Mission Bay South Block 14 School Removal Action Workplan
4 Documents in Project
Summary
SCH Number
2021050349
Lead Agency
San Francisco Unified School District
Document Title
Mission Bay South Block 14 School Removal Action Workplan
Document Type
NOD - Notice of Determination
Received
Posted
9/23/2022
Document Description
The Department of Toxic Substances Control (DTSC) approved the Removal Action Workplan (RAW) for the Mission Bay South Block 14 School Project located at Mission Bay Drive at Owens Street, San Francisco, California (Project Site). The RAW remediation activities consist of installing engineered covers and caps over impacted
fill material at the Project Site and installing a Vapor Intrusion Mitigation System (VIMS) to mitigate volatile organic compounds (VOCs) and methane vapor intrusion into the buildings.
To address total petroleum hydrocarbons (TPH), polycyclic aromatic hydrocarbons (PAHs), VOCs, and metals that exceed their respective residential screening levels, the following remediation activities will be implemented:
Engineering Cover: In areas of landscape, a minimum of 1 to 1.5 feet of impacted fill material would be removed, a water permeable “marker” fabric placed, and covered with a minimum of three feet of clean import fill. Following the removal of impacted material, clean import fill would cover the impacted fill material and reduce potential risks to human health and the environment.
Engineering Cap: Engineering caps would be constructed of concrete, asphalt, or other impermeable material. Engineering capped areas would generally be utilized for pathways (e.g., sidewalks), around buildings, and over multi-use spaces.
Vapor Intrusion Mitigation System: In order to address the indoor air inhalation pathway, the design, installation, and operation of a site-specific, active VIMS system would be installed as part of the redevelopment of the site. Installation of a VIMS at the site would mitigate the potential migration of methane and VOCs to indoor air in the proposed buildings from the subsurface. The VIMS would consist of a sub-slab venting system, an impermeable vapor barrier, a sub-slab gas detection system, and an active sub-slab mechanical extraction system.
Contact Information
Name
Elizabeth Tisdale
Agency Name
Department of Toxic Substances Control
Job Title
Project Manager
Contact Types
Responsible Agency
Phone
Location
Cities
San Francisco
Counties
San Francisco
Regions
San Francisco Bay Area
Zip
94102
Other Location Info
Mission Bay Drive at Owens Street, San Francisco
Notice of Determination
Approving Agency
Department of Toxic Substances Control
Approving Agency Role
Responsible Agency
Approved On
County Clerk
San Francisco
Final Environmental Document Available at
www.envirostor.dtsc.ca.gov/public/
Determinations
(1) The project will have a significant impact on the environment
No
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
No
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
No
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
Yes (Statement of Findings)
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
Yes
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
Yes
Attachments
Notice of Determination
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