Caratterizzazione di un plume di cloruro di vinile in un acquifero confinato attraverso perforazioni direct-push, campionamento e spurgo con tecnica low-flow

The paper deals with a sandy confined aquifer contaminated by vinyl chloride. Plume investigation followed three steps with a progressive downscaling: 1) a regional hydrogeological characterization; 2) a hydrochemical survey of existing long-filtered boreholes; 3) a direct-push drillings based characterization. The investigation identified, a plume with a length of 1.7 and a width of 0.3 km with VC concentration up to more than 11000 ppb and total absence of other chlorinated compounds. To optimise VC analysis the coupled use of an inertial pump for collecting the sample was verified preceded by a short term low flow purging by peristaltic pump