I\'m working on project and I need to design the DAL. I will be using Entity Framework for most of the project and Dapper for some performance-sensitiv
Check out an EF + Dapper Hybrid Implementation that Bradley Braithwaite has created.
GitHub Repo: https://github.com/bbraithwaite/HybridOrm
Accompanying Blog Post: ORMs: Don't Reinvent the Wheel
In terms of structuring the Project Layers to avoid "bleeding", here's how he did it.

From Blog Post: Creating Data Repository Using Dapper