For 25 years, HMMH has been providing noise and vibration consulting services to DART on all phases of their light rail transit system projects. Initially, HMMH was the noise and vibration consultant on the Principal Section Design Team for the Light Rail Starter System in Dallas, including the West Oak Cliff, South Oak Cliff, Central Business District, and North Central Lines. HMMH services at that time included noise and vibration analysis for the Final Environmental Impact Statement, noise and vibration control design recommendations for rail operations and facilities, station architectural acoustics, and construction noise and vibration issues.
HMMH subsequently provided noise and vibration consulting services during both the environmental assessment and final design phases of the Light Rail Transit (LRT) extensions along the Northeast Corridor to Garland and along the North Central Corridor to Plano. HMMH services on these projects included baseline community noise monitoring, ground-borne vibration propagation testing, noise and vibration tests of the DART LRT vehicle, noise and vibration predictions and assessment, design of mitigation measures and public meeting participation. Following that, HMMH assisted in the environmental planning work and provided noise and vibration consulting services as part of the engineering design for two additional DART LRT extensions, including the Southeast Corridor Line to Pleasant Grove and the Northwest Corridor Line to Carrollton.