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Association (2012). Trail building and design. From website of the International Biking Association: IUCN, CORDIO & ICRAN (2008). Managing Marine and Coastal Protected Areas: A Toolkit for South Asia. IUCN, Gland, Switzerland and Bangkok, Thailand; CORDIO, Kalmar, Sweden; and ICRAN, Cambridge, UK. Klimaszewski, M. (1981). Geomorphology (in Polish). Warszawa: PAN. Marion, J.L. & Wimpey J. (2007). Environmental impacts of mountain biking: Science review and best practices. In P. Weber (Ed.), Managing Mountain Biking: IMBA’s Guide

., Haque N. Using life cycle assessment to evaluate some environmental impacts of gold production. Journal of Cleaner Production 2012:29-30:53-63. doi: 10.1016/j.jclepro.2012.01.042 [12] Liu F., Cai Q., Chen S., Chen S., Zhou W. A comparison of the consumption and carbon emissions for different modes of transportation in open-cut coal mines. International Journal of Mining Science and Technology 2015:25:261-266. doi: 10.1016/j.ijmst.2015.02.015 [13] Morrow III W. R., Hasanbeigi A., Sathaye J., Xu T. Assessment of energy efficiency improvement and CO2 emission reduction

also formed, which is the material for unbound layers in road construction. Therefore, the aim of the present study was to evaluate the potential use of the mixed aggregate (0/32 mm) from the EAF slag aggregate and natural aggregate as the unbound material for road construction from the environmental point of view. Different mixed aggregates were prepared and their environmental impacts were estimated by applying leaching tests. Materials and Methods Reagents Merck (Darmstadt, Germany) suprapur acids and Milli-Q water (Direct-Q 5 Ultrapure water system; Millipore

. Kemmelbach, Austria: Ing. Friedrich Bauer GmbH. 8 p. Lapčík, V. (2009). Notification according to Act No 100/2001 Coll., as amended, of project "Biogas station Kostice". Ostrava. 82 p. Decree No 341/2008 Coll., on details on biodegradable waste disposal. Pastorek, Z. (2008). Biogas - useful energy source or risky way of enterprise. Alternative Energy (magazine), No 3, pp. 26-28. (in Czech). Act No 100/2001 Coll., on environmental impact assessment and amending some acts (Act on Environmental Impact Assessment), as amended.

-tracer5-brasil.pdf . 18. Bandeira, J. V., Salim, L. H., Junqueira, M. V., & Barbosa, G. H. S. P. C. (2013). Environmental evaluation of the Paraibuna River downstream of Paciência SHP reservoir, after bottom discharges . Final report . CDTN/CETEC, Belo Horizonte. (R&D Project GT - 198 – CEMIG/ANEEL). 19. Bandeira, J. V., Salim, L. H., Ferreira, V. V. M., Junqueira, M. V., Barbosa, G. H. S. P. C., Carvalho, M. D., & Mota, H. R. (2012). Accretion of reservoirs, bottom discharge and evaluation of environmental impacts: case study of Paciência SHP, Paraibuna River, Minas

(a UNESCO World Heritage Site), to mention but a few. Fig. 1 Map of urban Bulawayo, showing the four stratums upon which fieldwork was based Source: Authors. The study adopted a quantitative design, in terms of which a structured self-administered questionnaire was used to collect the required data from the relevant households (positive economic impacts; negative economic impacts; positive sociocultural impacts; negative sociocultural impacts; positive environmental impacts; negative environmental impacts; the evaluation of tourism impacts; and general impacts

, A.V. & Usón, A.A. (2011). Life cycle assessment of building materials: Comparative analysis of energy and environmental impacts and evaluation of the eco-efficiency improvement potential. Building and Environment. Volume 46 (5), 1133-1140. [24] Dodoo, A., Gustavsson, L. & Sathre, R. (2009). Carbon implications of end-of-life management of building materials. Resources, Conservation and Recycling . Volume 53,276-286. [25] De Benedetto L. & Klemeš J. (2009). The Environmental Performance Strategy Map: an integrated LCA approach to support the strategic decision

References Defining an Acceptable Level of Environmental Impact [Online]. The global development research center (Tex.), [Accessed 14.12.2009.]. Available: Environmental Impact Assessment Regulations and Strategic Environmental Assessment Requirements , 2006. - Washington: The World Bank, 2006. Consideration of Cumulative Impacts in EPA Review of NEPA Documents , 1999. - U. S. Environmental Protection Agency, Office of Federal Activities, 1999. Considering Cumulative Effects Under the National Environmental

projects on the environment. 4. European Commission (2001), Guidance on EIA - Scoping, June 2001, Luxembourg: Offi ce for Offi cial Publications of the European Communities. 5. Jain, R.K., Urban, L.V., Stacey, G.S., Balbach H.E. and Webb M.D. (2001), Environmental Assessment, New York: McGraw-Hill. 6. Guinee J. B. (ed.) (2004), Handbook on Life Cycle Assessment. Operational Guide to the ISO Standards, New York, Boston, Dordrecht, London, Moscow: Kluwer Academic Publishers. 7. Glasson, J., Therivel, R., Chadwick, A. (2005), Introduction to environmental impact assessment

REFERENCES A rgent , R.M. – P erraud , J.M. – R ahman , J.M. – G rayson , R.B. – P odger , G.M. (2009): A new approach to water quality modelling and environmental decision support systems. Environmental Modelling & Software 24 (7): 809–818. B arker , A. – W ood , C. (1999): An evaluation of EIA system performance in eight EU countries. Environmental Impact Assessment Review 19: 387–404. B arthel , R. – J anisch , S. – S chwarz , N. – T rifkovic , A. – N ickel , D. – S chulz , C. – M auser , W. (2008): An integrated modelling framework for simulating regional