2024 LEACHATE STORAGE TANK REPLACEMENT PROJECT
Summary
SCH Number
2024070815
Public Agency
Sonoma County
Document Title
2024 LEACHATE STORAGE TANK REPLACEMENT PROJECT
Document Type
NOE - Notice of Exemption
Received
Posted
7/22/2024
Document Description
The County of Sonoma is responsible for seven legacy closed landfill sites throughout the County, including the Guerneville, Roblar and Sonoma closed landfills. Each site has a leachate collection and recovery system consisting of collection sump pumps, transfer pumps, and mobile 22,000-gallon storage tanks. Leachate is pumped to the tanks and removed intermittently by tanker trucks. The leachate is hauled to the Laguna Sub-regional Wastewater Treatment Plant for treatment and disposal. During times of maximum leachate generation, typically during significant winter storms, the leachate storage volumes are insufficient at the sites, resulting in the need for continuous trucking of leachate during peak periods. If, for any reason, trucks are unable to access the sites during peak periods, there is a risk of overflow or spill of leachate. Increasing the amount of leachate storage reduces this risk. Additional storage would the increase in storage capacity will make the system more resilient to events that can interrupt removal, such as impaired trucking access, from flooded roads and slides, or a lack of capacity at the treatment facility due to volume overload across the system. Sonoma County proposes the installation of six landfill leachate storage tanks at three separate closed landfill sites (referenced above). The project involves the replacement of existing steel landfill leachate tanks with two (2) 200,000-gallon stainless steel leachate tanks at each of the landfill sites. Each of the project locations within the three closed landfill sites are on existing paved or gravel hardscape. The work would involve minor clearing and grubbing of weedy vegetation, installation of erosion control measures, minor site grading, excavation, backfill, and compaction, demolition/removal of existing utilities, installation of the six new 200,000-gallon stainless steel tanks and appurtenances, (including leachate piping, flow meter and vault, electrical improvements, instrumentation and controls, surface and restoration).
Contact Information
Name
Rich Stabler
Agency Name
Permit Sonoma
Job Title
Senior Environmental Specialist
Contact Types
Lead/Public Agency
Phone
Location
Cities
Guerneville, Petaluma, Sonoma
Counties
Sonoma
Regions
Countywide
Zip
95446
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Section 1530l(c) of the State CEQA Guidelines., Class 1, Existing Facilities
Reasons for Exemption
The proposed project is categorically exempt under Section 1530l(c) of the State CEQA Guidelines. ., Class 1, Existing Facilities. Class 1 includes the repair, maintenance, and minor alteration of publicly owned facilities involving negligible or no expansion of existing or former use.
County Clerk
Sonoma
Attachments
Notice of Exemption
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