Client: Confidential
Location: Ada, Oklahoma
Project: UST System Closure and Suspicion of Release
Project Characteristics: Ensolum, LLC (Ensolum) Consultants worked closely and collaborated with the client and their other contractors, as well as affected stakeholders, and state agencies on a pipeline release resulting in 20 barrels of product migrating off-site and into navigable waters.
- Ensolum provided response oversight, direction, support and documentation on behalf of the client during the initial corrective action progress.
- Our consultants implemented a combination of excavation and in-situ remediation activities to recover free liquids and remove/treat contaminated soil affected by the release. There was clear and constant communication with on-site client and stakeholder personnel to ensure that additional assets were not compromised during remediation activities.
- Following remediation, Ensolum geologists developed a sampling program to determine whether various chemicals of concern (COC’s) remained on site, in accordance with regulatory guidelines set by the Texas Commission on Environmental Quality (TCEQ). Soil sample analyses had shown that the targeted COC’s were either not detected or less than the applicable protective contamination levels (PCL’s) set by the TCEQ.
- Based on the results of the sampling program, Ensolum had determined that the response actions performed on the site were completed in accordance with TCEQ guidelines and no further investigation or remediation was required.
- Ensolum’s findings were submitted in a report to the TCEQ, and the project was subsequently closed.
Project Detail:
Ensolum personnel provided environmental consulting services related to the release of petroleum hydrocarbons from three (3) underground storage tanks (USTs) at a former fuel station facility. Ensolum was retained to collect and analyze soil samples during tank removal activities under Oklahoma Administrative Code (OAC) Title 165, Chapter 25 (Underground Storage Tanks). While uncovering the USTs, an additional two (2) unregistered tanks were identified. In total, all five (5) tanks were drained of fluids and removed according to Oklahoma Corporation Commission (OCC) regulation.
Subsequent to the tank removal, Ensolum was retained to complete a subsurface investigation for an activated Suspicion of Release case under OAC Title 165, Chapter 29 (Corrective Action of Petroleum Storage Tank Releases). Under the directives of the OCC Petroleum Storage Tank Division (PSTD), Ensolum then installed two (2) monitoring wells for soil and groundwater analysis. Concentrations of benzene, TPH-GRO (gasoline), and TPH-DRO (diesel) were encountered in soil and groundwater at the site. Once Ensolum personnel have fully delineated the plumes, remediation efforts can commence to ensure that the site does not pose any future risk to human health or the environment.
