Petroleum & Gas Station Remediation

Gas Station RemediationE-21's personnel experience in underground storage tank (UST) and leaking underground storage tank (LUST) services is comprehensive and includes environmental compliance with local, state, and federal regulations, risk management, design, and construction of soil and groundwater remediation systems. We are one of the leading firms for assisting in compliance with the State of Colorado Petroleum Storage Tank Reimbursement Program (the "Tank Fund") and assisting in the preparation applications for reimbursement.

E-21 personnel have conducted over 400 UST assessments, closures and LUST investigations, and our staff members have experience on over 1,000 UST and LUST projects. Our services and experiences include tank removals, closure inspections, closure reports, Phase II site assessments, monitoring well installations, LUST plume investigations, soil vapor surveys, water and vapor analyses, completion of Site Summary Forms (SSF's), Site Characterization  Report (SCR) preparation,  Corrective Action Plan (CAP) development, remediation design, contaminated soil excavation and disposal, and soil/water treatment system installation and operation.
Our UST services personnel are familiar with the state regulations and guidelines for closures, investigations and corrective actions administered by the Colorado Division of Oil and Public Safety (OPS). We conduct our inspections, observations, and investigations using instrumentation and procedures meeting or exceeding current standards of the profession. Field instrumentation employed includes: photoionization detectors, organic vapor analyzers, and gas chromatography equipment for field screening activities and quantitative documentation of observations. For site assessment and plume delineation investigations, we use soil headspace analyses, soil vapor surveys, soil borings, and/or monitoring well installations. In many instances, a soil vapor survey or direct push mini-boring/well advancement can provide information for optimum monitoring well locations at a significant cost savings to the overall project.

We strive to use the most cost effective and technically suitable remediation methods. Remediation methods our personnel have used on LUST clean-up projects include:

  • In-situ soil vapor extraction (SVE)
  • Excavation and aeration
  • Excavation and off-site soil disposal
  • Air-stripping
  • Air-Sparging
  • Enhanced Fluid Recovery (EFR)
  • Bio-Reactor processing
  • Activated carbon adsorption