R.T. Orr Dam Geotechnical Investigations

The Upper Thames River Conservation Authority is soliciting proposals for geotechnical investigations and assessments of the R.T. Orr Dam located in Stratford, Ontario. The project, which initiates in 2026 and must be substantially completed by March 15, 2027, is based on recommendations from a 2023 Dam Safety Review by D.M. Wills Associates Limited. The scope of work includes reviewing existing structural data, conducting a detailed seepage investigation at the downstream left armour stone retaining wall, performing supplementary field investigations for embankment slope stability, installing two nested monitoring wells in both earth embankments, and updating stability analyses for armour stone structures. All work must adhere to the LRIA Technical Bulletin for Geotechnical Design and Factors of Safety and meet Ontario Accessibility Standards for electronic deliverables. Proposals must be submitted electronically via the bids and tenders platform by 3:00 PM Eastern Daylight Time on November 18, 2026. The selection process utilizes a two-envelope system where technical qualifications in Envelope A are evaluated before the cost proposal in Envelope B is opened. Award decisions are based on best value, considering experience, understanding of the work, proposed methodology, schedule, and cost reasonableness. Selected consultants must provide proof of professional licensing, WSIB standing, and required insurance policies, while maintaining strict confidentiality regarding project information.