Associated Engineering; Halton Region

Halton Region Zone 4, and Washburn Feedermain Projects

Environmental Impact Studies, Permitting, and Hydrogeological Services in support of over 14 km of feedermain installation

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The Zone 4 Feedermain and Washburn projects involved the installation of approximately 15,000 m of trunk watermain. The watermain was designed to be installed by both open cut and trenchless methodologies with tunnel diameters ranging from 1800mm to 3500mm.

The study areas included complex hydrogeological conditions with confined aquifers located beneath major infrastructure (Hwy 401), fractured shale bedrock conditions, and adjacent sensitive ecological habitat and existing groundwater users. Working with AE throughout the design, many of the key issues were resolved prior to Tender through adjusting locations, depths, recommended construction methodologies, and by adapting mitigation strategies as part of the Tender process.

Associated Engineering; Halton Region
  • Hydrogeology
  • Aquatic Ecology
March 2015 — Ongoing

What We're Doing

Palmer completed environmental baseline studies and prepared an EIS for project design decisions and environmental permitting. Hydrogeological investigations in support of tunneling for installation of large diameter feedermains within both bedrock and unconsolidated sediments. Working with Associated Engineering and geotechnical sub-consultants, Palmer managed the installation and testing of monitoring wells, preparing hydrogeological reporting, and identifying tunnel constructability and permitting issues related to hydrogeological conditions or environmental constraints. This project also involved managing hydrogeological investigations in support of MTO and Metrolinx approvals for tunneling beneath the QEW, 401 and rail corridor.


Site-specific assessments using engineering and environmental methodologies to characterize the physical and chemical conditions of groundwater chemistry in support of design and permitting for clients in the mining, aggregate, land development and infrastructure sectors.

Aquatic Ecology

Industry-leading fisheries science consulting and aquatic services assisting in minimizing project effects on fish and complying with environmental legislation. Assessment of fish population dynamics, food web interactions, fish health and aquatic habitats amid human-induced impacts supporting monitoring, permitting and habitat compensation planning.