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PT Belayan Internasional Coal is an open-pit system mining company, one of its geotechnical activities is the construction of the slopes. Slope stability analysis used the Bishop Simplified method to obtain the value of the dynamic safety factor (≥ 1,1). Currently, the value of the Safety Factor (FK) is an indicator in determining whether the slope is stable or not. The parameters used in the slope stability analysis are the physical and mechanical properties of the rock, namely weight (ɣ), cohesion value (c), and internal shear angle (∅). From the results of dynamic overall slope calculations, the recommended overall slope is constructed with an individual slope angle of 55°, a bench width of 5 meters, a height of 10 meters, and the number of individual slopes of 8 slopes. This design will produce dimensions of the overall slope with 41° slope angle, 80 meters high, and has a dynamic safety factor value of 1,102 with the water-saturated condition. Thus, the slopes are in stable condition.

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The research located in Sambutan TPA, Samarinda City, East Kalimantan Province, Indonesia, with an area of ±350 m 2 . This study aims to interpret the resistivity and direction of the distribution of subsurface leachate using the resistivity method of the Wenner configuration with a track length of 90 m per pass. The leachate is known to have a resistivity value of <10 ´ m. The results of the analysis of the measurement location and the indicated depth of leachate have different variations, on the path 1 leachate in the north -south direction has a resistivity value range of 0.467-8.76 ´ m with a depth of 0-12.4 m, path 2 leachate with the direction of Northeast -Southwest has a resistivity value range of 5.77´ m with a depth of 0-12.4 m, path 3 leachate in a South -Northwest direction has a resistivity value range of 2.55-9.34 ´ m with a depth of 0-15 m and track 4 of leachate in the Southwest -Northeast direction has a value range of 6. 49-8.78 ´ m with a depth of 0-7.82 m. The results of the interpretation of the geoelectric trajectory have the direction of the leachate distribution in the Northeast -Southwest direction in the study area.

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