The Virginia Department of Transportation (VDOT) and the FHWA are conducting a study of the Interstate 64 Hampton Roads Bridge-Tunnel corridor from Interstate 664 in Hampton to Interstate 564 in Norfolk (approximately 11 miles), to address capacity and roadway deficiencies in the corridor. Study Alternatives were evaluated using several criteria, including potential environmental impacts. HMMH supported the Draft Environmental Impact Statement (EIS) with noise and air quality analyses under an aggressive schedule, producing technical reports in time for review and comment. HMMH conducted further study on this corridor in 2016 as part of the more comprehensive Hampton Roads Crossing Study.
HMMH conducted detailed noise impact assessments for four alternatives at over 1700 receptors each, and performed preliminary noise abatement designs for up to approximately 15 miles of replacement and potential new barriers for each of two Build alternatives. The barriers evaluated would benefit up to 1,000 impacted noise-sensitive residences and recreational receptors (1,900 receptors in total) at an estimated cost of $40 to $50 million if all barriers were approved and constructed.
Because this project was identified as one with High Potential Mobile Source Air Toxics (MSAT) impacts due to projected traffic volumes, HMMH conducted a quantitative MSAT analysis estimating net emission increases or decreases compared to the No-Build conditions within the study. The analysis was conducted for eight air toxics for both the interim build year of 2020 and the 2040 design year. The quantitative MSAT analysis demonstrated that there would be no long-term adverse impacts associated with the Study Alternatives. In addition, an air quality assessment was conducted for the proposed tunnel to estimate in-tunnel concentrations of carbon monoxide for peak hour and incident (idle) conditions.