Former Napa-1 Manufactured Gas Plant Site
2 Documents in Project
Summary
SCH Number
2021070071
Lead Agency
California Department of Toxic Substances Control
(DTSC)
Document Title
Former Napa-1 Manufactured Gas Plant Site
Document Type
NOD - Notice of Determination
Received
Posted
10/6/2022
Document Description
The project consists of the remediation of Operable Unit 1 (OU-1) and Operable Unit 2 (OU-2) at the former Napa-1 manufactured gas plant (MGP) site. OU-1 is owned by Pacific Gas and Electric Company (PG&E) and encompasses virtually all of the former Napa-1 MGP footprint. OU-2 is an off-site area that includes a portion of the Elm Street Townhomes property adjacent to and west of OU-1.
The remediation of OU-1 involves targeted removal of impacted soil (estimated at 16,000 cubic yards) from hot spots; installation of a cap (up to 4 feet clean soil, or asphalt/concrete); treatment of deep groundwater using in situ chemical oxidation coupled with in situ soil stabilization (ISCO/ISS); groundwater and soil gas monitoring; and land use covenants (LUCs) limiting land uses, restricting the extraction of groundwater, constraining activities that could compromise the integrity of the cap, and requiring cap-maintenance. Remedial activities for OU-1 are scheduled to be begin in Fall/Winter 2023 and are expected to take approximately twelve to sixteen months.
The remediation of OU-2 involves excavation of shallow impacted soil (estimated 1,300 at cubic yards) in selected areas to a depth of up to 4 feet and backfilling with clean soil; and LUCs. Remedial activities for OU-2 are scheduled to be begin in Fall/Winter 2023 and are expected to take approximately four months.
Contact Information
Name
Gavin McCreary
Agency Name
Department of Toxic Substances Control
Job Title
Project Manager
Contact Types
Lead/Public Agency
Phone
Location
Cities
Napa
Counties
Napa
Regions
Citywide, Countywide, Northern California
Cross Streets
Northwest of the intersection of Elm Street and Riverside Drive
Zip
94559
Other Location Info
Operable Unit 1 – 201-267 Riverside Drive, Napa, CA 94559
Operable Unit 2 – 1050 Elm Street, Napa, CA 94559
Notice of Determination
Approving Agency
Department of Toxic Substances Control
Approving Agency Role
Lead Agency
Approved On
County Clerk
Napa
Final Environmental Document Available at
Department of Toxic Substances Control
Cleanup Program Santa Susana Lab Project
8800 Cal Center Drive
Sacramento, California 95826
Envirostor link: https://www.envirostor.dtsc.ca.gov/public/profile_report?global_id=28490007
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
Yes
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
No
(3) Mitigated measures were made a condition of the approval of the project
No
(4) A mitigation reporting or monitoring plan was adopted for this project
No
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
Yes
Attachments
Final Document(s) [Approved_Certified draft environmental documents]
Notice of Determination
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