# The Landfill (England and Wales) Regulations 2002, Paragraph 2


(1) Samples of leachate or surface water (if present) must be collected at representative points.
(2) Sampling and measuring of the volume and composition of any leachate must be performed separately at each point at which leachate is discharged from the site.
(3) Monitoring of surface water (if present) shall take place at at least two points, one upstream from the landfill and one downstream.
(4) Gas monitoring must be carried out for each section of the landfill and representative samples must be collected and analysed in accordance with Table 1.
(5) A representative sample of leachate and water shall be taken for monitoring purposes in accordance with Table 1.
TABLE 1
Operational phase
After-care phase1
Leachate volume2
Monthly1, 3
Every six months
Leachate composition2, 4
Quarterly1
Every six months
Volume and composition of surface water5
Quarterly1
Every six months
Potential gas emissions and atmospheric pressure6 (CH4, CO2, O2, H2S, H2 etc)
Monthly1, 7
Every six months8

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Source: https://www.legislation.gov.uk/ukdsi/2002/0110395905/schedule/3/paragraph/2 (the official version)
Page: https://openlegislation.uk/draft-landfill-england-and-wales-regulations-2002/schedule-3/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.