What is @Coffey Geotechnics?

Coffey Geotechnics Inc. (Coffey) was retained by the Regional Municipalities of Durham and York (the Regions) to carry out a geotechnical investigation and to prepare a geotechnical report for a new potential Duffin Creek Water Pollution Control Plant (WPCP) Outfall.

What was the Canadian Geotechnical Journal Volume 18?

Canadian Geotechnical Journal, Volume 18, 1981 [9] Lo, K.Y. and Lukajic, Boro. Predicted and measured stresses and displacements around the Darlington Intake Tunnel. [10] Groundwater Resources of the Duffin Creek – Rouge River Drainage Basins.

What is the purpose of the geotechnical investigation?

The purpose of the geotechnical investigation is to characterize the lake bottom soil and bedrock conditions and to provide geotechnical input for the environmental assessment (EA) and preliminary design stages of the outfall. Investigation of the land portion of the project (e.g. potential shaft) was not part of the assignment.

What is the geotechnical evidence for the outfall pipe alignment?

Both, the geotechnical investigation and the geophysical survey established that throughout a significant length of the proposed outfall pipe alignment the surface of the bedrock is overlain by overburden soil deposits.