What does Level 1 internal containment involve according to NJAC 5:17?

Level 1 internal containment according to NJAC 5:17 involves implementing a specific method of sealing the area to prevent the spread of lead dust or debris during abatement activities. This method requires the use of one layer of polyethylene sheeting every 5 feet to create a barrier that minimizes exposure to lead hazards. The focus of this level is on controlling lead dust and limiting its migration in the environment, making it crucial for maintaining safety during the work process.

The other options describe different conditions or levels of containment that do not align with the definition of Level 1. For instance, having two layers of poly with flaps for doorways indicates a more stringent type of containment, indicative of higher levels of lead hazard management. Levels that restrict resident occupancy or have no restrictions fail to accurately represent the requirements set forth for Level 1 containment, which specifically outlines the basic yet effective measures for managing lead hazards. Thus, option A stands out as the correct definition for Level 1 internal containment.