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This paper presents the results of ground vibration measurements and environmental issues occurred on tunnel blasting activities during KavacД±k-Beykoz waste water tunnel construction under a residential area in Istanbul, Turkey. Within the scope of the study, the blasting pattern of tunnel was engineered by using Tunnel 2000 design software. 5 events in 5 shots at S2 shaft tunnels, , 6 events in 6 shots at S4 shaft tunnels, , 32 events in 32 shots at S6-shaft tunnels and, 7 events in 7 shots at S7 shaft tunnels w...