Thesis Type: Postgraduate

Institution Of The Thesis: Marmara University, Institute For Graduate Studies İn Pure And Applied Sciences, Department Of Environmental Sciences, Turkey

Approval Date: 2022

Thesis Language: Turkish


Supervisor: Orhan Gökyay


Fuel stations pose a potential risk for soil and groundwater due to the substances they store in underground tanks from the moment they start operating. In addition, due to industrialization and population growth, the number of these fuel stations, where retail trade of automotive fuel is carried out, increases every year. In order to protect soil and groundwater, rapid detection and diagnosis of leaks from fuel stations is important.

The purpose of this study is to visualize and eloborate in terms of the Regulation on Control of Soil Pollution and Point Source Contaminated Fields (RCSPPSCF) in a fuel station contaminated with oil spills, and to determine the source of pollution and rehabilitation/remediation methods.

Within the scope of the study, soil samples were taken by making 4 shallow drillings at a depth of 4-6 meters for soil sampling at the fuel station contaminated with oil spills.

In order to expand the study and determine the source of pollution in the study area, 10-12 m deep drillings and observation wells were created at three selected points, including underground tanks containing gasoline and diesel oil, fuel infrastructure filling islands and infrastructure installations to represent the study area.

In order to determine the water quality, a total of 10 sets of water samples were taken from three wells in the field. The first nine datasets were collected with a low-flow pump between March 2018 and October 2019 (on average once in 2-3 months) and sent to the international laboratory for total petroleum hydrocarbons, benzene, toluene, ethyl benzene and xylenes (BTEX) and methyl tertiary butyl ether (MTBE) analysis. The tenth data set was taken in October 2021 and its analyze was completed with the same method, In addition, indoor air passive sampling was carried out in December 2018 from two selected points in the closed parking area of the neighboring building of the study area and from the elevator in the basement floor.

In terms of environment and public health, a pilot scale surface improvement system was established at the fuel station. The fuel and petroleum-derived product accumulating in the formed wells was safely taken to the temporary waste storage unit of the facility by means of submersible pumps and compressors, and disposed of in accordance with the legislation.

The distribution of pollution was monitored with the GWSDAT program using the sample results taken from the study area. Moreover, with the RISC5 program, the risk of cancer of the employees at the station and the people around them was revealed.

In the light of all the data obtained, the study area was evaluated within the scope of RCSPPSCF. As a result of these evaluations, it has been determined that the site is contaminated in terms of soil and groundwater.