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reportOdour Buffer Distances for Ballarat North, Ballarat South and Cardigan Village WWTPs

3552322/100 Rev 1 R1:62014

reportOdour Buffer Distances for Ballarat North, Ballarat South and Cardigan Village WWTPs

Prepared for

Ballarat City Council

By

Beca Pty Ltd

ABN: 85 004 974 341

January 2007

Ballarat WWTP Odour Buffer Distances

3552322/100 Beca Page i R1:62014-TJF65R04 - Rev 1.DOC Rev 1 23 January 2007

Table of Contents

1 Introduction ................................................................................................ 11.1 Overview ..........................................................................................................11.2 Information Sources ........................................................................................2

2 EPA Victoria Regulations for Odour Design Criteria and Buffer Distances.......................................................................................... 32.1 Introduction .....................................................................................................32.2 SEPPs .................................................................................................................32.3 Odour Design Criteria in the SEPP (AQM).....................................................42.4 Buffer Distances ...............................................................................................4

3 Location and Description of Sites............................................................. 73.1 Cardigan Village WWTP .................................................................................73.2 Ballarat North WWTP .....................................................................................103.3 Ballarat South WWTP .....................................................................................15

4 Meteorology............................................................................................. 214.1 Ballarat Airport Meteorology .......................................................................214.2 Meteorological Data File for Dispersion Model .........................................22

5 Description of Odour Sources and Estimate of Odour Emission Rates .......................................................................................... 235.1 Cardigan Village WWTP ...............................................................................235.2 Ballarat North WWTP .....................................................................................255.3 Ballarat South WWTP .....................................................................................27

6 Approach Used to Define Buffer Distances ........................................... 316.1 Overview ........................................................................................................316.2 Modelling Criteria..........................................................................................316.3 Dispersion Model Methodology ..................................................................33

7 Cardigan WWTP Dispersion Model Results and Odour Buffer Distances .................................................................................................. 347.1 Model Results : Scenarios C1, C2 and C3 Cardigan Village

WWTP normal operation...............................................................................347.2 Model Results: Scenario C4 Cardigan Village WWTP upset

operation future loading..............................................................................387.3 Discussion of results and odour buffer distance

recommendation..........................................................................................40

8 Ballarat North WWTP Dispersion Model Results and Odour Buffer Distances........................................................................................ 44

Ballarat WWTP Odour Buffer Distances

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8.1 Model Results: Scenario N1 Normal Operation GHD SOERs.....................448.2 Model Results: Scenario N3 Normal Operation Beca SOERs....................488.3 Model Results: Scenario N2 Ballarat North WWTP upset

operation GHD SOERs...................................................................................518.4 Model Results: Scenario N4 Ballarat North WWTP upset

operation Beca SOERs..................................................................................548.5 Discussion of results and odour buffer distance

recommendation for Ballarat North WWTP ................................................57

9 Ballarat South WWTP Dispersion Model Results and Odour Buffer Distances........................................................................................ 629.1 Model Results: Scenario S1 Current Layout Normal Operation ...............629.2 Model Results: Scenario S2 Future Layout Normal Operation..................669.3 Model Results: Scenario S3 Ballarat South WWTP upset

operation current layout ..............................................................................679.4 Model Results: Scenario S4 Ballarat South WWTP upset

operation future layout ................................................................................719.5 Discussion of results and odour buffer distance

recommendation for Ballarat South WWTP................................................73

10 Planning Scheme Implementation Options .......................................... 7710.1 Current Situation............................................................................................7710.2 Options for Improvement .............................................................................79

11 Community Information Sessions ........................................................... 8111.1 Background ...................................................................................................8111.2 Cardigan Village...........................................................................................8111.3 Ballarat North.................................................................................................8211.4 Ballarat South.................................................................................................83

12 Conclusions .............................................................................................. 84

13 Recommendations .................................................................................. 86

14 References................................................................................................ 87

Ballarat WWTP Odour Buffer Distances

3552322/100 Beca Page 1 R1:62014-TJF65R04 - Rev 1.DOC Rev 1 23 January 2007

1 Introduction

1.1 Overview Wastewater treatment plants (WWTPs) are critical infrastructure for any modern city. They have historically, by virtue of odour and perception impacts, been located away from residential areas, and have been provided with buffer zones more related to distance than specific odour modelling and odour mitigation strategies.

The City of Ballarat (COB) is seeking to establish suitable odour buffers around three Central Highlands Water (CHW) facilities for Ballarat. These are the Ballarat North WWTP, the Ballarat South WWTP, and the Cardigan Village WWTP. The locations of these three WWTPs are shown in Figure 1.1.

This report provides the results of dispersion modelling of odour emissions from the three WWTPs, and provides recommendations for location and size of odour buffer zones.

In determining buffer distances it is important to look to the future and anticipate any upgrades for additional capacity or increased effluent or biosolids treatment. Beca has been able to provide a preliminary assessment of these issues, however the Ballarat North WWTP is soon to undergo a major upgrade. Details of the likely treatment processes could not be released by CHW for reasons of confidentiality related to negotiations with the upgrade preferred contractor. Therefore, for the Ballarat North WWTP the dispersion model is based upon the current WWTP layout.

C ardigan Village WWT P

B allarat N orth WWT P

B allarat S outh WWT P

A irport

Figure 1.1: Location of the three WWTP sites in the odour buffer distance study.

Ballarat WWTP Odour Buffer Distances

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1.2 Information Sources The dispersion model input data for the Ballarat North WWTP and Cardigan Village WWTP were based on information provided by CHW, site visits which did not include entering the premises, and aerial photos. For the Ballarat South WWTP, this information was supplemented by a site visit and tour of the Ballarat South WWTP on 3rd May 2006, and site drawings provided during the tour.

Specifically, documented information provided by CHW was as follows:

Extracts from internal CHW document concerning Ballarat's wastewater treatment plants entitled Water Supply and Wastewater Service: System Summaries (October 2005). It is understood that the information contained in this document is used primarily to update CHW Board members on CHW water supply and wastewater treatment systems and is not normally released publicly. Accordingly, only the sections of the document considered relevant to this study were released by CHW.

GHD report for CHW dated April 2004 entitled Odour Emission Rate Surveys and Assessment of Appropriate Buffer Distance for Ballarat North WWTP, Final