How are the vents different from wells already around the site?

Wells and vents serve different purposes. Wells are usually located on the edge of former landfill and are designed to detect whether there is gas in the ground and if it is moving offsite. Gas samples are taken from these wells and measured. Vents are installed to provide a passive pathway to allow gas to be released from the ground. They are a less-invasive measure than installing a deep trench or bounding wall.