GTA’s personnel have assisted clients in more than 20 landfill projects. Our successes include cost, schedule, and liability reduction for Subtitle C and D landfills. GTA is experienced in full-service support, and offering assistance from the preliminary phases of project scoping through permitting, construction, operation, closure, and post-closure care.
Our capabilities include the following:
- Site evaluation
- Feasibility analysis
- Liner cell and cap design
- Leachate collection and system design
- Hydrogeologic assessments
- Industrial and solid waste landfill design
- Construction phase testing
- Seismic stability analysis
- Operation assistance/observation
- Closure/post-closure care
- Land reclamation/beneficial use
- Landfill gas monitoring/mitigation
- Remediation of landfill environments
- Surface water
- Soil vapor
Rubble Landfill Closure, Spencer’s East Site, Harford County, MD
GTA provided construction observation and testing services during the closure of the rubble landfill. Services included observing the removal of unsuitable or failing cover soil areas and placement of new controlled fill for the cap, access roads, drainage easements, and stormwater management facilities.
Salem County Landfill, Cell #9 Expansion, Salem County, NJ
The Salem County Landfill was nearing its capacity when the Salem County Improvement Authority approved the an expansion plan. The expansion plan consists of five new cells adding over 31 acres to the previous seven cell landfill. GTA worked with R.E. Pierson Construction Company to provide construction oversight and quality control for the eighth (2012) and ninth (2014) cells. GTA observed the placement of structural fill for the haul roads, SWM basin berms, perimeter and intermediate cells and cell bottoms. GTA observed foundation construction for the leachate pump house included bearing capacity evaluations and sampling of the concrete. Prior to construction, GTA performed compliance testing for the clay materials and leachate sands which included moisture density relationship, relative density, grain size analysis, and flex wall permeabilities for materials used in construction.
Harford Waste Disposal Center, Harford County, MD
Cell N-1 – GTA performed the QC Observation and testing services during grading of a 12+ acre, solid waste municipal landfill cell. Services included field density testing, sample collection and laboratory testing for classification, moisture-density, and permeability, and in situ field infiltration testing consisting of double ring infiltrometers. Laboratory testing services included index testing, direct shear, and permeability of the soils used during liner construction and general fill operations.
Cell N2 – GTA performed a geotechnical exploration and provided recommendations to facilitate the design of the referenced landfill 12+ acre cell. Services included SPT borings, geophysical transects, laboratory testing of soils, to evaluate the subsurface conditions and map the rock surface elevations. During construction, GTA provided services as the full-time resident project representative (RPR) to observe that construction was being performed in accordance with the plans and specifications, and the find resolution as problems arose.
Cells A-J – GTA performed a geotechnical exploration and provided recommendations to facilitate the design of the closure of the referenced landfill cells. Services included test pit explorations to map the limits of the existing cells and associated liner, and to provide recommendations for the design and construction of a new access road. Services also included the design of a reinforced soil slope and new access road along the limits of the cells. During construction, GTA provided services as the full-time resident project representative (RPR) to observe that construction was being performed in accordance with the plans and specifications, and the find resolution as problems arose.
Honeygo Run Reclamation Center, Baltimore County, MD
GTA provided geotechnical services to evaluate the subsurface soil and groundwater conditions to facilitate the design of several rubble landfills at Honeygo Run Reclamation Center in White Marsh, Maryland. GTA also provided observation and testing services during construction. Services included field and laboratory testing of the embankment fill material, clay liner, stone drainage layer, and the high density polyethylene (HDPE) liner, well abandonment, foundation and steel inspection, and concrete testing.
GTA provided drilling for five observation wells to depths approaching 125 lf using mud rotary method and well development. Work also included well abandonment of residential wells approaching 325 lf in depth.