Analyzing and reducing the possible effects of air pollution on human health became important issues for improving the quality of life in urban areas. Particulate matters (PM) are air pollutants with a potential important impact on the health of vulnerable people (e.g., children, elderly) and non-vulnerable people as well. The level of PM air pollution is mainly influenced by the PM concentration and by parameters such as the meteorological conditions and the synergic effects of other air pollutants. Different clime scenarios have been developed to model the PM dispersion generated by the Caprisoara tailing pond, which stores the ashes from the Paroseni thermal power plant, and the effect on city Vulcan from Jiu Valley, in the Meridional Carpathian Mountains. The PM dispersion was simulated using the METI-LIS version 2.03 (Ministry of Economy, Trade and Industry-Low rise Industrial Source dispersion model)-a software developed under the funding of the Japan Ministry of Economy, Trade and Industry and the Research Center for Chemical Risk Management from Japan. The dominant direction of the winds in the Vulcan area is west, westnorth-west, therefore the contribution of the Caprisoara tailings pond to PM generation in Vulcan is limited to periods when the wind blows from south, south-southwest , with an above average intensity in the conditions of a turbulent atmosphere, which happens during the summer. A cheap solution to minimize the displacement of fine particles is to maintain permanently a layer of wet material on the top of tailing pond.
Often, excavations of natural slopes are necessary in the site area for the construction of civil or industrial objectives. The execution of such works requires special attention, from the design phase, regarding the stability of the slope in the initial state, but also after excavation and identification, if necessary, of technical solutions to increase the stability reserve, thus ensuring the security during the execution of works but also of future constructions. Such a situation was encountered in the case of Anina Wastewater Treatment Plant (WWTP), when, in the absence of proper investigations of the slope to be excavated, there was a landslide that interrupted the site activities, and which, to some extent, jeopardized the objectives already built. In this context, at the level of 2015, slope stabilization works were designed and executed, works that proved to be insufficient. In 2021, it was necessary to conduct a new stability study in order to analyze the possibilities of continuing the construction of the treatment plant. This paper presents the results obtained during this study, as well as a series of conclusions and interpretations, regarding the technical condition of the slope in different hypotheses.
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