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The Polish-Egyptian Archaeological and Preservation Mission at El Ashmunein, set up by the State Ateliers for the Conservation of Cultural Property and the Egyptian Antiquities Organization has undertaken the task of working out a programme for the preservation of ruins of ancient Hermapolis Magna. The first stage comprised ruins of Early Christian basilica, where some conservation work had been done in the forties. The basilica is the first architectural monument in Ashmunein for which a complex programme of studies will be drawn, aimed at determining causes and degree of the corrosion of stone building material. This will allow to decide upon a technique of future conservation procedure. The basic conservation problem is to protect stone buildings against salt penetration. Due to a high level of ground water and recently changed water and climatic conditions fine examples of architecture are exposed to corrosion, the scope of which is hardly to be foreseen. Therefore, apart from the studies on the corrosion of the stone an important problem is also to carry out hydrogeological studies of the entire post and afterwards to determine a degree of endangerings to which other monuments are exposed. An important subject is also to make observations of the progress of erosion in preserved structures from dried brick as well as to prepare documentation on the present condition of their preservation.
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