ARCADIS prepared closure construction plans and specifications detailing an engineered final soil cap and specific drainage control structures for the closing of the Marble Top Road Municipal Solid Waste Landfill. As part of this task, a soils investigation was conducted to locate material suitable for the landfill cap. During construction, the firm conducted tests as required by Georgia Environmental Protection Division (EPD) to certify the placement of the cap system. When substantial closure was completed, a Closure Certification Report was completed and submitted to EPD for their review and approval.

Upon closure of the landfill, the firm assisted the county in the design of an interim transfer station. This facility was used until a new facility could be permitted. The firm prepared the Design and Operation Plan for the new facility adjacent to the closed landfill.

The Knox Dolomite upon which the landfill is situated presented numerous challenges to the geologic team investigating the site. Localized mapping of a potential sinkhole depression using ground-penetrating radar was performed. A depression that was evident was excavated, plugged, and backfilled. The design and operation plan included a reinforced liner system and a leachate collapse detection system to alleviate any potential problems associated with depressions. During construction of the landfill care will be taken to keep stormwater from ponding on the site.

In response to the requirement by EPD to address contamination in one of the wells at the site, the firm conducted a fate and transport analysis using USEPA Bioscreen v 1.4, a one-dimensional, first order decay groundwater model. Based on the observed decreasing constituent concentrations and the indication that natural attenuation processes are actively degrading organic compounds within the groundwater, the firm recommended that actions be taken to complement the natural processes.