Assessment, Remediation and Regulatory Closure of Five (5) Areas of Concern For a Mid-Sized Regional Airport Authority, Worcester, MA

TANK FARM

SOIL EXCAVATION

MAINTENANCE AREA

INSTALL NAPL RECOVERY WELL

In December 1999, a Baseline Assessment conducted of the Worcester Regional Airport led to the discovery of multiple MassDEP listed Disposal Sites (Areas of Concerns) warranting further assessment and/or remedial action. CEA subsequently conducted numerous Assessment Activities,
Method 1, 2 and/or 3 Risk Characterizations, and Remedial Actions which led to Regulatory Closure of Five (5) Areas of Concern.

PROJECT HIGHLIGHTS

Tank Farm Area

  • The Tank Farm was listed as a disposal site due to a release of aviation gasoline that has impacted soil and groundwater in the area. Light non-aqueous phase liquid (LNAPL) had also been detected in a number of onsite monitoring wells above the MCP Upper Concentration Limit (UCL) of ½ inch. CEA conducted Immediate Response Action (IRA) and Release Abatement Measure (RAM) activities, including soil excavation in the LNAPL-impacted in an effort to remove the petroleum-impacted soils and LNAPL impacts in the area.
  • CEA submitted a Class A-2 Response Action Outcome to MassDEP supported by a Method 3 Risk Characterization which demonstrated that a condition of No Significant Risk to health and the environment existed at the Site.

Maintenance Area

  • CEA conducted Immediate Response Actions to address a release of gasoline, including soil excavation, NAPL gauging and bailing and Enhanced Fluid Recovery. CEA also conducted soil, groundwater, soil gas and indoor air sampling.
  • CEA submitted a Class A-2 Response Action Outcome to MassDEP supported by a Method 3 Risk Characterization which demonstrated that a condition of No Significant Risk (NSR) to health and the environment existed at the Site.

Glycol Recovery Area

  • CEA conducted Phase I assessment activities of this area which was listed as a disposal site due to the presence of polycyclic aromatic hydrocarbons (PAHs) in soil above MCP Reportable Concentrations. The Phase I activities were successful in demonstrating that the PAH impacts were associated with fill material and not due to a release.
  • CEA submitted a Class B-1 Response Action Outcome to MassDEP supported by a Method 3 Risk Characterization which demonstrated that a condition of No Significant Risk to health and the environment existed at the Site.

Hangar 2 Outfall Area

  • CEA conducted assessment of this storm drain outfall pipe discharge area which was listed as a disposal site due to the discovery of PAH impacts in surficial soils and sediment discovered during a baseline assessment.
  • Upon completing the assessment activities, CEA submitted a Class B-1 Response Action Outcome to MassDEP supported by a Method 3 Risk Characterization which demonstrated that a condition of No Significant Risk to health and the environment existed at the Site without the need for response actions.

Cold Storage Building Area

  • WRA officials obtained knowledge of a reportable condition during a removal of a 5,000 gallon gasoline UST at the Site. CEA subsequently performed Phase I and Phase II assessment activities which included: advancement of soil borings, soil sampling, monitoring well installations, and groundwater monitoring. All residual soil and groundwater impacts were below Method 1 Soil Standards and Method 2 Groundwater Standards.
  • CEA submitted a Class A-2 Response Action Outcome to MassDEP supported by a Method 1 / 2 Risk Characterization which demonstrated that a condition of No Significant Risk (NSR) to health and the environment existed at the Site.