Industrial Hygiene Monitoring—Carlsbad Caverns National Park Elevator Rehabilitation

Design of environmental controls and air monitoring program protects the public and environment at a 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 blasting, rock removal with pneumatic equipment, and grinding of steel surfaces and lead abatement activities. The objective of the air monitoring was to prevent exposure of the public and the environment to harmful levels of dust 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 project is in compliance with project design specifications and applicable regulations.