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Joe Beaman, a Raleigh geologist and president of Highlands Environmental Solutions, the company hired to manage the contamination cleanup at the Citrix site, says the costs and complexity of cleanup at a brownfield site depends on the severity of the contamination and types of chemicals found.
On July 26, 2016 the North Carolina Department of Environmental Quality UST Section announced that the State Action Levels for Total Petroleum Hydrocarbons (TPH) had been changed. The previous TPH Action Limits of 10 mg/kg for hydrocarbons in both the gasoline range (GRO) and the diesel range (DRO) have been increased to 50 mg/kg for GRO and 100 mg/kg for DRO, respectively. TPH is defined as the concentration of petroleum fuel constituents present as carbon chains in the range of C6 through C35.