Soil Vapour Intrusion Mitigation

We start with vapour data, source chemistry, building use, slab condition, and consultant design. We also confirm access, utilities, operating restrictions, consultant responsibilities, notices, and the intended endpoint. Resolving these items before mobilization lets the field team establish controls, receiving routes, hold points, and contingency space instead of making compliance decisions beside an open excavation.

The main drivers are collection layer, sealed membrane, vent piping, monitoring points, and active fan if required. Weather, laboratory turnaround, inspection availability, and working hours can also control production. We build the sequence around the slowest approval or physical constraint and identify parallel tasks that continue without covering work, mixing materials, or compromising a required hold point.

The governing requirements depend on the material, property, equipment, and approval. The work can involve compatible cleaned seams, boots, liquid flashing, patches, and photographed inspection. We confirm the current project specific criteria with the engineer, Qualified Person, owner, municipality, or TSSA as applicable. A general industry practice never replaces the written requirement that governs the actual site.

Our field record includes field integrity testing and consultant inspection before reinforcement or concrete conceals work. Entries are tied to dates and work areas so quantities and events can be reconstructed. We reconcile documents during the job, not only at closeout, which gives the owner and consultant time to correct a missing ticket, unclear location, or inconsistent quantity before demobilization.

We use pressure measurements, fan and alarm checks, discharge verification, and monitoring taps. Work pauses until the condition is safe, isolated, and assigned a documented response. The supervisor records what changed, where it occurred, who provided direction, and how material or equipment was controlled, preventing an unexpected discovery from contaminating accepted work or disappearing from the record.

Yes, where the design permits it. We plan construction access control, protection layers, marked no drill zones, and repair procedure. The operating boundary, shutdown windows, truck route, emergency access, controls, and daily handback condition are agreed before work starts. Production is staged so facility staff and construction crews do not share uncontrolled access to the work zone.

Closeout should include source remediation lowers contamination, while mitigation controls the remaining building pathway. Depending on the project, it can also include photographs, surveys, receiving records, inspection releases, operating logs, test results, redline drawings, and a list of remaining assets. The package supports the owner's consultant and operations team, but professional certifications remain with the appropriately qualified person.