MINOR CHANGE - Attachment 5 - Noise Impact Assessment.pdf

APPENDIX A           GLOSSARY
 Parameter or Term   Description
 dB                  The decibel (dB) is the unit measure of sound. Most noises occur in a range of 20 dB
                     (quiet rural area at night) to 120 dB (nightclub dance floor or concert).
 dBA                 Noise levels are most commonly expressed in terms of the ‘A' weighted decibel scale,
                     dBA. This scale closely approximates the response of the human ear, thus providing a
                     measure of the subjective loudness of noise and enabling the intensity of noises with
                     different frequency characteristics (e.g. pitch and tone) to be compared.
 Day                 The period between 7am and 6pm.
 Evening             The period between 6pm and 10pm.
 Night               The period between 10pm and 7am.
 Free-field          The description of a noise receiver or source location which is away from any
                     significantly reflective objects (e.g. buildings, walls).
 L1                  The noise level exceeded for 1% of the measurement period.
 L10                 The noise level exceeded for 10% of the measurement period. It is sometimes
                     referred to as the average maximum noise level.
 L90                 The noise level exceeded for 90% of the measurement period. This is commonly
                     referred to as the background noise level.
 Leq                 The equivalent continuous sound level, which is the constant sound level over a given
                     time period, which is equivalent in total sound energy to the time-varying sound level,
                     measured over the same time period.
 Leq,1hour           As for Leq except the measurement intervals are defined as 1 hour duration.
 Lmax                Maximum A-weighted sound pressure level.
                     Brisbane City Council 2014 City Plan and Moreton Bay Regional Council Noise Policy
                     additional definition:
                     Lmax assessment only applies to ‘specified noise sources’ which are defined as - (a)
                     impact noises; (b) hammering; (c) loading/unloading; (d) dropping items; (e) beepers,
                     alarms, bells, phones, sirens; (f) power tools; (g) valve releases; (h) air brakes; and (i)
                     door slamming. People noise and vehicle pass-by noise (engine, exhaust, induction,
                     tyres) are specifically excluded.
 Leq(24 hour)        The average Leq noise level over the 24-hour period from midnight to midnight.
 L10(18 hour)        The arithmetic average of the one-hour L10 values between 6am and midnight. This
                     parameter is used in the assessment of road traffic noise.
 Rw                  Weighted Sound Reduction Index – is a single number evaluation of the property of a
                     partition to attenuate sounds. For the majority of partitions, the value of Rw will be
                     similar to the value for STC. Partitions with particularly poor performance at 100 Hz
                     may have lower values for Rw than for STC. Conversely, partitions with poor
                     performance at 4000 Hz may have higher Rw than for STC. (As per AS1276.1-1999).
 Habitable Rooms     According to the "Building Code of Australia" a Habitable Room is: " a room used for
                     normal domestic activities and
                     Includes a bedroom, living room, lounge room, music room, television room, kitchen,
                     dining room, sewing room, study, playroom, family room, home theatre, and sunroom,
                     but
                     Excludes a bathroom, laundry, water closet, pantry, walk-in wardrobe, corridor,
                     hallway, lobby, photographic darkroom, clothes drying room, and other spaces of a
                     specialised nature occupied neither frequently nor for extended periods."
 Acoustic fence      Solid, gap free fence with minimum panel surface density of 12.5kg/m2.




207401.0104.R01V06                                                                                        Page 17