Summary

Case submitted by: NTP Milieu
Country: The Netherlands
Built-up site?: No, company was first dismantled and demolished.
Soil type: Layered soil; clay/peat/sand
Follow-up required?: Yes, monitoring plume for the benefit of determanation of a stable final situation.
Treated contamination: CVOC
Medium contamination: Soil/pure product and groundwater
Dimension contamination: Soil volume 175.000 m3 of which actively treaded 35.000 m3
Remediation goal:
A stable final situation; obtain a final concentration
PCE concentration: 20 µg/l
TCE concentration: 262 µg/l
Cis concentration: 10 µg/l
VC concentration: 2,5 µg/l
Remove load percentage: > 99%
Remediation goal achieved?: Yes, for source area
Initial and final concentration or load removal:
PCE initial concentration: 3.400 µg/l; final concentration: 1,8 µg/l
TCE initial concentration: 6.300 µg/l; final concentration: 0,5 µg/l
Cis initial concentration: 29.000 µg/l; final concentration: 4 µg/l
VC inital concentration: 3.300 µg/l; final concentration: 21 µg/l
Active remediation phase: Juni 2007 until juni 2009
Passive remediation phase: The passive fase is not yet completed. Expacted periode of realization: juli 2009 until juli 2012
Added reports:
referentieproject amefa 2011 en beschikkingen grond en bron.pdf

Case detailed information

General information
Project name: Apeldoorn (Deventerstraat 323a): CVOC *** Case submitted by: NTP Milieu Contact: De heer W.J.M. Havermans Address: Postbus 6280, 7503 GG Enschede Telephone number: +31 (0)53 4614905 Email-address: w.havermans@ntp-enschede.nl
Location
Country: The Netherlands City/region/county: Deventerstraat 323a te Apeldoorn, provincie Gelderland (future) use of location: Residential Built-up location during the active remediation phase?: No, company was first dismantled and demolished.
Technique
Explanation technique: Also other remediation techniques applied?: Yes, the excavation of the hotspots of soil contaminated with metals and mineral oil and CVOC-contaminated peat. An infiltration system has been constructed consisting a bed with iron granules which is used to infiltrate extracted groundwater again. After care needed?: Yes, monitoring plume for the benefit of determanation of a stable final situation. Rationale for the chosen technique: Stimulated anaerobic degradation is the best option for the degradation of CVOC in groundwater and best suitable for a soil with a peat layer of (locally) about 1 m thickness.
Contamination
Treated contaminant(s): CVOC Contaminant phase: Soil/pure product and groundwater Size contamination: Soil volume 175.000 m3 of which actively treaded 35.000 m3 Depth contamination: 15 m below surface
Soil
Soil type: Layered soil; clay/peat/sand Saturated/unsaturated zone?: Saturated and unsaturated zone Permeability: > 0,1 m/day; based on field data. Flow velocity or gradient groundwater: 4 m/km; 25 m/year
Result, duration, expense
Remediation goal: A stable final situation; obtain a final concentration PCE concentration: 20 µg/l TCE concentration: 262 µg/l Cis concentration: 10 µg/l VC concentration: 2,5 µg/l Remove load percentage: > 99% Remediation goal achieved?: Yes, for source area Initial and final concentration and load removal: PCE initial concentration: 3.400 µg/l; final concentration: 1,8 µg/l TCE initial concentration: 6.300 µg/l; final concentration: 0,5 µg/l Cis initial concentration: 29.000 µg/l; final concentration: 4 µg/l VC inital concentration: 3.300 µg/l; final concentration: 21 µg/l Active remediation phase: Juni 2007 until juni 2009 Passive remediation phase: The passive fase is not yet completed. Expacted periode of realization: juli 2009 until juli 2012 Total costs passive/after care phase: € 50.000,- Total costs active phase: € 350.000 ,-
Stakeholders
Problem owner: Apeldoornse messenfabriek AMEFA BV Contractor: NTP Milieu Enschede Remediation plan: KWA bedrijfsadviseurs / NTP Milieu Enschede Remediation research: KWA bedrijfsadviseurs / NTP Milieu Enschede Competent authority: Provincie Gelderland Contact information stake holders: De heer W. Havermans NTP Milieu
Additional information
Lessons learned: A good example of a successful approach of stimulated anaerobic degradation of CVOC. Downstream extraction of groundwater and upstream infiltration of groundwater, periodically enriched with the substrate EHC-A (Adventus), went well. Infiltration partially through an iron barrier with zero valent iron that was built on the bottom of the wells of the excavation sites. Active remediation period was finished within two years. Remarks: Despite extensive excavation there were still high concentrations of Cis in the groundwater but they rapidly declined because of the stimulated degradation.
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