Large-scale environmental projects are successful when they are issued on a turnkey basis. All project activities have to center around the technology or there is competing economic interest and no accountability.
Look for ways to eliminate cost by recycling and by designing a program where there is repetitive activity for all equipment.
Keep crew sizes at a minimum so you reduce HSE problems on site. Make sure all involved with the project are properly trained in HAZWOPPER.
Treat the project site like a hazardous material site and not a civil construction site. Although there are civil works the project is environmental.
On large scale projects scale back the project by sectioning off areas and utilizing the smaller areas as individual profit centers.