TO: Napa-Vallejo Waste Management Authority Board of Directors
FROM: Chris Celsi, Executive Director
REPORT BY: Chris Celsi, Executive Director
SUBJECT: Agreement with Aptim Environmental & Infrastructure, LLC
RECOMMENDATION
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Approval and authorization for the Chair to sign Agreement No. 2026-09 with Aptim Environmental & Infrastructure, LLC, to perform an evaluation of the landfill Gas Collection and Control System (GCCS) at the American Canyon Sanitary Landfill (ACSL). The estimate for the evaluation is $20,032.
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EXECUTIVE SUMMARY
The ACSL has an active landfill gas collection and control system to help control and monitor the landfill gas (LFG) produced from the closed site. The system is designed to extract gas from the landfill through a series of conveyance pipes to the landfill gas flare station where the gas is burned off into the atmosphere. The Authority is fined by the Bay Area Air Quality Management District if the system goes down and fails to flare the gas, which has occurred a few times since 2020. An evaluation of the GCCS is warranted to help protect the environment and avoid future fines from the District. The GCCS consists of the following components:
? Forty-nine (49) landfill gas extraction wells
? Thirty-four (34) landfill gas / leachate dual extraction wells
? Condensate collection system
? Landfill gas header / conveyance pipes
? Flare and blower equipment system
? Seven (7) landfill gas monitoring probes
? Leachate collection system
The primary objectives of the landfill GCCS is to maintain compliance with local, state, and federal regulations regarding air emissions from solid waste landfills. The secondary objectives would include minimizing lateral gas migration potential and reducing groundwater impact potential. The GCCS at ASCL has been in operation for almost 30 years. Due to the age of the system and the nature of landfill gas, it has been noted that several components of the GCCS may be degrading and may not be func...
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