Mobile and Transportation Sources  
Zephyr prepares air and noise impact analyses for highway projects and other mobile emissions sources. Zephyr has provided predictive environmental assessments and impact statements for highway projects, international bridge crossings and inspection stations, parking lots and vehicle terminals, and off-road construction equipment. Zephyr is also pre-certified by the Texas Department of Transportation (TxDOT) and follows official Federal Highway Administration (FHWA) guidelines and preferred modeling methodologies to perform localized air and noise analyses for state roadway projects. Zephyr provides the following specific types of services related to mobile sources:

  • Review of local climate and meteorology in the project area for baseline air assessments
  • Identification of sensitive receptors potentially affected by roadway emissions and noise
  • Development of ambient air quality monitoring programs to address vehicular emission
  • Modeling of carbon monoxide and other air pollutant impacts from roadway projects using CALINE3, CALINE4 and CAL3QHC
  • Calculation of mobile emission factors and inventories using the MOBILE5 and MOBILE6 models
  • Risk assessments related to mobile source air toxics
  • Evaluation of Clean Fuel Fleet requirements for private fleets in Texas and throughout the U.S.

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Noise Assessments   
Zephyr prepares noise impact analyses for highway projects, residential developments, and industrial activities. Zephyr is pre-certified by the Texas Department of Transportation (TxDOT) and follows official Federal Highway Administration (FHWA) guidelines and preferred modeling methodologies to perform noise analyses for state roadway projects. For residential and industrial projects, Zephyr uses field monitoring and standard noise attenuation techniques to calculate potential impacts at sensitive receivers. These assessments follow guidance established by the EPA and Department of Housing and Urban Development (HUD). Zephyr also has specific experience estimating noise levels from power plants and mining activities. Zephyr's noise analysis services include the following:

  • Review of local project area and identification of sensitive receivers ? Measurement of equivalent noise levels in the field
  • Predictive calculation of noise levels
  • Impact analyses of noise emissions
  • Review of noise mitigation techniques and conceptual design of potential noise barriers
  • HUD residential noise assessments
  • Modeling of noise impacts from roadway projects using the FHWA Traffic Noise Model (TNM) or the STAMINA/OPTIMA model
  • Monitoring of ambient noise levels due to traffic and other contributing sources
  • Modeling of noise impacts from roadway projects using the FHWA Traffic Noise Model (TNM) and the STAMINA/OPTIMA model
  • Reviews of noise mitigation techniques and conceptual design of potential noise barriers