Ontario · CSA Z769 & O.Reg. 153/04

Phase 2 Environmental Site Assessment in Markham

Ben Engineering offers Phase 2 Environmental Site Assessment (ESA) consulting in Markham, Ontario — with investigations performed 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: Markham, 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 Markham

Markham's employment lands cluster along the Highway 7 corridor and in the Woodbine and Warden Avenue business parks, forming one of the largest concentrations of technology and advanced-manufacturing space in York Region.

Multi-Residential Development in Markham

High-density residential development is concentrated around the Unionville and Markham Centre nodes and along Highway 7, with numerous mid-rise and high-rise condominium buildings serving the city's tech-sector workforce. 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 Markham

The redevelopment pressure on Markham's older commercial and industrial land — a pattern seen across much of Ontario as municipalities intensify around transit and existing infrastructure — means environmental due diligence is an increasingly routine step in local development approvals.

How a Phase 2 ESA Is Actually Carried Out

Laboratory results are compared against the applicable Ministry of the Environment, Conservation and Parks site condition standards for the property's actual and intended use, and any exceedances are clearly flagged in the final report along with recommended next steps.

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.

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.