Argonaut Mine Tailings Feasibility Study/Remedial Action Workplan

4 Documents in Project

Summary

SCH Number
2022120003
Lead Agency
California Department of Toxic Substances Control (DTSC)
Document Title
Argonaut Mine Tailings Feasibility Study/Remedial Action Workplan
Document Type
NOD - Notice of Determination
Received
Posted
4/4/2023
Document Description
The Department of Toxic Substances Control (DTSC), pursuant to authority granted under Chapter 6.8, Division 20, section 25300 et seq approved a Argonaut Mine Tailings Feasibilty Study/Remedial Action Workplan which proposes conveyance improvements for stormwater management immediately downstream of the Argonaut Dam. The project site is located in the City of Jackson at the intersection of Argonaut Drive and Sutter Street. The project would convey stormwater to Jackson Creek following the retrofit design of the Eastwood Concrete Multiple Arch (CMA) Dam located on the Argonaut Mine Site in Jackson, California. The Concrete Multiple Arch Dam, also known as the Argonaut Dam, was built in 1916 and stands 46 feet in height and spans over 400 feet in length. Argonaut Dam was constructed as part of a historical gold mining operation and has impounded arsenic-contaminated mine tailings as a result of sediment runoff from more than 50 acres of private land in the city of Jackson. The project aims to provide conveyance of stormwater to Jackson Creek. The proposed RAP would involve the following specific improvements to be implemented to the existing drainage system: - Replace inlet structure to provide additional capacity near Vogan Toll Road and Sutter Street (existing open channel terminates at a 27-inch culvert); - Construct a 36-inch pipeline, which will be trenched under Sutter Street, to the fifth manhole; - Construct a 42-inch pipeline, which will be trenched under Sutter Street, from the fifth manhole to the westside of Highway 49/88; - Extend the 42-inch pipeline underneath Highway 49/88, by using a jack and bore technique to minimize disruption of existing public facilities; - Extend the 42-inch pipeline to an existing 10 by 10-foot culvert box that discharges into Jackson Creek using open trenching. Removal of the existing stormwater infrastructure would also be required as part of the proposed project. The existing stormwater infrastructure would be hauled to and consolidated behind the Argonaut Dam at an area designated as Tailings Area 3 which the U.S. Environmental Protection Agency (EPA) has indicated will be a repository for hazardous materials that will ultimately be capped. Activities associated with the Feasibility Study/Remedial Action Plan would occur over an approximately 3-month period.

Contact Information

Name
Andrew Reimanis
Agency Name
Department of Toxic Substances Control
Job Title
Project Manager
Contact Types
Lead/Public Agency

Location

Cities
Jackson
Counties
Amador
Regions
Citywide
Cross Streets
Argonaut Drive and Sutter Street

Notice of Determination

Approving Agency
Department of Toxic Substances Control
Approving Agency Role
Lead Agency
Approved On
County Clerk
Amador
Final Environmental Document Available at
www.envirostor.dtsc.ca.gov/public/profile_report.asp?global_id=03100002

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
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

Final Document(s) [Approved_Certified draft environmental documents]

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