토론토시는 신규로 굴착된 강 어귀 배출구(outfall)에 대한 세부 설계 및 시공 관리 서비스를 제공하는 사업에 풀 서비스 컨설팅 엔지니어링 기업인 Hatch Mott MacDonald(HMM)을 공식적으로 선정했다.

배출구는 Ashbridges만 처리플랜트에서 처리된 폐수를 Ontario 호수까지 수송할 예정이며, 이전의 것을 교체해 시공이 끝난 후에는 하루 최대 1억4천만 갤런의 폐수 수송량을 보유하며 캐나다에서 가장 큰 규모의 폐수 배출구가 될 것으로 기대된다. 또한 이 프로젝트는 호수 바닥 아래 암석에 3천500m 길이, 4m 폭의 터널을 채굴하는 것을 필요로 한다.

 

 

 

The City of Toronto has officially selected Hatch Mott MacDonald (HMM), a full-service consulting engineering firm, to provide detailed design and construction administration services for a new tunneled outfall that will convey treated effluent from its Ashbridges Bay Treatment Plant into Lake Ontario.

 

The new outfall will be built to replace an older outfall and will be the largest wastewater outfall in Canada, conveying up to 1,040 million gallons per day (3,920 million liters per day). Further, the project will require the mining of a tunnel 2.2 miles (3,500 meters) long and 23 feet (7 meters) in internal diameter through rock beneath the lakebed.

 

The project also includes a drop shaft, a connection to lakebed risers constructed by barge from the lake above, and land-based plant connections. The design and investigations phase of the project work is planned through the end of 2017, with construction starting in the first quarter of 2018 and likely extending to the end of 2022.

 

"The Ashbridges outfall project will draw on HMM's strengths in tunneling and in wastewater treatment," said Michael Schatz, HMM's Managing Director for Canada. "We are proud to have won several awards for our work on the Keswick Effluent Outfall in Lake Simcoe and we will bring the same care and expertise to this new challenge."

 

[출처 = Water World  /2015년 10월 19일]