Leaking UST Unsuspected

At the property owner’s request, PollardEnvironmental completed the closure by removing a 1,000-gallon underground heating oil tank at a residential property in the BlueRidge region of Virginia. Before excavation, we safely transferred the recoverable heating oil into a new above-ground storage tank, removed the remaining petroleum and sludge from the underground tank, rinsed the tank with water, and transported the tank for off-site disposal. We then excavated and removed the underground storage tank in accordance with Virginia Department of Environmental Quality requirements and applicable local codes.

Following removal, we discovered that the tank exhibited severe corrosion with multiple visible holes. Heavy petroleum staining was also present along the sides and bottom of the excavation at depths ranging from approximately 4.5 to 7 feet below grade. We collected soil samples to characterize site conditions and evaluate the extent of petroleum impact. In addition, we documented nearby environmental receptors, including groundwater, surface water, and adjacent structures.

Laboratory analysis confirmed elevateddiesel-range petroleum concentrations in the soil beneath the tank, indicating a petroleum release. Based on the investigation, we concluded that the remaining impacted soil represented a continuing potential source of groundwater contamination and documented recommendations for additional evaluation or removal of the affected soils.

After completing the tank closure, we restored the excavation with clean backfill and re-established the lawn. Following its review of the site characterization, the Virginia Department of Environmental Quality determined that no further investigation or corrective action was required at that time and formally closed
the case. The agency noted that future action could be required if significant environmental or health concerns develop.