GEOCHEMICAL STUDY OF GROUNDWATER IN KEBONTURI VILLAGE AND SURROUNDINGS, ARJAWINANGUN DISTRICT, WEST JAVA PROVINCE

• Main Author: Jonathan Matondang, Frans
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/77324
• Institution: Institut Teknologi Bandung

Institut Teknologi Bandung (ITB) inaugurated the Cirebon campus as one of the multicampus development programs in 2016. As a result, the population living around the campus and the need for clean water for daily activities has increased. Meanwhile, the knowledge about the condition and quality of the groundwater is still very limited due to the lack of research on the groundwater in the area. Therefore, research on the groundwater condition and quality in this area is needed. The research area is located in Kebonturi village, Arjawinangun district, Cirebon regency, West Java. The research area is 4.3 km2 and one kilometer away from the Cirebon campus area. This research aims to determine the subsurface conditions, groundwater flow direction, characteristics and quality of groundwater in Kebonturi Village and its surroundings. The methods used in this research include observation of dug wells, measurement of groundwater levels, and groundwater sampling (pH, TDS, electrical conductivity, salinity, color, odor, taste, and temperature). There were 36 groundwater samples and 8 resistivity cross-sections used in this study. The groundwater samples consisted of 21 samples from drilled wells, 13 samples from dug wells, and 2 samples from hot springs. In addition, ten of these samples were further analyzed in the laboratory to determine the concentrations of major ions, fluoride, and hardness. According to the resistivity cross-section, the subsurface layer is dominated by a layer/material consisting of sand mixed with clay, which is capable of storing water in limited quantities. There are three proposed locations for groundwater drilling and the flow direction is expected to move eastward according to the groundwater level distribution map. The analysis and interpretation of groundwater geochemistry is done by using Piper diagram and Kloosterman diagram. Based on Piper diagram, the groundwater facies in the research area is divided into five facies, such as bicarbonate non-dominant facies, sodium sulfate facies, sulfate non-dominant facies, sodium chloride facies and mixed facies. Based on Kloosterman diagram, the groundwater in the research area is divided into five hydrogeochemical types, such as type II (semicarbonate water), type IV (sulfate water), type Va, type VI (intrusion), and mixed zone. According to the physical and chemical parameters of the groundwater, the groundwater in the research area is considered unfit for direct drinking without prior treatment. In addition, a hot spring was discovered about 6.4 km from the research area, which is not expected to affect the groundwater system.