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The reports cover a five-year period from 2003 to 2007, from planning work to construction works on the residential area in Nystulia, which was hit by the catastrophic landslide on the night of Wednesday, December 30.
NGI Director Lars Andersen says the review indicates that the construction work has been carried out in accordance with current requirements:
– NGI provides advice, but the responsibility for carrying out the security measures does not lie with us. From what we can see from the review, this work has been done in accordance with the current requirements of the Planning and Construction Act and other guidelines. A more comprehensive review of the case could provide answers to this, says NGI CEO Lars Andresen.
Known issue
NGI states that prior to development, there were significant deposits of rapid clay in the area.
In the Nystulia area, therefore, there was a requirement to improve stability, and various security measures are outlined as part of the action plan in the reports, it is stated.
After the municipality approved the zoning plan, NGI worked for the developer, Odd Sæther. This work is documented in NGI’s Friday night notes, according to Andersen.
Classified insurance
Andersen gives the following conclusion:
– Assuming security measures were implemented, stability in the area was improved. Hazard zone maps that have been made after development show that the risk of landslides in this area was described as low, says the director of NGI.
The latest notes that NGI has now released, from August 2007 regarding the Nystulia development, show a description of a landslide in fulfilled masses in the development area, as a result of large amounts of precipitation and variable quality in the masses.
According to the memo, this has been excavated for drainage and can then be used as planning masses.
Plan a new quick clay poll on Ask in 2021
The memorandum concludes with a general assessment of the stability conditions:
“The planning work done for Nystulia has resulted in a significant improvement in the overall stability for the entire area between the Ask center and Finstadbekken, including Ingelstun and other old buildings. The area now has satisfactory security. “
With Nystulia
The total of eleven reports reveal details of the security measures that were planned and executed.
Experts: They thought the highway would stop the landslides
NGI claims that for several decades they have investigated soil conditions in the Gjerdrum municipality. In the area that is now evacuated, it is various construction cases where NGI and other stakeholders have conducted motive assessments. These reports are not part of the documents NGI releases on Friday.
Too early to tell
Andersen emphasizes that living clay is basically stable masses that we build residential houses on in this country.
– What is the cause of the landslide that has hit Gjerdrum? It is too early to say anything about it. The police have opened an investigation and a thorough review of the incident and the course of events will be carried out. This will be an extensive and thorough job. Hopefully we’ll get answers here about causation and what we can all learn from it. Out of respect for future work, therefore, we do not wish to comment further on the course of events and evaluations carried out previously, says NGI Director Lars Andresen.
