Conceptual framework

  • Existence of contamination due to the presence of buried fuel tanks.
  • Mostly vertical, and partially horizontal, percolation of hydrocarbons in the subsoil, affecting the different strata of the underground environment, both in unsaturated and saturated zones.
  • Presence of floating pure product in groundwater.
  • Presence of soil with fibercement.


– Phase I: Removal of buried tanks and selective excavation of soil.

  • Removal of tanks; degassing, inerting and dismissing in industry.
  • Selective excavation:

Management of 8,54 Tn of soils with asbestos.
Management of 220 Tn of debris (Soils Class III- dangerous).
Management of 536,92 Tn of contaminated land (Soils Class II).

– Phase II: Sanitation of the saturated zone, due to the presence of fuel-type pure product.

  • Implementation of a pure product extraction system:

Direct extraction of floating pure product using an oleophilic Abanaki-type oil grabber.
Generation of collection cones by electric submersible pumping.


– Phase I: ZNS Treatment

  • Elimination of the primary focus (tanks) and secondary (soils in unsaturated zones impregnated with fuel).
  • Verification of remaining soils, resulting in values higher than those established according to RD 9/2005.
  • Calculation of Quantitative Analysis of Residual Risk, certifying an acceptable risk for human health.

– Phase II: ZS Treatment

  • In operation, after 6 months of work:

Reduction of the pure product thickness in the underground environment compared to initial values.
Recovery of a fuel volume greater than 600 liters.

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