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 Controlling Odour and Corrosion in the Collection System: Region of Peel's Trunk Sewer Odour and Corrosion Control Master Plan Mark Andrews1*, P.Eng., ABSTRACT The Region of Peel (population 2.3 million, located west of Toronto, Canada) had multiple odour and corrosion problems in its collection system ranging from extensive areas of light damage to isolated pockets of severe corrosion. In an effort to be pro-active in solving its odour and corrosion problems, the Region of Peel commissioned a comprehensive odour and corrosion control strategy/master plan for its entire 155 mile (250 km) trunk collection system. The master plan not only addressed the current odour and corrosion issues but also focused on the preparation of design guidelines to ensure that future changes would help to protect the system from corrosion and would prevent odour issues as the system evolves and expands. The results of these efforts were used to create a Region wide odour and corrosion control master plan presented in terms of short-term and long-term capital improvement requirements. INTRODUCTION Odour and corrosion issues in the collection system have been addressed on an ad-hoc and reactive basis in many municipalities across North America. This approach is usually focused on a specific problem area and hence the recommended solution often lacks understanding of the overall corrosion context needed to properly address the problem. The Region of Peel on the other hand felt that a broad based, comprehensive solution to odour and corrosion control would be more effective. Hence the Region decided to develop a long term regional master plan to deal with odour and corrosion throughout the trunk collection system (see Figure 1). In 2006 the Region retained a consulting team to undertake the master plan project including comprehensive monitoring and pilot testing activities. The goal of the project was to develop short-term and long-term strategies to control odours and corrosion in the trunk collection system. Project objectives were:
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