Zedelgem (Belgium): CVOC

In-situ remediation technique: Pump & treat

Project name: Zedelgem (Belgium): CVOC Case submitted by: Groundwater Technology BV Contact: Yvo Veenis Address: PO Box 12115 3004 GC ROTTERDAM Telephone number: Email-address: yve@gtbv.nl

Country: Belgium City/region/county: City of Zedelgem , Flanders (future) use of location: Industry Built-up location during the active remediation phase?: Yes

In situ saneringstechniek: Pump & treat

Explanation technique: The project involved a pump+treat remediation for a chlorinated hydrocarbon site with three water layers: 9-11, 14-16 and 21-25 meters below grade. The contaminants are located underneath a wood storage and production facility. 80% of the deepwells are installed inside the production facility, with little disturbance of usual ongoing business. The piping inside the production facility is installed at the roof of the building at a height of 8 meter above grade. The extracted water is discharged to a water treatment system with a capacity of 25 m3/hr. With the treatment was involved: settlement tank, air stripping tower and air carbon treatment. After about 4 years of treatment, the project was successfully closed with a formal ‘Final Declaration’, issued by the authorities, stating that no further action is required. Also other remediation techniques applied?: No After care needed?: No Rationale for the chosen technique: The consultant performed a phase 1 and 2 investigation and evaluated several remediation techniques. Based on the findings it was decided that given the large impacted area, the three confined water layers and the small amount of mass, P&T would be the most effective technique to remediate this site.

Treated contaminant(s): Chlorinated volatile organic compounds (CVOC) Contaminant phase: Groundwater Size contamination: >500.000 m3 Depth contamination: 25 [m –mv]

Soil type: Layered soil: clay/peat/sand Saturated/unsaturated zone?: Saturated zone Permeability: <0,01 m/day, estimated from bore logs Flow velocity or gradient groundwater: Not existent

Remediation goal: Final concentration: Dichloroethane 60 ug/l; Dichloroethenes 100 ug/l; Viylchloride 10 ug/l Remediation goal achieved?: No, but the concentration has been decreased significantly reducing the risk. Initial and final concentration and load removal: Dichloroethane: initial concentration 540 ug/l; final concentration 210 µg/l DichloroetheneTrichloroethene: initial concentration 2700 ug/l; final concentration 87 µg/l Vinylchloride: initial concentration 57 µg/l; final concentration 72 µg/l Active remediation phase: 01/07/2006 till 22/07/10 Passive remediation phase: The passive phase is finished. Execution period:01/01/2009 till 01/01/2010 Total costs passive/after care phase: Total costs active phase: € 530.000 ,-

Problem owner: Jimoc NV Contractor: Groundwater Technology BV Remediation plan: Ecorem/ABO Remediation research: Ecorem/ABO Competent authority: OVAM Contact information stake holders: Groundwater Technology BV

Lessons learned: Monitoring of site boundries will prevent incoming migration of off-site located contaminants Remarks: This project was performed in a highy busy industrial wood production and storage facility.

Related techniques: Pump & treat

Related HIP-pilots: