Ontario · CSA Z768 & O.Reg. 153/04

Phase 1 Environmental Site Assessment in Durham Region

Ben Engineering offers Phase 1 Environmental Site Assessment (ESA) consulting in Durham Region, Ontario — backed by over 30 years of environmental consulting experience under the CSA Z768 Standard and O.Reg. 153/04.

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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: Durham Region, 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 Durham Region

Durham Region's industrial lands are distributed across Ajax, Whitby, Oshawa, and Pickering, with the largest concentrations near Highway 401 and the automotive-supply corridor anchored by Oshawa's GM plant.

Multi-Residential Development in Durham Region

Multi-residential development varies by municipality, with the densest clusters of apartment and condominium buildings found along the Highway 2/Kingston Road corridor and near each municipality's GO station. 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 Durham Region

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

Interviews are conducted with the current property owner or operator, and where possible with previous owners or long-term employees, to capture institutional knowledge of past spills, storage practices, or waste handling that may not appear in the written record.

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.