## 4 Conclusions  
From the category of parameters that directly and indirectly influence the biodegradation of hydrocarbons, several categories of parameters stand out, such as the composition and nature of the pollutants (depending on the source of the oil), the presence of microorganisms in the soil (in their case there is a direct link between the possibility of biodegradation and their prior exposure to hydrocarbons), the accessibility of contaminants (dependent on their concentration and influenced by the presence and influence of oxygen and nutrients), the physical state of the hydrocarbons (directly influencing bioaccessibility, with high concentrations being influenced by solubility), temperature (influencing the time required for biodegradation, influenced by both the ambient temperature and the mixture of hydrocarbons and micro-organisms in the bioremediation soil), nutrients (iron, phosphorus and carbon being necessary for the growth of soil microbes) and oxygen (which can act as an inhibitor of biodegradation in the initial stages). The significance of this research lies in its capacity to pinpoint historically petroleum-contaminated sites, elucidate remediation strategies for representative case studies, and integrate these lands into the agricultural framework based on their suitability classification. A compelling advantage of GIS spatial analysis lies in interpolating pollutant values predicting levels at untested locations. This predictive capability proves crucial for assessing soil transportation needs to bioremediation centers and determining the extent of soil replacement, ensuring a return to original agricultural use post-remediation. Figure 6: The evolution of the TPH concentration during the bioremediation of the soil from the area of well 515 Bors (**left**) and for the area of well 805 Scáríísoara Nouá (**right**). The advantage of using an analysis involving GIS spatial analysis lies in the possibility of interpolating point values of pollutants to predict expected values at points where drilling has not been carried out. This is important because it makes it possible to estimate the amount of soil that needs to be transported to the bioremediation stations and the amount of soil that needs to be replaced so that the land in question can be returned to the original agricultural circuit and so that the original crops and main use can be applicable after the bioremediation stage. The period required for bioremediation of hydrocarbon-polluted soils for the samples analysed in this article also ranged from 17 to 36 weeks. This time period depends on the degree of pollution and the bioremediation measures applied. To achieve this goal, another important step in the analysis was to collect information from the landowners for which the soil has gone through the bioremediation stages, important for the present analysis being the analysis of the production obtained by them after the bioremediation stage, compared to the production obtained previously. When polluted soil needs to be bioremediated, the question of cost-effectiveness always arises. Costs for bioremediation rise dramatically. Straw bales, NP, and manure alone are anticipated to cost roughly 12,869 euros, not including transportation to the bioremediation platform, aeration work, mixing, etc. Proposals have been made regarding examples of good practice in the management of wells in operation and those that have been greened, and recommendations for the establishment of agricultural crops and initial main uses, considering the physicochemical characteristics of the soils. This is of interest because there is no clear situation at the regional level regarding sites contaminated or potentially contaminated with petroleum products as a result of industrial extraction and transport or storage activities.