Explanation of Significant Differences for GBF/Pittsburg Landfill to Document Secondary Remedy Technologies to 1997 Remedial Action Plan

Summary

SCH Number
2021010135
Lead Agency
Toxic Substances Control, Department of (Department of Toxic Substances Control)
Document Title
Explanation of Significant Differences for GBF/Pittsburg Landfill to Document Secondary Remedy Technologies to 1997 Remedial Action Plan
Document Type
NEG - Negative Declaration
Received
Project Applicant
GBF Holdings, LLC
Present Land Use
landfill

Document Description
The Department of Toxic Substances Control (DTSC), pursuant to authority granted under Chapter 6.8, Division 20, section 25300 et seq is considering approving an Explanation of Significant Differences (ESD) which proposes secondary remedy technologies to the 1997 Remedial Action Plan (RAP) for the GBF/Pittsburg Landfill (Site). The Site is a capped and closed 84-acre landfill located northeast of the intersection of Somersville Road and James Donlon Boulevard in the City of Antioch. Due to historical operations, groundwater beneath the landfill is contaminated with primarily volatile organic compounds. DTSC is supervising the long-term monitoring and restoration of the groundwater in the area. The proposed Explanation of Significant Differences (ESD) proposes the following secondary remedy technologies: (1) installation of a hydraulic barrier wall, (2) a redesigned on-site GWETS, (3) an on-site soil vapor extraction and treatment system (SVETS), (4) in-situ groundwater remediation at two off-site locations, and (5) risk-based mitigation, where unacceptable indoor air risk from off-site soil vapor would be addressed on a case-by-case basis. The secondary remedy technologies would not fundamentally alter the overall cleanup approach. The remedial action objectives (RAOs) are and will continue to be containment of contamination, reduction of contamination, and attainment of standards which protect the beneficial uses of the waters.

Contact Information
Garrett Thornton
Department of Toxic Substances Control
8800 Cal Center Drive
Sacramento, CA 95826

Phone : (916) 255-3748
garrett.thornton@dtsc.ca.gov

Location

Cities
Antioch
Counties
Contra Costa
Cross Streets
Corner of Somersville Road and James Donlon Boulevard
Zip
94509
State Highways
4
Railways
UP and BNSF
Waterways
Suisun Bay

Notice of Completion

Review Period Start
Review Period End
Reviewing Agencies
California Air Resources Board California Department of Conservation California Department of Fish and Wildlife, Bay Delta Region 3 California Department of Fish and Wildlife, Marin Region 7 California Department of Parks and Recreation California Department of Resources Recycling and Recovery California Department of Transportation, District 4 California Department of Transportation, Division of Aeronautics California Department of Transportation, Division of Transportation Planning California Department of Water Resources California Governor's Office of Emergency Services California Highway Patrol California Native American Heritage Commission California Natural Resources Agency California Public Utilities Commission California Regional Water Quality Control Board, Central Valley Sacramento Region 5 California Regional Water Quality Control Board, San Francisco Bay Region 2 California State Lands Commission Central Valley Flood Protection Board Office of Historic Preservation State Water Resources Control Board, Division of Water Quality

Attachments

Environmental Document
Appendix A - Preliminary GBF Emissions Memo rev090420   PDF 825 K Appendix B - Construction Noise calcs   PDF 74 K GBF Pittsburg Landfill ESD Summary Form   PDF 109 K GBF Pittsburg Landfill Notice of Availability   PDF 100 K
Final Document(s)
GBF Pittsburg Landfill - Draft Initial Study clean final   PDF 8612 K
NOC
GBF Pittsburg Landfill NOC   PDF 220 K NOC - Project Description   PDF 34 K

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