Landfill, Earthwork & Erosion Control

As one component of SES's environmental construction capabilities, our work at landfills includes:

  • Design and permitting
  • Repair, capping and maintenance
  • Closure plans
  • Investigation of contaminant migration
  • Gas sampling
  • Development oversight

The cap is one of the most important aspects of a closed landfill - caps must be maintained to prevent erosion and stormwater ponding leading to leaching and migration of contaminants. SES can prevent these problems by:

  • Installing lined drainage channels
  • Routing surface water and subsurface groundwater away from the landfill
  • Grading the surface to eliminate depressions and provide positive drainage
  • Developing and maintaining a protective cover of vegetation
SES also performs quality earthwork and erosion control while engaged in other construction activities including:

  • Excavation and removal of contaminated soils
  • Slurry wall construction
  • Sediment basin construction
  • Dredging
  • Slope stabilization
  • Riverbank restoration
  • Drainage channel construction
  • Backfilling and grading

SES uses both structural and biological methods for erosion control along river or streambanks: structural measures include rock riprap, interlocking concrete blocks, gabions, geosynthetics, or formed concrete; and vegetative or biological measures include log bundles anchored to the stream bank, coir fabric, and planting native grasses and shrubs that can form a protective net within the topsoil.

Featured Projects

SES repaired and made improvements to the passive methane gas collection system and clay cap. Over 3,500 cubic yards of topsoil were added and re-graded to cover low spots and provide positive drainage, one gas vent was installed in the gas collection media three feet under the landfill cap, and disturbec areas of the landfill were hydroseeded to encourage vegetation growth.

SLURRY WALL CONSTRUCTION - Savannah National Wildlife Refuge, Georgia
As one component of a $3.76 million project to rehabilitate the existing freshwater control system of the Savannah National Wildlife Refuge, SES raised a canal levee and installed a 750 foot long slurry wall, to a depth of 12 feet below finished grade, along a settled length of the levee to minimize leakage into an adjacent property.

Contaminated soil removal - Kennedy Space Center, Florida
Over 10,000 cubic yards of petroleum and PCB-contaminated soils were removed from two sites that were crowded with utilities. Remedial activities took place without impacting the Space Shuttle Program's schedule or adjacent buildings.

SES built bock check dams at a new channel site that was fine-graded to establish a riggle/glide/log and a boulder structure/scour hole. Mechantable timber was harvested during the channel and floodplain creation and the old channel was backfilled and replanted.