Environmental

Site 02

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Site 2 - Waste Disposal Area B

Background: Site 2 is a 6.2-acre site in the southern portion of SJCA. The site includes an unlined waste disposal area that operated from 1921 until some time after 1947. Initially, refuse was burned openly onsite and used to fill in portions of a tidal inlet that was located in the center of the site and was connected to St. Juliens Creek by a culvert. Mixed municipal wastes, solvents, waste ordnance, and abrasive blast media from ship overhaul and repair operations were disposed at the site. An incinerator was installed in 1942 to replace the open burning practices.

Remedial Investigation (RI) activities indicated potential risks to human health and the environment from exposure to chemicals in waste, soil, sediment, surface water, and shallow aquifer groundwater. The primary contaminants identified were chlorinated solvents (trichloroethene [TCE] and its breakdown products) in shallow groundwater and surface water and inorganics and polycyclic aromatic hydrocarbons (PAHs) in soil and sediment. The Proposed Plan identified soil cover, excavation, enhanced reductive dechlorination (ERD), monitored natural attenuation (MNA), and land use controls (LUCs) as the preferred remedial alternative for addressing the human health and ecological risks. The record of decision (ROD) documenting the selected remedy has been signed. The remedial action was initiated in 2012 and the construction phase of the remedial action has been completed.

Site 2 Remedial Action

Specific components of the remedial action include the following:
  • Cover installation over waste, soil, and inlet sediment
  • Excavation of St. Juliens Creek sediment
  • ERD within high-concentration chlorinated solvent target area of shallow groundwater
  • MNA within low-concentration chlorinated solvent, naphthalene, and heptachlor epoxide target areas of shallow groundwater
  • LUCs
    • Maintain the soil cover and prevent exposure to waste and contaminants in soil and inlet sediment
    • Prevent direct exposure to and/or potable use of shallow groundwater

The remedial action is being completed in a phased approach, as follows:

Phase 1 – Preparatory Activities (complete)
  • Existing building foundation and surface debris demolition
  • Storm water and drainage modifications to re-route drainage around Site 2
  • Compensatory wetland mitigation to offset permanent loss of Site 2 wetland

Phase 2 – Cover System Installation (complete)

Phase 3 – St. Juliens Creek Sediment Excavation (complete)

Phase 4 – Groundwater Treatment (in progress)

  • ERD Treatment
    • Emulsified vegetable oil injected into the high-concentration chlorinated solvent target area
      • Emulsified vegetable oil will stimulate naturally occurring microbes in the subsurface to breakdown the chlorinated solvents
    • Additional microbes injected to further aid in breakdown of chlorinated solvents to nontoxic products
    • Injection layout consists of a series of rows placed perpendicular to groundwater flow
      • Groundwater is expected to flow through these rows and be treated
  • MNA
    • Being conducted concurrently with ERD performance monitoring
    • Sampling will confirm concentrations are decreasing and groundwater conditions will allow for further reductions in the contaminant concentrations
    • Additional ERD treatment may be necessary if concentrations stop decreasing

 

Because hazardous substances, pollutants, or contaminants remain on site, a five-year review was conducted in 2020 to determine if the selected remedy remains protective of human health and the environment. The Third Five-Year Review for SJCA indicated that the remedy is in place, functioning as designed, and is protective of human health and the environment. Exposure pathways that could result in unacceptable risk have been addressed by previous remedial action activities and continue to be controlled through a combination of a soil cover and land use controls (LUCs), and Remedial Action-Operation (RA-O) maintenance and monitoring is ongoing.

CERCLA Status: The remedial action is currently in the operation phase. The remedial action-operation phase includes groundwater monitoring and additional emulsified vegetable oil (EVO) injections, as needed. LUCs are in place to prevent unacceptable exposure to waste and COCs in soil, inlet sediment, and shallow aquifer groundwater.

Next Steps: Remedial action-operation, implementation and maintenance of the LUCs, and five-year reviews will continue until the remedial action objectives are met.

 

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