Site Decommissioning and Closure

Site Decommissioning and Closure must follow the issued project documents and the Ontario requirements applicable to the workplace, hazards, materials, and temporary or permanent works. We track dimensions, capacities, tolerances, test values, and acceptance criteria to their approved source, then collect field records that show what was installed, removed, tested, and shipped.

The principal compliance and specification framework includes O. Reg. 153/04 where environmental site condition work applies, O. Reg. 406/19 for excess soil, Regulation 347 for regulated waste, O. Reg. 213/91 for construction and demolition, OBC requirements, and municipal sewer and site alteration rules. We confirm which provisions apply to the project status and scope instead of mixing requirements from unrelated work types.

We check current issued-for-construction drawings, specifications, addenda, permits, utility information, and owner procedures before procurement or installation. Material certificates, concrete or grout tickets, equipment inspection records, calibration information, waste profiles, and test forms are collected as the work requires. A field change is not buried in a daily report. It is identified, reviewed, and recorded against the approved basis.

Ontario requirements depend on whether the location remains an industrial establishment or has become a construction project, and on the hazards actually present. We apply the project’s designated-substance information, confined-space assessment, demolition or shoring engineering, waste classification, excess-soil rules, and municipal discharge conditions as applicable. We never assume that an owner’s internal permit replaces the governing legal or engineering requirements.

Failures in site decommissioning and closure usually start with an unverified assumption, an out-of-sequence activity, or a missing interface control. We reduce that exposure by proving the condition that governs each step, holding the work when conditions differ, keeping temporary protection ahead of production, and recording direction before the affected method changes.

Service-specific failure modes include leaving an unrecorded service, incomplete tank or well closure, undocumented fill, cross-contaminating clean and affected soil, unapproved water discharge, poor final drainage, open foundations, or records that cannot demonstrate where material went. We place verification or inspection points immediately before the activities that could create those outcomes.

The first control is verification. We expose, trace, test, survey, sample, measure, or inspect the condition that controls the next step. The second is sequence. Temporary stability, isolation, drainage, access, and receiving capacity must stay ahead of production. The third is records. Daily quantities, test results, photographs, tickets, and approvals create an evidence trail that lets the project team resolve a variance while the facts are still visible.

Schedule failure usually comes from interfaces, not raw production. A crane cannot work without a verified pad, a vessel cannot be entered without an approved plan, a wall cannot be excavated below its support, and waste cannot leave without an accepted destination. Our look-ahead planning assigns each constraint an owner and required date, then confirms readiness before crews and major equipment are committed.