| LA90,T |
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This is the noise level in dB(A) which
during the sampling interval T, was exceeded for 90% of
the time. As with LAeq,T, the interval (e.g. 1 hour)
should be defined |
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| LAeq,1hr |
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This can be considered the 'average'
sound pressure level in dB(A)) over a 1 hour period.
This is often the measurement used in setting limits and
known as the noise equivalent level |
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LAeq,T |
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This can be considered the 'average'
sound pressure level in dB(A)) over a period of time, T.
Formally, it is that continuous sound pressure level in
dB(A) which, over time T, would have the same acoustic
energy as the measured sound |
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| LAmax,T |
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This is the maximum sound pressure
level in dB(A) over an interval of time T |
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| LAmin,T |
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This is the minimum sound pressure
level in dB(A) over an interval of time T |
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| LAN,T |
|
This is the noise level in dB(A) which
during the sampling interval T, was exceeded for N% of
the time |
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| Landbank |
|
A stock of valid planning permissions
for the winning and working of minerals. It is composed
of the sum of all permitted reserves at active and
inactive sites at a given point in time, and for a given
area to ensure continuity of production for a set number
of years |
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| LCA |
|
Life Cycle Assessment. A technique to
investigate and quantify the environmental impacts of a
product or service throughout its life |
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| LGAP |
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A local geodiversity action plan (GAP)
(q.v.) |
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| LIDAR |
|
LIDAR (Light Detection and Ranging) is
an optical remote sensing technology that measures
properties of scattered light to find range and/or other
information of a distant target |
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| Littoral
Zone |
|
The portion of a water body (e.g. ocean
or lake) extending from the shoreline to the greatest
depth occupied by rooted plants |
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| Local
Development |
|
This constitutes the lower tier of the
statutory Development Plan |
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| Local
Development Frameworks |
|
The local development framework is a
non-statutory term used to describe a folder of
documents, which includes all the local planning
authority's local development documents (comprised of
development plan documents, which will form part of the
statutory development plan, and supplementary planning
documents). The local development framework will also
comprise the statement of community involvement, the
local development scheme and the annual monitoring
report |
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| Logistics |
|
Managing the flow of goods, information
and other resources between the point of origin and the
point of consumption including packaging, storage and
transportation |
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| Long-term
management |
|
For minerals sites - land management of
a site (beyond the aftercare period) to ensure
maintenance of a high-quality end-use |
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| Low
permeability barrier |
|
A body/vertical wall of low
permeability material installed in the ground to
restrict groundwater flow. Such barriers may be used to
restrict the flow of groundwater into the cone of
depression created by dewatering, thereby limiting the
extent of the zone of influence. For this purpose,
adequate barriers can often be constructed using locally
available materials (e.g. clay from strata encountered
beneath the mineral or from overburden material, if that
is sufficiently cohesive). In other cases, especially
where there is a need to exert greater control (e.g. to
contain contaminated groundwater) it may be necessary to
use imported lower permeability clays, bentonite slurry
and/or a suitable geomembrane |
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| LWA |
|
This is the Sound Power Level (SWL)
rating for a particular piece of equipment or plant,
which can be used o predict Sound Pressure Levels (SPLs)
at given distances |
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