SumCo Eco-Contracting is a leading Northeast-based self-performing heavy / site / civil construction firm focused on ecologic ... al and environmental improvement projects. Our project leaders, scientists, engineers and crews partner with owners, A/E/C firms and other stakeholders to turn their project visions into reality. SumCo Eco has completed hundreds of projects across the Northeast. Specialties include: River Restoration | Dam Removal/Modifications | Sand Dunes and Beach Nourishment | Revetments and Seawalls | Freshwater Wetlands and Salt Marshes | Dredging (Mechanical) | Site Development | Park Construction | Culverts, Bridges and Boardwalks | Native Plantings and Seeding | Bioengineered Stabilization | Erosion Controls | Invasive Species Management | Landscapes Installation | UST Removal | Drainage Improvements | Stormwater BMP. read more