EPA v. SOUTH WEYMOUTH NAVAL AIR STATION

Case summary

FEDERAL FACILITY AGREEMENT: SOUTH WEYMOUTH NAVAL AIR STATION #MA217002202 FY21 - ESDs for OU23 and OU24: The selected remedy for OU23 and OU24, the Industrial Operations Area (IOA), was documented in a ROD signed by the Navy and the U.S. EPA in September 2015, with concurrence from MassDEP. The selected remedy for the IOA was excavation and disposal of 1,862 cubic yards of soil to meet Residential Remedial Goals (RGs). The contaminants of concern were polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), pesticides, dioxins, and metals in surface soils. Soil excavation activities at the IOA were performed in two mobilizations, with the first between September 2016 and September 2018 and the second from January 2020 through June 2021. This ESD presents six revisions to the selected remedy outlined in the September 2015 IOA ROD which include: � development of new remedial goals (RGs) for several contaminants of concern (COCs), including seven PAHs, total PCBs, and chromium; � expanded OU24 to include impacted soil at Building 2; � revised (increased) the total volume of soil to be removed; � added a determination under the Toxic Substances Control Act (TSCA) that the remedial measures selected to address risks posed by PCB-contaminated soil, as modified by the ESD, will meet the no unreasonable risk of injury standard in accordance with TSCA regulatory standards at � 761.61(c); � addition of U.S. EPA guidance ��EPA Guidance on Remedial Actions for Superfund Sites with PCB Contamination; EPA/540/G-90/007 (August 1990)� as a To Be Considered (TBC) standard to the ROD�s Table D-1 ARARs table, and; � increased cost estimate for the remedy from $1.4 million to $7.5 million FY19: -ROD Amendment OU7 on 3/1/19; ESD-OU4 on 9/24/19; ESD-OU25 on 9/24/19 FY18: - ESD - No Further Action. FY17: - Removal of Contaminated Media: Removal of contaminated soil in the Buoy Storage Area, swale and wetland, and replacement with clean fill represented a permanent solution to the contaminant migration issue. This alternative removed contaminated soil with lead concentrations above the cleanup goal of 200 mg/kg, thereby allowing for unlimited use and unrestricted exposure of the Site (i.e., Buoy Storage Area, drainage swale and wetland). Completion of this alternative would eliminates the future need for LUCs, long-term monitoring and five-year reviews. Pollutant name and amount (cu yds): Arsenic, chromium, copper, lead, nickel and zinc. A total of 4,125 CY of soil was excavated and disposed of from depths ranging between 6 and 24 inches. The modification of the remedy removed previous ROD requirement for Institutional Controls, Monitoring, and Reporting. _______________________ FY15: ROD Ex Situ Treatment and Removal of Contaminated Media. Selected Remedy, consisting of soil excavation and offsite disposal addresses potential unacceptable human health risks associated with exposure through direct contact, incidental ingestion, or inhalation of fugitive dust of contaminated soil at the site. **Pre-excavation soil sampling will be conducted to further define areas to be excavated and post-excavation sampling will be conducted to confirm achievement of the Remedial Action Objective. (RAO). ________________ FY14: ROD Enhanced in-sit bioremdediation, biobarriers, MNA & LUCs __________ FY 2013 ROD for Ex Situ Treatment of ground water __________ FY 2013 ESD addressing Land use controls The $4.1 is just for the South Weymouth SRA ROD. The ESD was for the Fire Fighting Training Area and was just for ICs

Defendants (1)

• SOUTH WEYMOUTH NAVAL AIR STATIONNamed in complaintNamed in settlement

Facilities (1)

• US NAVAL AIR STATION

  1134 MAIN ST ROUTE 18, WEYMOUTH, MA, 02190-1559

  Registry ID: 110071100413

Statutes cited

• CERCLA 120E — Federal Facility Interagency Agreement

Enforcement conclusions (24)

• SOUTH WEYMOUTH NAVAL AIR STATION OU19entered 2008-01-16

  Primary law: CERCLA

• SOUTH WEYMOUTH NAVAL AIR STATION OU 23 & OU 24entered 2015-09-24

  Primary law: CERCLA

• SOUTH WEYMOUTH NAVAL AIR STATION OU18entered 2008-01-16

  Primary law: CERCLA

• SOUTH WEYMOUTH NAVAL AIR STATION (OU11) Bldg 82entered 2012-09-28

  Primary law: CERCLA

• SOUTH WEYMOUTH NAVAL AIR STATIONentered 2013-09-30

  Primary law: CERCLA

• SOUTH WEYMOUTH NAVAL AIR STATION OU10entered 2017-09-27

  Primary law: CERCLA

• SOUTH WEYMOUTH NAVAL AIR STATION - OU05 TILE LEACH FIELDentered 2006-05-03

  Primary law: CERCLA

• SOUTH WEYMOUTH NAVAL AIR STATION OU21entered 2009-03-04

  Primary law: CERCLA

• SOUTH WEYMOUTH NAVAL AIR STATION - OU4entered 2019-09-24

  Primary law: CERCLA

• SOUTH WEYMOUTH NAVAL AIR STATION - OU25entered 2019-09-24

  Primary law: CERCLA

Timeline (3 milestones)

• 1999-11-30Complaint Filed/Proposed Order
• 2006-09-16Enforcement Action Data Entered
• 2020-11-23Final Order Issued