Explanation of Significant Differences, Polychlorinated Biphenyl Cleanup, Building 84/84A, Investigation Area D1.3, Lennar Mare Island,


SCH Number
Public Agency
Department of Toxic Substances Control
Document Title
Explanation of Significant Differences, Polychlorinated Biphenyl Cleanup, Building 84/84A, Investigation Area D1.3, Lennar Mare Island,
Document Type
NOE - Notice of Exemption
Document Description
The Explanation of Significant Differences (ESD) discusses modifications to the remedy described for Building 84/84A in the Final Investigation Area D1 Remedial Action Plan (RAP). The RAP was approved by the California Department of Toxic Substances Control (DTSC) on May 27, 2004. The proposed Project will clean up building materials from the interior of Building 84/84A (Figure 3) on Mare Island that contain polychlorinated biphenyls (PCBs) at concentrations that exceed the unrestricted cleanup level. No cleanup of exterior surfaces is proposed as part of the Project. The cleanup will include removal of non-structural building materials and PCB-contaminated paint and materials from interior surfaces such as concrete, wood, metal, and brick. Building materials and indoor air will be sampled to determine when remediation is complete. Previous remediation included removal of portions of the building floor, which resulted in exposed soil within the building. If post-remediation testing identifies soil with PCBs exceeding the unrestricted use cleanup level, the soil will be removed. Removed materials will be hauled off-site by truck for disposal at the appropriate permitted disposal facilities.

Contact Information

Allan Fone
Agency Name
Department of Toxic Substances Control
Job Title
Senior Environmental Scientist
Contact Types
Lead/Public Agency


Citywide, Countywide, Northern California, San Francisco Bay Area
Cross Streets
Flagship Drive, Mare Island, Former Mare Island Naval Shipyard,
Other Location Info
Building 84/84A

Notice of Exemption

Exempt Status
Type, Section or Code
Common Sense Exemption [14 CCR, Sec. 15061(b)(3)]
Reasons for Exemption
Based on analysis of the project activities above, DTSC has determined with certainty that there is no possibility that the activities in question may have a significant effect on the existing environment because the project, being mainly indoors, would not result in "a substantial, or potentially substantial, adverse change in any of the physical conditions within the area affected by the project, including land, air, water, minerals, flora, fauna, ambient noise, and objects of historic or aesthetic significance.” The site is in a previously developed area and does not provide habitat value. The project is consistent with applicable state and local environmental permitting requirements including, but not limited to, air quality rules such as those governing emissions and approved by the regulatory body with jurisdiction over the site (e.g., City of Vallejo; Bay Area Air Quality Management District; etc.). Although Building 84/84A is a Notable Resource, a Certificate of Appropriateness from the City of Vallejo Architectural Heritage and Landmarks Commission is not required because the project will not affect the building exterior.
County Clerk


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