English Abstract This report is the result of the RIVM-project
"International evaluation of in-situ biorestoration of contaminated soil and
groundwater". As a fellowship project, it was associated with the
international NATO/CCMS pilot project on "Demonstration of Remedial Action
Technologies for Contaminated Land and Groundwater". The philosophy of
in-situ biorestoration is to stimulate the indigenous soil microorganisms by
improving the environmental conditions in the soil using a water
recirculation system. The objective of the project is to show the
possibilities for application of the technique in relation with
contaminants, soil conditions and other site-specific circumstances by means
of integration and evaluation of results of in-situ biorestoration projects.
It can be used especially for locations at which both the unsaturated zone
and the groundwater are contaminated with hydrocarbons. A precondition is a
good permeability of the soil. If applicable, in-situ biorestoration is
generally more cost-effective than other remediation techniques; costs are
approximately between 40-80 US $/m3.
