Summary

Case submitted by: NTP Milieu
Country: The Netherlands
Built-up site?: Yes
Soil type: Mainly sand, with a layered peat/clay soil
Follow-up required?: Yes, prove stable end situation
Treated contamination: Chlorinated Volatile Organic Compounds (CVOC)
Medium contamination: Soil/pure product and groundwater
Dimension contamination: 120.000 [m3]
Remediation goal: Stable final situation and:
final concentration:
contamination 1:PCEconcentration: 20 µg/l
contamination 2:TCEconcentration: 262 µg/l
contamination 3:Cis-DCE concentration: 10 µg/l
contamination 4:VC concentration: 2,5 µg/l
Load removal percentage: > 95%
Remediation goal achieved?: No, remediation in progress
Initial and final concentration or load removal:
Contamination 1:PCE initial concentration: 29.000 µg/l
Contamination 2:TCE initial concentration: 1.700 µg/l
Contamination 3:Cis initial concentration: 5.160 µg/l
Contamination 4:VC initial concentration: 250 µg/l
Active remediation phase: June 2006 until present day.
Passive remediation phase:
Added reports:
omschrijving veenhuizen 2011 en beschikking grond.pdf

 

Case detailed information

General information
Project name: Veenhuizen (Norgerhaven): CVOC *** Case submitted by: NTP Milieu Contact: De heer W.J.M. Havermans Address: Postbus 6280, 7503 GG Enschede Telephone number: +31 (0)53 461 49 05 Email-address: w.havermans@ntp-enschede.nl
Location
Country: The Netherlands City/region/county: Norgerhaven te Veenhuizen, provincie Drenthe (future) use of location: Residence, namely house of detention Built-up location during the active remediation phase?: Yes
Technique
Explanation technique: Direct injections of substrate and diffusion through groundwater circulation Also other remediation techniques applied?: After care needed?: Yes, prove stable end situation Rationale for the chosen technique: Stimulated anaerobic degradation is the best option for the degradation of CVOC in groundwater, and the most logical remediation option in the built environment.
Contamination
Treated contaminant(s): Chlorinated Volatile Organic Compounds (CVOC) Contaminant phase: Soil/pure product and groundwater Size contamination: 120.000 [m3] Depth contamination: 30 m below surface
Soil
Soil type: Mainly sand, with a layered peat/clay soil Saturated/unsaturated zone?: Saturated zone and unsaturated zone Permeability: > 0,1 m/day, based on field data Flow velocity or gradient groundwater: 1,0 m/km; 3 m/year
Result, duration, expense
Remediation goal: Stable final situation and: final concentration: contamination 1:PCEconcentration: 20 µg/l contamination 2:TCEconcentration: 262 µg/l contamination 3:Cis-DCE concentration: 10 µg/l contamination 4:VC concentration: 2,5 µg/l Load removal percentage: > 95% Remediation goal achieved?: No, remediation in progress Initial and final concentration and load removal: Contamination 1:PCE initial concentration: 29.000 µg/l Contamination 2:TCE initial concentration: 1.700 µg/l Contamination 3:Cis initial concentration: 5.160 µg/l Contamination 4:VC initial concentration: 250 µg/l Active remediation phase: June 2006 until present day. Passive remediation phase: Total costs passive/after care phase: Total costs active phase: € 437.000 ,-
Stakeholders
Problem owner: Rijksgebouwen dienst Contractor: NTP Milieu Enschede Remediation plan: NTP Milieu Enschede Remediation research: Grontmij Competent authority: Provincie Drenthe Contact information stake holders: De heer W.J.M. Havermans NTP Milieu
Additional information
Lessons learned: Project progress was delayed due to the effect of the administration of substrate to the soil which releases a lot of product enclosed under the building. PCE concentrations increased after the start of the groundwater remediation up to 90.000 ug / l. Subsequent deliveries has now stopped and the degradation progresses steadily. Infiltration of groundwater in the (fine sandy) aquifer proceeds very slowly. Remarks:
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