Soil vapors leave the blower and go to a thermal oxidizer, a furnace where all of the hydrocarbons are burned off. Propane or natural gas is used as a make-up fuel to keep the thermal oxidizer burning if the soil vapor stream isn't hot enough or doesn't sustain combustion. Air stripper exhaust joins the soil vapor stream in the thermal oxidizer. PSH skimmed off by the separator goes to a batch tank for eventual removal. This sir stripper is an old-fashioned model consisting of a tub with air manifold across the bottom.
Water enters high and exits low.
Air exits the top and goes to its own treatment. Trenching cut for the soil vapor and groundwater recovery lines run from the wells back to the treatment compound. This site has very shallow groundwater. A very large double-diaphragm pump was used to depress the water table in an underground storage tank so that work could begin. This is at the site with the shallow groundwater shown in the bottom of the trenches.