TEC prepared the Environmental Impact Statement (EIS) for proposed homeporting of additional Atlantic Fleet surface ships at Naval Station Mayport, Florida. This proposed action includes permanent assignment of surface ships and personnel. The EIS assessed 13 alternatives; depending on the alternative, the proposed action includes wharf improvements, maintenance facilities improvements, utilities upgrades, personnel support improvements, construction of nuclear propulsion plant maintenance facilities, or dredging and disposal of dredged material.

Based on the mix of additional ships considered, the number of crew and support personnel associated with each alternative ranges from zero to 7,000. TEC evaluated potential impacts on community services and infrastructure and provided analysis of socioeconomic impacts using the IMPLAN model. Issues of particular concern relative to the sizeable construction program included potential effects on NRHP-eligible historic properties and stormwater control measures to ensure no net change in total maximum daily load of runoff discharged into the St. Johns River.

 As part of the analysis, TEC was tasked with determining the dredge material characteristics and volume. The required deepening would result in removal and disposal of approximately 5 million cubic yards of material. TEC evaluated possible upland disposal sites and conducted capacity analysis of existing open water dredged material disposal sites. Depending on material characteristics, TEC also evaluated beneficial uses, such as beach replenishment and habitat restoration. As part of this effort, TEC coordinated closely with the US Army Corp of Engineers and US EPA. TEC was also tasked to prepare Biological Assessments for US Fish and Wildlife Service and National Marine Fisheries Service, conduct an underwater archeological survey of the dredge project site, and perform socioeconomic modeling to identify potential impacts.