Stockholm Royal Seaport is an old industrial site with large areas that need to be remediated. The remediation is performed in line with site-specific benchmarks in accordance with guidelines and methodology of the Swedish Environmental Protection Agency.
Priority is given to local soil remediation, and reuse of excavated materials on site. In 2018, large amounts of excavated materials did not meet the quality requirements, hence the mass balance was lower than previous years.
The excavated materials that does not meet the quality requirements is transported offsite for remediation or final disposal, see pie chart 3.1. below. To date the remediated surface amounts to a total of 321,610 m2, which corresponds to 45 soccer fields.
All contractors sort their construction waste, and the majority goes to recycling, see Figure 3.1.
Dewatering of groundwater occurs when excavation take place below the groundwater table, in these cases water needs to be pumped and treated before discharged to Lilla Värtan .In 2018, 2,750 m3 of water was treated in the local water purification plant and discharged, this corresponds to a Olympic swimming pool.
|Etapp/xx||GK4||Brofästet||Norra 2||Västra||Norra 1|
|Area remediated, m²||321 610||39 410||18 200||26 400*||IU|
|Area remediated to date, %||25%||25%||22%||21%||IU|
|Excavated material, tonnes||2 000 000||136 360||49 240||355 800||1 440 000|
|Mass balance, reuse of materials, tonnes||775 000||17 560||13 840||136 870||600 000|
|Renat länsvatten, m³||IU||2 750||8 200||26 450||17 600*|
*Area remediated from 2016.
* March-December 2015.
Requirement maximum distance from door to sorting:
The average distance between the building entrances and a refuse chute is 29 metres, and 33 meters to the recycling room. Non-compliances have been reported for a small number of stairwells, and for urban townhouses, these were approved due to the neighbourhood’s design, and to facilitate waste removal. The recycling rooms are in most cases easily accessible The size of these rooms in Norra 2 is on average 0.42 m2 per apartment, and for Brofästet 0.44 m2 per apartment. See table 3.2. below.
The vacuum waste collection system, in combination with kitchen grinders, reduces both the amount of waste and the number of waste transports in the area. Residual waste collected by the vacuum system amounts to 212.6 kg/residence, compared to the 520 kg/residence Swedish average, according to Waste Sweden (Avfall Sverige).
None of the property developers complied with the requirement on construction waste (20 kg/m2 GFA), on average this resulted in 39 kg/m2 GFA. The property developers have not been sufficiently proactive in preventing and reducing the amount of construction waste. Deficiencies in quality assurance processes during the construction stage have contributed to damp materials that had to be disposed of. The evaluation has led to changing the requirement, that all future property developers will submit a waste management plan describing how they will achieve the 20 kg/m2 GFA target.
Requirements for building construction waste :
|Etapp/xx||Norra 2||Brofästet||Gasverket||Gasklocka 4||Västra||Norra 1|
|Norra 2||Brofästet||Gasverket Västra||Gasklocka 4||Västra||Norra 1|
|Residual waste (kg/apt) in vacuum waste collection systems||212,6 kg/apt||Not relevant||Not relevant||Not relevant||212,6 kg/apr||212,6 kg/apt|
|Paper (kg/apt) vacuum waste collection systems||32,8 kg/apt||Not relevant||Not relevant||Not relevant||32,8 kg/apt||32,8 kg/apt|
|Plastic (kg/apt) sopsug||20 kg/apt||Not relevant||Not relevant||Not relevant||20 kg/apt||20 kg/apt|
|Distance vacuum waste collection systems (m)||24||40||16||30||IU||IU|
|Distance recycling rooms (m)||27||50||22||0||IU||IU|
|Construction waste, BA (kg/GFA)||45,8||–||–||–||29,6||38,4|
The waste hierarchy is a priority order, which means firstly prevent waste, secondarily prepare for reuse and thirdly recycle material and so forth. The procedure applies provided that it is environmentally motivated and financially reasonable.