We had two goals: (1) keep dirty site water from draining off site and into the existing storm system; (2) allow access to the project for deliveries. Working together with the contractor, we decided that an asphalt berm alone wouldn’t provide enough protection and if installed thick enough to provide protection, wouldn’t allow for trucks to access the site. We also knew that Triangular Silt Dikes (TSDs) could be driven over but would tend to move if not secured to the existing asphalt. Solution: use both; TSDs to provide adequate protection from site discharges and the asphalt berm to secure the TSD flap to the existing asphalt. This worked well and required little maintenance.