Summary

Case submitted by: Groundwater Technology
Country: Nederland
Built-up site?: Yes
Soil type: Layered soil: clay/peat
Follow-up required?: No
Treated contamination: vinyl acetaat monomer (VAM)
Medium contamination: Soil/pure product and groundwater
Dimension contamination: 750 m3 soil and 750 m3 groundwater
Remediation goal:
Complete removal because of care responsibility
Remediation goal achieved?: Yes
Initial and final concentration or load removal:
VAM initial concentration: 3700 mg/l; final concentration: <1 mg/l
Active remediation phase: 01/07/2006 until 31/12/2007
Passive remediation phase:

In-situ remediation technique: ,

Case detailed information

General information
Project name: Rotterdam-Botlek: VAM-spill* Case submitted by: Groundwater Technology Contact: Robert Heling Address: Postbus 12115 3004 GC Rotterdam Telephone number: +31 10 238 2859 Email-address: rhg@gtbv.nl
Location
Country: Nederland City/region/county: Rotterdam-Botlek (future) use of location: Industrial Built-up location during the active remediation phase?: Yes
Technique
In situ saneringstechniek: ,
Explanation technique: Also other remediation techniques applied?: No After care needed?: No Rationale for the chosen technique:
Contamination
Treated contaminant(s): vinyl acetaat monomer (VAM) Contaminant phase: Soil/pure product and groundwater Size contamination: 750 m3 soil and 750 m3 groundwater Depth contamination: 4 m below surface
Soil
Soil type: Layered soil: clay/peat Saturated/unsaturated zone?: Saturated zone and unsaturated zone Permeability: <0,01 m/day Flow velocity or gradient groundwater:
Result, duration, expense
Remediation goal: Complete removal because of care responsibility Remediation goal achieved?: Yes Initial and final concentration and load removal: VAM initial concentration: 3700 mg/l; final concentration: <1 mg/l Active remediation phase: 01/07/2006 until 31/12/2007 Passive remediation phase: Total costs passive/after care phase: Total costs active phase: confidential
Stakeholders
Problem owner: Contractor: Groundwater Technology Remediation plan: opgesteld door Groundwater Technology Remediation research: opgesteld door Groundwater Technology Competent authority: DCMR Contact information stake holders:
Additional information
Lessons learned: By combining research with construction of the remediation system, the storage tank was available again for repair work within 1 week after boost. Inconvenience to the customer was reduced reduced to minimum. With such volatile compounds as VAM, for analysing the result alternative techniques are required since soil samples are not reliable. For soil samples in which contamination is visualy present, laboratory analyses result in show values below detection limit. Remarks: Leakage was caused by a faulty tank bottom. During turmoil only visable part of outer tank was removed through manual excavation. After jacking it was proposed by the consultant to axcavate area under tank tank mound as well. We have proposed an in situ approach to avoid uneven settlements. This caused also huge cost savings (compared to manual digging under tank because of safety), accelerating method (1 week construction system), and greater security for customer (corrections). After repair of the vessel, in situ remediation was performed during one year at a lump sum payment.
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