BIOX conducted in-situ remediation services for the redevelopment of a former printing facility. The environmental consultant identified petroleum-stained soils in the vicinity of two on-site abandoned-in-place USTs that formerly contained heating oil. Total petroleum hydrocarbons (TPH) were identified at levels above soil attenuation capacity. Thus, remediation was necessary to reduce the concentrations of TPH. Because the area of impacted soil was located underneath the building and adjacent to the building foundation, the abandoned USTs could not be removed to allow access to the soils. The property owner elected to conduct in-situ bioremediation with the BIOX® Process.

The treatment zone consisted of an irregularly shaped area of approximately 2,856 square feet and extended to 12 feet below surface grade (BSG). The area was treated by injecting 4,760 gallons of treatment solution into 180 injection points over 9 days. Confirmation samples were collected in three sampling rounds at approximate one-month intervals after completion of the treatment, with soil samples analyzed for TPH.

Although the 30-Day results indicated progress, the property owner inquired through the environmental consultant about the possibility of additional injections to speed up the process. Biox recommended that the environmental consultant wait 60 days to allow the process to reach its full design potential. By the end of the three-month monitoring period, no identified TPH concentrations remained at levels above the default soil attenuation capacity. By recommending against an unnecessary supplemental injection, the environmental consultant and the property owner were spared unnecessary costs.

Injection Results