Ambient sound/noise

 Background noise level.

Attended monitoring

 Measuring noise using a hand held noise monitor.


Gradual loss in intensity of any kind through a medium, such as insulation (opposite of amplification). HVO fits its heavy mobile equipment with sound suppression materials such as mufflers and engine insulation. This is known as noise attenuation.

Community Consultative Committee (CCC)

HVO has a Community Consultative Committees (CCC) who meet on a regular basis. CCCs provide a forum for open discussion between mine representatives, the community, local council and other stakeholders on issues directly relating to our operations, environmental performance and community relations, and to keep the community informed on these matters. It is a condition of our mine consents to operate CCCs.  

Development Consent

Documentation granting the project approval to be undertaken including relevant operating conditions. Development consent is obtained under the Environmental Planning & Assessment Act 1979.

Decibels or dB(A)

Noise level measurement units are decibels (dB). The “A” weighting scale is used to describe human response to noise.


Follows the frequency sensitivity of the human ear at very high noise levels. The "C" weighting scale includes much more of the low-frequency range of sounds than the "A" scale.

NSW Environment Protection Authority (EPA)

Primary environmental regulator for NSW.

Environmental Planning & Assessment Act 1979 (EP&A Act 1979)

Legislation that provides a system of environmental planning assessment for NSW.

Exceedance for noise

Noise level attributed to HVO (either HVO North  or HVO South), measured during attended monitoring, which is in excess of a consent noise limit.


The average noise energy during a measurement period.


The level exceeded for 90% of the time, which is approximately the average of the minimum noise levels. The LA90 level is often referred to as the ‘background’ noise level and is commonly used to determine noise criteria for assessment purposes.

Management Controls

Actions or controls at site are taken are commensurate with the nature and severity of the noise issue.

Routine controls to manage noise and dust typically include attenuated haul trucks on high noise risk haul runs, water carts in operation throughout shift, visual inspections conducted by operators and supervisors monitoring dust.

Minor operational changes to reduce environmental impact include repositioning of a lighting plant, changing a haul route, changing the fleet type being used in an area, or reducing the amount of haul fleet being used.

Major operational changes to reduce environmental impacts include changing or closing down dump areas, shutting down heavy mining equipment, or closing a pit altogether.

Non-compliance for noise

Exceedance measured which is attributable to either HVO North or HVO South in accordance with the HVO Management Plan Protocol for determining compliance.


Particulate matter or particles less than 10 microns in diameter.

Sound Power Level

10 times the logarithm of energy radiated from a source (as noise) divided by a reference power, the reference power being 1 picowatt.


TEOM stands for 'Tapered Element Oscillating Microbalance' - A real-time air quality (particulate) monitoring device. HVO operates a network of PM10 TEOM's to measure and report on air quality conditions in surrounding community areas.


Total Suspended Particulate refers to the total of all particles suspended in the air.


Upper Hunter Air Quality Monitoring Network. Visit