The following data refer to a multi-cylinder 1,500 hp Diesel engine alternator unit having direct connected exciter: 9,500 kg weight of alternator and exciter, 98,500 kg weight of engine and flywheel, 12 m x 4 m dimensions of bedplate.The subsoil is average sand. Clearance is limited to 20 % of engine dimensions and/or the height of foundation must not exceed 4 m.Design and detail a foundation for this engine for a) rectangular foundation b)trapezoidal foundation and c) frustum foundation.