Apparatus for passive removal of subsurface contaminants and volume flow measurement

This invention relates generally to systems for passive removal of subsurface contaminants and flow measurement. More specifically, this invention is a passive removal valve apparatus for removing subsurface contaminants integrated with a volumetric flow meter. A system for improving the Baroball valve and a method for retrofitting an existing Baroball valve. This invention improves upon the Baroball valve by reshaping the interior chamber of the valve to form a flow meter measuring chamber. The Baroball valve sealing mechanism acts as a rotameter bob for determining volume flow rate through the Baroball valve. A method for retrofitting a Baroball valve includes providing static pressure ports and connecting a measuring device, to these ports, for measuring the pressure differential between the Baroball chamber and the well. A standard curve of nominal device measurements allows the volume flow rate to be determined through the retrofitted Baroball valve.