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 functioning as originally designed. The objectives of the assessment are:
Analyze historical LFG wellfield monitoring data to estimate current and future productivity of the wells and the overall site
Check the impact of liquid levels on the LFG extraction wells
Verify the integrity of the existing GCCS components
Recommend improvements required to address operation issues, site compliance and protect human health and the environment for the duration of landfill post-closure
APTIM proposes the following tasks for the scope of work below:
Task 1 - Review Historical Operation and Maintenance (O&M) Records
Task 2 - Flare/Blower System Evaluation
Task 3 - Field Evaluation
Task 4 - Preparation of Evaluation Report
FISCAL & STRATEGIC PLAN IMPACT
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Is there a Fiscal Impact? |
Yes |
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Is it currently budgeted? |
No |
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Where is it budgeted? |
81000010 |
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Is it Mandatory or Discretionary? |
Discretionary |
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Discretionary Justification: |
The Authority would like an evaluation conducted to determine if improvements are needed to avoid being in violation of air laws. |
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Is the general fund affected? |
Yes |
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Future fiscal impact: |
Compliance with local, state, and federal regulations regarding air emissions from solid waste landfills could allow to avoid fines when intermittent shutdowns occur. |
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Consequences if not approved: |
Failure to prevent intermittent shutdowns could lead to increased fines by Bay Area Air Quality Management District (BAAQMD). |
ENVIRONMENTAL IMPACT
ENVIRONMENTAL DETERMINATION: The proposed action is not a project as defined by 14 California Code of Regulations 15378 (State CEQA Guidelines) and therefore CEQA is not applicable.