Summary

Case submitted by: Verhoeve Milieu & Water
Country: Netherlands
Built-up site?: Yes
Soil type: Layered soil: clay/peat/sand
Follow-up required?: Yes, namely monitoring
Treated contamination: Cyanide: Thiocyanate
Medium contamination: Groundwater
Dimension contamination: 12.000 m3
Remediation goal: Final concentration thiocyanate 750 µg/l
Remediation goal achieved?: Yes
Initial and final concentration or load removal: Contaminant thiocyanate
Initial concentration 50.000 µg/l, final concentration 500 ug/l
Active remediation phase:
Passive remediation phase:
Added reports:
349007 oostburg (revisie)

In-situ remediation technique:

Case detailed information

General information
Project name: Oostburg: ISCO; Thiocyanate Case submitted by: Verhoeve Milieu & Water Contact: Art Lobs Address: Aventurijn 600 Dordrecht Netherlands Telephone number: + 31 78 6520070 Email-address: a.lobs@verhoevemilieu.com
Location
Country: Netherlands City/region/county: Oostburg, Zeeland (future) use of location: Urban Area Built-up location during the active remediation phase?: Yes
Technique
In situ saneringstechniek:
Explanation technique: Injected with perozone (ozone/peroxide) during 12 months for source treatment. A rapid cleaning was required, due to new building acitivities. Injection is performed with 45 laminar spargepoints and 9 vapour air extraction wells. Also other remediation techniques applied?: No After care needed?: Yes, namely monitoring Rationale for the chosen technique: Source treatment for a large volume and in silty sand. Due to a failed pump & treat system, ISCO on gas-base was chosen.
Contamination
Treated contaminant(s): Cyanide: Thiocyanate Contaminant phase: Groundwater Size contamination: 12.000 m3 Depth contamination: 11 m-mv
Soil
Soil type: Layered soil: clay/peat/sand Saturated/unsaturated zone?: Saturated zone Permeability: 0,01-0,1 m/day determined by field data. Flow velocity or gradient groundwater:
Result, duration, expense
Remediation goal: Final concentration thiocyanate 750 µg/l Remediation goal achieved?: Yes Initial and final concentration and load removal: Contaminant thiocyanate Initial concentration 50.000 µg/l, final concentration 500 ug/l Active remediation phase: Passive remediation phase: Total costs passive/after care phase: € 50.000,- Total costs active phase: € 325.000,-
Stakeholders
Problem owner: Province Zeeland Contractor: Verhoeve Milieu& Water Remediation plan: ABO Remediation research: ABO Competent authority: Province Zeeland Contact information stake holders: ABO-Province Zeeland
Additional information
Lessons learned: Remarks: A small source occured in the top soil, which needed to be removed.
Related techniques and HIP-pilots