Attachment_B6_Hendley_ES_Radon_Report.pdf

This is a laboratory analysis report for radon testing conducted at Hendley Elementary School in Washington, DC by Air Chek, Inc., dated February 20, 2023. The District of Columbia Department of General Services issued a Request for Proposals for design-build services to modernize Hendley ES, located at 425 Chesapeake Street SE. The modernization project includes design and construction services for approximately 79,575 square feet of combined renovation and new construction to meet District of Columbia Public Schools Educational Specifications. The scope encompasses outdoor play and educational areas, a minimum U-8 size turf field, parking and loading facilities, new site fencing, and replacement of existing exterior site amenities in kind unless otherwise modified during the project. Exterior site improvements will be subject to change based on community engagement.

The radon testing was conducted from February 13-16, 2023, across 15 locations within Hendley ES, including classrooms, offices, cafeteria, health suite, kitchen office, and one blank control sample. Results ranged from less than 0.3 picocuries per liter (pCi/L) to 1.0 pCi/L, with most readings below 0.3 pCi/L. The cafeteria locations registered the highest readings at 0.9-1.0 pCi/L, while the G 14 Classroom measured 0.9 pCi/L. All radon measurements remained below the EPA action level of 4.0 pCi/L, indicating acceptable indoor air quality at the facility. This radon assessment appears to be a preliminary environmental baseline evaluation supporting the modernization project's design and planning phase.