Ontario · CSA Z769 & O.Reg. 153/04

Phase 2 Environmental Site Assessment in Thornhill

Ben Engineering offers Phase 2 Environmental Site Assessment (ESA) consulting in Thornhill, Ontario — backed by over 30 years of expertise, in compliance with CSA Z769 and O.Reg. 153/04.

Request a Quote See Phase 1 ESA

Standard: CSA Z769financing & due diligence
Regulation: O.Reg. 153/04RSC, rezoning, permits
Prepared by: Licensed P.Eng & P.Geo30+ years experience
Service area: Thornhill, ONand Southwestern Ontario

What is a Phase 2 Environmental Site Assessment?

A Phase 2 ESA is an intrusive investigation involving borehole drilling, soil and groundwater sampling, and laboratory analysis, typically conducted after a Phase 1 ESA identifies Recognized Environmental Conditions.

See our Phase 1 ESA overview for more. In Ontario, Phase 2 ESAs may follow CSA Z769 (financing, due diligence) or O.Reg. 153/04 (RSC filing, rezoning, MECP applications).

Industrial and Commercial Context in Thornhill

Thornhill has minimal industrial land, functioning primarily as a residential and commercial community split between the City of Vaughan and the City of Markham.

Multi-Residential Development in Thornhill

Yonge Street and Clark Avenue form the community's high-density spine, with numerous mid-rise and high-rise condominium and apartment buildings serving the dense surrounding population. Properties near these commercial and industrial corridors are the ones most likely to require environmental due diligence before financing, redevelopment, or a change of use.

Why This Matters for Properties in Thornhill

As with any Ontario municipality with an established industrial base, properties near Thornhill's commercial and industrial corridors are more likely to require a Phase 2 ESA when they change ownership, are refinanced, or are proposed for redevelopment to a more sensitive use such as residential.

How a Phase 2 ESA Is Actually Carried Out

Borehole locations are selected based on the Phase 1 findings, typically targeting areas of suspected historical spills, former tank locations, or drainage points where contaminants would be expected to accumulate.

Where groundwater is encountered, monitoring wells are installed to allow repeat sampling over time, since a single groundwater sample can be misleading if contaminant concentrations vary seasonally.

Environmental Site Assessment — Overview

Nearby areas we serve

Also servicing the surrounding region

Phase 2 ESAs by area

We work across Ontario, generally within 500 km of our Vaughan head office. Each area has its own page.