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A Phase One assessment has four working parts. The records review asks what the property and its surroundings have been used for, drawing on the chain of title, fire insurance plans, aerial photographs, geological and well records, government permit and spill data and any earlier environmental reports. Ontario's guidance requires the qualified person to make all reasonable inquiries to obtain accessible information, and to look beyond the property itself: the phase one study area extends 250 metres from the property boundary, and further where that is justified.

The site reconnaissance is a physical attendance at the property to look for what records do not show: tanks, below-ground structures, stained soil, stressed vegetation, fill, drums, floor drains and discharge points. Interviews with owners, occupants and people who managed the site fill gaps and test what the records suggest. The qualified person then reviews and evaluates everything, and that evaluation is not a delegable formality.

The output is a report built around two ideas. A potentially contaminating activity is a listed use or activity, such as an industrial operation, a fuel outlet or dry cleaning, capable of introducing contaminants. An area of potential environmental concern is a place on the property where contaminants may therefore be present. The assessment also produces a conceptual site model that draws the site, its structures, the identified concerns and the surrounding uses together into one picture, and it concludes with a reasoned decision about whether a Phase Two assessment is needed.

A record of site condition is a document summarising the environmental condition of a property as of a certification date, based on assessments carried out by a qualified person. It is filed electronically to Ontario's Environmental Site Registry once the ministry confirms that its contents meet the regulatory requirements, and the certifications the qualified person makes during that submission cannot be handed to someone else.

Ontario sets out precisely who qualifies. To conduct and supervise environmental site assessments under Ontario Regulation 153/04 a person must hold a licence, limited licence or temporary licence under the Professional Engineers Act, or a certificate of registration under the Professional Geoscientists Act, 2000 while being a practising, temporary or limited member of the Association of Professional Geoscientists of Ontario. Independence is part of the test rather than an afterthought: neither the qualified person nor their employer may have any direct or indirect interest in the property being assessed, reported on or certified, and Ontario's brownfields guidance also expects qualified persons to carry professional insurance.

Two practical consequences follow. First, ask which named individual will act as qualified person and what they are licensed or registered under, rather than accepting a firm's general reputation. Second, if a consultant is also positioned to profit from the property in some other way, that is not a preference question but a disqualification question. Other provinces run their own contaminated-sites regimes with their own terminology, so confirm the rule that applies where your site is.

A Phase One assessment decides whether to investigate further; it does not test soil or groundwater. Ontario requires a Phase Two where certain industrial or commercial uses such as a garage, a bulk liquid dispensing facility or the operation of dry cleaning equipment are present or were present, subject to exceptions, and wherever the Phase One identifies a potentially contaminating activity that has created an area of potential environmental concern affecting the property. A Phase One that finds nothing is a legitimate result; a Phase One written to avoid triggering a Phase Two is a liability.

A Phase Two is a sampling programme. The qualified person prepares a sampling and analysis plan with quality assurance provisions, data quality objectives and standard operating procedures, then investigates soil, groundwater and where relevant sediment, delineating laterally and vertically the areas where contaminant concentrations exceed the applicable standards. Samples follow chain-of-custody procedures and are analysed by laboratories accredited to ISO/IEC 17025.

Risk assessment is the third path and it is often misunderstood. Where contaminant levels exceed the generic standards that apply to an intended use, an owner can remediate, or can pursue a risk assessment that scientifically examines the risk posed to human health, plants, wildlife and the natural environment and proposes property-specific standards offering equivalent protection, sometimes supported by engineering controls. That is a different specialism from routine assessment work, and not every firm that does Phase One assessments does it.

Contaminated land is mostly provincial territory. Records of site condition, site condition standards, brownfield rules and most approvals for operating facilities come from the provincial environment ministry, which is why a consultant fluent in one province's regime is not automatically fluent in another's.

Federal impact assessment is a separate track under the Impact Assessment Act, administered by the Impact Assessment Agency of Canada, and it applies to designated projects identified in the Physical Activities Regulations rather than to development generally. The process runs in five phases: planning, which begins when the proponent files an initial project description and can lead to tailored impact statement guidelines; the impact statement prepared by the proponent; the assessment itself, in which the Agency analyses impacts and drafts an impact assessment report; the decision, issued as a decision statement that can carry binding conditions; and post-decision follow-up and compliance monitoring. Documents are posted on the Canadian Impact Assessment Registry.

Two other federal threads catch projects that are not designated. Land owned or leased by the federal government, or where it has accepted responsibility for the contamination, falls under the federal contaminated sites programme and its inventory rather than the provincial regime. Separately, the Species at Risk Act protects species on its Schedule 1, assessed by COSEWIC, and a permit may be required to carry out an activity that could affect a listed species or its habitat. Establish early which of these apply, because they drive the schedule more than the fieldwork does.

A filed record of site condition describes a property as of a certification date. It is not a permanent clearance, and later work that disturbs soil, changes the use again or installs new below-ground infrastructure can reopen questions the record was never intended to answer. Keep the full report, the raw data and the conceptual site model, not only the summary page, because the next consultant will need them and reconstructing them later is expensive.

Operating sites carry continuing duties of their own: approvals with monitoring and reporting conditions, spill reporting obligations, and where a risk assessment produced property-specific standards, the engineering controls and restrictions that made it protective in the first place. Those controls only work if whoever manages the building knows they exist. Where a risk assessment or remediation underpins a site's status, brief the facilities team in writing and hand the obligations on with the property when it changes hands.

Phase One work is usually scoped as a defined investigation with a fixed deliverable, so the variables are the size and history of the property, how many records have to be chased and whether the study area is complicated by neighbours. Phase Two work is driven by the number of boreholes and monitoring wells, the analytical suite the laboratory runs and how far contamination has to be delineated, which is why nobody can scope it honestly before the Phase One is finished. Treat a Phase Two proposal offered before anyone has looked at the history as a sales document rather than a scope.

On LokalMatch you describe the property once, including its location, its current and intended use, what you know of its history and the deadline you are working to, and environmental consultants covering that area get in touch with you directly. LokalMatch does not carry out assessments, does not act as a qualified person and does not rank, screen or endorse the firms that respond; consultants pay for the requests they receive, which is what keeps the enquiry free for the owner or buyer making it. Ask each respondent which named individual would act as qualified person, and confirm their licence or registration yourself with the relevant regulator.