East Third Avenue Landfill (Seal Point Park) Project
2 Documents in Project
Summary
SCH Number
2026020239
Public Agency
California Regional Water Quality Control Board, San Francisco Bay Region 2
(RWQCB)
Document Title
East Third Avenue Landfill (Seal Point Park) Project
Document Type
NOE - Notice of Exemption
Received
Posted
2/23/2026
Document Description
The Project will perform exploratory trenching to determine the source of suspected hydrogen sulfide discharge and provide a remedial action to impede landfill leachate from entering the onsite mitigation wetlands from the East Third Avenue Landfill. It was determined that landfill leachate is likely seeping from the landfill into the upland side of the wetland. Project activities will include creating a 25-foot-long trench that will be 4-5 feet wide and 5-6 feet deep. Then a 2-foot-wide bentonite cut-off wall consisting of bentonite, or a combination of bentonite and cement grout slurry, will be installed to prevent landfill leachate from continuing to travel into the wetland. This will also consist of 2 feet of drainage rock on the upslope side of the wall surrounded by non-woven polypropylene geotextile fabric, and a well riser to provide future liquid monitoring. If a discharge pipe is found to be causing the seep, it will be capped off and leachate monitoring will be conducted via the landfill’s Leachate Monitoring Well network. Following construction, the wall will be backfilled with a minimum of one foot of native soil, and the site will be returned to its pre-disturbance elevation and grade. The upper 6 inches of existing wetland vegetation removed prior to construction will be replaced, and the area will be seeded with a native erosion control mix.
Contact Information
Name
Jackson
Agency Name
SF Bay Regional Water Board
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency
Phone
Location
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
15330
Reasons for Exemption
The Project will prevent continued leaching of hydrogen sulfide from the East Third Avenue Landfill into the adjacent mitigation wetland.
Attachments
Notice of Exemption
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