“operating expense” means any expense, other than a capital expense, that is incurred by a regional solid waste commission;
“post-closure expenses” means expenses incurred by a regional solid waste commission for all activities performed in relation to the monitoring of a sanitary landfill site and the protection of the environment after solid waste is no longer deposited at the site, including the monitoring of ground water and surface water, the monitoring and treatment of leachate, the monitoring and recovery of landfill gas, the construction and ongoing maintenance of control systems, the construction and maintenance of drainage systems, any acquisition of additional land for buffer zones, site security and final coverage.