Summary

Case submitted by: SITA Remediation
Country: Netherlands
Built-up site?: Yes
Soil type: Layerd soil, clay/peat/sand
Follow-up required?: Yes, active remediation still has to take place
Treated contamination:
Chlorinated Volatile Organic Compounds (CVOC)
Mineral oil
Volatile aromats, including benzene (BTEX)
Volatile aromats, excluding benzene (BTEX)
Benzene
The target substances are primarily CVOC and benzene, but other mobile substances are treated simultaneously
Medium contamination:
Soil/pure product
Ground water
Dimension contamination: 7000 m3
Remediation goal: The goal of the pilot phase is to gather sufficient data to improve the remediation design for phase 2 and to draw a remediation plan.
Remediation goal achieved?: Yes
Initial and final concentration or load removal:
PCE start concentration: 13.000 ug/l (I – MF2 deep) end concentratie: 1,9 ug/l(I – MF2 deep)
TCE start concentration: 21.000 ug/l (I – MF2 deep) end concentration: 2,5 ug/l(I – MF2 deep)
CIS start concentration: 41.000 ug/l (I – MF2 deep) / 22.000 ug/l (U – MF8 shallow) end concentration: 16.000 ug/l (I – MF2 deep) / 0,5 ug/l (U – MF8 shallow)
Vinyl Chloride start concentration: 9.000 ug/l (I – MF3 deep) / 4.500 ug/l (U – MF8 shallow) end concentratie: 6.900 ug/l (I – MF3 deep) / 0,8 ug/l (U – MF8 shallow)
Active remediation phase: October 1, 2010 till July 31, 2011 (pilot)
Passive remediation phase: Expected period: January 1, 2016 till July 1, 2016
Added reports:

In-situ remediation technique: ,

Case detailed information

General information
Project name: ISCO Defensie-eiland Woerden, remediation CVOC, mineral oil and BTEX*** Case submitted by: SITA Remediation Contact: Pim Vis Address: Postbus 40221, 3504 AA Utrecht Telephone number: +31 30 2470911 Email-address: info@sitaremediation.com
Location
Country: Netherlands City/region/county: Woerden/Northwest Utrecht/Utrecht (future) use of location: Residential area with cultural building, parking lot etc. Built-up location during the active remediation phase?: Yes
Technique
Explanation technique: For the pilot: injection with vertical injection filters and two oxidants: Natriumpermanganate and stable Fentons reagens (used in different working areas) Also other remediation techniques applied?: No After care needed?: Yes, active remediation still has to take place Rationale for the chosen technique: The location "Intendance Woerden (Defensie-eiland)" was used as a military complex during 1880-2001; especially for washing, drying, rinsing, repairing and storage of military equipment made of textiles. In a chemical laundry textiles were cleaned using TCE and PCE. The laundry has been relocated three times. Furthermore several subsurface and surface storage tanks were used, especially for storage of oil products. Due to the historical activities contamination has occurred with mineral oil, volatile aromats and CVOC. The redevelopment of this location has been the inducement for remediation and to prepare the location for the new future utilization. Due to the integral approach of remediation and redevelopment in combination with the desire to do this as soon as possible, the main techniques that were chosen, are: excavation, pump & treat and in-situ chemical oxidation (ISCO). As a preparation for the second phase of the remediation the techniques of pump & treat and ISCO were applied in a pilot.
Contamination
Treated contaminant(s): Chlorinated Volatile Organic Compounds (CVOC) Mineral oil Volatile aromats, including benzene (BTEX) Volatile aromats, excluding benzene (BTEX) Benzene The target substances are primarily CVOC and benzene, but other mobile substances are treated simultaneously Contaminant phase: Soil/pure product Ground water Size contamination: 7000 m3 Depth contamination: 12 meters below ground level
Soil
Soil type: Layerd soil, clay/peat/sand Saturated/unsaturated zone?: Saturated zone Unsaturated zone Permeability: > 0,1 meter/day. Determined with a pump test Flow velocity or gradient groundwater: 0,5 meter per day
Result, duration, expense
Remediation goal: The goal of the pilot phase is to gather sufficient data to improve the remediation design for phase 2 and to draw a remediation plan. Remediation goal achieved?: Yes Initial and final concentration and load removal: PCE start concentration: 13.000 ug/l (I - MF2 deep) end concentratie: 1,9 ug/l(I - MF2 deep) TCE start concentration: 21.000 ug/l (I - MF2 deep) end concentration: 2,5 ug/l(I - MF2 deep) CIS start concentration: 41.000 ug/l (I - MF2 deep) / 22.000 ug/l (U - MF8 shallow) end concentration: 16.000 ug/l (I - MF2 deep) / 0,5 ug/l (U - MF8 shallow) Vinyl Chloride start concentration: 9.000 ug/l (I - MF3 deep) / 4.500 ug/l (U - MF8 shallow) end concentratie: 6.900 ug/l (I - MF3 deep) / 0,8 ug/l (U - MF8 shallow) Active remediation phase: October 1, 2010 till July 31, 2011 (pilot) Passive remediation phase: Expected period: January 1, 2016 till July 1, 2016 Total costs passive/after care phase: € 132.625 (pilot) Total costs active phase: To be determined (after the pilot this phase will start)
Stakeholders
Problem owner: De Wasserij C.V. Post box 16 3350 AA Papendrecht Contractor: SITA Remediation Remediation plan: MWH b.v. Remediation research: Grontmij b.v. Competent authority: Province of Utrecht Contact information stake holders: Advisor of the municipality of Woerden: Omgevingsdienst regio Utrecht Postbus 461 3700 AL Zeist
Additional information
Lessons learned: The activities of the pilot have not resulted in undesired spreading of contaminants outside the working areas. Within the working areas there were changes in concentration of the contaminants (increase and decrease). The initial data and the data of the pump test and ISCO test, and also the data during the activities show that the concentrations of contaminants in the ground water fluctuate much. Due to this fluctuation the results of the pilot phase are difficult to determine. During the ISCO test field parameters provide better information about the influence of the ISCO-system. Also the in- and outflow data of the pump test provide insight in the quality of the ground water and the efficiency of the treatment. The discharge quality demands were not exceeded. During the initial and final investigations there were concentrations detected above the treatment norms for CVOC, but they were not as high as was expected. The buffering capacity and the matrix demand of the soil are, due to presence of much shell remnants, high. The application of classic Fentons reagens is therefore not realistic. That's why stable Fentons reagens was used. The matrix demand of the soil for permanganate is moderate and therefore permanganate could be used. However, on this location and the given requirements chemical oxidation by means of Fentons reagens was more suitable. Remarks:
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