Summary

Case submitted by: A&G Milieutechniek bv
Country: The Neterlands
Built-up site?: Yes
Soil type: Layerd soil; clay/peat/sand
Follow-up required?: Yes, proving stable end situation (no distribution of contamination).
Treated contamination: CVOC and heavy metals
PCE is the primary product. The degradation products TCE, Cis, VC are also present.
Medium contamination: Soil/pure product and groundwater
Dimension contamination: 150.000 [m3]
Remediation goal: Stable final situation;
final concentration
PCE concentration: 40 ug/l
TCE concentration: 500 ug/l
cis-DCE concentration: 20 ug/l
VC concentration: 5 ug/l
Remediation goal achieved?: No, remediation is not yet completed
Initial and final concentration or load removal:
PCE initial concentration: 5000 ug/l
TCE initial concentration: 250 ug/l
Cis initial concentration: 250 ug/l
VC initial concentration: <5 ug/l
Active remediation phase: March 2001 until (probably) end of 2009
Passive remediation phase: The passive phase is not yet completed. Expected realization period: probably end of 2009 until unknown.

In-situ remediation technique:

Case detailed information

General information
Project name: Terneuzen: CVOC and heavy metals: enhanced anerobic biological degradation Case submitted by: A&G Milieutechniek bv Contact: dhr. W. Boekholt Address: Postbus 660 5140 AR Waalwijk Telephone number: +31 (0)416-344 044 +31 (0)416-344 080 Email-address:
Location
Country: The Neterlands City/region/county: Terneuzen/Zeeland (future) use of location: Residence Built-up location during the active remediation phase?: Yes
Technique
Explanation technique: Groundwater circulation with vertical infiltration and extraction filter at 3 depths. Infiltration of substrate (melasse) and nutrients. Also other remediation techniques applied?: Yes, prior to in situ remediation, the source has been removed as much as possible. After care needed?: Yes, proving stable end situation (no distribution of contamination). Rationale for the chosen technique: During initial remediation activities (excavation and groundwater extraction), those techniques seemed to be unsufficient to achieve the remediation goal. In consultation with the client it was decided to proceed on an in-situ remediation.
Contamination
Treated contaminant(s): CVOC and heavy metals PCE is the primary product. The degradation products TCE, Cis, VC are also present. Contaminant phase: Soil/pure product and groundwater Size contamination: 150.000 [m3] Depth contamination: 24 m below surface
Soil
Soil type: Layerd soil; clay/peat/sand Saturated/unsaturated zone?: Saturated zone and unsaturated zone Permeability: Flow velocity or gradient groundwater: a
Result, duration, expense
Remediation goal: Stable final situation; final concentration PCE concentration: 40 ug/l TCE concentration: 500 ug/l cis-DCE concentration: 20 ug/l VC concentration: 5 ug/l Remediation goal achieved?: No, remediation is not yet completed Initial and final concentration and load removal: PCE initial concentration: 5000 ug/l TCE initial concentration: 250 ug/l Cis initial concentration: 250 ug/l VC initial concentration: <5 ug/l Active remediation phase: March 2001 until (probably) end of 2009 Passive remediation phase: The passive phase is not yet completed. Expected realization period: probably end of 2009 until unknown. Total costs passive/after care phase: Total costs active phase: € 635.000,-
Stakeholders
Problem owner: Provincie Zeeland Contractor: A&G Milieutechniek bv Remediation plan: Remediation research: Competent authority: Provincie Zeeland Contact information stake holders: Tauw Dhr. H. van Kooten +31 (0)10 - 288 61 91
Additional information
Lessons learned: Remarks:
Related techniques and HIP-pilots