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PROJECT 1: Oil and Gas Field Hydrogen Sulfide Gas Emissions Monitoring and Abatement

Rapid identification of worker exposure levels and the development of abatement strategy to support successful lease agreements with federal agencies.

Landmark provided air monitoring and abatement services to a major oil and gas production company for hydrogen sulfide emissions emanating from pressure integrity events at an oil field site located in Wyoming. These emissions posed a significant potential worker exposure health threat.

Air monitoring was performed to assess for carbon dioxide, hydrogen sulfide, oxygen, and Lower Explosive Limit.  The work was conducted while wearing supplied-air respirators until sufficient ambient air and personal exposure monitoring data indicated that other respiratory protective equipment would be appropriate.

Once emission levels were determined, Landmark worked with the client to evaluate emission rates over time to support master leasing plans and lease parcel reviews for public land mineral lease agreements. Based on the findings of air monitoring, and the confirmed effectiveness of the installed emission control systems, Landmark provided programmatic Environmental, Health, and Safety advice for future operations at the oil fields.

PROJECT 2: Industrial Hygiene Services for a Regional Power Generation and Transmission Cooperative
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Landmark works in concert with local operations and corporate Environmental, Health, and Safety personnel to develop feasible and cost-effective solutions to help mitigate risks and minimize downtime. 

Landmark has provided a regional power generation and transmission cooperative with a variety of industrial hygiene services over the past 20 years.  These projects vary in scope from Indoor Air Quality Investigations to enhancing a company-wide hearing conservation program. Representative projects include:

  • Landmark conducted extensive air monitoring services during power station outages for asbestos, lead, and welding fumes, including hexavalent chromium. All sampling events were designed to minimize disruption to operations during time-critical outages while confirming proper procedures for occupational health and safety were maintained.

  • Landmark conducted comprehensive noise surveys in six power generation facilities that identified and clearly delineated areas of potential noise hazards. The pre-existing Hearing Conservation Program was enhanced by the collected data, and the results were technically evaluated and coordinated in a manner that promoted feasible implementation through the identification of practical noise hazard mitigation alternatives.

  • Landmark conducted an Indoor Air Quality Assessment of two buildings in response to employee complaints. After conducting interviews and a thorough review of related data and documents, Landmark developed a strategic sampling and analysis plan to support the evaluation of options for response and building system upgrades. Project communications addressed sensitive Human Resource concerns in a professional and timely manner that supported improved employee relations.

PROJECT 3: Industrial Hygiene Monitoring to Support Elevator Rehabilitation at Carlsbad Caverns National Park
IH - Sampling from Completed Sub Slab Va

The design of environmental controls and air monitoring programs protected the public and environment at this UNESCO World Heritage Site.

Carlsbad Caverns National Park provides visitors access to some of the largest limestone caves in North America. To access the caves, elevators were constructed in 1932 and 1954 to transport guests and cargo to the caves approximately 750-feet below. Water seepage, humidity, and time contributed to the corrosion of the structural steel components in the elevator shaft.


This project included complete replacement of structural steel components during a structural demolition and rehabilitation project within the elevator shaft.

The project included air monitoring during media abrasive blasting, rock removal with pneumatic equipment, grinding of steel surfaces and lead abatement activities, and application of industrial coatings. The objective of the air monitoring was to prevent exposure of the public and the environment to harmful levels of dust, volatile organics, and lead particulate, as well as evaluation and protection of natural resource conservation concerns such as noise and temperature/relative humidity levels in the caves. Monitoring was conducted in the occupied portions of the Visitor Center and sensitive cave areas adjacent to the elevator shaft to protect the public, staff, and certain threatened/endangered species within the cave.


Landmark’s industrial hygienists also conducted Quality Assurance Inspections and oversight to ensure that the project complied with project design specifications and applicable regulations. Ongoing projects include radon exposure assessments and ventilation/engineering evaluations for worker and visitor safety.

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