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- Brinkhoff, Petra, 1973
(författare)
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Economic Project Risk Assessment for Sustainable Choice Of REmediation (SCORE) in Construction Projects
- 2014
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Contamination of soil and/or groundwater is a problem all over the world. There is a desire from politicians and the supervisory authorities to tackle the contamination problem in order to protect future generations. Remediation, in the past considered sustainable in itself has in recent years been debated in regard to the possible negative effects such as greenhouse gas, dust emission, waste generation and risks of traffic accidents. Construction companies come into contact with contamination in various kinds of projects, e.g. construction of houses, roads and bridges. Remediation projects are high-risk projects due to the many uncertainties regarding issues such as scope, quality, time and cost and an inability to handle them. This thesis presents a Project Risk Assessment (PRA) method, based on the established ISO standard of risk management, developed for project owners, e.g. construction companies. The method identifies, quantifies, analyses and evaluates project risks in remediation projects. The suggested method is probabilistic and includes uncertainty analysis of input variables based on expert judgment. A stepwise procedure and a computer based tool (PRA tool) were developed to facilitate the project risk assessment. The PRA method was developed within a sustainability assessment framework called SCORE (Sustainable Choice Of REmediation), but is also viable as a standalone tool for remediation projects. Assessment of project risks in monetary terms is part of a company’s financial analysis and in SCORE it is included in the economic domain as part of a cost-benefit analysis (CBA) of societal profitability. PRA and SCORE are in line with current trends and work on sustainability in construction companies, such as the use of certification systems like BREEAM, LEED and CEEQUAL. The PRA method is applied on a case study: an old paint factory which is being redeveloped into a residential area. The result of the case study application shows which alternative has the lowest mean risk cost, the highest probability to have the lowest risk cost and how the risk costs are distributed among the project risk categories. In addition, most importantly, helps the user to prioritise between risk-reducing measures. The PRA is a structured and transparent method for handling project risks and an important part of a sustainability assessment of remediation alternatives. It is beneficial to the risk management team in remediation projects and could in the future advantageously be further developed for use in larger infrastructure projects.
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| 3. |
- Brinkhoff, Petra, 1973, et al.
(författare)
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Economic Project Risk Assessment in Remediation Projects Prior to Construction: Methodology Development and Case Study Application
- 2015
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Ingår i: Remediation. - : Wiley. - 1051-5658 .- 1520-6831. ; 25:2, s. 117-138
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Tidskriftsartikel (refereegranskat)abstract
- Probabilistic economic analysis, including uncertainty of probabilities and consequences of project risks, is not widely used in remediation projects. This article presents a project risk assessment (PRA) method to identify, quantify, and analyze risks in remediation projects. The suggested method is probabilistic and includes uncertainty analysis of input variables based on expert judgment. It was originally developed as a part of a sustainability assessment tool, but is viable as a stand-alone tool for remediation projects. The method is applied to a case study: a former paint factory that is being redeveloped into a residential area. The PRA method is used for analyzing and comparing the project risks associated with four remediation options, all including excavation but with different degrees of onsite treatment. The result of the case study application shows which alternative has the lowest mean risk cost, the highest probability to have the lowest risk cost, and how the risk costs are distributed, but also, importantly, helps the user to prioritize between risk-reduction measures.
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| 6. |
- Ek, Kristine, 1975, et al.
(författare)
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A harmonized method for automatable life cycle sustainability performance assessment and comparison of civil engineering works design concepts
- 2020
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Ingår i: IOP Conference Series: Earth and Environmental Science. - : IOP Publishing. - 1755-1307 .- 1755-1315. ; 588:5
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Konferensbidrag (refereegranskat)abstract
- The life cycle sustainability performance of civil engineering works is increasingly important. The possibility to influence the sustainability of a project design is larger in the conceptual stage than in later stages. Better-informed decisions regarding design choices’ impact on sustainability can be made by comparing conceptual project designs based on an assessment of their life cycle sustainability performance. It is essential that concepts are assessed in a harmonized way and compared impartially. Current standards provide the general framework for the assessment of sustainability performance, but do not give detailed guidance on calculation of sustainability indicators and their aggregation. Since design in automated systems is becoming increasingly common, there is a growing need for machine-readable data and automatable assessment methods. Assessment methods which can be applied using open-access data is important to achieve fair competition. This paper aims to provide a method for life cycle sustainability performance assessment and comparison of civil engineering works design concepts, possible to apply using open-access Environmental Product Declarations (EPDs) and life cycle assessment (LCA) data. The purpose is to enable fair and automatable sustainability assessments of design concepts, to facilitate impartial comparisons of such assessments as a basis for choosing sustainable designs. A literature review of relevant standards and scientific papers on sustainability assessment of construction and civil engineering works was performed. A harmonized, fair and automatable method for life cycle sustainability assessment and comparison of civil engineering works design concepts, well-suited for optimization purposes, is presented. However, the aim currently limits categories and indicators possible to include. The proposed method includes guidance on the calculation of environmental, social and economic indicators, based on LCA, life cycle costing (LCC) and external costs, and aggregation using normalisation and weighting factors of the Product Environmental Footprint (PEF). The proposed method allows for an impartial comparison of the sustainability of design concepts, resulting in better-informed decisions.
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| 7. |
- Ek, Kristine, 1975, et al.
(författare)
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Life Cycle Sustainability Performance Assessment Method for Comparison of Civil Engineering Works Design Concepts: Case Study of a Bridge
- 2020
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Ingår i: International Journal of Environmental Research and Public Health. - : MDPI AG. - 1661-7827 .- 1660-4601. ; 17:21, s. 1-34
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Tidskriftsartikel (refereegranskat)abstract
- Standardized and transparent life cycle sustainability performance assessment methods are essential for improving the sustainability of civil engineering works. The purpose of this paper is to demonstrate the potential of using a life cycle sustainability assessment method in a road bridge case study. The method is in line with requirements of relevant standards, uses life cycle assessment, life cycle costs and incomes, and environmental externalities, and applies normalization and weighting of indicators. The case study involves a short-span bridge in a design-build infrastructure project, which was selected for its generality. Two bridge design concepts are assessed and compared: a concrete slab frame bridge and a soil-steel composite bridge. Data available in the contractor’s tender phase are used. The two primary aims of this study are (1) to analyse the practical application potential of the method in carrying out transparent sustainability assessments of design concepts in the early planning and design stages, and (2) to examine the results obtained in the case study to identify indicators in different life cycle stages and elements of the civil engineering works project with the largest impacts on sustainability. The results show that the method facilitates comparisons of the life cycle sustainability performance of design concepts at the indicator and construction element levels, enabling better-informed and more impartial design decisions to be made.
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| 8. |
- Ek, Kristine, 1975, et al.
(författare)
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Multi-criteria decision analysis methods to support sustainable infrastructure construction
- 2019
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Ingår i: IABSE Symposium, Guimaraes 2019: Towards a Resilient Built Environment Risk and Asset Management - Report. ; , s. 1084-1091
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Konferensbidrag (refereegranskat)abstract
- The construction of infrastructure projects represents a large sustainability impact, both positive and negative. Increased positive and reduced negative impacts can be achieved through better design and planning of the construction. To make more sustainable choices, well‐defined predictive sustainability assessment methods are required. Multi‐criteria decision analysis (MCDA) is a well-suited method for predictive sustainability assessment. This paper evaluates two MCDA methods for sustainability assessment of infrastructure construction and exemplifies their application with two case studies. The aim of this paper is to discuss if the methods are suitable for identifying the most sustainable alternative during the procurement process of an infrastructure project. It is recommended that MCDA methods are further developed to comply with the recently published EN standard on sustainability assessment of civil engineering works.
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| 9. |
- Rosen, Lars, 1962, et al.
(författare)
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Cirkulär hantering av förorenade massor. Utveckling av metod för ökad återvinning
- 2020
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- Land development, land remediation and infrastructure projects deal with large quantities of contaminated soil masses. Only a small part of the masses is recycled after treatment and a large part is deposited. At the same time, large quantities of new soil and rock materials must be quarried for construction work. An increased recycling of contaminated masses that is environmentally sound and safe from a human health perspective would make an important contribution to the improved resource management that characterizes a circular economy. This would lead to reduced transports, reduced volumes of deposited waste and a more sustainable management of contaminated masses. The project has analyzed various instruments in society with a view to examining the obstacles and opportunities for increased recycling of contaminated soil masses. The socio-economic benefits to society with an increased recovery of contaminated soil masses have been described in general terms. A method has been developed to provide different actors with a tool for classifying the suitability of soil masses for environmentally- and health-safe reuse. Such a method provides greater competitiveness of entrepreneurs with the ability and knowledge to carry out such recycling. The overall conclusion of this work is that there are significant potential socio-economic benefits from an increased recovery of contaminated soil masses. Several possible measures have been identified that could be useful to lead to an increase in the recovery of contaminated soil slabs in society: • Better adaptation of the environmental quality requirements of soil masses to the actual land use of the area where recycled masses can be potentially used • Reduced administration for using recycled masses • Increase the allowed storage time before disposal • Increase the requirements for treatment of masses before disposal • Introduce taxes on masses that are possible to pre-treat before disposal • Introduce landfill tax and increase landfill fees for inert soil masses • Increased on-site treatment (in situ and ex situ) • Introduce more innovative procurement and choice between execution or turnkey contracting • Calculate key figures for the recycling of contaminated soil masses • Develop and apply a standardized and well-founded classification of different the environmental and technological potential of masses for recycling. A proposed method has been developed and described in this study. Recycling of soil masses thus requires consideration of a variety of factors. The focus of the classification methodology developed here is on the environmental and technical characteristics of the soil mass. However, as described above, for the soil mass to be recycled also conditions other than the environmental and technical characteristics of the masses need to be fulfilled. We therefore propose that the classification of soil masses be seen as part of a step-by-step process in which different actors in society must act in order for increased recycling to be possible. We propose that the step-by-step process of circular management of contaminated masses, as well as for other types of waste, should, as far as possible, be based on the so-called “waste hierarchy”. In order to promote an increased degree of recycling, some efforts have been proposed that different actors can implement within the different levels of the waste hierarchy. It has not been possible to carry out a full analysis of opportunities for the various actors, but the proposals should be seen as a basis for a further development.
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| 10. |
- Rosen, Lars, 1962, et al.
(författare)
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SCORE: A novel multi-criteria decision analysis approach to assessing the sustainability of contaminated land remediation
- 2015
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Ingår i: Science of the Total Environment. - : Elsevier BV. - 0048-9697 .- 1879-1026. ; 511, s. 621-638
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Tidskriftsartikel (refereegranskat)abstract
- The multi-criteria decision analysis (MCDA) method provides for a comprehensive and transparent basis for performing sustainability assessments. Development of a relevant MCDA-method requires consideration of a number of key issues, e.g. (a) definition of assessment boundaries, (b) definition of performance scales, both temporal and spatial, (c) selection of relevant criteria (indicators) that facilitate a comprehensive sustainability assessment while avoiding double-counting of effects, and (d) handling of uncertainties. Adding to the complexity is the typically wide variety of inputs, including quantifications based on existing data, expert judgements, and opinions expressed in interviews. The SCORE (Sustainable Choice Of REmediation) MCDA-method was developed to provide a transparent assessment of the sustainability of possible remediation alternatives for contaminated sites relative to a reference alternative, considering key criteria in the economic, environmental, and social sustainability domains. The criteria were identified based on literature studies, interviews and focus-group meetings. SCORE combines a linear additive model to rank the alternatives with a non-compensatory approach to identify alternatives regarded as non-sustainable. The key strengths of the SCORE method are as follows: a framework that at its core is designed to be flexible and transparent; the possibility to integrate both quantitative and qualitative estimations on criteria; its ability, unlike other sustainability assessment tools used in industry and academia, to allow for the alteration of boundary conditions where necessary; the inclusion of a full uncertainty analysis of the results, using Monte Carlo simulation; and a structure that allows preferences and opinions of involved stakeholders to be openly integrated into the analysis. A major insight from practical application of SCORE is that its most important contribution may be that it initiates a process where criteria otherwise likely ignored are addressed and openly discussed between stakeholders.
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