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Sheridan staff recommends three-year landfill monitoring contract with TriHydro
Summary
City staff recommended a three-year, time-and-materials professional services agreement with TriHydro to continue required landfill methane, leachate and groundwater monitoring; the work is required by DEQ and the contract is budgeted within landfill operations.
Dan Roberts, Sheridan utilities director, told council members at the May 20 study session that city staff recommend a three-year professional services agreement with TriHydro Corporation to continue required environmental monitoring and reporting at the city landfill.
TriHydro would perform semiannual reporting and annual monitoring of about 50 wells, methane monitoring, gas-management tasks, leachate sampling and groundwater monitoring that the Wyoming Department of Environmental Quality requires under the site permit. Roberts said the firm has provided these services for the past five years and that the new three-year proposal is time-and-materials based.
City documents discussed during the session show TriHydro’s proposed total cost for the three-year period at $385,005.67 and the utilities director told council the firm’s bid was roughly 35% lower than the next-lowest proposal. Roberts said the city historically spent about $123,000–$130,000 annually for those services under prior contracts and that TriHydro has typically run under the city’s annual estimates.
Roberts said the monitoring program includes about 50 wells and that because of ongoing remediation work the number of wells requiring monitoring will likely drop starting in September, which he said should reduce future costs. He also said the current TriHydro contract ends in June and staff want a new contract in place by the start of the fiscal year.
On funding, Roberts said the proposed work is included in the landfill operations contractual professional services line in the proposed FY26 budget; that line shows $129,500 available for multiple landfill professional services and staff estimates $120,000 of that is for this project, with a modest shortfall they expect to absorb within the proposed budget without an amendment.
Council members asked whether the monitoring and reporting are mandatory and Roberts replied the reporting is required by DEQ. Councilman Patzic asked whether a larger-than-expected quantity of refuse uncovered by the “dig-and-flip” exercise would trigger additional monitoring costs; Roberts said the contract contains a force-account-like flexibility for extra quantities and he had not been made aware the project exceeded that allowance.
No formal council vote on the contract occurred during the study session; Roberts presented the staff recommendation and answered questions. If council advances the item, contracts and formal action would be expected at a later public meeting for approval.
