Los Angeles was constructing an underground 12 ft in diameter sewage tunnel stretching 25 km. The project includes nine construction access shafts where tunnel boring machines, muck trains, and materials were lowered into the ground. The excavated tunnel material was transported from the tunnel head to the access shafts by muck train, removed by a crane, and carried away via heavy haul trucks. A state of art remote construction noise system was developed and installed near each of the shaft sites, which was collecting noise, audio, and video data 24 h a day. Noise levels were recorded whenever a noise limit threshold is exceeded. Data were then transmitted via modem to a central location where noise specialists review and analyze the data. A portion of these noise limit exceedances were correlated to the audio and video files to determine if the exceedances were due to the construction activities or other non-construction related events. Construction noise at the noise sensitive sites adjacent to each shaft were minimized by constructing sound walls as high as 10 m.