Summary
Case submitted by: Groundwater Technology BV
Country: Netherlands
Built-up site?: Yes
Soil type: Clay
Follow-up required?: No
Treated contamination: Volatile hydrocarbons, excluding benzene (TEX)
Medium contamination: Soil/ pure product and groundwater
Dimension contamination: 12000 m3
Remediation goal: Stable end situation
Remediation goal achieved?: Yes
Initial and final concentration or load removal: Xylenes: Initial concentration 5000 ug/l, final concentration < d -700 ug/l
Active remediation phase: 01-01-2003 to 01-12-2012
Passive remediation phase: –
Added reports:
tiel_beschikking_gt.pdf
tiel_evaluatierapport_gt.pdf
In-situ remediation technique: Multi-phase extraction
Case detailed information
General information
Project name: Tiel: TEX (xylenes)
Case submitted by: Groundwater Technology BV
Contact: Yvo Veenis
Address: Postbus 12115, 3004 GC Rotterdam
Telephone number:
Email-address: YVE@gtbv.nl
Location
Country: Netherlands
City/region/county: Tiel, Gelderland
(future) use of location: Industry
Built-up location during the active remediation phase?: Yes
Technique
In situ saneringstechniek: Multi-phase extraction
Explanation technique: This remediation comprises the phased remediation of an active industrial facility in the period 2003 – 2012. The remediation design and implementation were provided by Groundwater Technology. The remediation of the last phase was undertaken on a ‘lump sum to closure” contract basis. Four phases of remediation were implemented:Explanation technique: This remediation comprises the phased remediation of an active industrial facility in the period 2003 – 2012. The remediation design and implementation were provided by Groundwater Technology. The remediation of the last phase was undertaken on a ‘lump sum to closure” contract basis. Four phases of remediation were implemented:
- Pilot remediation on the smallest spot to produce ‘proof of principle’ for the remediation technique (multi-phase extraction)
- Remediation of a shallow hotspot through excavation inside one of the buildings;
- Remediation of the first core zone underneath the industrial facility through multi-phase extraction;
- Remediation of the second core zone underneath the industrial facility through multi phase extraction;
Contamination
Treated contaminant(s): Volatile hydrocarbons, excluding benzene (TEX)
Contaminant phase: Soil/ pure product and groundwater
Size contamination: 12000 m3
Depth contamination: 5 m-mv
Soil
Soil type: Clay
Saturated/unsaturated zone?: Saturated zone
Permeability: <0,01 m/day, estimation based on bore logs
Flow velocity or gradient groundwater: -
Result, duration, expense
Remediation goal: Stable end situation
Remediation goal achieved?: Yes
Initial and final concentration and load removal: Xylenes: Initial concentration 5000 ug/l, final concentration < d -700 ug/l
Active remediation phase: 01-01-2003 to 01-12-2012
Passive remediation phase: -
Total costs passive/after care phase:
Total costs active phase: € 1.100.000 ex VAT
Stakeholders
Problem owner: Confidential
Contractor: Groundwater Technology
Remediation plan: Groundwater Technology
Remediation research: Groundwater Technology
Competent authority: Province of Noord Holland
Contact information stake holders: Groundwater Technology BV
Additional information
Lessons learned: In Situ remediation of xylenes is feasible in low permeability clay. Subsidence can be prevented by careful process management.
Remarks:
Related techniques and HIP-pilots
Related techniques: Multi-phase extraction
Related HIP-pilots: HIP-pilot ‘Acoustic remediation’