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The quarry blasting is one of the artificial explosions that produces stresses in the ground and may have a great effect on the near foundations. The estimation of the stress level either in the weathering layer or the bedrock is necessary for the safety of the existing buildings near the quarries. Cement Companies has been in operation since 1956 close to Helwan City, Egypt. Since then, new buildings and new communities were established in the area such as the City of 15th of May. For the safety of these buildings, detailed and continuous monitoring of the peak particle velocity of the quarry blasting operations was carried out since January 1997 till September 2000. The maximum values of the stress level for the weathering layer has been found smaller than that for the bedrock for both of the P- and S-waves. The damage observed in the buildings close to the quarry blasting operations, indicates that these stress levels are high.

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