Abstract:
Muara Fajar Landfill is one of the landfill sites in Pekanbaru City. This landfill is equipped
with a leachate pond. In this area it is suspected that there is leachate seepage which is a
waste pollutant that can contaminate the soil in the area around the landfill. Therefore,
research is needed to determine the distribution pattern of leachate and analyze the
structure of the subsurface layer at a landfill in order to obtain lithological feasibility in a
landfill. One of the geophysical methods that is often used for lithological studies is the
geoelectric method. The configuration of the geoelectric method used in this study is the
geoelectrical method of the Wenner configuration. The wenner configuration aims to
describe the vertical and horizontal variations of rock which will produce a cross section of
resistivity in 2 dimensions. The measurement results obtained from the research location
were in the form of resistivity data which was processed using the Res2Dinv software and
interpreted into rock lithology. In the research area, measurements were made of 2 tracks
with a track length of 100 meters. The depth reached using the Wenner configuration is
7.46 meters below ground level. On track 1 which is located at a depth of 2.25 meters has a
resistivity value of <10 Ωm which is estimated as a leachate contaminated zone having a
resistivity value of 7.09 Ωm. While on track 2 there is no layer estimated as leachate. The
leachate- contaminated area found on track 1 comes from landfill leachate which is in the
north to the southeast of track 1. The leachate is only found in one point of the area and no
leachate distribution is found in other areas on the track. Therefore, the distribution pattern
cannot be determined. Identification of rocks found around the Muara Fajar Pekanbaru
Landfill include clay, gravel, and sandstone. This is agree with the lithological feasibility
of a landfill.
