Construction of the collector extension
Customer: City of Brossard
Expertise: Analysis, plans and specifications, project management
Cost and Schedule: $7,000,000; from December 1999 to January 2002
Description: BPR’s mandate was to summarize the most pertinent points found in the history of the sewer and rainwater services in question, what the current status was, and how these services were operating. The Milan overflow facility was analyzed in detail, taking into account the good practices and expectations relating to performance that were in effect at the time of the construction (1985). Using references of different studies on the efficiency of this type of service, we attempted to adapt the entire system, taking into consideration the current North American practices that relate to sewer water. The project also related to identifying the characteristics, both qualitative and quantitative, of overflows and their impact on the downstream watercourse (Daigneault brook and Saint-Jacques river). All of the considerations presented were finally summarized in order to find solutions to the problem.
The project was divided into four parts: The inventory of fauna and flora in sectors C, J and L of the city of Brossard, the study of the problem revolving around the Matte collector and the Daigneault brook, technical assistance during hearings, and the construction of the Matte collector extension.
The City of Brossard had to undertake significant construction works relating to the Daigneault brook and the extension of the Matte collector to permit wastewater to drain properly, most notably from sectors C, L and J for which urbanization would intensify, on the short term. However, the problematics relating to the Matte collector and the Daigneault brook obstructed the development of sectors C, L and J in the city of Brossard. These two problematics were closely linked by the presence of a wastewater overflow system toward the Daigneault brook.
One of the objectives of this project was to very carefully examine, under the light of numerous documents consulted and analyzed (various reports, arbitrations, ordinances, engineering documents, etc.), the hydraulic and environmental issues of this controversy, while dealing with other economic and legal elements.
The environmental issues were investigated by reviewing the Daigneault brook’s environmental problems, including: updating the water quality data, a description of uses relating to aquatic fauna and human presence, the relationship between the sources of contamination and uses, technical recommendations for maintaining a minimum quality for water usage, and the establishment of health conditions that guarantee protection of human health.
Earth works were carried out during the months of April and May 1999 in order to meet the requests by the Ministère de l’Environnement, and the Développement durable et des Parcs relating to the presence of the striped chorus frog and the Mayapple (a rare plant) within the area studied, as well as the spring characterization of fish (ichthyofauna) in the Daigneault brook.