From
Patricia D. B. Redfearn
Title
Landfill Gas Control and Collection System Pre-NSPS Maintenance and Repair, Award a contract with Weaver Consultants for Design, Survey, Record Drawings and Permit Modification in the amount of $104,700
Presenter
James R. Cummings, Environmental Services Director
Recommended Action
Approve
Analysis
In 2000, the City of Grand Prairie Landfill installed a gas control and collection system, which included a header pipe connected to a series of wells, which were all placed under vacuum by a blower motor. This gas was drawn to a flare skid, where the methane, carbon dioxide and trace contaminants were destroyed at high temperatures. Over the years, the system has been periodically improved by re-drilling pinched off wells, increasing the density of the well-field, improving the flare, installing a control panel with data recording capability and providing maintenance to the blower motor.
On August 29, 2016, EPA announced final updates to its New Source Performance Standards (NSPS) to reduce emissions of methane-rich landfill gas from new, modified and reconstructed municipal solid waste (MSW) landfills. In a separate action, EPA also issued guidelines for reducing emissions from existing MSW landfills. The result is that the threshold for increased air quality compliance practices will be reached sooner than had been anticipated.
In anticipation of additional requirements, the landfill is proposing to change out the flare skid, which was purchased in 2000. This will provide for a new flare and blowers, which will be re-located away from the administration building’s parking lot and re-located at the landfill gas to energy facility. Improvements to the gas system will include a larger header pipe, which will be made of best materials currently available and this header pipe will extend out to the landfill gas facility. Underperforming wells will be re-drilled and the density of the well-field will be increased to pro...
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