## 3 Results and Discussion
### Bioremediation of Polluted Soil
In the case of these quantities of bioremediated soil, the target was reached after two bioremediation steps and thus a long period of more than seven months (Figure 4, Supplementary Files Table S4). For the soil brought from the bioremediation platform in the area of well 921 Suplac, two bioremediation reruns were also necessary, using 25 straw bales, 300 kg of NPK and five aeration stages. After seven and a half months, it was biore mediated, the TPH concentration value reaching 1821 units compared to 8608 (Supplementary Files Table S5), the value from which bioremediation was started (Figure 5). Repeated stockpiling also required soil brought from the 514 Bors well area, which, after two bioremediation stages (Figure 5) and the use of high quantities of straw bales (60 pieces) and 500 kg NPK, to which was added 1000 kg manure and five aeration stages, after 8.5 months achieved its bioremediation target (Supplementary Files Table S6). For the soil brought from the bioremediation platform in the area of the borehole 515 Bors, two bioremediation reruns were also necessary (Figure 6) in which using 30 straw bales, 300 kg of NPK and five aeration stages, after seven and a half months it was biore mediated, the TPH concentration value reaching 1588 units compared to 8974 (Supplementary Files Table S7) value from which bioremediation was started. For the soil brought from the bioremediation platform in the area of the borehole 515 Bors, two bioremediation reruns were also necessary, using 30 straw bales, 300 kg of NPK and five aeration stages. After seven and a half months, it was biore mediated, the TPH concentration value reaching 1588 units compared to 8974 (Figure 6), the value from which bioremediation was started (Supplementary Files Table S8). Also, 30 straw bales, 400 kg NPK and four rounds of aeration were needed for the soil brought from the  
Figure 4: The evolution of the TPH concentration during the bioremediation of the soil from the area of well 561 Mihai Bravu (**left**) and of the soil from the area of well 682 Suplac (**right**). Figure 5: The evolution of the TPH concentration during the bioremediation of the soil from the area of well 921 Suplac (**left**) and for the soil from the area of well 514 Bors (**right**). 805 Scarisoara well area to reach its bioremediation targets, reaching a TPH concentration of 1398 from an initial value of 8798 after four months (Figure 6). The time required for bioremediation of oil-polluted soils within the study area varies between 17 and 36 weeks (i.e., 119 and 252 days), a higher rate than in other case studies in similar articles, 45 days in the case of bioremediation using vermicompost [43], 49 days in the case of bioremediation with _Ricinus communis_ L. enzymes [44], 187 days in the case of remediation by persulphate oxidation coupled with microbial degradation [45] but the differences are due to the technology applied and the degree of initial soil pollution. Because hydrocarbons stay in the soil for a very long time, biostimulation and bioaugmentation techniques must be used to dispose of them [46; 47; 48]. The National Agency for Environmental Protection is trying to implement a National Strategy and a National Action Plan for the Management of Contaminated Sites in Romania, which aims to reduce the environmental impact of soil contamination resulting from the exploitation of petroleum products, their transport and storage. Romania inherited a large number of historically contaminated sites from the Industrial Revolution. The history of contamination of these sites and their ownership aspects differ from one situation to another, making it difficult to generalise or regionalize them, as anthropogenic activities have significantly contributed to pollution, accelerating the predominant negative effects. The strategy and action plan consist of promoting legal rules that would make it possible to establish the percentage of responsibility of each landowner with a contaminated site in proportion to the share of contribution to the contamination of the site.