After Remedial Action Topographic Survey

Challenge & Solution

A building in North Carolina was formerly used as a power substation from the 1930s until 1942, when the federal government purchased the facility. In the mid-1960s, the government converted the building into a maintenance facility.

In 1999, the building was demolished. Contaminants identified on the site included total petroleum hydrocarbons (TPH), polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), and pesticides. Prior removal actions were completed by 2008, when it was decided to institute Land Use Controls (LUCs) for the remainder of the contamination. A topographic survey was required to verify the remedial objectives had been met and to provide a basis for cut and fill calculations for the design of a new access road around the LUC area.

Project Description & Highlights

At the conclusion of all intrusive remediation actions, Rhea created the LUC document for the site. This LUC document was created to define remediation activity areas and document relevant details of the LUC area. Included within this task was the design of the relocated access road that currently passes through the LUC area.

A topographic survey of the existing ground surface confirmed that the soil cap remedial alternative covered the LUC area to the specified thickness, and provided the existing site grades and features that facilitated cut/fill calculations for the new access road design.

The topographic survey was instrumental in identifying a low-lying area that historically collected pools of runoff during storms. Evidence of previous erosion events at the former access road prompted the inclusion of appropriate stormwater drainage within the design to protect the new road.

The results of the topographic survey confirmed to the Client that the remedial action met the regulations of governing agencies. The survey also provided a basis for a cost-effective design and construction of the relocated access road. 


North Carolina