Minimum acoustic performance is a prerequisite requirement that applies to LEED for Schools projects. The prerequisite aims to provide classrooms that facilitate better teacher-to-student and student-to-student communication through effective acoustic design. The prerequisite requires projects to meet the sound transmission class (STC) ratings for walls, floors, ceilings, doors, and windows; the background noise levels from HVAC systems; and the reverberation time for core learning spaces. By meeting the minimum acoustic performance, projects can improve the indoor environmental quality, enhance the learning outcomes, and reduce the health and stress impacts of noise. References: LEED v4 Reference Guide for Building Design and Construction, p. 545 1; [Acoustical Society of America website]

A brownfield site is appropriate for development of LEED projects because it is a site that has been previously used for industrial or commercial purposes and may be contaminated by pollutants or hazardous substances. Developing a brownfield site can help reduce environmental impacts, such as soil erosion, habitat loss, and water consumption, by reusing existing infrastructure and restoring degraded land. LEED projects can earn credits for developing on brownfield sites under the Sustainable Sites category. Reference: LEED v4 BD+C Reference Guide, Sustainable Sites, page 35; Best Management Practice #14: Alternative Water Sources1