The decisions to conduct the above-mentioned removal actions were based on these findings. The additional sampling work was conducted between October 1996 and January 1997. Based on the information found in the Remedial Investigation phase, the Navy fast-tracked cleanup activities at various sites. The Record of Decision for site 26 was signed on September 29, 1998. The design of the air sparging system for site 26 has been completed and implementation of a full scale system is planned for the Summer of 2000.
Options being considered include capping, institutional controls, and restriction of groundwater.
The final design plans and specifications for the landfill caps at sites 4 and 5 were submitted in December, 1997. The work plan for the excavation and remediation at site 19 was submitted in December, 1997. The work commenced in January 1998 and was completed in March, 1998. EPA has determined that the Naval Weapons Station site does not pose an imminent threat to the surrounding population or the environment while the investigations and remediations are taking place.