The first step in the fight against contaminated sites on the former site of the paul brickyard is still comparatively inexpensive. At its meeting on monday evening, the city council approved a groundwater renovation project that will cost 11,604 euros and take three years to complete. The contract for this work went to EH-wassertechnik gmbh in kirchberg/jagst.
The specialist company will extract the groundwater and pump it through activated carbon filters and then into the sewerage system initiate. This is intended to prevent further spread of the pollutants in the area of the source of the damage. "After three years, it will then be necessary to determine whether and to what extent further macceptances are required. They could cost several hundred thousand euros", mayor ernst stross (SPD) made clear.
The contamination of the soil was caused by a tar oil tank from the former paul brickyard, whose land the city bought a good 30 years ago has taken over. The tank was removed, but apparently over 4000 liters of oil had already entered the earth by then. The company B& O concept was commissioned last year to investigate soil and groundwater contamination and found hydrocarbons as residues of the ols.
The source of the damage, which is roughly located under the now outsourced workshop of the bauhof, has a diameter of twelve to 15 meters. Contamination of the earth kingdom begins at a depth of about four meters and reaches about 10.50 meters. Not only the building yard area is affected, but also a part of the municipal utility area.
Dredging or sealing
berthold bangert of the contractor B& O concept spoke out at the city council meeting on 28. January for a remediation of the contaminated site. This could be done by excavating and disposing of the soil, with demolition of the building, or by sealing the affected area with sheet pile walls. The costs for both variants were roughly estimated at 500,000 euros by the expert.
SPD city councillor gregor schmid recalled his concerns on monday evening that pollutants could enter the catchment area of the kohlbrunnen well. He suggested a dye test to exclude pollution of the water. City builder detlef mohr explained that instead of a paint test, samples could be taken from the coal well on a regular basis. "We could do that once every six months", the city engineer suggested.
In this context, mayor stross also referred to an assessment by berthold bangert. According to this, water close to the surface would be used for the irrigation of the schrebergarten below. Coming from a depth of about three to four meters, this water is not contaminated, according to bangert.
Relocation remains an issue
on monday evening no topic was the future of the building yard and the public utility company. At the meeting in january, it was still suggested that the responsible parties should consider alternative sites for the remediation of contaminated sites with the demolition of buildings.
The mayor confirmed on tuesday that a relocation of the building yard and the public utilities is not off the table. In the meantime, a number of potential properties have already been inspected.