Pondasi merupakan struktur bawah digunakan sebagai penahan beban serta meneruskan beban kedalam tanah dan batuan yang terletak di bawahnya. Penggunaan pondasi bangunan memerlukan perencanaan yang benar, agar pembebanan bangunan tidak melebihi daya dukung tanah. Perencanaan pondasi pada tangki minyak mengunakan data uji kerucut statis (sondir), untuk mengetahui kapasitas daya dukung tiang pancang dan penurunan yang terjadi. Kapasitas dukung tiang pancang dihitung berdasarkan data- data (Sondir). Dengan mencari daya dukung tiang pancang mengunakan metode Schmertmann, serta menghitung penurunan tiang tunggal dan Penurunan ijin dengan rumus Poulus-Davis. Adapun hasil perhitungan didapatkan beban yang dipikul pondasi (Pu)= 197.731,99 kN dengan kapasisitas kelompok izin (Qg)= 197.797,2522 kN. Berdasarkan data lapangan CPT (Cone Penetration Test) diperoleh (Qall)= 1.068,00 kN, dengan beban maksimum pada tiang pancang (Pumax)= 974,05 kN. Berdasarkan hasil perhitungan penurunan total tiang tunggal yang terjadi cukup aman yaitu penurunan tiang apung= 0.13953691 cm dan penurunan ujung tiang= 0.279073819 cm dengan penurunan ijin 3 cm maka penurunan total tiang tunggal memenuhi syarat – syarat yang diijinkan.

The Foundation is under the structure used as anchoring the load as well as the continued burden into the soil and rocks which lie beneath it. The use of the building's Foundation requires planning, so that the collapse of the land arising from the load of the building does not exceed the carrying capacity of land. Planning the Foundation on the oil tank using test data of static Cone (sondir), to know the power capacity of the support pillars of the stake and the downturn happened. The capacity of a support pillar of the stake is calculated based on data-data (Sondir). By finding the power support using the Schmertmann method powerboats, as well as counting the decrease in single pole and a decrease in permits with the formula Poulus-Davis. As for the calculation result obtained burden shouldered Foundation (Pu) = 197.731,99 kN with a capacity of groups permission (Qg) = 197.797,2522 kN. Based on the data field CPT (Cone Penetration Test) obtained (Qall) = 1.068,00 kN, maximum load on a pole with a stake (Pumax) = 369,24 kN. Based on the results of the calculation of the total decline in single pole that happened fairly secure i.e. decrease in buoyancy pole = 0.13953691 cm and decline in the tip of the single pole = 0.279073819 cm with a decrease in permission = 3 cm then a decrease in the total eligible single pole – the terms are permitted.