EPA v. OTIS AIR FORCE BASE/MASS MILITARY RESERVATION

Case summary

10/2/2025: Long-term management with groundwater monitoring, UXO construction support, full annual MEC (munitions and explosives constituents) sweeps, warning signs and public education pamplets, DigSafe, annual inspections of fencing. Land use controls with UXO construction support, full annual MEC (munitions and explosives constituents) sweeps, warning signs and public education pamplets, DigSafe notifications. ESD documents upward changes to clean-up levels at cited OUs. Increase in cleanup levels does not significantly reduce the time to achieve cleanup at CS-19, FTA-2/LF-2, or PFSA/FS-10/FS-11. Based on new cleanup level, FS-13 has reached cleanup. 10/03/2024: Federal Facility ROD ordering Removal of Contaminated Media in OU 30. Excavate lead contaminated soil and off-site disposal. FEDERAL FACILITY AGREEMENT: OTIS AIR FORCE BASE 04/06/22 The selected remedy at OU29 is land use controls which includes annual sweeps for uxo, operation and maintenance of signage, and reporting in program-wide annual LUC report. 1/14/21 ESD adds 1,4-Dioxane as a contaminant of concern to the existing CS-10 groundwater plume pump and treat remedy. Cleanup level is a site-specific risk-based remediation goal of 0.46 micrograms per liter. Costs are associated with additional monitoring in the plume and treatment plant. FY16 #22 Selected remedy is monitored natural attenuation with land use controls, monitoring, and report. Contaminants of concern are: 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, 2-methylnapthalene, and select EPH/VPH carbon ranges. Original ROD was a source control ROD and did not identify a groundwater plume because BTEX concentrations had fallen below actionable levels. Current COCs were not identified at that time (1998). FY16 #21 Selected remedy is monitored natural attenuation with land use controls, monitoring, and report. Contaminants of concern are: 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, 2-methylnapthalene, and select EPH/VPH carbon ranges. Original ROD was a source control ROD and did not identify a groundwater plume because BTEX concentrations had fallen below actionable levels. Current COCs were not identified at that time (1998). #18FY 2015: Reduction of Ongoing Releases, Institutional Controls/Land use controls, Monitoring and Reporting. #19FY 2015: Ex Situ Treatment, Institutional Controls, Monitoring and Reporting. #20 FY 2015: Removal of Contaminated Media FY 2014: OU13 & 20 FY 2014: OU14 OU21 & OU22 GW P&T FY 2014: OU13 & OU20 Monitor Natural Attenuation and Land Use Controls

Defendants (1)

• OTIS AFB/MASS MILITARY RESERVATIONNamed in complaintNamed in settlement

Facilities (1)

• MA AIR NATIONAL GUARD 102ND FIGHTER WING OTIS

  158 REILLY ST, BUZZARDS BAY, MA, 02542

  Registry ID: 110071100907

Statutes cited

• CERCLA 120E — Federal Facility Interagency Agreement

Enforcement conclusions (28)

• OTIS AIR FORCE BASE/MMR OU24entered 2009-09-30

  Primary law: CERCLA

• OTIS AIR FORCE BASE/MASS MILITARY RESERVATION (Groundwater several OUs)entered 2011-09-14

  Primary law: CERCLA

• OTIS AIR FORCE BASE/MASS MILITARY RESERVATION - DEMO AREA 1entered 2013-09-30

  Primary law: CERCLA

• OTIS AIR FORCE BASE /SOURCE AREA OPERABLE UNITentered 2013-09-30

  Primary law: CERCLA

• OTIS AIR FORCE BASE/MASS MILITARY RESERVATION OU14, 21 & 22entered 2014-09-30

  Primary law: CERCLA

• OTIS AIR FORCE BASE/MASS MILITARY RESERVATION - Demoliton Area 2entered 2015-09-30

  Primary law: CERCLA

• OTIS AIR FORCE BASE/MMR -CS-19entered 2006-07-07

  Primary law: CERCLA

• OTIS AIR FORCE BASE/MMR CS 23entered 2007-09-28

  Primary law: CERCLA

• OTIS AIR FORCE BASE/MASS MILITARY RESERVATION - SMALL ARMS RANGESentered 2015-09-30

  Primary law: CERCLA

• OTIS AIR FORCE BASE/MASS MILITARY RESERVATIONentered 2016-09-29

  Primary law: CERCLA

Timeline (3 milestones)

• 1996-05-15Complaint Filed/Proposed Order
• 2006-09-16Enforcement Action Data Entered
• 2025-08-26Final Order Issued