U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

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EPA Region 3, 74 pp, 2019

Former hazardous waste disposal at the 209-acre Crossley Farm site contaminated groundwater with PCE and TCE that migrated downgradient into residential wells. The site consists of three operable units (OUs)-point-of-entry treatment (POET) for residential drinking water wells (OU1), groundwater (OU2), and vapor intrusion (VI) of residential houses on top of the plumes (OU3). OU1 currently consists of 49 POET systems to remediate TCE in impacted homes. OU2 consists of the Hotspot Plume (>100,000 µg/L), Valley Plume (>1,000 µg/L), and Extended or Disdal Plume. Currently, the system is treating the Valley Plume using air stripping and a liquid phase carbon absorption and bag filtration polishing treatment to remove contamination. The system also includes a tank vapor emissions control system to treat vapor emissions from the influent tank. TCE in the combined influent measured 2,100 µg/L in 2012 at system startup but decreased to 100 µg/L in October 2018 and has removed as estimated 395 lbs of TCE and 42 lbs of PCE. To mitigate VI in OU3, vapor mitigation systems were installed at 18 residences that overlie the site-related groundwater contamination plume. EPA is currently performing the remedial design for the OU2 Hot Spot Area and has begun investigating the Extended or Disdal Plume.

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