour from the solids processing areas. The odour emission rate is considered to have increased from 69,800 OU/s to about 124,2000U/s.

The odour contours in Figure 13 represent the predicted 99.9 % odour levels during the . period of the upset.

A phone survey of 105 nearby residents within 1.5 km of the plant was conducted in May 2006 Gust after the plant upset). The results of the phone survey, in terms of detecting odour (shown as a red dot in Figure 13) or not detecting odour (shown as a green dot in Figure 13) were plotted. A total of 22 per cent of the respondents said that they could detect odours, and the majority identified the treatment plant as the source of odours. The pattern of responses, with 'no odour' responses as close to the plant as 'detecting odour' responses, confirms the subjectiveness of odour experiences, but suggests that the plant probably is a source of odour nuisance during odour events.



Future 15 MUd Plant

Figure 14 shows the predicted odour contours for the planned upgrade to a 15 MUd plant. As noted above, the odorous primary treatment tanks, trickling filters and the sludge drying beds will be decommissioned.

It can be seen in Figure 14 that the predicted 5 au for the 15 MUd plant contour (solid line) will be within the existing buffer zone and the expanded plant is not expected to cause an odour nuisance to residential areas. Figure 14 also shows the predicted 5 au contour (dotted line) if the first stage of odour control is added at a later stage to the 15 MUd plant.

Long term 35 MUd Plant - Lower Odour from Aeration Tanks

Figure 15 shows the predicted odour contours for the long term 35 MUd Bunbury treatment plant and the lower odour emission rate. The predicted odour contours for the long term 35 MUd plant are similar in shape to the contours for the existing plant under normal operations but extend over a slightly smaller area. This demonstrates that it is feasible to increase the capacity of the plant with no net increase in odour emissions over existing levels.

Long term 35 MUd Plant - Higher Odour from Aeration Tanks

Figure 16 shows the predicted odour contours for the long term 35 MUd Bunbury treatment plant based on the higher odour emission rate. The predicted odour contours extend over much the same areas as for the existing plant, but with a four-fold increase in plant capacity.

Sensitivity Analysis

Figure 17 shows the zone in which the 5 au contour could be located with a ± 15 % variation in odour emission rates. This figure has been prepared because projected odour emission rates for the long term plant are subject to several unknown factors:

• The size of the catchment contributing to the long term plant and hence the travel time in the sewers for wastewater to reach the plant;

• The long term size and capacity of the plant; • The nature of the long term development, and particularly the extent of

commercial or industrial development; • Future water conservation practices and hence the possibility that wastewater in

the future will be more concentrated and hence more odorous; and • Possible more stringent odour requirements in the future.

In view of these uncertainties, and the situation that there is no alternative site for a wastewater treatment plant in Bunbury, it is appropriate to take a precautionary approach in defining the buffer zone. This involves making a reasonable but conservative assessment of future odour emissions as recommended by the DEC in "Air Quality and Air Pollution Modelling Guidelines, 2000".


Odour Modelling for Sunbury WWTP and Recommended Buffer Zone Page 11

8. Recommended Buffer Zone

Wastewater treatment plants receive and must treat all of the liquid wastes discharged by the community to the sewers. A modern wastewater treatment plant has several functions:

• Remove detritus and other solid and gritty objects from the wastewater; • Remove organic solids and convert them into useful products for reuse; • Remove dissolved constituents to meet water quality standards; • Remove nitrogen and phosphorus to meet environmental objectives; • Remove pathogens to protect public health; • Produce a reclaimed water stream for subsequent reuse; and • Control odours and noise, to minimise adverse environmental effects.

Even with good odour control technology and careful operation, there will be a base level of odour emissions and, at times, higher emissions as a result of the discharge of high contaminant loads to the sewers and/or plant upsets and planned maintenance. These events are anticipated in the management of the treatment plant and should be allowed for in land use planning.

An adequate buffer zone allows the residual odour emissions to dissipate without significant adverse effects on sensitive land uses beyond the buffer. The buffer zone is not, of course, an alternative to 'good practice' operation of a sewerage system, including responsible management of the sewage collection system, treatment processes, reuse operations and disposal systems.

Residential areas require higher standards of amenity than industrial or commercial operations and the separation of different land uses is achieved by buffer zones around land uses not compatible with residential areas. The consequences of an inadequate buffer zone are fourfold:

• Nuisance and hazard experienced by residents adjacent to the buffer zone; • Additional cost experienced to ratepayers for sewerage operations; • Additional energy consumption by the sewerage system; and • Community annoyance and land use conflicts.

Buffer zones are a practical and widely adopted solution to a real planning issue. For example, buffer zones are recognised for:

• Airports; • Petroleum and pharmaceutical manufacture; • Quarries and mining; • Animal feedlots; • Noxious industries; • Organic chemiCal industries; and • Water and wastewater treatment plants.

The recommended buffer zone takes into account the predicted distance to the 5 OU contour for the two odour plots for the long term 35 MUd plant and the green-light plots shown in Appendix A, the existing land use pattern and cadastral boundaries. The recommended buffer zone is shown in Figure 18, and also incorporates the residential exclusion zone for the chlorine storage at the Dalyellup water treatment plant.


Odour Modelling for Sunbury WWTP and Recommended Suffer Zone Page 12

9. Conclusion

The conclusions of the odour modelling study are as follows:

• The odour emissions from the existing Bunbury plant are estimated to be 69,800 au/s under normal operations. The plant is relatively odorous in comparison to other similar plants, and it is considered that odour control should be incorporated into future expansions of the plant.

• The ground level odour emissions for the interim 15 MUd plant with odour control measures are estimated to be 62,330 OU/s, which is slightly less than for the existing plant.

• The ground level odour emissions for the long term 35 MUd plant are estimated to be between 58,050 OU/s (based on the low emission rate) and 69,0800U/s (based on the high emission rate). The scrubber emissions are 12,000 OU/s, but these are discharged through a tall stack and have little influence on ground level concentrations. The projected odour emissions for the 35 MUd plant are slightly less than, or almost the same as, the existing 9 MUd plant. Thus it is feasible to increase the capacity of the plant with no increase in odour emissions.

• The proposed odour controls on the inlet area, preliminary treatment area and sludge processing area of the plant, and decommissioning of the more odorous processes (such as trickling filters and the sludge drying beds), will offset the increase in odour from the expansion of the plant to 35 MUd.

• The noticeable odour level is considered to be SOU, for a prediction based on 1-hour averaging and 99.9 percentile frequency. The buffer zone was defined using this odour criterion.

• The predicted 5 OU contour for the existing plant is close to the boundary of the existing buffer zone.

• The shape and location of the predicted 5 OU contour (at 1-hour averaging and 99.9 percentile frequency) for the long term 35 MUd plant is similar to the shape of the predicted 5 OU contour for the existing 9 MUd plant under normal operations, and covers a similar but smaller area.

• Based on these results, there is not a strong argument to change the boundary of the buffer zone, as it generally corresponds to the line of the existing and future 5 OU contour and does not extend over existing residential areas. Also, applying the precautionary principle is warranted because there is always a degree of uncertainty about the predictions of odour modelling for plants that are still to be designed, constructed and operated.

• Taking into account the results of the odour modelling, local topography, the local wind patterns and experience at other treatment plants, it may be that the buffer can be reduced a little to the south as shown in Figure 16.

• The recommended buffer zone extends 1,100 m north, 600 m east and 900 m south of the plant boundary. It covers much the same areas as the existing buffer zone. There are no residences within the recommended buffer zone.

• No residential, restaurant development, tourism development or other odour sensitive uses should be permitted inside the buffer zone but a range of recreational and conservation activities would be appropriate for the areas not within the Chlorine Public Exclusion Area.



Figure 1

N

® taD iOO 300 400 IMXJ , seAL.i or Os ' ,

Existing Buffer Zone

BUNBURY VVWTP EXISTING BUFFER


Page 13

Odour Modelling for Sunbury WWTP and Recommended Buffer Zone

Figure 2 Site Plan - Existing Sunbury WWTP

Figure 3 Site Plan - Long term Plant

I /

,----r_-"""r"-__ -_~_ ...... _, . .,r;.. T ',I '""'-C\

1 - "'0- 0'1' \,7Q...> -

r L --...., ''"'---''''''1'''' -~

I 1 + '- - I

I r-

l

Version: 07-September 2007

-- 0'" . =a-·_ .... ,r ~ .L. \'

.,.!. ~,/ oe

I; - r-/I

I ', r-----_.

,I , J..

~ ., .... -... -~--.... ,-"-'~ ..... ,

Consulting Environmental Engineers

Page 14


Figure 4 Wind Rose for Bunbury - 2003 to 2005

Station II 1· Bunbury • All years • All hours

0.00%

3-36 mJs

CEEPtyUd

Usa Russ

2910312007

........ y.

WindS .... d 01 .. 11:&11 IbI_a from,


WINO SPEED (mlsJ

o .· 15.0

• 9.0 - 15.0

• 6.0- 9.0

• 3.0 - 6.0 D 1.0-3.0

• 05-1.0 c.lmt: 0.00%

Page 15


100

90

80

70 1: ..

60 u

! ~ 50 r::

" 40 "" I! ... 30

20

10

0

10

9

8

7 1: .. u 6

! .- 5 u r::

" 4 "" I! ... 3

2

0

Figure 5

I

I

I

I I V 1/ i

I ,/

If I

o 2

Figure 6

i I I I I

I I

I I I

! I

I I I

I I I !

I i

I I

I Iii I

1 n I II

Wind Speed Frequency Distribution for Bunbury

I

/'

I V , )' i

Bunbury (2003 to 2005) Wind Speed Frequency

-~ I'-" !

V

I

I 10 percenlile - 1.3 m/s 50 percenlile = 2.9 m/s 90 percentile = 6.0 m/s

I Average = 3.4 mls

i I I

t--

t--I

V I I I I

3

I I !

I I I I

I I I I I I I

I I I I I

I I I 4 5 6 7 8 9 10 11 12 13 14 15

Wind speed, m/s

Wind Direction Frequency Distribution for Bunbury

I I I I I I I

I

I I

I I

I

:

I

Bunbury (2003 to 2005) Wind Direction Frequency

I i I ! I I I ! I

I

I I ! I I I I I

I I I I i I I I I I • I

I I I I i I I I

i ! I I I I I I

I I ! i I I I I I I ! i I I I i

I I I :

~ ~ I I II I II

I ! I I

I i I I I

! I I I

I I I I I I

I I I I

I I I I I

i I

I I

I I II

11 I II o ~ ~ ~ ~ ~ ~ ~ 0 ~ M v ~ ~ ~ ~ 0 ~ M V ~ ~ ~ m 0 ~ M v ~ w ~ m 0

~ ~ ~ v ~ ~ ~ m ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ N ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Wind direction, degrees


Odour Modelling for Sunbury WWTP and Recommended Suffer Zone

Figure 7 Wind Rose for Bunbury - 2003 to 2005 - Day Hours

Station II 1· Bunbury • All years· Day hours

CEEPtyUd

Usa Russ

0.00%

3.75""" 29I03I2007

DISPlA'<

Wind Speed Dlrectlonl..-olrom,

WINO SPEED (mls)

o .·'5.0

• 9.0-15.0

• 6.0- 9,0

• 3.0- 60 D 10- 3.0

• 0,5-1 .0 CaImo: 0 .1m!.

~~ .... E -,,~


Page 17


Figure 8 Wind Rose for Bunbury - 2003 to 2005 - Night Hours

WIND I\De P1.OT DISPlAY:

Station # 1· Bunbury • All years· Night hours Wind Speed Direction (blowing !rom)

CEEPtyUd

Usa Russ

0.00%

PftO&CTNO:

2.94m1s


WIND SPEED (mlo)

D >-15.0

• 9.0.15.0

• 6.0· 9.0

• 3.0· 6.0 D 1.0.3.0

• 0.5·1.0 Colma: 0.00'1\

Page 18


Figure 9 Wind Rose for Bunbury - Year 2003

ElISA,Ay;

Wind Speed D~.ctlon IbtowinG fIom)

Station' 1 - Bunbury - 2003 - All hours, WA

CEEPtyUd

Usa Russ

0.00%

I."" PftDJ!CT NO:

3.49m1s 29l03l2007


WIND SPEED (mls)

o .·150

• 9.0·15.0

• 8.0 · 9.0

• 3.0 · 8.0 o 1.0·3.0

• 0.5· 1.0 eo .... : 0.00'4

Page 19



Station # 1 - Bunbury - 2004 - All hours, WA

CEEPtyUd

Usa Russ

0.00%

3.45 mi. 29/0312007

DISPlAY'

Wind Speed Direction (b1c>winG froml

WIND SPEED (m/a)

o >-15.0

• 9.0-150

• 6,0- 9.0

• 3,0- 6.0 D 1,0-3,0

• 0,5-1,0 C8Imo: 0.00%

PftQ.I!CTNO.:

Consulting Environmental Engineers Version: 07 -September 2007

Page 20



WfrC) I\OS!: P' .. OT DePLAY:

Station II 1 - Bunbury - 2005 - All hours Wind Speed Direction (blowing from,

CEEPtyUd

lisa Russ

0_00%

AVG WN) IP!!D. """'""' NO.

l.45m1s 29/0312007


WIND SPEED (mi.)

>-15.0

• 9.0-15.0

• 6.0 - 9.0

• 3.0 - 6.0

D 1.0 - 3.0

• 0.5 - 1.0

Calma: 0.00%

Page 21


.-(J)

~ +-' Q)

E --0> C ~ t o Z

Figure 12 Predicted Odour Contours for 9 MUd Bunbury WWTP with complaints

Sunbury WWTP - 9 MLld

LEGEND

• OdcuCoqdolnt - 2fIIt

• Odcu~·20Q2 · -~.-

1

-775 225 1225 2225 3225

Conc. (Odour_Units); 99.9% avg.


Page 22

Odour Modell ing for Bunbury WWTP and Recommended Buffer Zone

Figure 13 Predicted Odour Contours for Existing Bunbury WWTP

......... C/)

~ ....... Q)

E '"-"

0> c ..c 1:: o Z

with Diffuser Failure and Survey Results

Sunbury WWTP - 9 MUd - Diffuser Failure

Cone. (Odour_Units); 99.9% avg.


Page 23


...-... (/)

~ +-' Q)

E '-'"

0> C ..c t o Z

Figure 14 Predicted Odour Contours for 15 MUd Bunbury WWTP

Bunbury WWTP - 15 MUd

~~~I ~~~mE_

-500 o 500 1000 1500 2000 2500 3000


- - - - - 5 OU contour with covers on inlet works and bioselectors

5 OU contour with NO covers on inlet works and bioselectors




0> C

.I::t::: o Z

-500


(Low Odour from Aeration)

Sunbury WWTP - 35 MUd

I I-~~

o 500 1000 1500 2000 2500 3000

Conc. (Odour_Un.its); 99.9% avg.




0> C ~ t o Z

-1 000 -500


(Measured Odour from Aeration)


o 500 1000 1500 2000 2500



Page 26

3000



0> C ~ -e o z

-500


with 15 % Odour Variation


o 500 1000 1500 .2000 2500



Page 27

3000


Figure 18 Recommended Buffer Zone for the Bunbury WWTP

••••• ~IDii81iCled BuIIIIIr

N

® 1DO 200 :sao 400 500

I I I I I

SCALE <:IF IElRES

BUNBURY WNTP Recommended Buffer


Page 28


Appendix A EPA Green-light Criteria

As noted in Section 4, the EPA has proposed two 'green-light' odour criteria for control of odour as follows :

Computer modelling must be undertaken using either a measurement or reliable estimate of odour emission rate (in odour units per second, aUls) in order to demonstrate that the ambient odour concentration does not exceed the following two-part "green-light" criterion at existing or proposed odour sensitive premises:

A) 2 au, 3 minute average, 99.5th percentile and B) 4 au, 3 minute average, 99. 9th percentile

If the above two-part criterion is met, no further assessment of odour is needed.

Figure A 1 shows that the predicted 2 au contour (3 minute averaging, 99.5 percentile) will be well within the existing and proposed buffer zones.

Figure A2. shows that the predicted 4 au contour (3 minute averaging, 99.9 percentile) would just extend to the existing residential areas to the north-east and south-east of the plant. There is a possibility of a minor exceedance adjacent to the coast to the south of the plant, but this is possibly an artefact of the dune topography adjacent to the wind monitoring site.

From the 'green-light' contours it can be concluded that: • The green-light contours do not extend to a significant degree over areas zoned

residential, and thus there is no need for further EPA assessment of odour; and • The green-light contours generally support the recommended buffer zone.



Figure A1 Predicted Odour Contours for Long term 35 MUd Bunbury Plant

C> c ..c t o Z

-500


99.5 percentile 3 minute averaging


o 500 1000 1500 2000 2500 3000


3 minute averaging



Figure A2 Predicted Odour Contours for Long term 35 MUd Sunbury Plant

------rn ~ ....... Q)

E "'-"

0> C

£ 1: o Z

-500


99.9 percentile 3 minute averaging


o 500 1000 1500 2000 2500 3000


3 minute averaging


INDIAN

OCEAN

1""1,,,,1 I I I I I I I

2

BUNBURY NO.2 WASTEWATER TREATMENT PLANT

100 0 100 200 300 400 500 600 700m

F 03 2010 E 02 2009 D 10 2002

C 08 2000

ODOUR BUFFER MODIFIED MODELLED BUFFER ADDED PLANSET FW99 ADDED TO DRG REF, PORTION OCEAN RD RENAMED MINNINUP RD BUFFER DISTANCE MODIFIED IN SE CORNER

ISSUE DATE GRID REVISION

DES CALC

DES CHD

DRN G. CLEAVER

DRG NO. REFERENCE WAWA 0001, OQ35, FW99 PDWDWA 50179

ENDORSED

RECOMMENDED 23/12/1998

for B BLAYDEN (SIGNED)

PRINCIPAL ENG. WW TREATMENT

APPROVED 23/12/1998

E J MURPHY (SIGNED) 18/12/98

C EllIOTT (SIGNED) ,.,., a.c. CHD MANAGER. re M FRENCH SOUTH WEST REGION MANAGER IDB, P8cD DNISION

GRC WB CAL RO DMO GC

GRC BMB MJF

DRN REC APPD

394 © THIS DRAWING IS THE PROPERlY OF THE WATER CORPORATION. IT SHALL NOT BE COPIED WITHOUT PERMISSION.

4

WASTEWATER TREATMENT PLANTS BUFFER DISTANCES SOUTH WEST REGION - BUNBURY WASTEWATER TREATMENT PLANT NO.2 FILE PLAN

PROJECT -

5

631!

DZ30-3-17

6

COORDINA TE SYSTEM: MGA 94-50

CAD ISSUE

ORIGINAL SHEET SIZE

A3 F MF

CAD WANAGEMENLNOT RfAI) ONL't\WW1\~ERAL\9JFfER\IIUNBURY NOO WWT'P\DZJ0-003-017-01F 15:53 24/03/2010 ~O/WS18173

A

8

c

D

Existing Zoning

Greater BunburY Region Scheme Shire of Capell City of Bunbury

~?f!!"--=-~""-"P.Tfi.7irnn:, ~;'~i!:;;,,!E::!;*!:! .. ~ft!~L!:I~tlrt:a'!T!tiiii

THE INFORMATION ON THIS PLAN 15 BASED ON THE BEST DATA AVAILABLE AT DATE OF PRINTING AND IS SUBJECT TO ONGOING REVIEW AND AMENDMENT. NO RESPONSIBILITY IS ACCEPTED BY THE WATER CORPORATION FOR ACCURACY OF' DATA SUPPLIED BY EXTERNAL AGENCIES.

'W.~T~,~ ® 100 0 ~oo 1000 ! I.! ! !

METRES

THIS PLAN IS THE PROPERTY OF THE WATER CORPORATION AND NO PART SHALL BE COPIED WITHOUT PERMISSION.

INOIAN OCEAN

LEGEND RESERVED LANDS

1---' PUBUC PURPOSE I :"1/ PUBLICUmlnES . __ 1

REGIONAL OPEN SPACE

ZONES

Proposed Zoning o 7"

OTHER

URBAN 1/7//1 SPECIAL CONTROL AREA NO.4 ~ WASTEWATER TREAlMENT PLANT OOOUR BUFFER AREA

List of Compatiblellncompatible Uses

Compatible Land Uses (Supported)

- Agroforestry - Industry - Motor vehicle repair

- Agriculture - extensive - Industry - extractive - Motor vehicle

- Agriculture - intensive - Industry - general (carwash)

- Animal establishment - Industry - mining - Plantation

- Animal husbandry - - Industry - rural - Public Open Space

intensive - Marine filling station - Storage (warehouse)

- Carpark - Motor vehicle, boat or - Telecommunications

- Fuel depot caravan sales - Public utilities

Odour Sensitive Land Uses (Not supported)

- Amusement parlour - Family day care - Night club

- Ancillary accommodation - Funeral parlour - Park home park

- Aged and dependent - Grouped dwelling - Office

person dwelling - Home occupation - Place of worship

- Bed & breakfast - Home business - Reception centre

- Betting agency - Fast food outlet - Recreation private

- Caravan park - Home office - Residential building

- Caretakers dwelling - Home store - Restaurant

- Childcare premises - Hospital - Restricted premises

- Cinema I theatre - Hotel - Rural pursuit

- Civic use - Industry - cottage - Rural residential

- Club premises - Industry - light - Service Station

- Consulting rooms - Industry - service - Single house

- Community purpose - Lunch bar - Shop

- Convenience store - Marina - Showroom

- Corrective institution - Market - Tavern

- Dwelling - Medical centre - Veterinary centre

- Education establishment - Motel - Winery

- Exhibition centre i _

Multiple dwelling

Where it is unclear as to which use class an application falls within, reference should be made to the definitions provided under Appendix 1 of the Model Scheme Text.

wash

.....

SUSTAINABILI T Y

Shortly after operations of the facility commenced, Cristal developed new technology that

improved recycling and efficiency, and cut residue production significantly. This has meant

the Dalyellup site can be used for an extra 3 years, without further excavation or increased

land area.

Cristal continues to research and develop improvements in operations to reduce energy and

water use, as well as reducing raw material consumption and waste.

LONG TERM PLAN

When the site is full, Cristal plans to vacate the site. Crista I will continue to work closely

with other bodies such as the Department of Environment and the Shire of Capel and the

local community on the final use and rehabilitation of the site once operations have been

completed. Crista I is proud of its expertise in the area of rehabilitation at Dalyellup and

during 1997 our company won an environmental awerd for dune rehabilitation at Dalyellup.

Part of the site has already been successfully rehabilitated to natural dunal bush with wildlife

repopulating the area. We have global experience in rehabilitation and are recognised

internationally for our rehabilitation projects. Cristal's Bunbury operations are certified to the

international standard for environmental management, ISO 14001. This means that we take

our environmental responsibility very seriously.

Based on community feedback an option for the development of a sporting complex is being

considered. The final use of the site will be based on consultation and government approvals.

MORE INFORMATION

Please contact us if you would like further information.

Crista I is proud of its safety and environmental achievements, as well as the

demonstrated commitment to being a responsible corporate citizen. If you

would like information on any aspect of our local operations, please contact us.

co~\nACTS

AUSTRALIND SITE

Lot 4 Old Coast Road, Australind WA 6233

Tel: 97 808 333 Fax: 97 808 555

Project Manager - Andy Males Tel: 9780 8433

OUR COMPANY

Millennium Inorganic Chemicals, a Crista I Global company (Cristal), is a well-known

company in the area, and produces titanium dioxide, an essential ingredient in the

manufacture of paint, paper, plastics and a wide variety of other household products. Cristal

operates two manufacturing sites, one at Kemerton and the other at Australind near Bunbury.

Cristal has a sales, marketing and warehouse facility at Henderson, near Fremantle, making

the company one of the largest employers in the region . Cristal has operated a licensed

residue disposal facility at Dalyellup, south of Bunbury since 1989.

RESIDUE DISPOSAL SITE

Much of what Cristal produces is recycled, and we are continuously exploring new ways to

recycle even more. There is, however, an amount produced from our process that is classed

as residue (waste product). The residue is fully treated and washed and then transported to

our residue disposal site at Dalyellup.

RESIDUE DISPOSAL

The residue disposed at the site is an inert non-hazardous clay-like material, made up mainly

of iron hydroxides. The residue contains low levels of naturally occurring radiation, originating

from the beach sands feedstock. Most importantly, this site is closely monitored and is

completely safe for the environment and the surrounding community.

L I CENSE AND M Ot~ITORING

Cristal operates under license issued by the Department of Environment & Conservation

(DEC). The license involves a number of Ministerial Conditions and the site's environmental

performance is reported annually to the DEC.

SITE LOCATION

The residue disposal site is situated in the dunes just to the north of the residential

development within the buffer zone of the Bunbury waste water treatment plant. In fact, many

residents may be unaware it even exists, as the operation does not impact the surrounding

community.

T RANSPO RT

The waste material is transported daily from our operations at Kemerton to Dalyellup, and

once within the Dalyellup community, we have restricted the trucks to a speed limit of 40km

per hour and to operating between 6am to 11 pm. The trucks visit the site approximately

seven times per day, and use the Harewood Road entrance from Bussell Highway.

greater bunbury region scheme amendment no. … · corporation greater bunbury region scheme...

Documents