Ontario · CSA Z768 & O.Reg. 153/04

Phase 1 Environmental Site Assessment in Markham

Ben Engineering offers Phase 1 Environmental Site Assessment (ESA) consulting in Markham, Ontario — conducted under the CSA Z768 Standard and Ontario Regulation O.Reg. 153/04, performed by licensed P.Eng. and P.Geo. professionals with over 30 years of experience.

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Standard: CSA Z768financing & 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 1 Environmental Site Assessment?

A Phase 1 ESA is a non-intrusive investigation to identify potential environmental contamination risks on a property. No soil sampling or laboratory testing is conducted at this stage.

See our Phase 2 ESA page for more. In Ontario, the CSA Standard applies to real estate due diligence and financing; O.Reg. 153/04 applies to rezoning, building permits, or filing a Record of Site Condition.

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

As with any Ontario municipality with an established industrial base, properties near Markham's commercial and industrial corridors are more likely to require a Phase 1 ESA when they change ownership, are refinanced, or are proposed for redevelopment to a more sensitive use such as residential.

How a Phase 1 ESA Is Actually Carried Out

In practice, the site reconnaissance is conducted by a qualified environmental professional who documents visible evidence of contamination, examines drainage patterns and surface staining, and notes the condition of any storage tanks, drums, or waste materials on site.

The historical records review typically draws on fire insurance plans, aerial photographs spanning several decades, and prior environmental reports where available, cross-referenced against the property's chain of title to identify past uses that might not be apparent from a site visit alone.

Environmental Site Assessment — Overview

Nearby areas we serve

Also servicing the surrounding region

Phase 1 ESAs by area

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