What TPH concentration in soil indicates a release?

The significance of TPH, or Total Petroleum Hydrocarbons, concentration in soil is crucial for identifying potential contamination and assessing environmental risks. A TPH concentration above 50 ppm (parts per million) is commonly considered an indication of a release from a heating oil tank. This threshold reflects recognized standards and guidelines adopted by environmental regulatory bodies, which suggest that concentrations at or above this level can pose a risk to human health and the environment.

Understanding that levels below 50 ppm are often deemed acceptable or typical background concentrations can help reinforce why the 50 ppm mark is critical. It signifies a threshold where further investigation might be warranted to determine the source and potential impacts of contamination. Hence, recognizing that concentrations at or above this level necessitate further action or remediation efforts is vital for effective hazard management and ensuring compliance with environmental regulations.