### Huasna Valley Sound Level Assessment

Huasna Valley Weather Station
27 km southeast of SBP airport

approximate boundary of Huasna Valley
Sound Level Assessment

Ambient Noise Level is the composite of noise from all sources near and far, and is the normal or existing level of environmental noise or sound at a given location. The ambient level is typically defined by the LEQ level for a defined period of time.

Background Noise Level is the underlying, ever-present lower level noise that remains in the absence of intrusive
or intermittent sounds.  Distant sources, such as traffic, typically make up the background. The background level is generally defined by the L90 percentile noise level.

Existing Sound Level Contours, 24-hour LDN = dBA