Case submitted by: Groundwater Technology BV
Country: Belgium
Built-up site?: Yes
Soil type: Layered soil: clay/peat/sand
Follow-up required?: No
Treated contamination: Chlorinated volatile organic compounds (CVOC)
Medium contamination: Groundwater
Dimension contamination: >500.000 m3
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 or 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
Added reports:
belgie_conformiteitsverklaring ovam.pdf
bsw jimco_zedelgem_eindevaluatieonderzoek_- bijlagen deel 1.pdf
bsw jimco_zedelgem_eindevaluatieonderzoek_- bijlagen deel 2.pdf
bsw jimco_zedelgem_eindevaluatieonderzoek_- bijlagen deel 3.pdf
bsw jimco_zedelgem_eindevaluatieonderzoek_-rapport.pdf
Zedelgem (Belgium): CVOC
Summary
In-situ remediation technique: Pump & treat
General information
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
Location
Country: Belgium
City/region/county: City of Zedelgem , Flanders
(future) use of location: Industry
Built-up location during the active remediation phase?: Yes
Technique
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.
Contamination
Treated contaminant(s): Chlorinated volatile organic compounds (CVOC)
Contaminant phase: Groundwater
Size contamination: >500.000 m3
Depth contamination: 25 [m –mv]
Soil
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
Result, duration, expense
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 ,-
Stakeholders
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
Additional information
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 and HIP-pilots
Related techniques: Pump & treat
Related HIP-pilots: