Abstract:The results of works on reconstruction and development of the hydrogeological monitoring system at the Prydniprovsky Chemical Plant site, Kamyanske (PChP) and on the groundwater survey using the improved observation wells network are presented (first such survey since 2016). During the works, geology structure of the site was précised, hydraulic testing was carried out, and groundwater was sampled at a number of uranium production legacy objects that have not been previously covered by observations. Automated … Show more
“…The data on levels of groundwater and surface water contamination in the zone of influence of the PChP site used in the risk assessments are presented in Table 1 and are based on monitoring studies conducted in 2020 -2021 [7]. Groundwater monitoring data listed in Table 1 correspond to wells with the highest contamination levels of radionuclides and toxic chemicals.…”
Section: Groundwater and Surface Water Monitoring Datamentioning
Radioactive and chemical contamination of groundwater and surface water (Konoplyanka and Dnipro Rivers) in the zone of influence of the soviet era uranium production legacy site - Prydniprovsky Chemical Plant (PChP, Kamianske) is a source of radiological and toxicological risks for the population. Modeled water use scenarios included drinking water consumption, crop irrigation, fishing, and usage of the river beaches for recreation. According to the assessment results, the radiological risks of water usage in current conditions are low. At the same time, a conservative assessment indicates potential future toxicological risks from uranium (use of groundwater for drinking) and from manganese (due to accumulation in river fish). In the long term, risks from groundwater may increase significantly due to the dispersion of contaminated groundwater plumes outside the industrial site, or due to unrestricted access of the population to the territory of the PChP. To reduce uncertainty in the risk assessment results, it is important to improve the groundwater monitoring network downstream from the PChP site and to collect site-specific data on manganese transfer coefficients to fish.
“…The data on levels of groundwater and surface water contamination in the zone of influence of the PChP site used in the risk assessments are presented in Table 1 and are based on monitoring studies conducted in 2020 -2021 [7]. Groundwater monitoring data listed in Table 1 correspond to wells with the highest contamination levels of radionuclides and toxic chemicals.…”
Section: Groundwater and Surface Water Monitoring Datamentioning
Radioactive and chemical contamination of groundwater and surface water (Konoplyanka and Dnipro Rivers) in the zone of influence of the soviet era uranium production legacy site - Prydniprovsky Chemical Plant (PChP, Kamianske) is a source of radiological and toxicological risks for the population. Modeled water use scenarios included drinking water consumption, crop irrigation, fishing, and usage of the river beaches for recreation. According to the assessment results, the radiological risks of water usage in current conditions are low. At the same time, a conservative assessment indicates potential future toxicological risks from uranium (use of groundwater for drinking) and from manganese (due to accumulation in river fish). In the long term, risks from groundwater may increase significantly due to the dispersion of contaminated groundwater plumes outside the industrial site, or due to unrestricted access of the population to the territory of the PChP. To reduce uncertainty in the risk assessment results, it is important to improve the groundwater monitoring network downstream from the PChP site and to collect site-specific data on manganese transfer coefficients to fish.
“…[3,4]. Раніше аналіз вмісту радіонуклідів уранового ряду, а також характеристик вмісту хімічними елементами підземних вод на майданчику колишнього ВО «ПХЗ» виконано у роботах [5,6,7,8].…”
Section: рис 1 картосхема проммайданчика колишнього во «пхз» (м кам'я...unclassified
“…Складовою мінерального складу фосфогіпсу якого є сульфат кальцію, який протягом десятиліть під впливом водної і вітрової ерозії поширювався на прилеглі території і також у вигляді продуктів вилуговування у підземні води місця розташування хвостосховища. Про це свідчить і підвищений, порівняно із іншими пунктами спостережень, вміст сульфатів і кальцію у підземних водах в усіх свердловинах зони спостережень навколо хвостосховища «Дніпровське» [7]. Тому результати спостережень за хімічним складом вод свердловин 110 і 36D не враховували на етапі оцінки фонових показників забруднення території промислової зони, зокрема для техногенно-підвищених концентрацій вмісту сульфатів і кальцію.…”
Section: рис 1 картосхема проммайданчика колишнього во «пхз» (м кам'я...unclassified
“…Враховуючи недоліки мережі спостережень і недостатню кількість даних спостережень, можна припустити, що за більше ніж 70 років існування хвостосховища «Центральний Яр», ореол вод із відносно високим вмістом урану (10 Бк/дм 3 і вище) перемістився із зони хвостосховища на відстань до 300 м. Вміст урану у водах алювіального водоносного горизонту зменшувався протягом періоду з 2005 по 2014 р. по лінії току від тіла хвостосховища з показниками 30-20 Бк/дм 3 до рівнів, які є близькими до умовно фонового забруднення вод промислового майданчика 0,3-0,5 Бк/дм 3 на відстані більше 500 м від хвостосховища. Дещо підвищені рівні вмісту ізотопів урану у водах алювіального горизонту у різні роки спостережень до 2-5 Бк/дм 3 є результатом впливу інших можливих джерел [7] надходження урану і сульфатів у межах нижньої надзаплавної тераси р. Коноплянка (такі ж ефекти виявлено і для зони впливу хвостосховища «Західне» і описано вище).…”
Section: таблиця 3 оцінка формул хімічного складу вод а також індексі...unclassified
This study provides an analysis of data from long-term (2005-2021) observations of the chemical composition of groundwater in the impact zone of the former uranium ore processing enterprise (Production Union Prydniprovskyi Chemical Plant (PU “PChP”) in the city of Kamianske, in particular, areas of near-surface tailings of uranium ore processed residues (“Zapadnoe”, “Central Yar” and others). All tailings on the site of the former PU “PChP” were built without installation of anti-permeable barriers, and therefore under the influence of atmospheric precipitation, the water, formed in the tailings body, highly contaminated of uranium series radionuclides and residues of chemical reagents, can penetrate to the groundwater aquifers, with which they spread beyond the limits of their technological localization in tailings. In addition, the entire territory of the former industrial site of mining and chemical production “PChP” is a complex of former enterprises, septic tanks, production waste holding sites, warehouses of chemical reagents and residues of former production, which are also sources of man-made pollution of the territory and influence on chronic pollution of groundwater. Therefore, environmental monitoring programs in the impact zone of tailings impoundments included not only monitoring of indicators of the content of uranium series radionuclides in elements of the natural environment, but also studying of the chemical composition of waters. The analysis of observation data during the period from 2005 to 2021 was carried out in order to assess the extent of the spread of polluted waters beyond the limits of the location of the tailings ponds, to identify major macroions in the composition of groundwater as indicators for assessing the spread of the contamination plume beyond the boundaries of the tailings ponds, as well as to identify patterns of formation the groundwater quality within the site under the influence of man-made and natural factors. It is shown that the mineralization of groundwater, as well as its chemical composition, significantly changed as the sampling site moved away from the tailings. Changes in the chemical composition of water and the dominant content of the major macroions at different distances from the tailing’s ponds made it possible to determine the difference in the characteristics of the influence of infiltration waters from the source of the tailing’s ponds and scattered sources of pollution within the boundaries of the PChP site along the groundwater flow line. The main factors of uncertainty in the estimations of the formation of groundwater chemistry in the zone of the industrial complex are shown, which must be taken into account for the development of the network of monitoring observations.
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