Ontario · CSA Z769 & O.Reg. 153/04

Phase 2 Environmental Site Assessment in York Region

Ben Engineering offers Phase 2 Environmental Site Assessment (ESA) consulting in York Region, Ontario — with intrusive sampling and laboratory analysis under 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: York Region, 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 York Region

York Region's employment lands are distributed across Vaughan, Markham, and Richmond Hill, with concentrations along the Highway 400, 404, and 407 corridors.

Multi-Residential Development in York Region

High-density residential development across the region is concentrated in the Vaughan Metropolitan Centre, Markham Centre, and the Yonge Street corridor through Richmond Hill and Thornhill. 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 York Region

As with any Ontario municipality with an established industrial base, properties near York Region'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.

Soil samples are collected at multiple depths from each borehole and screened in the field before being sent to an accredited laboratory, allowing the assessor to prioritize which samples warrant full laboratory analysis.

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.