Mayfield Station Landowners Group Inc.

Feature-Based Water Budget (FBWB) and Hydrogeological Assessment

Wetland and Groundwater Level Monitoring and FBWB Modeling to support Urban Boundary Expansion, Draft Plan and Site Plan approvals

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Palmer Hydrogeologists were retained to address a key concern from Toronto and Region Conservation Authority (TRCA) and Credit Valley Conservation (CVC); will the Provincially significant Wetlands on the Mayfield West Phase 2 site be impacted by the proposed development and what mitigation measures should be implemented to maintain their function.

The assessment started with a detailed ecological, hydrological and hydrogeological characterization of the wetlands, and completing a long-term water level monitoring program to establish the unique hydroperiod of each wetland community. A FBWB and site wide water budget was completed under existing conditions, construction phase and post-development conditions to assess changes to the surface water and groundwater contribution to each feature. Wetland specific Low Impact Development (LID) measures were modeling and recommended for the project to maintain the hydroperiod of feature.

Mayfield Station Landowners Group Inc.
  • Hydrogeology
  • Terrestrial Ecology
May 2016 — Ongoing

What We're Doing

Following 3-years of monitoring Palmer completed a FBWB model that demonstrated our understanding of wetland function and provided specific LID measure recommendations to maintain the hydroperiod of each wetland community. This work supported the EIS/EIR Report for Draft Plan submission of the MW2-1 development (draft plan approved summer 2019). In 2019, Palmer completed a series of hydrogeological assessments to support an Urban Boundary Expansion through the Regional Official Plan Amendment (ROPA) process. These studies were documents are part of the CEISMP Part A, Part B and the future Part C reporting being completed by Hensel Design Group Inc. We are targeting at 2019 or early 2020 approval. Starting in August 2019, hydrogeologists from Palmer will be establishing a long-term wetland and groundwater level monitoring program as part of the Comprehensive Adaptive Monitoring Program (CAMP). This monitoring will ultimately be completed by TRCA/CVC based on the recommendations made by Palmer.


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.

Terrestrial Ecology

Multi-disciplinary investigation of terrestrial ecosystems at regional, local and site-specific scale. Analysis includes species interaction with the environment and relevant sensitivities to resource and land development, as well as identification of potentially sensitive terrestrial elements such as groundwater-dependent wetlands, species at risk and critical habitat which may influence project timing and agency approvals.