Occupational and Environmental Health Site Assessment (OEHSA)

The OEHSA is a comprehensive, all-hazards assessment used to identify occupational and environmental health threats. The purpose of the OEHSA is to identify and evaluate potential environmental exposures that may impact the health of installation personnel. 

The OEHSA documents environmental conditions that exist at the time of the assessment, identifies potential occupational and environmental health threats, guides further occupational and environmental health data collection activities, health risk assessments, and summarizes immediate or long-term risk mitigation actions necessary at installations. 

The cornerstone of the OEHSA process is the Conceptual Site Model (CSM). The CSM describes all complete and potentially complete exposure pathways and is used to develop a sampling and analysis (SAP) plan to fully characterize the risks associated with complete exposure pathways.  The SAP defines why, when, where, how, how many, how often, and how long environmental sampling must be done to fully characterize health risks. The SAP ensures that the ongoing collection of environmental data will be representative of exposures to the populations at risk and provide actionable information for risk management.

The OEHSA is the key force health protection document that drives further environmental data collection and health risk assessments. EPD possesses the unique skill set necessary to effectively train and provide authoritative consultation on all phases of the OEHSA process.  This high level of training provided by EPD prepares preventive medicine personnel to produce scientifically valid and defensible OEHSA

  • Phase I

    A preliminary assessment involves reviewing historical records, conducting site visits, and interviewing knowledgeable parties to identify potential environmental concerns. 

    Two male construction workers wearing white hard hats and reflective safety vests looking at a clipboard on a construction site with steel beams in the background.

  • Phase II

    If potential concerns are identified in Phase I, Phase II involves sampling and testing of soil, water, or other media to confirm the presence and extent of contamination. 

    Aerial view of an industrial warehouse storage area with construction materials, metal frames, and a white vehicle among various equipment and supplies.

  • Phase III

    If contamination is confirmed, Phase III focuses on remediation and cleanup of the affected areas.  If confirmed in surrounding areas, notification and documentation of population at risk.

    Three professionals working on architectural plans at a conference table with blueprints, a laptop, a calculator, a smartphone, and a blue safety helmet.

  • Phase IV

    An OEHSA report will include: Exposure data; Photos and maps of concern areas; Recommendations and prioritized improvement plan; and an Optional sampling plan or monitoring schedule.

    Desk with colorful sticky notes, pens, and a planner or report titled 'Experience Briefing', along with a mug, a phone, and a clear plastic box filled with sticky notes and markers.
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Toxic Industrial Chemicals and Toxic Industrial Materials (TIC/TIM)

SEILAS Solutions provides specialized safety consulting and hazard assessment services focused on Toxic Industrial Chemical (TIC) and Toxic Industrial Material (TIM) exposure risks at military installations across the U.S.

Our TIC/TIM service supports commanders, facility managers, and emergency planners in identifying, controlling, and preparing for potential chemical threats—whether from operational processes, storage, transportation, or external sources.