Industrial Hygiene


Our industrial hygiene (IH) services keep your workplace safe and your company OSHA compliant. We provide health and safety audits, worker exposure monitoring, and a variety of training as well as asbestos, lead paint, and mold testing and remediation services.

IH is a field encompassing the health and safety of workers and building occupants. Knowledge of the lead content in paint and other materials is needed for compliance with the Occupational Safety and Health Administration (OSHA) and the U.S. Department of Environmental Protection.

TD&H Engineering’s IH personnel perform investigations, project design and oversight, and clearance testing for microbial remediation, including bacteria and fungi, both viable and total concentrations.  TD&H Engineering’s relationship with certified industrial hygienists enables us to provide local, cost-effective IH consulting services for complex projects with the benefit of guidance and review by the most qualified specialists in the field.

TD&H Engineering provides services for a variety of private and government entities for restoration, renovation and demolition projects.

Asbestos is the fibrous mineral matter added to thousands of building products because of its strength and resistance to fire, chemical attack, and decay.  Most asbestos-containing materials were banned in 1978 due to the high incidence of lung damage (asbestosis) and lung cancer occurring from exposure to airborne fibers.  Prior to renovation or demolition of a structure, an asbestos inspection must be performed and the proper notification filed per the National Emissions Standards for Hazardous Air Pollutants (NESHAP – 40 CFR 61).  In addition, the U.S. Occupational Safety and Health Administration (OSHA) regulates work in proximity to asbestos-containing materials, and most states have asbestos programs to administer NESHAP and state regulations.  TD&H Engineering helps clients manage asbestos risks by performing asbestos inspections and assisting with asbestos abatement project design and monitoring, including clearance monitoring using phase contrast microscopy (PCM).

Lead is a very useful heavy metal that has been known and used for millennia.  It is also a central nervous system poison.  Lead (typically present as lead-based paint) is governed by federal regulations.  Regulations administered by the U.S. Environmental Protection Agency (EPA) include NESHAP and the Resource Conservation and Recovery Act (RCRA).  OSHA requires monitoring of respirable lead and the use of work methods and engineering controls to prevent exposure of workers above the Permissible Exposure Limit (PEL).  Prior to disposal of demolition waste, RCRA requires that the waste stream be characterized.  TD&H Engineering’s IH personnel perform surveys for lead-based paint and assist clients with the characterization of proposed waste streams for lead and other heavy metals, as well as arranging for proper abatement and disposal as appropriate.

Mold is a fungus that is present everywhere in our environment, both indoors and outdoors. There are tens of thousands of mold species that have the potential to cause health problems. Molds produce allergens and in some cases, potentially toxic substances (mycotoxins) that may cause allergic reactions in sensitive individuals. It is impossible to eliminate all mold and mold spores inside a structure but mold can be controlled by reducing the moisture and humidity indoors.

TD&H Engineering’s personnel are trained in mold inspection, bulk and surface sampling, and air monitoring to determine the type and quantity of mold in commercial and residential structures. Mold inspections include an interpretation of sampling results and recommendations on abatement.

Indoor air quality (IAQ) can have significant impacts on the health and productivity of workers or residents.  Parameters of concern include biological, chemical, and physical factors.  Biological factors include bacteria and fungi (including molds), both pathogenic microorganisms and allergens.  Chemical parameters are not only present in industrial settings, but also in commercial and residential settings, and can be associated with building materials and common chemical products.  Physical parameters include temperature and relative humidity, the rate of air exchange, and other factors typically associated with heating, ventilating, and air conditioning (HVAC) systems.  TD&H Engineering has experience conducting IAQ investigations in industrial, commercial, and residential settings.

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Services Include:

  • Abatement Design, Oversight, and Air Monitoring
  • Asbestos, Lead Paint, and Mold Testing and Remediation Services
  • Confined Space Assessments
  • Design of Complex Radon Mitigation Systems
  • Final Visual and Air Monitoring/Clearances
  • Inspection and Sampling
  • Occupational and Ambient Noise Monitoring
  • Personal Exposure Monitoring for OSHA Compliance
  • Site Health and Safety on Petroleum-Related and Hazardous Waste Sites



Recent Industrial Hygiene Projects

  • Orthopedic Center

  • Agri-Processing Facilities

  • Petrochemical Facility

  • Grain Load Facilities

  • 4th St. Parking Project

  • Potlatch No. 1 FCU Building

  • Water Main Extension/Upgrade

  • Birch Point & City Beach Sewer Lift Stations

  • Jette Meadows Water & Sewer District

  • Super 1 Foods Store

  • MSU- South Fieldhouse Parking Lot Improvements

  • MSU- Harrison Street Reconstruction

  • Yellowstone National Park Dormitories

  • Central Energy Plant

  • 10th Street Water Main