Landfills
1. Sanitary landfills are disposal sites for non-hazardous solid wastes spread in layers, compacted to the smallest practical
volume, and covered by material applied at the end of each operating day. 2. Secure chemical landfills are disposal sites for hazardous waste, selected and designed to minimise the chance of release of hazardous substances into the environment.

Laser Induced Fluorescence
A method for measuring the relative amount of soil and/or groundwater with an in-situ sensor.

Leachate
Water that collects contaminants as it trickles through wastes, pesticides or fertilisers. Leaching may occur in farming areas, feedlots, and landfills, and may result in hazardous substances entering surface water, ground water, or soil.

Life Cycle of a Product
All stages of a product's development, from extraction of fuel for power to production, marketing, use, and disposal.

Lifetime Exposure
Total amount of exposure to a substance that a human would receive in a lifetime (usually assumed to be 70 years).

Light-Emitting Diode (LED)
A long-lasting illumination technology, which requires very little power.

Limit of Detection (LOD)
The minimum concentration of a substance being analysed that has a 99 percent probability of being identified.

Liquefaction
Changing a solid into a liquid.

Liquid Injection Incinerator
Commonly used system that relies on high pressure to prepare liquid wastes for incineration by breaking them up into tiny droplets to allow easier combustion.

Low NOx Burners
One of several combustion technologies used to reduce emissions of Nitrogen Oxides (NOx.).

Lower Detection Limit
The smallest signal above background noise an instrument can reliably detect.